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| island_airphoto
February 16, 2025, 18:49:00 GMT permalink Post: 11829389 |
The point is that PAT25 could have been tightly hugging the eastern bank at precisely 200 feet, and yet everyone would still have died if the CRJ had been slightly below its proper approach path (as it might easily have been). Yes, you can say that *this* accident wouldn't have happened if the helo had been at 200 feet, but that gets us precisely nowhere in preventing recurrence. Systems that rely on human perfection are 100% guaranteed to fail. The only question is how often.
Altimetry and height keeping would be important matters for investigators if the collision had occurred due to a breakdown in vertical separation, which as a minimum would involve 500 feet (and more often 1000 feet) of planned spacing to account for instrument and height keeping errors. FAA instrument rating standards require pilots to be able to maintain altitude plus or minus 100 feet. This helicopter was being flown VFR at very low height, which means that looking outside takes primacy over monitoring instruments. I'm sure helo pilots could fly along at 175ft plus or minus 25ft if they really tried, but you can be certain they wouldn't be looking out for traffic (as required when taking visual separation). However, as there was no vertical separation built into this procedure, all of this is at best a distraction. The more important questions are why procedural barriers were not in place to stop the route being used during landings on runway 33, and whether visual separation at night is an adequate barrier to collision when airliners and their human cargo are involved. N123, do you see the closest plane lined up, pass right below and behind him and never mind all the other planes right behind. Ah......NO. There is night visual and there is night nutty visual. The first example leaves a lot of room for error and time for ATC to see if it is going wrong. Subjects
ATC
CRJ
FAA
PAT25
Pass Behind
Pass Behind (All)
Separation (ALL)
VFR
Vertical Separation
Visual Separation
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| WillowRun 6-3
February 16, 2025, 22:06:00 GMT permalink Post: 11829489 |
Easy Street:
"However, as there was no vertical separation built into this procedure, all of this is at best a distraction. The more important questions are why procedural barriers were not in place to stop the route being used during landings on runway 33, and whether visual separation at night is an adequate barrier to collision when airliners and their human cargo are involved." Aircraft accidents bring lawsuits - like it or not. I'm not a member now, nor have I been a member, of the part of the profession which specializes in suing usually anybody plausible as a defendant. That doesn't mean, as an attorney first and SLF second, I don't see big problems looming ahead. (A prior post on legal factors was junked by the mods, but that was then, this is. . . .) The FAA and the U.S. Army are privileged with sovereign immunity, as a general rule. A federal statute - the Federal Tort Claims Act - enacted a waiver of sovereign immunity BUT with an important exception. If the allegedly negligent act (or omission) was taken (or failed to be taken) as part of a "discretionary function", immunity still exists. The basic explanation is that discretionary functions involve policy judgments which, in the view of Congress, cannot be "second-guessed" in lawsuits over alleged federal agency negligence. The other half of the equation is that immunity is waived for "ministerial" actions, sort of (to over-simplify) plug-and-chug activities. Is the construction and operation of the airspace around DCA a matter of policy judgment? I can almost hear the lawyers planning to file suit arguing that airspace rules which make simple, obvious sense are not derived from policy judgments. I can almost hear them issuing subpoenas (through the necessary international process) of Network Manager or MUAC senior managers to gain testimony that in European airspace, as others have observed about Heathrow, the airspace rules are more like "plug-and-chug" than the sometimes esoteric, and usually vague and/or ambiguous, factors which inform the choices made in - offensive phrase coming - "the policy world." And will our fine feathered legal eagles sue American too, just to go after the deep pocket, and try to force the airline to take a position on the federal immunity questions? It's too bad so much attention is focused on the dumb shows and noise currently meant to entertain the grandstands (if you get my meaning). There should be a way to compensate the families of the people who perished in this awful, tragic, and ultimately senseless midair collision. Is the United States civil justice system really going back to 1960 and pretending that what we are dealing with is the December 16 1960 DC-8 - L-1049 Super Constellation midair? As another poster way, way upthread said, I feel rage. Subjects
DCA
FAA
Separation (ALL)
Vertical Separation
Visual Separation
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| Easy Street
February 16, 2025, 22:52:00 GMT permalink Post: 11829513 |
The basic explanation is that discretionary functions involve policy judgments which, in the view of Congress, cannot be "second-guessed" in lawsuits over alleged federal agency negligence. The other half of the equation is that immunity is waived for "ministerial" actions, sort of (to over-simplify) plug-and-chug activities.
