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DHL Boeing 757/200 emergency in Costa Rica...

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DHL Boeing 757/200 emergency in Costa Rica...

Old 8th Apr 2022, 07:57
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Braking seems fine, going by the skid marks left behind. Seems like the loss of directional control. Not sure why it wasn’t slowing, clearly had anti-skid issues. They had quite a bit of runway left.

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Old 8th Apr 2022, 10:22
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DHL Panama.
Their 757s have Pratt & Whitney engines.
Unclear from the video, given that it was filmed from the left side, if they were using the Right Engine Reverser during the landing rollout. Does not look like that they used the Left Engine Reverser. Not very familiar with this engines.
Can see as plausible cause that they might have used the Right Reverser, and did not stow it as the aircraft slowed down to slower airspeeds. Can see that as a plausible reason to explain the loss of directional control the way they did.
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Old 8th Apr 2022, 11:33
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On a dry runway there is zero issue with using one reverser and directional control. It’s done all the time in normal ops with a reverser locked out. Unless they lost both left and right hydraulic systems braking will be normal. I can’t remember which ones but some spoilers are inop and if I recall you land flaps 20. Easy to float if your not careful. It did not appear either reverser was deployed but stopping should still not be a issue.
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Old 8th Apr 2022, 12:05
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I just had this exact scenario at my yearly checkride. Loss of the left Hydraulic system, run a few checklists, land straight ahead, asymmetric reverser, but a non-event. No nosewheel steering so you’ll need a tow from the runway.
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Old 8th Apr 2022, 12:44
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There is or was an item in B757 QRH for loss of left hydraulics that stated: DO NOT USE AUTOBRAKES. Not saying that is the case here but if they did it can seriously impair directional control as A/B can only give symmetrical braking.. A B757 left the runway in LGW (Gatwick) many years ago as a direct result of this, Airtours I think. Basically with asymmetric reverse any yawing moment can be exacerbated by brakes on one side releasing due to increased lift on one wing and this just multiplies, especially if any crosswind (which appears not the case here) and also if for any reason speed brake not rapidly deployed.
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Old 8th Apr 2022, 13:33
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Originally Posted by Terrey View Post
Landed with a 10kt tailwind, partial flap (Hyd Sys L) , 3000’ elevation and heavy weight. Not surprising they were running out of runway. Landed Rwy07, wind 250/10. Only circling approach available Rwy25 with a displaced threshold. Probably should have looked at going somewhere else.
Terrey,
Is there reliable information that this aircraft was at a heavy weight?

Thanks.
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Old 8th Apr 2022, 14:10
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Originally Posted by andrasz View Post
They had another 1000m of surfaced area ahead, more likely it was a loss of directional control. Rudder was deflected left throughout the landing roll.
If the rudder was left throughout the landing roll it is possible the loss of the Left system caused a NWS issue with a drift to the right. At higher speeds the rudder could compensate but below 80 knots would be ineffective leaving only differential braking.
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Old 8th Apr 2022, 14:54
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Originally Posted by Starbear View Post
There is or was an item in B757 QRH for loss of left hydraulics that stated: DO NOT USE AUTOBRAKES. Not saying that is the case here but if they did it can seriously impair directional control as A/B can only give symmetrical braking.. A B757 left the runway in LGW (Gatwick) many years ago as a direct result of this, Airtours I think. Basically with asymmetric reverse any yawing moment can be exacerbated by brakes on one side releasing due to increased lift on one wing and this just multiplies, especially if any crosswind (which appears not the case here) and also if for any reason speed brake not rapidly deployed.
This bought about the procedure to make sure that the Speedbrakes had fully deployed BEFORE using any asymmetric reverse thrust back in the day, so if the Checklist had been fully followed, that was in the "beware" notes.
In the video, you can see the speedbrakes extended but obviouly not all of them due to the Hydraulic failure
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Old 8th Apr 2022, 15:44
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Correct. In fact the speedbrake requirement was in force for the LGW event but that airline omitted that very important point in their own company modified QRH
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Old 8th Apr 2022, 17:43
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Originally Posted by Terrey View Post
Landed with a 10kt tailwind, partial flap (Hyd Sys L) , 3000’ elevation and heavy weight. Not surprising they were running out of runway. Landed Rwy07, wind 250/10. Only circling approach available Rwy25 with a displaced threshold. Probably should have looked at going somewhere else.
Shame you weren't there Terrey to save the day . . . . .
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Old 8th Apr 2022, 18:12
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Originally Posted by Sailvi767 View Post
If the rudder was left throughout the landing roll it is possible the loss of the Left system caused a NWS issue with a drift to the right. At higher speeds the rudder could compensate but below 80 knots would be ineffective leaving only differential braking.
Sailvi767,
the nosewheel steering is inop with loss of left hydraulics, so even if rudder trim is used, I’m pretty sure it won’t affect nosewheel steering at all.
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Old 8th Apr 2022, 20:35
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Perhaps the answer lies with why the loss of left hyd sys. Maybe whatever took out the left hyd sys also caused a loss of integrity to the right hyd sys or even the right or left bogie's brakes. It's been a while since I worked the 757. My knowledge is a bit rusty.
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Old 8th Apr 2022, 20:47
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Whatever happened, if it wasn't for these treacherous 5m. terrain level differences within less than 50m from the high-speed exit taxiway, there would only have been a pretty much intact 757 standing in the mud.
If this would have been a high-speed RTO full of pax, veering off the rwy, these 'slopes' could have killed a lot of people...

