Posts about: "Situational Awareness" [Posts: 61 Page: 1 of 4]ΒΆ

Semreh
January 30, 2025, 09:18:00 GMT
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Post: 11817034
Putting humans in situations where failing to notice something results in catastrophic consequences is bad engineering, not human error. I am very glad that no-one is pointing at one, or either, pilot or flight-crew's actions or inactions and saying pilot/human error.

The human visual system is good at picking up movement across the visual field. As other have pointed out, if the two aircraft were on intersecting vectors, there would be no relative movement to be picked up. Bright(er) lights don't help: if anything, they make it harder to make out the source from the background, as the bright light makes the local background look like a uniform dark field.

From a 'human factors' point of view, if you have an incorrect situational awareness model in your consciousness, it is difficult to remain flexible enough to recognise you might be wrong - misidentifying the next in sequence, AAL3130, landing runway 1, as the CRJ (IF that is what happened) is hard to recover from.

We should not blame the flight-crews. We should not engineer them into situations where incorrect interpretation of what were likely inputs that were easy to interpret in more than one way become catastrophic. The problem is not restricted to air-navigation. One of the many reasons Norway lost the frigate Helge Ingstad in a collision was misidentification of a moving object (a brightly lit oil tanker) as a stationary object (an oil terminal), and incorrectly ascribing radio transmissions as coming from other moving ships in the vicinity,

The personnel on the bridge of Helge Ingstad both before and after the change of watch 20 minutes before the accident were of the opinion that the lights they saw from Sola TS were from a stationary object in connection with the Sture Terminal , and not from an oncoming ship. Contrary to the International Regulations for Preventing Collisions at Sea , [60] "Sola TS" had the same deck lights on after the ship left as when they were still at the terminal. The personnel on the bridge of Helge Ingstad were of the opinion that the radio call just before the accident was from one of the three other oncoming ships.
We should look at how to engineer things better to avoid this happening: this does not mean 'more training', 'brighter lights', or putting additional human-operated steps in already complex procedures.


Subjects CRJ  Situational Awareness

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Flch250
January 30, 2025, 10:10:00 GMT
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Post: 11817083
Frequencies in use. It is not clear to me if everyone was on the tower frequency.

I suspect possibly not.

We also have a VHF helicopter TAC and UHF Mil Aero frequencies possible..

Can this lead to less information or SA, perhaps.


Subjects Situational Awareness

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Teddy Robinson
January 30, 2025, 10:18:00 GMT
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Post: 11817090
Originally Posted by Flch250
Frequencies in use. It is not clear to me if everyone was on the tower frequency.

I suspect possibly not.

We also have a VHF helicopter TAC and UHF Mil Aero frequencies possible..

Can this lead to less information or SA, perhaps.
Fair comment.
I had a very nasty encounter at V1 with an underslung shipping container dangling below a USN CH53 that was masked by a dust cloud.
He had been cleared to depart 5 minutes previously on the MIL frequency, but used those minutes stabilising his load.
Meanwhile, unaware of this, the civilian tower frequency cleared us for takeoff.
It was not pretty.

Subjects Situational Awareness

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kap'n krunch
January 30, 2025, 17:22:00 GMT
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Post: 11817431
Condolences to the families of the victims - the lives of many changed forever in an instant.

In my opinion, there are way too many issues that contributed to this horrific incident.

An outdated airport that exists primarily for the benefit of the governing class. Seriously, take a few minutes to look at the approach plates - a circle to land approach to rwy 33, 5,200 ft, at night - really??

A video I watched this morning described the government priority parking spaces, special hotline to the airlines to hold planes for last minute departing bureaucrats. As noted above, for several years the destinations from KDCA were tightly controlled to limit the number of operations, yet this has been compromised by bureaucrats utilizing special privileges to lobby airlines to obtain direct flights to their home cities. After all, it\x92s a far longer drive to KIAD.

Apparently there was some talk years ago to utilize KADW, which is also close to the center of government as a replacement to KDCA, but the neighborhood didn\x92t want the noise.

I think the fact the helo was communicating with the KDCA tower on UHF, (SOP in that area) complicates the SA of all involved. Use of the NVG in the helo with a crew of 3 restricted the SA of the crew. An additional crew member on the helo may have helped.

As mentioned, USA ATC hasn\x92t been up to the usual standards but have some empathy for these folks as staffing levels have significantly degraded and they are being asked to do more with less and I think all aircrew operating in the US are aware of this.

