Posts about: "Traffic in Sight" [Posts: 72 Page: 1 of 4]ΒΆ

Junkflyer
January 30, 2025, 07:31:00 GMT
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Post: 11816952
Obviously way too soon for a definitive answer, however the Helo calling the traffic in sight may have been the first or second hole in the cheese.

Subjects Traffic in Sight

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Upside Down
January 30, 2025, 10:22:00 GMT
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Post: 11817092
Originally Posted by Junkflyer
Obviously way too soon for a definitive answer, however the Helo calling the traffic in sight may have been the first or second hole in the cheese.
wrong traffic ?
Or could the circling approach from 01 to 33 also be a factor with the helo misinterpreting the CRJ flight path and somehow losing sight ? The track of both aircraft is interesting\x85 helo seems to initially be parallel to the river bank and turns 40 right. Why ? Was their destination the same airport or was that manoeuvre related to traffic avoidance or loss of visual ?

All guesswork I know\x85 putting Special VFR traffic so close to final approach traffic at night clearly a problem. Tragic.

Subjects CRJ  Circle to Land (Deviate to RWY 33)  Traffic in Sight  VFR

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Stringy
January 30, 2025, 10:42:00 GMT
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Post: 11817113
Originally Posted by 172_driver
I used to enjoy the free use of airspace in the US, but I always told myself and others; It's not for anyone who under performs.
That's an indirect way of saying that the system is flawed and is relying too much on humans to stop it from failing.
Originally Posted by EDLB
So a midair in the most tightly restricted and controlled airspace in the world. How many official agents were watching this in real time without taking action?
The problem is an over reliance on visual separation in congested and complicated airspace. An aircraft claims it has the traffic in sight, therefore taking responsibility for separation, and ATC moves on to their next task. The fact that this is allowed with commercial aviation over DC (or any major US city) when there's potentially hundreds of lives at stake in the air, never mind the lives on the ground, is staggering.

Subjects ATC  Separation (ALL)  Traffic in Sight  Visual Separation

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Capt Fathom
January 30, 2025, 10:56:00 GMT
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Post: 11817122
Originally Posted by Stringy
The problem is an over reliance on visual separation in congested and complicated airspace. An aircraft claims it has the traffic in sight, therefore taking responsibility for separation, and ATC moves on to their next task.
I remember the Lufthansa A380? that refused a night visual approach into SFO and subsequently diverted to Oakland.

Subjects ATC  Separation (ALL)  Traffic in Sight  Visual Separation

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Locked door
January 30, 2025, 11:39:00 GMT
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Post: 11817145
The whole USA aviation sector needs root and branch reform, there have been so many near misses in recent years that this accident was inevitable, it was just a question of when.

The majority of people inside the system don\x92t realise how bad it is because it\x92s all they\x92ve ever known. We have American contributors here who routinely tell us it\x92s ok to switch to TA only to avoid \x93nuisance\x94 RA\x92s, who will not follow an RA as they have the traffic in sight, who will accept visual separation at night (day is bad enough) or very late visual switches, who think LAHSO is a good idea. USA ATC think it\x92s acceptable to \x93slam dunk\x94 a heavy jet, get shirty when foreign operators refuse a questionable clearance, literally forget about an aircraft once it has accepted visual separation. The system allows uncontrolled VFR traffic within 500ft of commercial operations which is madness.

I operated the 747-400 around the planet for over a decade, the USA was one of the most threat laden environments we went to. Lovely people, just insane procedures. In that time I experienced a TCAS RA on vectors to JFK, was sent around and put in the hold as punishment on short final in Miami for refusing LAHSO, had multiple super high workload approaches to SFO combined with the crazy policy of pairing aircraft on approach. I witnessed a Singapore aircraft being refused a diversion to Boston from JFK fifteen minutes after they stated what time they would be leaving the hold and where they would be going resulting in a fuel mayday and an unplanned diversion to a regional airport. I lost count of the times I was chastised for refusing a visual approach and visual separation in congested airspace or a very late visual switch.

On most of the planet the human is the last line of defence in a multi layered safety environment. In the USA the human is often the only line of defence, while the environment they are in is super high workload significantly reducing their capacity to trap safety issues.

Unless there is a marked attitude shift in all parties involved in aviation in the USA this will happen again, potentially quite soon.

Stay safe out there

LD

Subjects ATC  Close Calls  Land and Hold Short  Separation (ALL)  TCAS (All)  TCAS RA  Traffic in Sight  VFR  Visual Separation

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Upside Down
January 30, 2025, 13:08:00 GMT
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Post: 11817221
Originally Posted by Tu.114
I am rather surprised by the route the helicopter took, this looks like quite a high risk in itself.

Yes, there is noise abatement and all that, but is there a compelling reason beyond that why the heli had to track the river in opposite direction to the flow of arriving airliners? Certainly, it would have been possible for a controller, radar-equipped or not, to hold the heli east of the field and clear him for a midfield crossing on heading 270 or so as an airliner is just touching down on 33 or 01 and the next one is still a few miles out? That would have kept him well out of the approach sector, allowed for a possible go-around of an arriving airliner and also would not interfere with departing traffic.

Surely, someone familiar with DCA can explain...
Im not \x93familiar with DCA\x94 but from the Terminal Chart & discussion here it\x92s clear that the heli was following the transit route 4, which would be a normal activity. Though it\x92s also possible their plan was to leave route 4 & cross the river towards the airfield\x85.

I would expect the airliner not to have to take any avoiding action, as it\x92d be IFR on a standard arrival for RW33. I would expect ATC to inform them of the helicopter traffic below them on the east side of the river.
I would expect the helicopter traffic to ultimately be responsible for avoidance, and they\x92d I guess be flying \x91Special VFR\x92*. But as they\x92re in controlled airspace then they should have been warned (which apparently they were) about the arriving civil traffic.

If the helicopter was, indeed, following Route 4 then what led to the discrepancy in position & height is conjecture. Also why they confirmed traffic in sight yet still collided is conjecture (& It\x92s possible they had their own emergency)


*) does \x91Special VFR\x92 exist/ apply for \x91night VMC\x92 ops in US controlled airspace ? it\x92s a long time since my FAA/US flying days\x85\x85


Subjects ATC  DCA  IFR  Route 4  Traffic in Sight

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Jojobray
January 30, 2025, 13:16:00 GMT
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Post: 11817227
Poignant truth

Originally Posted by Locked door
The whole USA aviation sector needs root and branch reform, there have been so many near misses in recent years that this accident was inevitable, it was just a question of when.

