Erfandean
Topic Author
Posts: 2
Joined: Tue Oct 10, 2017 4:27 pm

Pressurization FLT ALT & LAND ALT

Tue Oct 10, 2017 4:36 pm

Why do we set flight (cruise) altitude and landing altitude on the pressurization panel on overhead panel?

thanks in advance!
 
Lpbri
Posts: 24
Joined: Tue Sep 27, 2016 7:18 pm

Re: Pressurization FLT ALT & LAND ALT

Tue Oct 10, 2017 6:37 pm

It's required if pressurization mode is in Auto. Cabin altitude equals field altitude on landing. Reduces crew workload.
 
Woodreau
Posts: 1418
Joined: Mon Sep 24, 2001 6:44 am

Re: Pressurization FLT ALT & LAND ALT

Tue Oct 10, 2017 7:01 pm

It means the aircraft manufacturer hasn't designed the pressurization system to get the information from the flight management system computers, so your workload is increased a little bit to have to manually set the information on the overhead panel. You'll know you forgot to do something if your ears start feeling wierd on the descent.
Bonus animus sit, ab experientia. Quod salvatum fuerit de malis usu venit judicium.
 
Erfandean
Topic Author
Posts: 2
Joined: Tue Oct 10, 2017 4:27 pm

Re: Pressurization FLT ALT & LAND ALT

Wed Oct 11, 2017 5:29 pm

thank you for your answers!
but i would like to know why pilots set specifically cruise and landing ALT. are we basically telling the FMC what the cabin altitude or pressure should be at such altitudes. or to keep the appropriate pressure difference inside and outside?
the question could be stupid but i'm a beginner. hope you understand :), thanks again!
 
Redbellyguppy
Posts: 58
Joined: Sat Apr 01, 2017 3:57 am

Re: Pressurization FLT ALT & LAND ALT

Wed Oct 11, 2017 9:30 pm

The cruise altitude is needed so the pressurization controller can schedule the rate of climb. The landing altitude is needed for the same reason, but to schedule the descent.

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