Trumps press conference never should have involved the political aspect, it really degrades the message to the victims families. This is an opportunity to fix the problems in the system, invest money in upgrading staffing levels and equipment and changing poor practices that have been accepted into the norm.

Subjects ATC  Circle to Land (Deviate to RWY 33)  KDCA  Night Vision Goggles (NVG)  Situational Awareness

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TachyonID
January 30, 2025, 20:39:00 GMT
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Post: 11817633
Comms

Since the Blackhawk pilot was on a different (military) band is it possible he thought AA5342 was landing on 1, not 33?
He may have missed the landing permission to 33 for 5342, even as he lost SA being focused on a plane further out on approach to 1.
He clearly heard the instructions of the LC and responded to the LC, but was badly out of position WRT the approach to 33.
The recreation makes it appear that he was staying parallel to the 1 approach, probably waiting for the "next in line", the landing lights he probably was fixated on.


Subjects AA5342  Blackhawk (H-60)  Situational Awareness

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KRviator
January 30, 2025, 21:42:00 GMT
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Post: 11817677
Originally Posted by TachyonID
Since the Blackhawk pilot was on a different (military) band is it possible he thought AA5342 was landing on 1, not 33?
He may have missed the landing permission to 33 for 5342, even as he lost SA being focused on a plane further out on approach to 1.
He clearly heard the instructions of the LC and responded to the LC, but was badly out of position WRT the approach to 33.
The recreation makes it appear that he was staying parallel to the 1 approach, probably waiting for the "next in line", the landing lights he probably was fixated on.
What makes you think the BlackHawk crew were on UHF, not VHF? Every military aircraft I've ever flown in - and there's been a few - speak to civilian controllers on civil VHF frequencies.

Subjects AA5342  Blackhawk (H-60)  Situational Awareness

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Rushed Approach
January 30, 2025, 22:19:00 GMT
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Post: 11817705
Originally Posted by Equivocal
From the comments on this thread, it seems like many are unclear about flight rules and responsibilities of pilots and ATC. I'm not suggesting that the rules are good or applied in an appropriate way but, simply, the rules are clear....even if understanding is not.
OK so what's your interpretation of the rules here then?

The airliner is under IFR rules on its flight plan until it gets changed to a different runway, when it's then VFR.

The chopper is under VFR, stooging along a river at 200 ft and avoiding traffic on approach to Reagan by visual clues alone.

Radar useless as the aircraft are too low.

Airliner TCAS useless as inhibited, even if it can decode the military transponder's data.

Radio situational awareness compromised as chopper on UHF, airliner on VHF. So each aircraft can neither hear the other nor the ATC instructions to that aircraft.

It's difficult to see aircraft at night against a backdrop of a city with thousands of lights. And when you're gonna hit something, as others have said, that light doesn't move relative to you, so you don't notice it - it just blends into the background lights.

It only takes the chopper to misidentify the aircraft it's supposed to go behind and to therefore turn into the path of the airliner it was supposed to avoid - draw the map with the vectors and it all makes sense. These two aircraft ended up in the Potomac, but they could have ended up in much worse places in terms of loss of life on the ground.

Seems to me it's been an accident waiting to happen for some time.



Subjects ATC  Accident Waiting to Happen  IFR  Pass Behind  Pass Behind (All)  Radar  Situational Awareness  TCAS (All)  VFR

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alfaman
January 30, 2025, 22:35:00 GMT
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Post: 11817716
Originally Posted by Rushed Approach
OK so what's your interpretation of the rules here then?

The airliner is under IFR rules on its flight plan until it gets changed to a different runway, when it's then VFR.

The chopper is under VFR, stooging along a river at 200 ft and avoiding traffic on approach to Reagan by visual clues alone.

Radar useless as the aircraft are too low.

Airliner TCAS useless as inhibited, even if it can decode the military transponder's data.

Radio situational awareness compromised as chopper on UHF, airliner on VHF. So each aircraft can neither hear the other nor the ATC instructions to that aircraft.

It's difficult to see aircraft at night against a backdrop of a city with thousands of lights. And when you're gonna hit something, as others have said, that light doesn't move relative to you, so you don't notice it - it just blends into the background lights.

