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Atlas 747 Landing Incident - Shanghai

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Atlas 747 Landing Incident - Shanghai

Old 6th Aug 2020, 18:02
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Atlas 747 Landing Incident - Shanghai

Date: 04-AUG-2020
Time: 18:05:00Z
Regis#: N408MC
Serial#: 29261
Aircraft Make: BOEING
Model: 747-47UF
Flight#: Atlas Air 8939
Type: INCIDENT
Highest Injury: NONE

AIRCRAFT SUFFERED POD STRIKES TO THE #1, #2 AND #4 ENGINES ON LANDING, SHANGHAI, CHINA. (PVG)
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Old 6th Aug 2020, 18:28
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Atlas Air on behalf of DHL
Seoul to Shanghai Pudong
Pod Strikes on Landing rwy 17R
No further incident during rollout

19013G20MPS 8000 -SHRA
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Old 6th Aug 2020, 18:37
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It must have been a REALLY dynamic landing (lots of roll rate) to get #2!
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Old 7th Aug 2020, 00:34
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More at: Incident: Atlas B744 at Shanghai on Aug 5th 2020, triple engine pod strike
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Old 7th Aug 2020, 01:41
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The report says:

The aircraft rolled out without further incident
Considering the pod strikes, I can't help wondering if the roll out was on the runway, or the roll axis!
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Old 7th Aug 2020, 03:48
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I'll be interested to see what dynamics led to an inboard pod strike.

Seems like the outboard would act as a pogo wheel to hold the inner engine off the ground - but I guess wing flex, or gear flex, or extreme damage to the outboard, or a semi-excursion such that the #2 hit an edge light, each could explain it.
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Old 7th Aug 2020, 04:53
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Is it just me or is the incident rate higher than normal with a small fraction of the normal flying?
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Old 7th Aug 2020, 08:02
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I can't see this staying classified as an "incident" (per Annex 13) for long ...

Originally Posted by pattern_is_full View Post
Seems like the outboard would act as a pogo wheel to hold the inner engine off the ground - but I guess wing flex, or gear flex, or extreme damage to the outboard, or a semi-excursion such that the #2 hit an edge light, each could explain it.
The 747's geometry is such that a combination of wing flex (particularly if an outer engine is already in contact with the ground), and/or wing gear oleo compression, doesn't leave much clearance between the runway and the inner on the same side at best:



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Old 7th Aug 2020, 11:38
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Here is a little aviation news letter that I subscribe to.

https://simpleflying.com/atlas-air-7...ne-strike/amp/
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Old 7th Aug 2020, 12:29
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I no longer have the Boeing equivalent of the POH for the -400 with me, it has been a few years since I flew them, but I seem to remember it had a diagram showing the roll and pitch angles and oleo compressions for particular pod strikes.

What struck me at the time and is apparent here is that at a certain roll angle and nose down pitch (7 and 3 degrees?, my memory fails me) it was the inboard pods that struck before the outboards with full oleo compression. The rate of descent for full oleo compression was not stated but would have been near the limit, around 600fpm.

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Old 7th Aug 2020, 14:32
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the aircraft suffered engine pod strikes on the #1, #2 and #4 engines (outboard left, inboard left, outboard right). The aircraft rolled out without further incident.
To strike double pods on one and the other side outer takes some doing. What further could happen?
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Old 7th Aug 2020, 15:08
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It must have been similar and worse than this:
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Old 7th Aug 2020, 19:57
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anxiao

you are correct, it was like that on the 747-2 and the 747-4 , our airline always focused on roll angle control since they had a pod strike incident long time ago. 7-8 degrees roll looks like a lot from the cockpit but it can happen quick. I rather landed crabbed wings level during wet strong xwind landings than trying to de-crab. The gear takes it easily, unlike eg an MD11(i have flown those 3 types, no arm chair)
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Old 7th Aug 2020, 22:47
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Originally Posted by anxiao View Post
What struck me at the time and is apparent here is that at a certain roll angle and nose down pitch (7 and 3 degrees?, my memory fails me) it was the inboard pods that struck before the outboards with full oleo compression.
Well remembered.


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Old 7th Aug 2020, 23:15
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Originally Posted by Australopithecus View Post
Is it just me or is the incident rate higher than normal with a small fraction of the normal flying?
Not just you. Common theme on the WhatsApp Groups for the grounded / part-time / pay cut / survived the latest round of dismissals colleagues.
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Old 8th Aug 2020, 14:36
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Haven’t seen the 3rd quarter numbers but Atlas was running about 10 extra sections a day during the 2nd quarter. While passenger operations have suffered during this outbreak the cargo world has gone crazy.
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Old 8th Aug 2020, 17:24
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anxiao and DaveReidUK - yes, thanks. As I suspected. Ain't 3D trigonometry wonderful!
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Old 9th Aug 2020, 01:38
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I thought it was geometry
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Old 9th Aug 2020, 02:12
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Nothing so cerebral. It was playing with my -400 Manila model on a table top that set me searching for the answer
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Old 9th Aug 2020, 05:52
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Not often that you see that much rudder deflection on a jet.
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