Is the construction and operation of the airspace around DCA a matter of policy judgment? I can almost hear the lawyers planning to file suit arguing that airspace rules which make simple, obvious sense are not derived from policy judgments. I can almost hear them issuing subpoenas (through the necessary international process) of Network Manager or MUAC senior managers to gain testimony that in European airspace, as others have observed about Heathrow, the airspace rules are more like "plug-and-chug" than the sometimes esoteric, and usually vague and/or ambiguous, factors which inform the choices made in - offensive phrase coming - "the policy world." If we took the FAA to be undertaking "plug and chug" regulatory and procedural activities, unburdened by political considerations and at risk of having EASA or UK CAA regulations and procedures held up as comparators in negligence cases against it, then I think it is highly unlikely that FAA regulations would be as permissive as they are in respect of visual separation and runway occupancy (the two most obvious and frequently cited points of difference, at least where airline operations are concerned), or that DCA\x92s helicopter routes would have existed. So why such a difference in approach? Economic factors are usually held up as the reason, and I fear this takes us away from "plug and chug" regulation into policy territory where immunity would seemingly apply. I very much doubt that any politician, corporate lobbyist or general would explicitly advance the argument that occasional accidents are a tolerable price for the traffic capacity enhancements enabled by visual separation. It'll be interesting to see whether the NTSB forces that argument into the open, or enables it to be avoided by distracting itself with altimetry and other such matters. Last edited by Easy Street; 16th February 2025 at 23:35 . Subjects
DCA
FAA
NTSB
Separation (ALL)
Visual Separation
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| Wide Mouth Frog
February 17, 2025, 00:49:00 GMT permalink Post: 11829561 |
Easy Street:
"However, as there was no vertical separation built into this procedure, all of this is at best a distraction. The more important questions are why procedural barriers were not in place to stop the route being used during landings on runway 33, and whether visual separation at night is an adequate barrier to collision when airliners and their human cargo are involved." Aircraft accidents bring lawsuits - like it or not. I'm not a member now, nor have I been a member, of the part of the profession which specializes in suing usually anybody plausible as a defendant. That doesn't mean, as an attorney first and SLF second, I don't see big problems looming ahead. (A prior post on legal factors was junked by the mods, but that was then, this is. . . .) The FAA and the U.S. Army are privileged with sovereign immunity, as a general rule. A federal statute - the Federal Tort Claims Act - enacted a waiver of sovereign immunity BUT with an important exception. If the allegedly negligent act (or omission) was taken (or failed to be taken) as part of a "discretionary function", immunity still exists. The basic explanation is that discretionary functions involve policy judgments which, in the view of Congress, cannot be "second-guessed" in lawsuits over alleged federal agency negligence. The other half of the equation is that immunity is waived for "ministerial" actions, sort of (to over-simplify) plug-and-chug activities. Is the construction and operation of the airspace around DCA a matter of policy judgment? I can almost hear the lawyers planning to file suit arguing that airspace rules which make simple, obvious sense are not derived from policy judgments. I can almost hear them issuing subpoenas (through the necessary international process) of Network Manager or MUAC senior managers to gain testimony that in European airspace, as others have observed about Heathrow, the airspace rules are more like "plug-and-chug" than the sometimes esoteric, and usually vague and/or ambiguous, factors which inform the choices made in - offensive phrase coming - "the policy world." And will our fine feathered legal eagles sue American too, just to go after the deep pocket, and try to force the airline to take a position on the federal immunity questions? It's too bad so much attention is focused on the dumb shows and noise currently meant to entertain the grandstands (if you get my meaning). There should be a way to compensate the families of the people who perished in this awful, tragic, and ultimately senseless midair collision. Is the United States civil justice system really going back to 1960 and pretending that what we are dealing with is the December 16 1960 DC-8 - L-1049 Super Constellation midair? As another poster way, way upthread said, I feel rage. Subjects
DCA
FAA
Separation (ALL)
Vertical Separation
Visual Separation
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| dbcooper8
February 17, 2025, 03:42:00 GMT permalink Post: 11829612 |
I agree the altimeters are not as an important an issue as the flawed policies and procedures were. Were the helicopter routes originally approved for day VMC only while, years ago, the airport was much less busy and over time due to pressures layers of added operations were added such as night and NVG operations?