Last edited by DIBO; 8th Apr 2022 at 21:46. Reason: typo
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Old 8th Apr 2022, 21:19
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Originally Posted by Chiefttp View Post
Sailvi767,
the nosewheel steering is inop with loss of left hydraulics, so even if rudder trim is used, I’m pretty sure it won’t affect nosewheel steering at all.
Not necessarily - I have had a Left Hydraulic fail on a B757 and retained about 14% HYD in the Left system due to the standpipe. This 14% was enough to retain full control of the NWS and taxi clear of the runway.

As mentioned earlier, the B757 incident at London Gatwick some years ago, where the operator thought they knew better than Boeing and modified their QRH for Left HYD system failure, meant that the ABS was incorrectly selected for landing. The aircraft lost control directionally when THR RVR was selected and the aircraft departed the paved surface then regained it after a while.

It appears similar to this event (no ditches at the side of Gatwick’s runway!).

Last edited by Cuillin Hills; 8th Apr 2022 at 21:49.
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Old 9th Apr 2022, 00:00
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Originally Posted by Chiefttp View Post
Sailvi767,
the nosewheel steering is inop with loss of left hydraulics, so even if rudder trim is used, I’m pretty sure it won’t affect nosewheel steering at all.
Not at all what I meant. There may have been a failure in the NWS system that without hydraulic power was causing a right drift. One poster stated that they had left rudder in from touchdown. If that was the case they either had a Nose gear issue or asymmetric braking.
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Old 9th Apr 2022, 02:32
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Several more videos in AmuDarya’s linked Reddit page above.
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Old 9th Apr 2022, 03:35
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Originally Posted by Cuillin Hills View Post
Not necessarily - I have had a Left Hydraulic fail on a B757 and retained about 14% HYD in the Left system due to the standpipe. This 14% was enough to retain full control of the NWS and taxi clear of the runway.

As mentioned earlier, the B757 incident at London Gatwick some years ago, where the operator thought they knew better than Boeing and modified their QRH for Left HYD system failure, meant that the ABS was incorrectly selected for landing. The aircraft lost control directionally when THR RVR was selected and the aircraft departed the paved surface then regained it after a while.

It appears similar to this event (no ditches at the side of Gatwick’s runway!).
Anybody have a link to a report on the Gatwick incident?
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Old 9th Apr 2022, 04:54
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Originally Posted by punkalouver View Post
Anybody have a link to a report on the Gatwick incident?
There is this... https://assets.publishing.service.gov.uk/media/5422f0b6e5274a1317000327/dft_avsafety_pdf_501194.pdf

with an interesting comment on nationwide QRH custom.
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Old 9th Apr 2022, 07:51
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Originally Posted by Sailvi767 View Post
If the rudder was left throughout the landing roll it is possible the loss of the Left system caused a NWS issue with a drift to the right. At higher speeds the rudder could compensate but below 80 knots would be ineffective leaving only differential braking.
An interesting point that may explain part of the rather sudden move to the right,

​​​​​andrasz too
after the stop the rudder is still deflected left,

also interesting too see the complete wrinkle/harmonica visible both before and aft of the wing, which may point to the production break locations, and ripping the fuselage open in the middle of the aft section, could point to wingtip touching ground first (ac pivoting on the NLG) causing the wrinkles, and ripping occurring when the horizontal stabiliser hit the ground, I wonder, quite a big dip there,
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Old 9th Apr 2022, 12:01
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Wasn’t there a 757 accident in Guyana two or three years ago where there was a hydraulic problem. Could be an interesting comparison if someone has details.
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