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-   -   Alaska SNA [MLG Failure] (https://www.airlinepilotforums.com/safety/144257-alaska-sna-mlg-failure.html)

Disappointment 08-22-2023 04:24 PM

1 Attachment(s)
Similar thing happened to United in 2019. Even ended up on the left cowling

https://avherald.com/h?article=4d0fa589&opt=0

DarkSideMoon 08-22-2023 04:40 PM


Originally Posted by Disappointment (Post 3686668)
Similar thing happened to United in 2019. Even ended up on the left cowling

https://avherald.com/h?article=4d0fa589&opt=0

Mechanical issue on that one. Interesting.

CousinEddie 08-22-2023 05:44 PM


Originally Posted by DarkSideMoon (Post 3686677)
Mechanical issue on that one. Interesting.


And this one:

http://www.b737.org.uk/incident_vt-jga.htm

nene 08-23-2023 07:13 AM


Originally Posted by CousinEddie (Post 3686701)

Imagine if this leads to a "fleet wide" grounding/inspection of all slightly older 737's gear trunnion bolts. That's gonna be some domestic airline chaos.

at6d 08-23-2023 11:03 AM


Originally Posted by Arctichicken (Post 3686651)
I went back and read your post again. I misread it the first time. My bad.:D

Yeah all good!

Sirius 08-23-2023 12:18 PM

Thank you for sharing I’m on the A320 and never flown a Boeing product. Very hard to judge actual sink rate from the video but from my point of view it looks like a hard landing but nothing that I haven’t seen on the line where the plane was fine afterwards except for some egos.


Originally Posted by Disappointment (Post 3686668)
Similar thing happened to United in 2019. Even ended up on the left cowling

https://avherald.com/h?article=4d0fa589&opt=0


sailingfun 08-23-2023 02:20 PM


Originally Posted by nene (Post 3686911)
Imagine if this leads to a "fleet wide" grounding/inspection of all slightly older 737's gear trunnion bolts. That's gonna be some domestic airline chaos.

A order like that would probably start with something like, “within the next 500 hours of service or 250 landings a trunnion bolt inspection must be conducted”. A Trunnion failure is rarely critical and normally does not cause a complete gear collapse. The landing did not look that hard in the video buts that could be deceptive. The answer to that question however I am sure has already been determined by the FDR. A Trunnion failure also does not normally drive the strut up through the wing. It might be months before the real cause is released. The recent Delta evacuation in Atlanta is rumored to be a hard landing but nothing is out yet.

NVR L8 08-23-2023 03:16 PM


Originally Posted by sailingfun (Post 3687121)
A order like that would probably start with something like, “within the next 500 hours of service or 250 landings a trunnion bolt inspection must be conducted”. A Trunnion failure is rarely critical and normally does not cause a complete gear collapse. The landing did not look that hard in the video buts that could be deceptive. The answer to that question however I am sure has already been determined by the FDR. A Trunnion failure also does not normally drive the strut up through the wing. It might be months before the real cause is released. The recent Delta evacuation in Atlanta is rumored to be a hard landing but nothing is out yet.

A Trunnion failure is exactly what happened to Sun Country in LAS recently….same results.

rickair7777 08-23-2023 04:02 PM


Originally Posted by sailingfun (Post 3687121)
A order like that would probably start with something like, “within the next 500 hours of service or 250 landings a trunnion bolt inspection must be conducted”. A Trunnion failure is rarely critical and normally does not cause a complete gear collapse. The landing did not look that hard in the video buts that could be deceptive. The answer to that question however I am sure has already been determined by the FDR. A Trunnion failure also does not normally drive the strut up through the wing.

Since the trunnion pin thing looks to be associated with a specific refurbishment procedure, presumably they could narrow it down to airframes which had been subject to said procedure, perhaps at specific shops. So hopefully not the entire fleet.

However, I'm not sure they'd give those planes 500 hours. What if a crew tried to do a go-around? With the gear stuck down, part of the upper wing wrecked, and good chance of a dead or degraded motor... all on the same side. What's the Vmc for that?

sailingfun 08-23-2023 04:05 PM


Originally Posted by rickair7777 (Post 3687167)
Since the trunnion thing is associated with a specific refurbishment procedure, presumably they could narrow it down to airframes which had been subject to said procedure, perhaps at specific shops. So hopefully not the entire fleet.

However, I'm not sure they'd give those planes 500 hours. What if a crew tried to do a go-around? With the gear stuck down, part of the upper wing wrecked, and good chance of a dead or degraded motor... all on the same side. What's the Vmc for that?

Why is there a good chance of a dead or degraded motor? Why would they go around?


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