While the PAT 25 pilots, prior to take off, would set the barometric pressure each gauge must have no more than a +/- 75 foot error (FAA). One gauge may have read + 50 feet high while the other one read - 50 feet low which would account for the 100 foot difference in flight between the two barometric altimeters. Many mechanical and pilot input errors would be potential factors. Not common but sometimes a pilot will read back the correct setting while at the same time setting a different value by mistake. IF the 100 foot discrepancy was discussed initially on the ground it may account for the lack of discussion , later in the flight, while at 400 feet PM and 300 feet PF. It begs the question was radar altimeter planned to be used and if so when? Even though there are some transmissions stepped on for various reasons, the words runway thirty three were mentioned a number of times. As crossing the threshold to runway 33 posed a significant risk to PAT 25 I would have thought the PAT 25 crew, to know from experience, that in 3 to 4 minutes from the time ATC reported the CRJ crossing the bridge the CRJ would pass directly in front of them at or near the same altitude. It's not clear to me why PAT 25 would not have reduced airspeed and or held at HAINS point. I belive the simultaneous helicopter and runway 33 operations should never have been permitted. Clearance limits and expected further clearance times mirroring the ETA for rwy 33 given to helicopters to arrive at or hold at HAINS point would have be helpful in preventing conflicts. Subjects
ATC
CRJ
FAA
Night Vision Goggles (NVG)
Radar
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| Someone Somewhere
February 17, 2025, 06:24:00 GMT permalink Post: 11829650 |
So this just cracks me up. He's in the middle of the river where the route says it's up the East bank, and that's OK because the routes are not defined with no procedural separation from landing traffic. He's instructed to pass behind the CRJ, but that would involve him either holding short or deviating over the city at 200ft at night, but instead he chooses to plow right on. The helicopter is out of his standard altitude, and the jet is way above the glideslope, and ATC encourages them to sort it out themselves. And the helicopter crew are wearing NVGs. What could possibly go wrong.
You could reasonably define the bank as the water's edge, and therefore expect crews to fly along an infinitesimally narrow path. Or as the space between the water's edge and the [edge of the flood plain | first flat area | something else], which would imply that the western boundary changes with the water level. Both imply the route is substantially above land. Neither are useful for precise navigation, but the map and the description are probably 'close enough' if they are only needed for general route guidance and knowing that structures on the east bank need to be NOTAMed for helicopters, but probably not the west bank. A good reminder that measurements/specifications without tolerance are often worse than useless. If it quacks like a duck... this kind of "It can't be an X because we can't do it, so we'll call it a Y" leads to a culture that gets used to massaging the truth for convenience. Did we hear more on the Alaska door plug that was an 'opening' not a 'removal'? Subjects
ATC
CRJ
DCA
FAA
KDCA
NTSB
Night Vision Goggles (NVG)
Pass Behind
Pass Behind (All)
Separation (ALL)
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| ATC Watcher
February 17, 2025, 08:38:00 GMT permalink Post: 11829705 |
safety is our number one priority'
As many and I said before, discussion about Altimeters or width of VFR routes are just distractions to deflect from the real cause , which for me can be resumed into the lack of a safety assessment and safety case of existing procedures. We all had to do this when SMS was widely introduced in the late 90s It was not that easy , but we discovered a few holes that were closed. Here in DCA we see a couple of procedures that would not have passed a safety case : e.g Route 4, Circling to RWY 33 with that route active, visual separation at night , use of NVG on that route ..etc,, Flying in itself always bares a risk,, our job is to minimize the risk , not to eliminate it , but here the Regulatory ( i.e FAA) failed to minimize the risks. As in the US the FAA is both the service provider and the Regulator , and is in addition dependent of political will and pressure for its funding , the willingness to implement unpopular measures, may be limited. A Judge might look into this differently but for those part of the discussion I hand over the floor to .Willow run 6-3 . Subjects
DCA
FAA
Night Vision Goggles (NVG)
Route 4
Separation (ALL)
VFR
Visual Separation
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| Wide Mouth Frog
February 17, 2025, 15:07:00 GMT permalink Post: 11829956 |
The debate about how the altimeters could have been calibrated wrong seems like they are looking for an excuse that most pilots won’t believe.