The majority of people inside the system don\x92t realise how bad it is because it\x92s all they\x92ve ever known. We have American contributors here who routinely tell us it\x92s ok to switch to TA only to avoid \x93nuisance\x94 RA\x92s, who will not follow an RA as they have the traffic in sight, who will accept visual separation at night (day is bad enough) or very late visual switches, who think LAHSO is a good idea. USA ATC think it\x92s acceptable to \x93slam dunk\x94 a heavy jet, get shirty when foreign operators refuse a questionable clearance, literally forget about an aircraft once it has accepted visual separation. The system allows uncontrolled VFR traffic within 500ft of commercial operations which is madness.

I operated the 747-400 around the planet for over a decade, the USA was one of the most threat laden environments we went to. Lovely people, just insane procedures. In that time I experienced a TCAS RA on vectors to JFK, was sent around and put in the hold as punishment on short final in Miami for refusing LAHSO, had multiple super high workload approaches to SFO combined with the crazy policy of pairing aircraft on approach. I witnessed a Singapore aircraft being refused a diversion to Boston from JFK fifteen minutes after they stated what time they would be leaving the hold and where they would be going resulting in a fuel mayday and an unplanned diversion to a regional airport. I lost count of the times I was chastised for refusing a visual approach and visual separation in congested airspace or a very late visual switch.

On most of the planet the human is the last line of defence in a multi layered safety environment. In the USA the human is often the only line of defence, while the environment they are in is super high workload significantly reducing their capacity to trap safety issues.

Unless there is a marked attitude shift in all parties involved in aviation in the USA this will happen again, potentially quite soon.

Stay safe out there

LD
Sadly this is probably the most honest and accurate description of flying into the USA I\x92ve read in many years.

Subjects ATC  Close Calls  Land and Hold Short  Separation (ALL)  TCAS (All)  TCAS RA  Traffic in Sight  VFR  Visual Separation

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island_airphoto
January 30, 2025, 13:23:00 GMT
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Post: 11817231
Originally Posted by Upside Down
Im not \x93familiar with DCA\x94 but from the Terminal Chart & discussion here it\x92s clear that the heli was following the transit route 4, which would be a normal activity. Though it\x92s also possible their plan was to leave route 4 & cross the river towards the airfield\x85.

I would expect the airliner not to have to take any avoiding action, as it\x92d be IFR on a standard arrival for RW33. I would expect ATC to inform them of the helicopter traffic below them on the east side of the river.
I would expect the helicopter traffic to ultimately be responsible for avoidance, and they\x92d I guess be flying \x91Special VFR\x92*. But as they\x92re in controlled airspace then they should have been warned (which apparently they were) about the arriving civil traffic.

If the helicopter was, indeed, following Route 4 then what led to the discrepancy in position & height is conjecture. Also why they confirmed traffic in sight yet still collided is conjecture (& It\x92s possible they had their own emergency)


*) does \x91Special VFR\x92 exist/ apply for \x91night VMC\x92 ops in US controlled airspace ? it\x92s a long time since my FAA/US flying days\x85\x85
I have flown into DCA many times at night and there was no special VFR, it was either IFR or VFR. The weather was clear, no one would have been calling for special VFR anyway.

Subjects ATC  DCA  IFR  Route 4  Traffic in Sight  VFR

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DonLeslie
January 30, 2025, 13:44:00 GMT
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Post: 11817254
Originally Posted by nicolai
Neither Lufty nor Iberia will accept a visual night approach (as far as I recall).

But that wouldn't have saved them here, since they'd still have been hit by someone else trying visual separation at night in this case.

The Lufty A380 that went to Oakland looked a lot like they were being sent there by ATC to punish them, since it can't have been news to the SFO controllers that Lufty won't do that approach - when they come there every night at about the same time. The ATC kept him waiting and the Lufty Captain was pretty arsey to the ATC and then they sent him to Purgatory (OAK).



In the San Francisco case (it was an A350, BTW), there was a misunderstanding. Lufthansa are and have always been allowed to do visual approaches at night. At the time, however, they were not allowed to "follow visually behind" at night, that restriction has since been lifted.
Personally however, an LH A350 Captain myself, I would never do it at any airport that I'm not 100% familiar with. Take the Bay Area for example: there are millions of lights, from buildings, street lights, cars and other aircraft. One of the latter may or may not be your traffic, but can you be sure which one is the one? Or judge the distance from your own aircraft correctly? If ATC ask me whether I have traffic in sight, my answer is always "negative".
That American practice is inherently dangerous and, as many of my European colleagues have commented here, it is beyond me how that can be legal.



​​​​​​​



Subjects ATC  Separation (ALL)  Traffic in Sight  Visual Separation

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MLHeliwrench
January 30, 2025, 14:36:00 GMT
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Post: 11817284
Blackhawk comms

Some of the ATC recordings and YouTube videos don\x92t show the Blackhawk responding to ATC instructions. The Blackhawk does acknowledge more than once they have the traffic in sight - just on a different frequency, likly UHF which commercial planes do not use generally.

It\x92s easy to look now and be like - who would allow a helicopter highway 300 feet below a final approach path????

but this has been completely routine in that area for years and years. Helicopter Pilots who have flown the route have felt wake turbulence when scooting under/behind.

also - the use of 33, especially by CRJ size jets is completely normal and should of been expected by any helicopter crew as a possible traffic issue. In the VAS channel ATC video linked above. There are other jets using 33.

Subjects ATC  Blackhawk (H-60)  CRJ  Traffic in Sight

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canyonblue737
January 30, 2025, 14:44:00 GMT
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Post: 11817292
Originally Posted by SINGAPURCANAC
Shouldnt it be:
Pat 25 traffic at 11 o clock 3 miles, crj following ils for rwy 33, report in sight
??
yes. if you look at the longer transcripts his initial call of the traffic was exactly that format and the helicopter acknowledges the traffic in sight and is approved visual separation. they some time later 30-60 seconds at least (maybe more) there are the more common published transcripts where the controller uses non standard phraseology in quick succession to attempt to point out and ask he helicopter to pass behind the traffic. the non-standard phraseology and voice is clearly stressed because its the moment in time the ATC controller becomes first concerned by the proximity of the helicopter and airplane and clearly he is making a quick call to try to see if the helicopter still "has him in sight" or if he needs to take action (like sending the CRJ around). unfortunately after the second quick non standard call the helicopter again responds they have the traffic in sight and will maintain visual separation. perhaps 10-15 seconds later the midair occurs. detailed audio long before and after the incident is here:

Subjects ATC  CRJ  Pass Behind  Pass Behind (All)  Phraseology (ATC)  Separation (ALL)  Traffic in Sight  Visual Separation

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ALTSELGREEN
January 30, 2025, 15:12:00 GMT
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Post: 11817313
Originally Posted by Locked door
The whole USA aviation sector needs root and branch reform, there have been so many near misses in recent years that this accident was inevitable, it was just a question of when.

