4 ms·

An informed take on what may or may not have happended: https://youtu.be/w1r8dl4RqMw?si=BzEnCzbgv7oYNNwe https://youtu.be/w1r8dl4RqMw?si=BzEnCzbgv7oYNNwe Only

by eggy 2y ago

An informed take on what may or may not have happended: https://youtu.be/w1r8dl4RqMw?si=BzEnCzbgv7oYNNwe https://youtu.be/w1r8dl4RqMw?si=BzEnCzbgv7oYNNwe Only one engine was in reverse, and flaps were not down. The YT video also excerpts manuals and diagrams to good effect for a lay person who is not a pilot. Video of engine failing near airport may have been bird strike. They were in flight 4+ hours, so fuel should have been used to an extent, but don't they dump fuel when they are going to land in an emergency like this? The fireball was big, and they should have shut fuel pumps before flare up of reversing engines on runway. The 1-foot-thick concrete wall for the atenna array seems to have caused it to impact hard enough to cause the most damage and fireball. The video points out there are lots of these with less robust structures at most airports.

tekla 2y ago
737 NG does not have fuel dump capability. Its hard to use the thrust reverser if the fuel pumps are off.
- eggy 2y ago
  Interesting. How does bird strike on one engine shut down all systems? Aren't there a left/right engine system and an auxillary? The same video was updated today, and he conjectured it may have been they shut the wrong engine down like in a previous Taiwan air incident. They only had 5 min. to do anything according to the timeline.
  - tekla 2y ago
    A bird strike doesn't. From the external video, none of this makes sense. The hydraulics are triple redundant and independent of each other. Even without both engines to run pumps or generators, you can drop the gear via gravity and use either leftover hydraulic pressure to drop flaps or the use electrical backup, which should work on battery or APU. You can hear at least one engine running before it touches the ground AND you can see that the plane is at least in somewhat in control, considering it lines up with the runway properly and does a flare AND a thrust reverser is active before it hits the ground. The control surfaces work without power (with great effort) since they are mechanically linked in the case of emergency on the 737 NG. If the gears were down, it should have triggered automatic flaps to slow the plane down on touchdown. None of this makes sense, unless we assume the pilots royally fucked up basically everything. They missed the optimal landing point and only used about 40% of the runway traveling at what appears to be at least 80 knots above the normal max landing speed.

by eggy 2y ago

tekla 2y ago

737 NG does not have fuel dump capability. Its hard to use the thrust reverser if the fuel pumps are off.

eggy 2y ago
Interesting. How does bird strike on one engine shut down all systems? Aren't there a left/right engine system and an auxillary? The same video was updated today, and he conjectured it may have been they shut the wrong engine down like in a previous Taiwan air incident. They only had 5 min. to do anything according to the timeline.
- tekla 2y ago
  A bird strike doesn't. From the external video, none of this makes sense. The hydraulics are triple redundant and independent of each other. Even without both engines to run pumps or generators, you can drop the gear via gravity and use either leftover hydraulic pressure to drop flaps or the use electrical backup, which should work on battery or APU. You can hear at least one engine running before it touches the ground AND you can see that the plane is at least in somewhat in control, considering it lines up with the runway properly and does a flare AND a thrust reverser is active before it hits the ground. The control surfaces work without power (with great effort) since they are mechanically linked in the case of emergency on the 737 NG. If the gears were down, it should have triggered automatic flaps to slow the plane down on touchdown. None of this makes sense, unless we assume the pilots royally fucked up basically everything. They missed the optimal landing point and only used about 40% of the runway traveling at what appears to be at least 80 knots above the normal max landing speed.