Baseless aircrash speculation

Discussions about serious topics, for serious people
Post Reply
User avatar
shpalman
Princess POW
Posts: 8621
Joined: Mon Nov 11, 2019 12:53 pm
Location: One step beyond
Contact:

Baseless aircrash speculation

Post by shpalman »

Sriwijaya Air Boeing 737

It's an older model, a 737-500, so nothing to do with the problems the MAX had. The profile wouldn't fit anyway: it appears to have basically fallen out of the sky having reached about 10,000'.

Explosive decompression due to metal fatigue?
having that swing is a necessary but not sufficient condition for it meaning a thing
@shpalman@mastodon.me.uk
@shpalman.bsky.social / bsky.app/profile/chrastina.net
threads.net/@dannychrastina
User avatar
Martin Y
Stummy Beige
Posts: 3309
Joined: Mon Nov 11, 2019 1:08 pm

Re: Baseless aircrash speculation

Post by Martin Y »

Explosive decompression isn't likely at 10,000 ft.

Don't high altitude flights typically allow cabin pressure to drop to about 8-10k feet equivalent?
User avatar
dyqik
Princess POW
Posts: 8368
Joined: Wed Sep 25, 2019 4:19 pm
Location: Masshole
Contact:

Re: Baseless aircrash speculation

Post by dyqik »

Martin Y wrote: Sat Jan 09, 2021 6:47 pm Explosive decompression isn't likely at 10,000 ft.

Don't high altitude flights typically allow cabin pressure to drop to about 8-10k feet equivalent?
8k usually, which is about 75% of an atmosphere, or about 1.2 psi pressure difference at 10k feet. If that didn't happen, it's a ~5 psi over pressure at 10k feet.

Typical pressure differences between 8k ft and cruising altitude are ~7-8 psi, so even with a failure to lower the pressure, the pressure difference is 2/3 of the nominal design value.
User avatar
shpalman
Princess POW
Posts: 8621
Joined: Mon Nov 11, 2019 12:53 pm
Location: One step beyond
Contact:

Re: Baseless aircrash speculation

Post by shpalman »

True that there shouldn't have been that much of a pressure difference at 10,000'. The cabin altitude needs to be maintained at 8,000' or below on commercial flights, but that's relevant when at cruising altitude.

We recently had a 737-700 suffer decompression due to an uncontained engine failure, but not in a way which was catastrophic for the airframe.
having that swing is a necessary but not sufficient condition for it meaning a thing
@shpalman@mastodon.me.uk
@shpalman.bsky.social / bsky.app/profile/chrastina.net
threads.net/@dannychrastina
Post Reply