The majority of people inside the system don\x92t realise how bad it is because it\x92s all they\x92ve ever known. We have American contributors here who routinely tell us it\x92s ok to switch to TA only to avoid \x93nuisance\x94 RA\x92s, who will not follow an RA as they have the traffic in sight, who will accept visual separation at night (day is bad enough) or very late visual switches, who think LAHSO is a good idea. USA ATC think it\x92s acceptable to \x93slam dunk\x94 a heavy jet, get shirty when foreign operators refuse a questionable clearance, literally forget about an aircraft once it has accepted visual separation. The system allows uncontrolled VFR traffic within 500ft of commercial operations which is madness.

I operated the 747-400 around the planet for over a decade, the USA was one of the most threat laden environments we went to. Lovely people, just insane procedures. In that time I experienced a TCAS RA on vectors to JFK, was sent around and put in the hold as punishment on short final in Miami for refusing LAHSO, had multiple super high workload approaches to SFO combined with the crazy policy of pairing aircraft on approach. I witnessed a Singapore aircraft being refused a diversion to Boston from JFK fifteen minutes after they stated what time they would be leaving the hold and where they would be going resulting in a fuel mayday and an unplanned diversion to a regional airport. I lost count of the times I was chastised for refusing a visual approach and visual separation in congested airspace or a very late visual switch.

On most of the planet the human is the last line of defence in a multi layered safety environment. In the USA the human is often the only line of defence, while the environment they are in is super high workload significantly reducing their capacity to trap safety issues.

Unless there is a marked attitude shift in all parties involved in aviation in the USA this will happen again, potentially quite soon.

Stay safe out there

LD
What a terrible, avoidable accident brought about by woefully inadequate procedures.
Couldn\x92t agree more with everything you say. I\x92m sure we have probably shared a flightdeck in years gone by judging by your experiences. It\x92s this kind of chaos that I have to say I miss very little!!

Subjects ATC  Close Calls  Land and Hold Short  Separation (ALL)  TCAS (All)  TCAS RA  Traffic in Sight  VFR  Visual Separation

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Easy Street
January 31, 2025, 00:34:00 GMT
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Post: 11817798
Originally Posted by jumpseater
I am wondering the same thing, in the UK/EU unless the IFR crew specifically cancels their IFR plan with ATC, (it can be done immediately on frequency), IFR separation requirements still apply.

In the US does an agreement to make a visual approach regardless of airspace classification, cancel IFR separation requirements for the ATCO?

No, a visual approach started under IFR remains under IFR unless IFR is explicitly cancelled.

However, note that the airspace class at major US airports is B (rarely used elsewhere). Cancelling IFR in Class B does not relieve ATC of separation responsibility because VFR flights must still be separated from all other flights ( VFR separation standards here ). Separation responsibility only transfers to a pilot when they accept ' visual separation ' and the controller must continue giving separation instructions until that point. Aircraft can be given 'visual separation' against other aircraft, including IFR aircraft as happened here, without the other aircraft needing to have the traffic in sight. The controller must advise the other aircraft that visual separation is being applied if the flight paths are converging .

None of that is necessarily a problem.

The problem is reliance on visual separation at night. The ease with which the eye is drawn to bright lights (which may not be the lights of interest) and inability to perceive depth and distance from a point source of light (made worse by NVG) make it a high risk activity even between combat aircraft. To permit it to be relied upon for protection of airline traffic is madness.






Last edited by Easy Street; 31st January 2025 at 01:14 .

Subjects ATC  ATCO  IFR  Night Vision Goggles (NVG)  Separation (ALL)  Traffic in Sight  VFR  Visual Separation

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xetroV
January 31, 2025, 11:08:00 GMT
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Post: 11818111
Originally Posted by Prob30Tempo TSRA
Is there any audio suggesting the heli acknowledged the instruction to pass behind ?
This version of the Vasaviation video includes the heli R/T.

At 00:26 ATC informs them about the CRJ, and PAT25 requests visual separation. At 01:08 the conflict alert sounds and ATC instructs them to pass behind. This is not read back; instead PAT25 affirms they have the traffic in sight and asks again for visual separation. ATC seems to approve this request for the second time, but this transmission is not very clear.

Subjects ATC  CRJ  PAT25  Pass Behind  Pass Behind (All)  Separation (ALL)  Traffic in Sight  Visual Separation

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NIBEX2A
January 31, 2025, 14:47:00 GMT
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Post: 11818263
Interestingly, if the SMS works in the US the same as everywhere else in the world, procedures should be audited on a regular basis, with a focus on any changes which may have invalidated the original assumptions made about the frequency of hazards and associated risks. These procedure reviews would also take place after receipt of any safety reports where the procedure could have been a contributing factor.

The NASA ASRS database contains safety reports raised over the US. A quick search with the term “helicopter” produced 40+ reports with the highlights shown below.. (apologies, to save time these are all copy and pasted) There are more, but I appreciate that most of us have annual eye examinations to pass so didn’t want to overdo it!

1. While we were flying the river visual to Runway 19 into DCA we received a TCAS alert. We were around SETOC or just past it and fully configured to land. There was, what I could only guess as I never saw it, a helicopter about 300ft below us. The TCAS showed it climbing but at a very very slow rate as it never showed closer than 300ft to us. When we flew over top of it, we got a “monitor vertical speed alert from TCAS which we then pitched into the green arc on the VSI which was -300fpm or greater. After we received the “clear of conflict” the FO corrected and got back on glide path. I assessed that we were still within stable approach criteria and we continued the approach and landed in DCA without further issue. We never received a warning of the traffic from ATC so we were unaware it was there. Suggestion: Need to have better separation for DCA traffic on the river visual to the helicopter traffic that is flying up and down the river. Maybe by timing the separation of when we began the approach to where that traffic will be when we cross overhead.