It only takes the chopper to misidentify the aircraft it's supposed to go behind and to therefore turn into the path of the airliner it was supposed to avoid - draw the map with the vectors and it all makes sense. These two aircraft ended up in the Potomac, but they could have ended up in much worse places in terms of loss of life on the ground.

Seems to me it's been an accident waiting to happen for some time.
I can't speak for the USA, but my understanding was always that the flight rules for the CRJ don't change, unless the crew cancel their IFR plan: ie flying a visual approach doesn't change the flight rule status. The crew can still expect IFR separation from other IFR & SVFR flights, & traffic information on conflicting VFR flights.

Subjects ATC  Accident Waiting to Happen  CRJ  IFR  Pass Behind  Pass Behind (All)  Radar  Separation (ALL)  Situational Awareness  TCAS (All)  VFR

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canigida
January 30, 2025, 23:24:00 GMT
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Post: 11817756
Originally Posted by Rushed Approach
OK so what's your interpretation of the rules here then?

The airliner is under IFR rules on its flight plan until it gets changed to a different runway, when it's then VFR.

The chopper is under VFR, stooging along a river at 200 ft and avoiding traffic on approach to Reagan by visual clues alone.

Radar useless as the aircraft are too low.

Airliner TCAS useless as inhibited, even if it can decode the military transponder's data.

Radio situational awareness compromised as chopper on UHF, airliner on VHF. So each aircraft can neither hear the other nor the ATC instructions to that aircraft.

It's difficult to see aircraft at night against a backdrop of a city with thousands of lights. And when you're gonna hit something, as others have said, that light doesn't move relative to you, so you don't notice it - it just blends into the background lights.

It only takes the chopper to misidentify the aircraft it's supposed to go behind and to therefore turn into the path of the airliner it was supposed to avoid - draw the map with the vectors and it all makes sense. These two aircraft ended up in the Potomac, but they could have ended up in much worse places in terms of loss of life on the ground.

Seems to me it's been an accident waiting to happen for some time.
"It's difficult to see aircraft at night against a backdrop of a city with thousands of lights." - DC isn't actually that big of a city or that brightly lit, and it seems the UH-60 was heading south west, well away from DC toward a not very dense part of suburban N. Virginia. Mostly they would see a very wide part of the Potomac river ahead, and in the distance on the western shore is a Daingerfield island (US park service land and mostly unlit), the GW parkway going N/S for a couple hundred meters (all the parkways are dangerously unlit IMO) followed by some low level typical suburb condos of a couple stories towards Potomac Yard, which other than street lights or the sign from Target is not very bright. I kayak there all the time and there's nothing much to see looking westward. I've been out of KVKX at night and can see that area and it's not dazzling.

"Radar useless as the aircraft are too low." - It seems there's valid radar returns from both aircraft. the FAA has a good diagram of the Potomac TRACON radar sites, about 10 different radars, and having visited the TRACON several times, they readily explain there's another nearly facility that is a duplicate of their radar feed, but for national security. I assume there's coverage till the river service for security to prevent someone from sneaking up the river with bad ideas

"Radio situational awareness compromised as chopper on UHF, airliner on VHF. " - I fly in the area and in my experience everyone is on the same VHF, they might be also duped to UHF and can hear everybody on my handheld. You hear AF-1 all the time on freq.

"The chopper is under VFR, stooging along a river at 200 ft and avoiding traffic" - Most of the area NE of the airfield in a prohibited area, and there's a lot of military installations within 5 miles of DC that they are shuttling around, so that path seems perfectly acceptable given the numerous constraints. there's nothing wrong with a helo corridor as long as you stay within it and maintain the prescribed altitude. Also, it's not like KDCA is some secret place, the flight paths are pretty well known if that's where you work. It's popular to sit in parks on both ends and watch the planes, there's literally millions of local people that know exactly the planes are coming and going on both directions. so if you're a helo there, you know where the hot spots are. Likewise, its not just any helo in that area, everyone is vetted, fingerprinted in the inner FRZ.

" on approach to Reagan by visual clues alone" - The UH-60 was not going to DCA, the assumption was it was using the helo route 4 corridor. All the UH-60Ls I've seen have full glass with moving map and I'm assuming a magenta line for the helo corridor.

Fun Fact - Calling it "Reagan" will get you tarred and feathered in the area. Folks refuse to utter the name and for years (decades) the Metro refused to rename the station until legally forced.