Last edited by Wide Mouth Frog; 17th February 2025 at 15:28 . Subjects
ATC
FAA
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| WillowRun 6-3
February 17, 2025, 15:50:00 GMT permalink Post: 11829979 |
This just a catchy phrase to make passengers comfortable, just like the : " Staff are the most important asset of our company " on can see in the reception hall of many companies nowadays . The shareholders must be smiling a bit when passing thought those banners...
As many and I said before, discussion about Altimeters or width of VFR routes are just distractions to deflect from the real cause , which for me can be resumed into the lack of a safety assessment and safety case of existing procedures. We all had to do this when SMS was widely introduced in the late 90s It was not that easy , but we discovered a few holes that were closed. Here in DCA we see a couple of procedures that would not have passed a safety case : e.g Route 4, Circling to RWY 33 with that route active, visual separation at night , use of NVG on that route ..etc,, Flying in itself always bares a risk,, our job is to minimize the risk , not to eliminate it , but here the Regulatory ( i.e FAA) failed to minimize the risks. As in the US the FAA is both the service provider and the Regulator , and is in addition dependent of political will and pressure for its funding , the willingness to implement unpopular measures, may be limited. A Judge might look into this differently but for those part of the discussion I hand over the floor to .Willow run 6-3 . This is an excerpt from a website of an actually well-known, very accomplished, and respected group of lawyers who specialize in (among other things) aviation matters. I'm not using their name and I don't have any approval, express or implied, to use information from their website - but if justice is to be sought for the victims' families, public discussion is - or should be - encouraged. "A discretionary function is an action of a governmental nature exercised by a federal employee, but in order for that action to be considered a discretionary function, it must pass a two-part test: There must be an element of judgment or choice. That is, if a federal statute or regulation prescribes a course of action for an employee to follow, there is no discretion. That judgment or choice must be susceptible to policy analysis. The Federal Tort Claims Act contains a discretionary function exception that says the U.S. cannot be held liable for any employee\x92s failure to exercise or perform a discretionary duty. Within the legal field of aviation accidents, discretionary duties for which the U.S. is not liable include the following: Aircraft \x93spot check\x94 certifications Weather forecasting Failure to install equipment The FAA\x92s design of flight procedures The types of actions that are considered not discretionary, and therefore, open the U.S. government to litigation are: The failure to issue air traffic control manual warnings If air traffic control fails to warn of weather dangers The failure to maintain equipment Relaying incorrect instructions to pilots." END OF EXCERPT [not intended as legal advice here or on its original internet page] So to return to ATC Watcher's point...... the more posts I read about this midair collision (plus other information such as NTSB briefings) the more I am anticipating that it will require an act of Congress to provide for compensation for the families of the victims. Isn't it the obvious fact that convenience for people who work in Washington and travel "back home" generally speaking on weekends and when Congress isn't convened, is a prime and central reason for the way DCA airspace has been constructed and managed? Is it really going to be the case that because the lawsuits will - in all likelihood - fail to overcome the "discretionary function" exception, that the 67 families will be without a remedy? Is that how it works, then? In case anyone thinks my sense of being horrified at this accident is clouding reason or logic, consider this - the book Collision Course discusses the PATCO union's genesis, the strike, and so on. PATCO's earliest stirrings resulted in large part from the 1960 midair over New York. Is the United States aviation sector willing to accept an outcome of this accident that in effect travels back over six decades? The point is, given the long-term shortage of ATCOs in this country . . . I don't think a court is capable of ruling that the situation, allowed and in fact enabled by Congress and successive White House presidential administrations, is subject to "negligence" analysis in the currently applicable legal sense. All this being said, this is how I arrive at thinking that in the interests of justice, some other means of providing for the loved ones of 67 souls who were on board needs to be determined and implemented. Last edited by WillowRun 6-3; 17th February 2025 at 19:11 . Subjects
ATC
DCA
FAA
NTSB
Night Vision Goggles (NVG)
Route 4
Separation (ALL)
VFR
Visual Separation
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| ATC Watcher
February 17, 2025, 21:32:00 GMT permalink Post: 11830196 |
@ Fullwings
:
No rotary pilot I know would knowingly pass that close under/behind a jet transport as the wake could literally be the end of you at 200’AGL.