2.
ATC delayed switch from Approach to Tower led to TA and resulting altitude deviation causing a GPWS Caution. Tower then issued a low altitude alert. Helicopter traffic was heading up the Potomac while we were on the river visual approach did not alert us to the on coming traffic. By the time Tower responded we had a RA to descend which led to a GPWS and low altitude alert from Tower. We confirmed traffic in sight and maneuvered back on coarse to correct the deviation, in judgement the safety of flight was not compromised as such we continued the approach to landing on Runway 19. As I believe a go-around would have exacerbated the situation and led to further problems.

3.
I was working the Local and Helicopter positions combined at DCA ATC. I have been CPC/FPL for [a short time].

I accepted a handoff from Potomac TRACON on Aircraft X 2 miles west of ZZZ. Aircraft X contacted DCA Tower and requested to fly Route 1-Route 4 -ZZZ1 and then to ZZZ2. I radar contacted Aircraft X, approved the request and issued the altimeter.

Aircraft Y called on a seven mile final to DCA and requested to land on Runway XX. I then I cleared Aircraft Y to land.

Note. My standard practice for helicopter s flying the DCA helicopter route is to issue any pertinent landing traffic by the time the helicopter s pass over the South Capitol Street Bridge.

Aircraft X asked if I had issued traffic on the aircraft landing Runway XX. I thought I had applied my standard practice of issuing traffic to the helicopter s over the bridge so I informed Aircraft X that I had issued the traffic.

Once Aircraft Y landed, he asked about the flight of three helicopter s off his right. I informed him I had issued traffic to Aircraft X.

Neither aircraft declared a near miss on frequency. At all times I had maintained Tower applied visual separation between Aircraft X and Aircraft Y.

I recommend recurrent helicopter training for the facility to prevent this incident from occurring in the future with other controllers.

4


Our flight] into DCA was in a NMAC. We were supposed to circle from the visual Runway 1 to instead land on 33. We followed the [company] station bulletin procedures exactly as planned and came within very close contact of another aircraft. This occurred about 400 feet off the ground to the point where the pilot monitoring had to take the controls to make a correction in order to prevent it from becoming a midair collision. After there was action taken to make a correction from the close call, we were then informed by DCA tower of close traffic although at that point it would have been too late. I have flown with people who for the purpose of having a better chance of a stabilized approach would have had a wider circle to land procedure which I'm sure would have almost definitely ended in the collision of two aircraft over the turn to final for 33 in DCA. There was an extreme lack of communication between DCA Tower to [our flight] or DCA Tower to the associated helicopter who did not ever pop up on TCAS which I'm assuming is due to a lack of an operating transponder. No TCAS RA was associated with this event.

This occurred due to an extreme lack of communication between DCA Tower and [our flight] or DCA Tower and the associated helicopter . Otherwise the other reason this may have happened is because of an unclear idea of where aircraft should be located during Runway 33 circle to land operations. I believe I was on track with what the [company] guidelines are for that particular procedure but there is a possibility that the other traffic operating around that area may not be aware of where exactly we are located or maybe they don't have a specific guideline to keep the arriving traffic separated from the low flying helicopter s.

5

I understand DCA is a busy airport, I was based there for years. The military low level helicopter traffic that routinely is in the DCA traffic area complicates matters. But this is probably the most dangerous airport in the United States, strictly based on the the fact the controllers are pushing, pushing, pushing, in an attempt to handle the traffic they have.

6


We were cleared to circle to and land on runway 33. ATC also added that there was a low level helicopter and that the helicopter had us in
sight. At the Wilson bridge we turned to the northeast to set ourselves up for a landing on runway 33. We continued normally and started our turn to final.

when I saw an opposite direction helicopter very close to our altitude, but slightly below us and climbing. I was about to initiate the go around
regardless of the TCAS when we got the RA. As we started the go around I saw the helicopter make an aggressive descent. We were given a
turn to the east and a climb to 2,000 feet which we complied with. After that, we cleaned up the plane, setup for another approach, and landed
on runway 1 without incident. Once we cleared the runway, ground control asked me if I wanted to call the DCA tower supervisor for an
explanation of what happened. I gladly accepted. The tower supervisor I spoke with told me a few things that explained what may have
happened. Number one, he said that the helicopter s operating in that area should NEVER be above 200 feet. According to him, the helicopter
was at 800 feet, clearly not where he was supposed to be. He also explained that ATC may have taken their eyes off the helicopter for a
second because they would never expect those helicopter s to do something that egregious. That seems plausible given the fact that I've
never seen a helicopter in that area at that altitude. He suggested that it was most probably a deviation on the part of the Pilot of the
helicopter , and a loss of aircraft separation that was also the fault of the helicopter pilot.

Helicopter pilots in and around DCA should adhere to ATC instructions.

7


It was the end of a long day and the events were happening very quickly during a high workload portion of the flight. As all pilots know, the River Visual is a very demanding approach during the best of circumstances. It is very labor intensive when done at night during periods of high traffic volume. The advertised approach in use at DCA was the LDA 19 with VASI being out of service. During the initial approach, Potomac asked if we would accept the charted River Visual approach (VASI back working) and we did. At approximately the 7 DME point we were in the end process of configuring the airplane for landing and the First Officer was accomplishing the Landing Checklist. The radio chatter was considerable and the Tower at some point advised us of helicopter traffic ahead and to the left (I believe he said 10 to 11 o'clock) and he was going to pass from left to right, below us and he "HAS US IN SIGHT." It has to be noted that these traffic calls and helicopter s have unfortunately become background noise. There are always numerous military and government helicopter s running up and down that river at all times of the day and night. Because of this, what would normally be alarming at any other airport in the country has become commonplace at DCA. The FAA allows these aircraft to operate in this environment and we have no choice, but to accept it and deal with it. Therefore, the helicopter s being very close are not out of the norm. As you can imagine, I was concentrating on the approach and doing the required gyrations to stay over the river and not violate the White House prohibited airspace, and to keep the aircraft on the proper vertical profile. The Runway 19 visual was loaded in the FMGC and I was using it as a backup to my eyes. I was 'dead on' the donut and everything looked normal. I was at or very slightly above the recommended altitudes at each DME point. As I was approaching 4 DME, I caught a glimpse of the helicopter out of my left window and he did look higher than I expected to see him. I asked the First Officer to confirm if he was going to cross from north to south. He confirmed, however I directed him to ask the Tower and confirm it with them because it did not look right. The First Officer could not get a word in with the Tower. It was at that point, we got a TCAS "TRAFFIC" call. Again, this is not out of the 'norm' for DCA. I was getting ready to take possible evasive action because it was getting uncomfortable; all this while trying to fly the demanding profile. Within seconds, we got a TCAS alert, "MONITOR VERTICAL SPEED." I complied with the TCAS alert and was thinking of going around but it all happened so very quickly that the point was moot. The helicopter passed 200 FT (MAX) below us. We were at 900 FT, slightly above the path. The Tower never called out the traffic beyond the first notification. The landing was uneventful. Due to the workload, we asked the Ground Controller for the Tower number and I called when I got to my vehicle. I called the Tower and spoke with the Controller in charge. At first it was it was obvious he was somewhat on the defensive and I had to press the point and ask very specific questions about the standard helicopter operations in the area. After some prodding, he admitted that it was a military helicopter flying from/to Ft. Meade and that he was at 700 FT and was "a little higher than normal." I asked what altitude was he supposed to be at and he replied, "three to four hundred feet." In addition, he did admit that the Tower version of collision avoidance did go to alarm but before they had a chance to react, the event was over. I cannot imagine what business is so pressing that these helicopter s are allowed to cross the path of airliners carrying hundreds of people! I do not understand why they are not crossed IN-BETWEEN arrivals. They have at least 4 miles between these arriving aircraft and it seems that would be more prudent.