Last edited by Senior Pilot; 31st January 2025 at 00:05 . Reason: Prescribed/proscribed

Subjects ATC  Accident Waiting to Happen  DCA  FAA  Hot Spots  IFR  KDCA  Pass Behind  Pass Behind (All)  Radar  Route 4  Situational Awareness  TCAS (All)  VFR

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moosepileit
January 31, 2025, 01:18:00 GMT
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Post: 11817827
Originally Posted by Rushed Approach
OK so what's your interpretation of the rules here then?

The airliner is under IFR rules on its flight plan until it gets changed to a different runway, when it's then VFR.

The chopper is under VFR, stooging along a river at 200 ft and avoiding traffic on approach to Reagan by visual clues alone.

Radar useless as the aircraft are too low.

Airliner TCAS useless as inhibited, even if it can decode the military transponder's data.

Radio situational awareness compromised as chopper on UHF, airliner on VHF. So each aircraft can neither hear the other nor the ATC instructions to that aircraft.

It's difficult to see aircraft at night against a backdrop of a city with thousands of lights. And when you're gonna hit something, as others have said, that light doesn't move relative to you, so you don't notice it - it just blends into the background lights.

It only takes the chopper to misidentify the aircraft it's supposed to go behind and to therefore turn into the path of the airliner it was supposed to avoid - draw the map with the vectors and it all makes sense. These two aircraft ended up in the Potomac, but they could have ended up in much worse places in terms of loss of life on the ground.

Seems to me it's been an accident waiting to happen for some time.
IFR, not VFR, the airliner is circling in VMC. This invalidates the following, with a lack of knowing the distict difference- that said, the conclusion is correct, it was bound to happen, the swiss cheese just had to align.

It's eerily similar to the P-63/B-17 midair- a blind collision that was instantly apparent how flawed the basic plan was, even though it had worked before.


Subjects ATC  Accident Waiting to Happen  IFR  Pass Behind  Pass Behind (All)  Radar  Situational Awareness  TCAS (All)  VFR

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ex-EGLL
January 31, 2025, 01:37:00 GMT
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Post: 11817836
I've seen plenty of mention of VHF / UHF mix in the thread. Does DCA have the ability to cross couple their frequencies? This helps immensely in maintaining situational awareness for the crews, and also helps preventing two transmissions at once.

Subjects DCA  Situational Awareness

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Sam W
January 31, 2025, 03:37:00 GMT
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Post: 11817886
Originally Posted by Foxxster
Just heard that there are meant to be two ATC on duty however on the night of the incident, only one was on duty.
And everything indicates the controller did their job accurately and competently. It appears a single controller for all traffic would have significantly greater situational awareness than two on different frequencies.

Last edited by Senior Pilot; 31st January 2025 at 06:37 . Reason: Remove political diatribe: what part of ‘No Politics in this thread’ didn’t you understand?

Subjects ATC  Situational Awareness

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Mozella
January 31, 2025, 05:18:00 GMT
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Post: 11817928
Originally Posted by KRviator
What makes you think the BlackHawk crew were on UHF, not VHF? Every military aircraft I've ever flown in - and there's been a few - speak to civilian controllers on civil VHF frequencies.
My experience is just the opposite from yours. I can't speak about this BlackHawk but I can say that every military aircraft I've ever flown, and there have been many, spoke to civilian controllers on UHF manly because they were not equipped with VHF radios. I've never been helicopter qualified (thank the Lord) but I've ridden in a few military helos and they were also strictly UHF.
Of course, this BlackHawk might be different. I don't know if it had UHF or VHF communication or perhaps both; however, quite a few reports claim that the helo was communicating on UHF so that both the RJ and the helo could hear the same controller, but they couldn't hear each other. That is quite common in my experience, but that is not to say that it's a good thing since it has the potential to reduce situational awareness.

