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-   -   Atlas 747 Landing Incident - Shanghai (https://www.pprune.org/rumours-news/634606-atlas-747-landing-incident-shanghai.html)

Three Lima Charlie 6th Aug 2020 17:02

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)

Ray_Y 6th Aug 2020 17:28

Atlas Air on behalf of DHL
Seoul to Shanghai Pudong
Pod Strikes on Landing rwy 17R
No further incident during rollout

19013G20MPS 8000 -SHRA

Intruder 6th Aug 2020 17:37

It must have been a REALLY dynamic landing (lots of roll rate) to get #2!

Longtimer 6th Aug 2020 23:34

More at: Incident: Atlas B744 at Shanghai on Aug 5th 2020, triple engine pod strike

Pilot DAR 7th Aug 2020 00:41

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!

pattern_is_full 7th Aug 2020 02:48

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.

Australopithecus 7th Aug 2020 03:53

Is it just me or is the incident rate higher than normal with a small fraction of the normal flying?

DaveReidUK 7th Aug 2020 07:02

I can't see this staying classified as an "incident" (per Annex 13) for long ...


Originally Posted by pattern_is_full (Post 10855016)
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:

https://cimg5.ibsrv.net/gimg/pprune....9acb55c844.jpg


Pugilistic Animus 7th Aug 2020 10:38

Here is a little aviation news letter that I subscribe to.

https://simpleflying.com/atlas-air-7...ne-strike/amp/

anxiao 7th Aug 2020 11:29

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.


vilas 7th Aug 2020 13:32

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?

Banana Joe 7th Aug 2020 14:08

It must have been similar and worse than this:

Havingwings4ever 7th Aug 2020 18:57

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)

DaveReidUK 7th Aug 2020 21:47


Originally Posted by anxiao (Post 10855275)
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.
https://cimg8.ibsrv.net/gimg/pprune....bfb7acbfb5.jpg


DCS99 7th Aug 2020 22:15


Originally Posted by Australopithecus (Post 10855035)
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.

MarkerInbound 8th Aug 2020 13:36

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.

pattern_is_full 8th Aug 2020 16:24

anxiao and DaveReidUK - yes, thanks. As I suspected. Ain't 3D trigonometry wonderful!

lomapaseo 9th Aug 2020 00:38

I thought it was geometry :)

anxiao 9th Aug 2020 01:12

Nothing so cerebral. It was playing with my -400 Manila model on a table top that set me searching for the answer :)

Check Airman 9th Aug 2020 04:52

Not often that you see that much rudder deflection on a jet.


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