8


We were on the Mount Vernon Visual Approach to Washington National Airport, and the Tower instructed us to circle to land on Runway 33. While we made our approach to Runway 33, Tower advised a helicopter was maneuvering at our 12 o'clock position. As we continued our approach, Tower instructed the helicopter to "make a right 360 for a jet on a 2 mile final for Runway 33, and to report him in sight" (referring to our aircraft.)

The Tower then asked the helicopter if he had us in sight. He replied "yes", and the Tower told him to maintain visual separation. As we began our turn from base to final, the helicopter made what looked like a right turn directly into our flight path. The Captain, the pilot flying, made a hard right turn and executed a missed approach to avoid a collision. I'm not sure how close we came to the helicopter since it was on the left side of the aircraft, but I would guess it was only a few hundred feet.

9

WE WERE EXECUTING AN ILS IN IMC. AS MY FO ANNOUNCED 'APCHING MINIMUMS, RWY IN SIGHT,' I BEGAN MY TRANSITION FROM FLT DIRECTOR REF TO VISUAL REF FOR A HAND FLOWN LNDG. MY AIRSPD WAS PROBABLY AROUND 130-135 KIAS. AS I WAS TRANSITIONING I SUDDENLY SAW A DARK COLORED MIL HELI ON MY APCH PATH. HE BLENDED IN VISUALLY WITH THE DISMAL WX CONDITIONS. I DID NOT NOTICE ANY ACFT LIGHTING. AS I SAW HIM, SO DID THE DCA TWR CTLR. THE CTLR ISSUED AN IMMEDIATE AND FORCEFUL ATC INSTRUCTION TO THE HELI. THE HELI EXECUTED AN ABRUPT EVASIVE MANEUVER AND DISAPPEARED INTO THE FOG. I LANDED SAFELY. THIS ENTIRE EVENT LASTED ABOUT 3-4 SECONDS. MY ACFT (BOEING 757) CONFIGN WAS GEAR DOWN, FULL 30 DEG FLAPS, ON SPD, ON COURSE, ON GLIDE PATH. EVASIVE MANEUVERING CAPABILITY IS LIMITED UNDER THESE CIRCUMSTANCES. MY ALT WAS ABOUT 300-400 FT ABOVE THE POTOMAC RIVER. ARPT TERMINALS AND CTL TWR WERE TO MY L, PROHIBITED AREA P-56 WAS TO MY R, AND THE HELI IN QUESTION WAS IN THE WX IN FRONT OF ME SOMEWHERE. I DIDN'T FEEL I COULD EXECUTE A MISSED APCH WITH THAT ACFT IN THE FOG IN FRONT OF ME. WE WERE STILL ON LNDG PROFILE AND I DECIDED LNDG WAS THE SAFEST COURSE AVAILABLE. WE MADE A NORMAL EXIT FROM THE RWY TO THE L WITH MUCH LNDG ROOM LEFT ON RWY 36. TAXIED TO THE GATE AND PARKED. MADE AN IMMEDIATE PHONE CALL TO THE TWR SUPVR AND RPTED THE INCIDENT. THEN CALLED MY AIRLINE FLT MGMNT SUPVRS AND RPTED THE INCIDENT AND MADE A WRITTEN RPT TO THE AIRLINE SAFETY DEPT UPON ARR AT MY BASE THAT NIGHT. I AM GLAD THE VISIBILITY WAS GOOD ENOUGH FOR THE CTLR TO SEE THE HELI IN TIME TO TAKE ACTION. IF THE VISIBILITY HAD BEEN ANY LESS HE WOULDN'T HAVE. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATES THAT DURING HIS SPEAKING WITH THE TWR FACILITY AT DCA, A CTLR IN TRAINING WAS HANDLING THE MIL TFC AT THE N END OF THE ARPT UNDER THE JURISDICTION OF ANOTHER, MORE EXPERIENCED, CTLR. THE SECOND CTLR IS THE ONE THAT TOOK OVER THE MIKE AND ORDERED THE HELI TO LEAVE THE APCH ENVIRONMENT OF THE LNDG TFC. THE RPTR STATES THAT HIS TRAINING WOULD NORMALLY CAUSE HIM TO EXECUTE A MISSED APCH BUT THAT THE POSSIBILITY OF ANOTHER ENCOUNTER WITH THE SAME ACFT SEEMED LIKE A GOOD POSSIBILITY AND SO DECIDED THAT LNDG WAS THE SAFEST PATH TO FOLLOW. HE SAID THAT THE PHONE CONVERSATION REVEALED THAT EXTENSIVE TRAINING FOR A MIL EXERCISE OR OP WAS IN PROGRESS AND WAS BEING STAGED FROM THE N PART OF THE DCA COMPLEX. THE RPTR DOESN'T KNOW WHETHER THE HELI PLT MISUNDERSTOOD HIS INSTRUCTIONS OR WHETHER THE CTLR ISSUED SUCH INSTRUCTIONS IN THE FIRST PLACE.