Subjects ATC  Blackhawk (H-60)  Situational Awareness

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PPRuNeUser134364
January 31, 2025, 12:24:00 GMT
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Post: 11818163
Originally Posted by phantomsphorever
I fully agree with Return_2_Stand
To ask somebody if he is visual with a specific aircraft type at night is almost worthy of a Monty Python sketch.
I am old, but 20 years ago - that type of question would be more like:

- "..confirm you are visual with the aircraft at your 12'o clock - 1 Nautical Mile - same altitude - heading your way...." or
- " ..confirm you have traffic on 1 mile final Rwy 33 in sight"

So they will probably crucify the heli pilot or the controller or both.
But in reality these guys had one leg in the grave and the other one in prison, operating in this area under the procedures that were proposed and agreed by the authorities.
But that isn't the first communication that mentions the CRJ. The heli had previously been told the exact location, altitude, type and which runway the CRJ was positioning for. The heli crew replied that they were visual. It is only later that the controller refers to the CRJ in isolation (with no position) but he is simply querying 'are you still visual with the aircraft that you literally just told me you were visual with?'. There is no need for any night ID skills and even if you don't have a clue what a CRJ looks like, that entire combination of calls still make sense. I agree that if the heli had been made more aware of how proximate the CRJ was then that might have resolved an incorrect SA picture, but the heli had repeatedly told the controller that he was visual. If a procedure is designed that allows a heli to correctly pass under another aircraft by 100-200 feet, at night, is the controller really supposed to be able to judge from the tower whether they are extremely close (as would appear to be the case if they were both on the correct path) or if they were on a collision course?

Originally Posted by mikegss
[sorry, I don't know how to include nested quotes!]

SLF here. During my time working offshore in the North Sea, on a couple of occasions my return chopper to Aberdeen was "held" in the air just off the threshold to allow an incoming FW to land.
If that was a hold in the hover, it would likely have been a low hover on a cross runway (or another safe place on the airfield). I would be amazed if Aberdeen asked a heli to hold in the hover, offshore, at height, at night. Aside from the disorientation issues, it isn't a comfortable place for a heli to be in case of a malfunction. If I was coming back to Aberdeen from the North Sea and was asked to hold to the east of Aberdeen, away from the airfield, I would fly a racetrack/orbit.

Subjects ATC  CRJ  Hover  Situational Awareness

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Jetstream67
January 31, 2025, 13:31:00 GMT
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Post: 11818201
Originally Posted by SAR Bloke
But that isn't the first communication that mentions the CRJ. The heli had previously been told the exact location, altitude, type and which runway the CRJ was positioning for. The heli crew replied that they were visual. It is only later that the controller refers to the CRJ in isolation (with no position) but he is simply querying 'are you still visual with the aircraft that you literally just told me you were visual with?'. There is no need for any night ID skills and even if you don't have a clue what a CRJ looks like, that entire combination of calls still make sense. I agree that if the heli had been made more aware of how proximate the CRJ was then that might have resolved an incorrect SA picture, but the heli had repeatedly told the controller that he was visual. If a procedure is designed that allows a heli to correctly pass under another aircraft by 100-200 feet, at night, is the controller really supposed to be able to judge from the tower whether they are extremely close (as would appear to be the case if they were both on the correct path) or if they were on a collision course?
.....
In the inevitable "what would we do with 20/20 hindsight" test describing the jet as (e.g.) " Jet on approach, your 10 clock, passing 1200 feet at 2 miles (instead of south of some local bridge) might have been more helpful/ alarming if the Heli pilots were not locals. Moot point as Heli requested/was allowed own lookout (Visual separation) and clearly (rightly) the controller was still worried and checked. .

Last edited by Jetstream67; 31st January 2025 at 13:37 . Reason: clarity

Subjects ATC  CRJ  Separation (ALL)  Situational Awareness  Visual Separation

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TCAS FAN
January 31, 2025, 15:37:00 GMT
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Post: 11818300
Originally Posted by Lascaille
His first video had responses from the helo, just not all of them... The civ ATC is sending to the helo on VHF and receiving on UHF? Is that mentioned anywhere on the VAS Aviation channel? Because the LiveATC recordings page has clips which include all the audio with no mention of splices being made.
Which could indicate that the controller was simultaneously transmitting on two frequencies (VHF+UHF) and the frequencies were not cross-coupled, resulting in the traffic on VHF not being able to hear the traffic on UHF, and vice-versa.

Cross-coupling, whereby aircraft transmissions are re-broadcast on the other frequency being used is a mandatory requirement at civil ATC units in UK. This being done to facilitate situational awareness of other traffic by all crews.

Subjects ATC  Situational Awareness

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island_airphoto
January 31, 2025, 15:55:00 GMT
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Post: 11818313
Originally Posted by TCAS FAN
Which could indicate that the controller was simultaneously transmitting on two frequencies (VHF+UHF) and the frequencies were not cross-coupled, resulting in the traffic on VHF not being able to hear the traffic on UHF, and vice-versa.