@ Lascaille :
​​​​​​​
I very strongly doubt that the US govt would do a 'technically we're immune so tough luck' here. The optics would be dire.
Here if you want to learn or just refresh your memory ; https://www.latimes.com/archives/la-...%20government. As an aside , the NTSB conclusions of that collision are interesting compared to our DCA accident : ( exactly 40 years ago !)
​​​​​​​The NTSB determined
"that the probable cause of the accident was the limitations of the air traffic control system to provide collision protection, through both air traffic control procedures and automated redundancy."In addition to the inadvertent and unauthorized entry of the PA-28 into the LA Terminal Control Area, another factor at play was the limitations of the "see and avoid" concept to ensure traffic separation.
Subjects
ATC
DCA
FAA
NTSB
Probable Cause
Route 4
See and Avoid
Separation (ALL)
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| Chu Chu
February 18, 2025, 01:04:00 GMT permalink Post: 11830382 |
I wasn't insinuating that -- or really trying to be clever, either. I should have said this more directly, but the legal defenses that might be available with respect to the FAA's actions almost certainly won't apply to the Blackhawk crew. And the Government won't pay twice for the same accident in any event. So if the Blackhawk crew was negligent, which I have to say seems likely, the FAA's possible defenses are pretty much irrelevant.
Subjects
Blackhawk (H-60)
CRJ
FAA
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| WillowRun 6-3
February 18, 2025, 03:01:00 GMT permalink Post: 11830431 |
I wasn't insinuating that -- or really trying to be clever, either. I should have said this more directly, but the legal defenses that might be available with respect to the FAA's actions almost certainly won't apply to the Blackhawk crew. And the Government won't pay twice for the same accident in any event. So if the Blackhawk crew was negligent, which I have to say seems likely, the FAA's possible defenses are pretty much irrelevant.
But, you're asserting that the Army can be sued - it's covered by the Federal Tort Claims Act, as far as I know. Which is to say it will be claimed that the Army as an organization, and perhaps the pilots, were negligent. There isn't a separate exception to the FTCA's immunity waiver for the military in general although there is an exception for combatant activities in time of war (not applicable, right?). But not so fast. The operation of training and/or check rides for VIP transport- especially as related to continuity of government operations - carries lots of policy judgments. It could be a more intense legal fight than scoring the FAA for favoring traffic capacity over stricter safety rules. For one thing, the continuity of government stuff probably is largely meant to be kept out of the public record, making litigation involving it more challenging. Subjects
Blackhawk (H-60)
FAA
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| truckflyer
February 18, 2025, 08:00:00 GMT permalink Post: 11830516 |
Playing Devil's Advocate for a moment, if the heliroutes are published for the common sense use of participants, not for the protection of air transport, and we further accept that it is not within the purview of ATC to question the discretion of willing users, I'm afraid we can only fall back on this accident being the sole responsibility of the helicopter. Which I guess is is another way of re-stating your last post.