10
WE WERE ON THE RIVER VISUAL APCH TO RWY 18 AT DCA. THERE WAS A MIL HELI OPERATING A TRAINING FLT FLYING N TO S OVER THE RIVER AT 500 FT MSL. WE APPEARED TO BE AT LEAST 80 KTS FASTER (WHILE IN OUR LNDG CONFIGN) THAN THE HELI. TWR ADVISED US OF THE HELI AND THAT HE HAD US IN SIGHT AND HE WOULD MAINTAIN VISUAL SEPARATION WITH US. WE OVERTOOK ALMOST DIRECTLY ABOVE THE HELI AT ABOUT 3.5 DME AND 1100 FT MSL, RIGHT AT THE TURN IN THE RIVER THAT IS REQUIRED ON THE APCH. WE RECEIVED AN RA FROM OUR TCASII AT 1100 FT. WE FLEW AS FAR TO THE E SIDE OF THE RIVER AS WE COULD TO MAINTAIN VISUAL ON THE HELI ON THE W SIDE OF THE RIVER. WINDS WERE OUT OF THE SW AT 15-20 KTS. THE TCASII INDICATED CLR OF CONFLICT. WE STARTED TO DSND AGAIN AND AT 900 FT AGL, RECEIVED ANOTHER RA FROM OUR TCASII. AT THAT POINT IN THE APCH, THE RIVER TURNED BACK TO THE SSW. AS WE MADE OUR R TURN WE REGAINED VISUAL WITH THE HELI AND CONTINUED TO DSND. TCASII GAVE US 'CLR OF CONFLICT' AND WE FINISHED THE APCH AND LANDED. AFTER LNDG, I CALLED THE TWR SUPVR AND HE LISTENED AND SAID THIS WAS NORMAL. I HAVE FLOWN THIS APCH AT LEAST 15 TIMES AND I AM VERY FAMILIAR WITH THIS APCH. HOWEVER, I CONSIDERED THIS APCH PUSHING THE ENVELOPE FOR SAFETY, WITH THE AMOUNT OF ATTN I HAD TO GIVE TO THE HELI WHILE FOLLOWING THE RIVER AND DSNDING IN A XWIND AND AT A HIGH LNDG WT. THE TWR NEVER MADE IT CLR TO US WHERE THE HELI WAS GOING. ON THE PHONE THE SUPVR SAID THEY TRAIN FLYING N TO S AND BACK AT 500 FT. APPARENTLY, THEY DO THIS FROM 2 DME N TO 10 DME, BASICALLY UNDER THE WHOLE APCH. WHY CAN'T THEY DO THIS AFTER 10 O'CLOCK PM OR DURING LOW TFC FLOW PERIODS? AT THE VERY LEAST, THE ACFT SHOULD BE SPACED BETTER SO AS NOT TO FLY SO CLOSE TO THE HELI WHILE ON THE APCH. I HAVE ENCOUNTERED HELIS PREVIOUSLY WHILE SHOOTING THIS APCH, HOWEVER, THEY WERE ALWAYS CLOSER IN SPD TO US AND THEREFORE WE WOULD NOT OVERTAKE THEM AS FAST, OR WE WERE SPACED BETTER. ALSO, THEY ALWAYS HAD A DEST THAT WE WERE ADVISED OF. I'M SENDING IN THIS RPT BECAUSE I WAS NOT COMFORTABLE WITH THE LEVEL OF SAFETY INVOLVED WITH FLYING WITHIN 400 FT VERTLY OF A HELI AND THAT IS CONSIDERED A NORMAL OP.
11
DURING ILS APCH, SBOUND, HELI COMING DOWN POTOMAC RIVER ABOUT 500 FT MSL, TFC CALLED BY TWR, WE DIDN'T SEE IT. WE GOT AN RA ON TCASII -- HAD TO FOLLOW RA INSTRUCTIONS. THEN WE WERE HIGH ABOVE GS, HAD TO DSND MORE RAPIDLY THAN WE WANTED TO IN ORDER TO LAND. THIS HELI CONFLICT AROUND DCA IS A DAILY PROB! GOING TO TA ONLY ON TCASII WOULD DEFEAT PURPOSE OF TCASII. LNDG ACFT SHOULD NOT HAVE TO ACCOMMODATE HELI'S. THIS IS AN ACCIDENT WAITING TO HAPPEN.

12

I WAS TURNING FINAL FOR STOL LNDG RWY 21 DCA. I SAW A HELI APCHING ON CONFLICTING FLT PATH. IT WAS APPROX 400 FT BELOW US, BUT WE WERE DSNDING FOR LNDG. I ADVISED DCA TWR OF TFC. HE SAID 'TFC LOW LEVEL, 200 FT.' JUST AS I WAS GOING TO MANEUVER TO AVOID, THE CHOPPER MADE A STEEP TURN AWAY FROM US. AT THIS POINT WE WERE WITHIN 100 FT VERTICALLY AND 1000 FT HORIZLY. BECAUSE OF THE LIMITATIONS ON PERFORMING A STOL LNDG AT DCA, MY TURN TO AVOID HIM WOULD ALSO CAUSE A GAR. TWR HAD PUT US ON RWY 21 WHILE THE ARPT WAS IN A 'N' OP (ALL OTHER TFC LNDG ON RWY 36). I RECEIVED NO WARNING FROM TWR OF HELI TFC AND I HAD NO WAY OF KNOWING IF CHOPPER PLT HAD US IN SIGHT (UNTIL HE MADE THE EVASIVE TURN). THIS IS BY NO MEANS THE FIRST TIME OF SUCH AN OCCURRENCE AT DCA. I HAVE HAD MANY CONFLICTS WITH CHOPPERS, BOTH ON LNDG AND TKOF AT DCA. I HAVE TALKED TO TWR SEVERAL TIMES (INCLUDING THIS TIME) AND HAVE RECEIVED APOLOGIES AND ADMITTING OF ERRORS BUT THE PROB CONTINUES. THE HELI IS A VERY MANEUVERABLE ACFT. IF THE CHOPPER PLTS WOULD JUST GIVE US MORE SEPARATION, THE PROB WOULD BE SOLVED. WHEN THEY SEE US THEY COULD SLOW OR HOVER, TURN, ETC. CONFLICTS OCCUR WHEN TWR FORGETS TO ADVISE ME THAT CHOPPER HAS ME IN SIGHT AND THE CHOPPER MAINTAINS HIS 'TRAJECTORY' WHICH CONFLICTS WITH MY LIMITED ARR OR DEP AIRSPACE.