Cross-coupling, whereby aircraft transmissions are re-broadcast on the other frequency being used is a mandatory requirement at civil ATC units in UK. This being done to facilitate situational awareness of other traffic by all crews.

That would defeat the original intent of the separate helo controller herding them around without having to deal with the very busy airplane tower frequency. Obviously this totally fails when there is only one person

Subjects ATC  Situational Awareness  TCAS (All)

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biscuit74
January 31, 2025, 17:45:00 GMT
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Post: 11818407
Originally Posted by D Bru
In defence of the helo crew: operating in class B (VFR, IFR no matter), who could have expected that when LC asked them to spot the CRJ and pass behind, they would be already so terribly close and closing in rapidly.....
Indeed, and from what others have shown here, very easy for them to have focussed on the AA aircraft which was on approach to runway 1.

I was also a little surprised at the suggestion that the helicopter crew may have been using NVGs. Perhaps someone with knowledge of this sort of thing might comment? Would that be normal - it seems that on a fine bright night, in a busy tight environment, as well lit as it is NVGs would seriously add risk. Whjy not fly out normally then go to NVGs once out of the high intensity area? It sounds as if NVGs add flare, reduce SA and make scan much harder. I guess that is an acceptable trade of when dealing with typical military operations at night, but it rather surprises me they might be used in this emvironment.

Any comment or enlightenment welcomed !

Subjects CRJ  IFR  Night Vision Goggles (NVG)  Pass Behind  Pass Behind (All)  Situational Awareness  VFR

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YRP
February 01, 2025, 14:45:00 GMT
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Post: 11819065
Originally Posted by TCAS FAN
Which could indicate that the controller was simultaneously transmitting on two frequencies (VHF+UHF) and the frequencies were not cross-coupled, resulting in the traffic on VHF not being able to hear the traffic on UHF, and vice-versa.

Cross-coupling, whereby aircraft transmissions are re-broadcast on the other frequency being used is a mandatory requirement at civil ATC units in UK. This being done to facilitate situational awareness of other traffic by all crews.
I was going to ask if cross-coupling is done in the US.

It\x92s pretty common in Canada, both at Tower and enroute IFR sectors.

It\x92s not just for situational awareness, also to prevent overlapping transmissions from aircraft on the two frequencies. So you don\x92t have to try to listen to both as the controller.

Even without that the controllers here almost always transmit on all their frequencies rather than just the one the aircraft is on.

Subjects ATC  IFR  Situational Awareness  TCAS (All)

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island_airphoto
February 02, 2025, 03:33:00 GMT
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Post: 11819493
Originally Posted by galaxy flyer
I’m not in job of defending the US system, but there needs to be some perspective. The US airspace operates about 40%-50% of all global aviation. Only half of daily flights are air carrier. For lot of reasons outside this discussion, air carriers are the default transport, trains and buses are a tiny fraction of long distance transport. Apply EASA aviation standards and the US network would grind to halt or create huge gaps in service. We’ve gone 16 years without a fatal US carrier major accident, which isn’t different than the rest of the world, especially when the US has a 50% share. Our economy would suffer greatly and passengers revolt at what would required.

All that said, the plan for DCA, particularly the helicopter ops, were hazardous in the extreme. The Route 4/33 operations is just plain dangerous, nothing less. The politics of DCA are going to drive a band-aid fix is my prediction. Visual separation won’t go away. FAA will get crucified over manning. DCA may lose some significant service, if we closed 33 permanently. If I read the NOTAM correctly, closing 4 and 33, the pain will become known, interestingly, I read elsewhere that the helicopter altitudes were raised to 200’ in 2023 due to noise complaints.
The area is extraordinarily sensitive to noise complaints. I muffed a landing at KVKX just a few miles away after the takeoff curfew and someone called the cops on me for going around and I got a bit annoyed with them and told them they weren't the air police.
And yes, trying to do EU IFR for everything all the time would create some epic traffic jams.
* IMHO they need the dedicated helicopter controller on at ALL times the helicopters are flying and they need to be held for crossing traffic. They also all need ADS-B, no private pilot that wasn't totally skint would be running around with the lack of situational awareness the helos seem to have in an area like that.

Subjects ADSB (All)  ATC  DCA  FAA  IFR  Separation (ALL)  Situational Awareness  Visual Separation

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