Ryanair landing gear penetrates wing
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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 When the gear was retracted after takeoff from Hahn, it penetrated the wing.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
Never seen anything like this before?
https://avherald.com/h?article=4c381cd8&opt=0
The failure mode looks very similar to this Jet Airways B738 in April 2015:
Though presumably the cause of that one
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
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."
Investigation Report on Jet Airways B 737-800 Aircraft involved in landing gear collapse due improper overhaul of trunnion pins
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?
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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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.
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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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?
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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" 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 .
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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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?
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?
More pictures:
https://www.flugzeugforum.de/threads.../#post-2605198
https://www.flugzeugforum.de/threads.../#post-2605198
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Honeycomb material it broke through cannot withstand significant load hence the No Step warning shown in some pictures.
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.
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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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?
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?
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.
http://www.sweethaven02.com/Aviation...k/ama_Ch13.pdf