13

DURING RIVER VISUAL APCH DCA (LNDG RWY 18), 3 HELIS CROSSED OUR FLT PATH. THE FIRST CAUSED AN RA ON TCASII WITH A 0-300 FT CLB (WHICH WE FOLLOWED). THE HELI WENT DIRECTLY UNDER OUR ACFT WITH LESS THAN 300 FT SEPARATION. THE NEXT 2 HELIS CAUSED MONITOR VERT DSCNT ON THE TCASII. ALL 3 HELIS WERE ENCOUNTERED IN A DISTANCE OF LESS THAN 1 MI. THE TWR NEVER CALLED ANY TFC, UNTIL WE CALLED THE FIRST HELI IN SIGHT. THEN HE SAID 3 HELIS WERE XING THE RIVER. WITHOUT THE RA WE WOULD HAVE COME EVEN CLOSER THAN 300 FT TO THE FIRST HELI.

14

WASHINGTON APCH CTL CLRED ACR X FOR THE MT. VERNON 36 APCH. AT THE WILSON BRIDGE THE TWR CLRED US TO LAND STOL ON RWY 33. I TURNED OFF THE MT. VERNON 36 APCH ONTO A L BASE LEG FOR RWY 33. THE PATTERN FLOWN WAS SQUARE. I TURNED FINAL ABOUT 1/2 MI S OF THE E BANK OF THE POTOMAC RIVER. AT NO TIME WERE WE ADVISED OF A HELI IN OUR AREA AND WE DID NOT HEAR THE TWR TALKING TO A HELI ON 119.1 (1-WAY OR 2-WAY COM). WE DID NOT SEE A HELI DURING OUR APCH. THE SKY WAS HAZY AND THE SUN WAS OFF THE L SIDE. IT WAS DAYLIGHT. LINED UP ON FINAL AND STABILIZED FOR A STOL LNDG, I SUDDENLY CAUGHT SIGHT OF A PRESIDENTIAL TYPE HELI XING OUR FLT PATH, APPROX 50-100 FT BELOW AND 100 FT IN FRONT OF US AT OUR 11:30 POS, AS WE PASSED THROUGH 600 FT MSL. THE HELI WAS MOVING L TO R AT A GOOD SPD, BUT I DETERMINED A COLLISION WAS POSSIBLE AND IMMEDIATELY APPLIED PWR, PULLED UP AND CALLED 'GAR' TO THE FO. AS WE PULLED UP I CALLED OUT THE HELI TO THE FO WHO THEN SAW IT CLOSE AND BELOW AS IT PASSED OFF THE R SIDE. THE GAR WAS UNEVENTFUL AND COMPLIED WITH TWR INSTRUCTIONS WHICH WERE GIVEN AFTER WE CALLED WITH GAR AND NEAR MISS. THE TWR'S RESPONSE WAS 'ROGER AND UNDERSTAND' ONLY. THE HELI IN QUESTION DID NOT APPEAR TO ALTER COURSE OR FLT PATH UNTIL DSNDING AND LNDG AT ANACOSTRA. ON THE GND I ATTEMPTED TO CALL THE TWR ON LANDLINE BUT KEPT GETTING A BUSY SIGNAL (3 ATTEMPTS). SINCE I WAS DUE BACK OUT IN 10 MINS FOR MY NEXT FLT, I RETURNED TO MY ACFT AND CONTINUED ON MY SCHEDULE. I WAS NEVER ABLE TO DETERMINE IF THE TWR KNEW OF OR HAD TALKED TO THE HELI IN QUESTION. MANY TIMES THE TWR TALKS TO HELIS ON A DIFFERENT FREQ, BUT YOU CAN HEAR THE TWR'S COM TO THEM ON 119.1. THEY WILL USUALLY POINT OUT HELI TFC TO US AND COMMENT THAT THE HELI IS AT SUCH AND SUCH AN ALT, DIRECTION AND THAT THEY (THE HELI) HAVE US IN SIGHT. THIS INCIDENT WAS 'VERY' CLOSE AND FAR FROM THE NORM I'VE EXPERIENCED IN 15 YRS OF FLYING INTO AND OUT OF DCA.

15
HOT, HAZY AFTERNOON IN WASHINGTON (HAZE DID RESTRICT VISIBILITY) FLYING THE RIVER VISUAL APCH TO RWY 18 AT DCA, CREW IS DCA BASED SO WE ARE VERY FAMILIAR WITH THIS APCH. AT ABOUT 4-5 DME, TWR ASKED US IF WE COULD LAND ON RWY 15, I DECLINED AND SAID THAT I'D LIKE TO CONTINUE FOR RWY 18. TWR THEN ADVISED US THERE WOULD BE 2 HELIS COMING OUT OF THE TIDAL BASIN AREA. (IT IS NOT AT ALL UNCOMMON TO SEE HELIS XING OUR FLT PATH WHEN WE ARE TAKING OFF TO THE N AND CLBING). I COULD SEE A CONTACT ON OUR TCASII SCREEN -- JUST ONE TARGET -- AND BTWN 600 AND 500 FT ON FINAL, WE GOT AN RA THAT COMMANDED CLB. I HAD THE FO LEVEL OFF AT 500 FT, THE TARGET SHOWED 200 FT BELOW ON THE TCASII AND VERY CLOSE ABEAM ME (ON 5 NM SCALE) AND I NEVER DID SEE EITHER HELI. WE STARTED BACK DOWN WHEN THE TCASII SHOWED WE WERE PASSED THEM, WE WERE HIGH AS WE ROLLED WINGS LEVEL ON FINAL BUT, WE WERE STILL ABLE TO SAFELY COMPLETE THE APCH. I HAVE BEEN FLYING THIS APCH AT DCA FOR 7 1/2 YRS, AND THIS ONE REALLY GOT MY ATTN. TWR IS NOT CTLING THE HELIS, I CAN'T BE SURE THE HELIS HAVE ME IN SIGHT, I KNOW THE SECOND HELI IS LOOKING AT HIS LEAD -- THEREFORE, I KNOW HE IS NOT LOOKING AT ME, AND I AM DSNDING INTO HIM WHILE ON FINAL ON A CHALLENGING APCH. THIS HAD THE POTENTIAL TO BE A MIDAIR, AND UNFORTUNATELY, PROBABLY IS CONSIDERED ROUTINE OPS BY DCA TWR.