I wouldn't put it past the FAA to pull a stunt like that, read Mary Schiavo's (ex IG of the Dept. of Transportation) book if you want to know how wily they can be. And Jennifer gave them the perfect lay up in the last briefing. It's way to easy to blame the pilots, over the years there have been incidents due to incorrect QNH settings, were both pilots and ATC have failed to catch the error, in a busy airspace with overworked ATC, late change of runway for airlines, and military helicopters using Night Vision Goggles, altimeter equipment failure/error. Even the Max 200 ft altitude under the approach to a major US airport is an accident waiting to happen, and whoever approved this to be used during normal operations should be investigated. The CRJ was at around 325 ft on a visual/circling approach when it crashed, does anyone really think it's great airmanship to have a Black Hawk helicopter at 200 ft passing under you? That's what made the Swiss Cheese model line up perfectly, a planned approved separation of 125 ft was the "best case" scenario. Subjects
ATC
Accident Waiting to Happen
Blackhawk (H-60)
CRJ
FAA
QNH
Separation (ALL)
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| Wide Mouth Frog
February 18, 2025, 12:39:00 GMT permalink Post: 11830705 |
But, who exactly are the “knuckleheads” ? To my mind, they are the officials who approved these routes & procedures. Would you agree ? Others (ATC & pilots) might have made contributory errors, but the situation was orchestrated by those who designed & allowed the procedures. Correct ?
I've asked a question over on Rotorheads to see if anyone knows the actual clearance and service given to helicopters entering the DCA Class Bravo on the 'routes', and I'm happy to repeat it here. In London it's Radar Control ie. separation provided by ATC supported by radar. That's one part of the picture. The other is this startling revelation from Jennifer Homendy that there are no lateral limits to the 'routes', so in one sense they are not really 'routes' at all just guidelines with defined altitude limits. I can't find even altitude limits on the NY and Boston charts. In other words, the way the 'routes' are used is quite possibly defined locally by custom and practice rather than designed with safety baked in by the authority, and that may be the way the authority intended things to be. In the UK every towered field has its own safety management system, as does the CAA. If these exist here at DCA and the FAA it would be instructive to have those examined as part of the investigation, because either they are not being used, or they're being ignored. Nobody could maintain that the risks on this 'route' were As Low As Reasonably Practicable (ALARP). Last edited by Wide Mouth Frog; 18th February 2025 at 13:16 . Subjects
ATC
DCA
FAA
NTSB Chair Jennifer Homendy
Radar
Separation (ALL)
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| Lonewolf_50
February 18, 2025, 18:00:00 GMT permalink Post: 11830924 |
I should have said this more directly, but the legal defenses that might be available with respect to the FAA's actions almost certainly won't apply to the Blackhawk crew.
And the Government won't pay twice for the same accident in any event. So if the Blackhawk crew was negligent, which I have to say seems likely, the FAA's possible defenses are pretty much irrelevant. Subjects
Blackhawk (H-60)
FAA
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| HaroldC
February 18, 2025, 22:45:00 GMT permalink Post: 11831083 |
Indeed , and there is a precedent : the 1986 Cerritos collision : the NTSB found no responsibility to ATC as the pilot of the PA28 that hit the DC9
had entered Los Angeles Terminal Control Area airspace without the required clearance.
However a judge found the FAA partly responsible to make sure the families of the pax , mostly Mexicans , would be compensated , as the responsible private pilot's wealth would not have been able to cover those.
Subjects
ATC
FAA
NTSB
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| remi
February 19, 2025, 04:53:00 GMT permalink Post: 11831215 |
An interesting point. But, consider first how frequently on this forum posters have observed that the FAA (and Congress) have favored higher capacity of operations over stricter safety-related operational procedures. It has been noted on many threads about many incidents. So - while admitting there could be legal reasoning that has eldued me - the presence of policy judgments in the FAA situation looks pretty strong, and very likely preclusive.
Subjects
Close Calls
FAA
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| ATC Watcher
February 22, 2025, 09:48:00 GMT permalink Post: 11833528 |
I can think of one: you apply IFR separation standards (the minimum in the US is 1.5nm/500’?), at least for night operations. If two routes come closer to each other than that in either dimension, e.g. DCA RW33 approach and helicopter route 1, then traffic must be actively kept apart.
