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Ryanair landing gear penetrates wing

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Ryanair landing gear penetrates wing

Old 30th Jan 2019, 07:12
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Ryanair landing gear penetrates wing

As reported by Aviation Herald. When the gear was retracted after takeoff from Hahn, it penetrated the wing. Aircraft returned for a safe landing.
Never seen anything like this before?

https://avherald.com/h?article=4c381cd8&opt=0
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Old 30th Jan 2019, 07:31
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Originally Posted by ManaAdaSystem View Post
Never seen anything like this before?
The failure mode looks very similar to this Jet Airways B738 in April 2015:



Though presumably the cause of that one

"The LH Aft landing Gear trunnion pin failed due to overload following fatigue growth. Crack initiation was in the heat affected area where excessive grinding was done at the time of overhaul. Initial crack growth is charterized by intergranular cracking (assisted by hydrogen embrittlement mechanism) until fatigue took over."
doesn't apply to a 4-month-old aircraft.

Investigation Report on Jet Airways B 737-800 Aircraft involved in landing gear collapse due improper overhaul of trunnion pins
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Old 30th Jan 2019, 07:53
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Can a trunnion pin failure prevent you from lowering the landing gear in this situation?
I’m no expert on landing gear bits and pieces, but this is a major failure.
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Old 30th Jan 2019, 12:19
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From the photos and report on AVH it is clear that the actuator atachment failed, NOT the gear attachment. As for 'penetrating' the wing, no it didn't, the mechanism is already inside the wing, and the only item damaged was a non-structural composite access panel on the wing upper surface. Not supposed to happen on a 4 month old aircraft though...

What I would be more interested though is what kind of indications were the crew faced with, as this happened during retraction, and how did they ensure that it was down and locked for a landing?
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Old 30th Jan 2019, 16:30
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Duh a wing is a wing and part of its upper surface was penetrated, access panel or no access panel.
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Old 30th Jan 2019, 17:43
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By not penetrating the wing he meant structural portion of the wing. Honeycomb material it broke through cannot withstand significant load hence the No Step warning shown in some pictures. Has been reported by mechanics the bolt falling out is not an unknown problem, probably due to improper installation. Considering the age I would first think factory assembly defect.
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Old 30th Jan 2019, 20:00
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Originally Posted by NWA SLF View Post
By not penetrating the wing he meant structural portion of the wing. Honeycomb material it broke through cannot withstand significant load hence the No Step warning shown in some pictures. Has been reported by mechanics the bolt falling out is not an unknown problem, probably due to improper installation. Considering the age I would first think factory assembly defect.

Sounds no different than a compound fracture of your leg
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Old 30th Jan 2019, 20:45
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Originally Posted by lomapaseo View Post
Sounds no different than a compound fracture of your leg
Well, with a compound fracture of your leg, you're probably going to fall down....

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Old 31st Jan 2019, 07:07
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Originally Posted by andrasz View Post
From the photos and report on AVH it is clear that the actuator atachment failed, NOT the gear attachment. As for 'penetrating' the wing, no it didn't, the mechanism is already inside the wing, and the only item damaged was a non-structural composite access panel on the wing upper surface. Not supposed to happen on a 4 month old aircraft though...

What I would be more interested though is what kind of indications were the crew faced with, as this happened during retraction, and how did they ensure that it was down and locked for a landing?
Those arrows indicate where you walk when you evacuate over the wing?
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Old 31st Jan 2019, 07:37
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Yes, they do.
They also indicate the airflow
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Old 31st Jan 2019, 07:46
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" Has been reported by mechanics the bolt falling out is not an unknown problem"

I worked on 737"s for 41 years, never saw a bolt fall out of a gear actuator or walking beam.
I have seen broken parts .
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Old 31st Jan 2019, 07:53
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Can we plaese discuss the issue here? We have parts of the landing gear on one of the most popular airlines penetrating the wing SURFACE during retraction.
In the Jet Airways case, the trunnion pin failed, Andrasz claims this can also happen if the actuator attachment fails?
This is not good, and I have never read anything about this in the 20 years I have been flying 737s.
Is it possible to spot this when I do my walk around?
And can I end up with a unsafe gear because of this?

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Old 31st Jan 2019, 08:57
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More pictures:
https://www.flugzeugforum.de/threads.../#post-2605198
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Old 31st Jan 2019, 10:06
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Honeycomb material it broke through cannot withstand significant load hence the No Step warning shown in some pictures.
Half of the damaged portion is over the emergency evac route, so hardly a "no step" area.
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Old 31st Jan 2019, 15:33
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Frangible panels are often fitted above main gears to facilitate easier access for lifting gear in an emergency/accident situation.
I recall from B727 days in the late 1990's an SB to the main gear brought about by migrating pins but this event looks more like a simple missing locking component.
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Old 31st Jan 2019, 20:28
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But isn't this incident totally different from the Jet Airways one in that the Jet Airways gear penetrated the wing
after a landing and during taxi, when the weight of the plane is on the gear, while Ryanair broke through during
simple gear retraction in the air?
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Old 1st Feb 2019, 14:15
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I suspect the part that has failed, become detached, is part of the reaction geometry which allows the retraction actuator to lift the gear up and does not play a part in the locked down operation of the main gear oleo strut.
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Old 1st Feb 2019, 15:56
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Certainly wouldn’t want to viewing that...just before considering the arrival.
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Old 1st Feb 2019, 16:40
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Originally Posted by aeromech3 View Post
I suspect the part that has failed, become detached, is part of the reaction geometry which allows the retraction actuator to lift the gear up and does not play a part in the locked down operation of the main gear oleo strut.
Yes - if I'm not mistaken, this is what can be seen in the photos that are circulating on the Net, poking out through the hole in the wing skin. The clevis appears to have become detached from (I think) a rib-mounted bracket, to which it was presumably pinned or bolted:



http://www.sweethaven02.com/Aviation...k/ama_Ch13.pdf
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