16
MANEUVERING IN GOOD VMC FOR LNDG ON RWY 21 AT DCA (CLRED FOR VIS APCH, MONITORING TWR FREQ FOR LNDG CLRNC). TWR ADVISED OF HELI TFC BELOW AND AHEAD. THIS TFC WAS SPOTTED FLYING SW WHERE ANACOSTIA RIVER MEETS POTOMAC. NO CONFLICT, INITIALLY. THE HELI, A MIL TYPE, THEN TURNED NW UP THE POTOMAC RIVER. THIS NOW BECAME AN IMMEDIATELY INCREASING TFC CONFLICT. CONVERGING FLT PATHS. I ASKED TWR TO PROVIDE SEP, HOPING HE WOULD STOP, SLOW OR TURN THE HELI. HE RESPONDED WITH, "MAINTAIN VIS SEP." MANEUVERING IN CLOSE FOR A STOL LNDG ALLOWS FOR VERY LITTLE LEEWAY FROM THE DESIRED FLT PATH. A GAR FROM THIS POS IS ALSO DANGEROUS. THERE WAS NO TIME TO COMMUNICATE THIS TO TWR AND THE HELI WAS ON A DIFFERENT FREQ. I CONTINUED AND LANDED VERY CAUTIOUSLY WHEN I REALIZED WE WOULD MISS TFC. HOWEVER, WE ONLY MISSED BY APPROX 300'. I FEEL THAT ATC (TWR) IGNORED ITS BASIC OBLIGATION OF PROVIDING SEP. THE HELI COULD HAVE EASILY BEEN SLOWED, STOPPED OR TURNED AS A MEANS OF AVOIDING AN IMPENDING COLLISION. TWR CERTAINLY WOULD HAVE BEEN AWARE OF BOTH ACFT'S FLT PATHS. I HOPE THEY (TWR) DO NOT THINK 200-300' IS A SAFE AMOUNT OF TFC SEP. THIS HELI CONFLICT, AND POOR ATC SEP OF IT, AT DCA IS AN ONGOING PROB. HERE IS AN ACCIDENT WAITING TO HAPPEN.



Subjects ATC  Circle to Land (Deviate to RWY 33)  Close Calls  DCA  FAA  Frequency 119.1  Radar  Separation (ALL)  TCAS (All)  TCAS RA  Traffic in Sight  Visual Separation

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21600HRS
January 31, 2025, 14:48:00 GMT
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Post: 11818264
This procedure was not for sure designed so that the vertical separation is only separation, no, horizontal separation is supposed to be the way you do it. Separation is anyway based on visual avoidance in dark, not good! Anyway the HELO was zick zacking, not following the route 1 and 4, and did not maintain altitude, why was that?

30 seconds before the collision, when LC asked if they have traffic in sight, HELO was on track about 200\xb0, because of wind (320/25) HDG was somerhing like 215\xb0. Bearing to CRJ was 10 o’clock and to A319 about 11 o’clock. At this moment CRJ was flying track to North, base for rwy 33, and was not at all conflicting traffic from HELO’s point of view. Few seconds later HELO turned to the South, perhaps to avoid A319, soon after noticed that A319 will pass far ahead and turned back to right… so sad.

Subjects CRJ  Separation (ALL)  Traffic in Sight  Vertical Separation

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bluesideoops
February 01, 2025, 02:33:00 GMT
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Post: 11818713
Captain Steeve has a good analyis and probably quite close to what actually happened. I agree with the comment on the video that at the point which PAT25 initially requests visual separation and confirms traffic in sight, it looks like the AA5324 CRJ had already commenced right turn for circling approach at which point the brightest landing lights would be the aircraft behind as AA5324s would no longer be pointing directly at the helicopter. The brightest landing light is now the No.2 traffic which PAT25 identifies as their traffic and will probably now be fixated on due to confirmation bias. Terribly tragic and could happen to any pilot at night.



Subjects CRJ  Circle to Land (Deviate to RWY 33)  PAT25  Separation (ALL)  Traffic in Sight  Visual Separation

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nojwod
February 01, 2025, 11:39:00 GMT
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Post: 11818951
Originally Posted by clearedtocross
According to CNN, the crash was waiting to happen.
https://edition.cnn.com/2025/01/30/u...nvs/index.html
Originally Posted by bluesideoops
Captain Steeve has a good analyis and probably quite close to what actually happened. I agree with the comment on the video that at the point which PAT25 initially requests visual separation and confirms traffic in sight, it looks like the AA5324 CRJ had already commenced right turn for circling approach at which point the brightest landing lights would be the aircraft behind as AA5324s would no longer be pointing directly at the helicopter. The brightest landing light is now the No.2 traffic which PAT25 identifies as their traffic and will probably now be fixated on due to confirmation bias. Terribly tragic and could happen to any pilot at night.


https://www.youtube.com/watch?v=hfgllf1L9_4

If they were using NVG as speculated, the failure to see the landing lights of the approaching aircraft might be explained by a scenario where :

Crew mistakenly identified the following aircraft, either with NVG on or temporarily off. Happy with the separation, the NGV gear goes back on and with the limited field of view from the goggles, focused ahead and down as visual flight demands, the landing lights, so bright in the videos, were just never seen, but without the goggles the peripheral vision of the crew might have had some warning.

Subjects CNN  CRJ  Circle to Land (Deviate to RWY 33)  Night Vision Goggles (NVG)  PAT25  Separation (ALL)  Traffic in Sight  Visual Separation

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gretzky99
February 02, 2025, 03:10:00 GMT
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Post: 11819482
Originally Posted by Denflnt
If ATC relied solely on the helo to keep from hitting the CRJ, that is a big effing problem.
As soon as the helo reported the traffic in sight, that's exactly what happened, and it's exactly how the system is designed.

Yes it's a "big effing problem". But it's a "big effing problem" of the system, not the specific ATC on duty at the time.

Subjects ATC  CRJ  Traffic in Sight

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remi
February 02, 2025, 07:41:00 GMT
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Post: 11819563
Originally Posted by photonclock
These aircraft crashed, as per the system specifications.

So the system is, to put it plainly...FUBAR?

That's not good.
See and avoid will always eventually produce midair collisions because physics, geometry, and humans don't permit see and avoid to work flawlessly.

This incident follows the same script as decades of others where ATC verifies that a pilot has the (incorrect) traffic in sight and shortly afterward there is a midair.

Subjects ATC  See and Avoid  Traffic in Sight

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