Subjects
ATC
DCA
FAA
ICAO
IFR
Separation (ALL)
VFR
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| Easy Street
February 22, 2025, 11:12:00 GMT permalink Post: 11833584 |
I can think of one: you apply IFR separation standards (the minimum in the US is 1.5nm/500\x92?), at least for night operations. If two routes come closer to each other than that in either dimension, e.g. DCA RW33 approach and helicopter route 1, then traffic must be actively kept apart
However, from a US point of view, this is arguably the solution which was in place on the night. It's just that the means of actively keeping the traffic apart, ie visual separation, failed. I am prepared to accept that FAA-style "visual separation" is slightly more robust than "see and avoid" in that it requires ATC to confirm that the pilot has the specific traffic in sight before relaxing separation minima, but the question for the FAA is whether "slightly more robust" is good enough when airliners are involved, particularly at night given the increased potential for misidentification. I am not sure the subsequent line of discussion over how Class B requires ATC (not pilots) to separate all traffic is a very productive one. Any separation instruction given by ATC relies upon the pilot executing it, for instance by maintaining the cleared altitude. Here, it relied on the pilot not colliding with the specific traffic he had confirmed visual contact with. So far as the FAA is concerned, that's a sufficient degree of control and differs from the "see and avoid" principle applicable to VFR/VFR in Class C, and VFR/Any in Class D. Again, the question is whether that's appropriate. That last point gives me an opportunity to make an observation I've been pondering for a while. Many European airport control zones are Class D, where on a strict reading of ICAO, VFR traffic is not required to be separated from IFR. But how many of us know a Class D zone where the controller gives traffic information and lets VFR traffic merge with IFR under see and avoid? In practice, European and especially UK ATC exercise a greater degree of control than is strictly required by the ICAO classification. At least in my experience, US airspace is operated closer to ICAO specifications ("visual separation" nothwithstanding). Last edited by Easy Street; 22nd February 2025 at 11:31 . Subjects
ATC
DCA
FAA
ICAO
IFR
See and Avoid
Separation (ALL)
Traffic in Sight
VFR
Visual Separation
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| Wide Mouth Frog
February 22, 2025, 11:14:00 GMT permalink Post: 11833589 |
I'm sure it does, but UK helimeds use the suffix to indicate they are actually on a shout, rather than training or positioning.
Caley's Coachman:
My apologies, I tend to regard the conversation here as being reflective of the lounge bar rather than the witness box. You're right, 'recommends' is a better word and I will try to be more pedantic.
I personally don't think there's anything to be gained from going down the ICAO route. The NTSB has it's own charter and that's what dictates what happens in the USA. I can see several ways the NTSB could take this, first the obvious one. The helicopter assumed responsibility for separation when it was not able to do so, and then found itself on track for collision. That's what I would define as true proximate cause. Then there's a step back from there which says nobody should be allowed to request and receive visual separation responsibilities in Class B airspace. That would be a good result as far as I'm concerned. And the final step, which I think is more contentious and really hard for the US to accept, is that the culture at the FAA and within the industry is to balance safety and boosterism for the industry, and I think that is a recipe for irreconcilable conflicts. I'm not holding my breath on that one.
Easy Street:
I am not sure the subsequent line of discussion over how Class B requires ATC (not pilots) to separate all traffic is a very productive one. Any separation instruction given by ATC relies upon the pilot executing it, for instance by maintaining the cleared altitude. Here, it relied on the pilot not colliding with the specific traffic he had confirmed visual contact with. So far as the FAA is concerned, that's a sufficient degree of control and differs from the "see and avoid" principle applicable to VFR/VFR in Class C, and VFR/Any in Class D. Again, the question is whether that's appropriate.
Last edited by Wide Mouth Frog; 22nd February 2025 at 11:49 . Reason: Adding response to Easy Street Subjects
ATC
FAA
ICAO
NTSB
See and Avoid
Separation (ALL)
Visual Separation
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