gigneil
Topic Author
Posts: 14133
Joined: Fri Nov 08, 2002 10:25 am

767-300ER Max Crz Alt, And Altimeter Questions.

Sun Dec 15, 2002 12:44 pm

I was just talking to a friend that took the DL BizElite 767-300ER service from JFK to SFO yesterday.

He said the weather was exceedingly bad, and that they cruised around FL430 a good part of the trip.

I was under the impression that the 763's max alt was only FL410.

This prompted a discussion of altimeters. We visited the possibility that the turbulent air caused a misread with a barometric altimeter. But then he pointed out that a lot of planes judge alt via GPS now.

Can anyone shed some light?

N
 
AJ
Posts: 2295
Joined: Wed Nov 03, 1999 3:54 pm

RE: 767-300ER Max Crz Alt, And Altimeter Questions.

Sun Dec 15, 2002 3:29 pm

The ceiling for the B767-300 is 43,100' pressure altitude, so flight level 430 is achievable. The weights for this altitude must be very light (about 116T all up weight) so it is not often used.
 
Rick767
Posts: 2613
Joined: Sun Jan 30, 2000 8:11 pm

RE: 767-300ER Max Crz Alt, And Altimeter Questions.

Mon Dec 16, 2002 6:39 am

Like AJ said, we can go right up to FL431 (operationally FL430) but the weight must be very low to achieve this. Even at the very end of our long flights with most fuel burnt we can only sometimes make FL410.
I used to love the smell of Jet-A in the morning...
 
timz
Posts: 6305
Joined: Fri Sep 17, 1999 7:43 am

Gps?

Tue Dec 17, 2002 6:21 am

Jetliners never measure their altitude by GPS, do they?
 
cdfmxtech
Posts: 1319
Joined: Wed Jul 05, 2000 11:37 am

RE: 767-300ER Max Crz Alt, And Altimeter Questions.

Tue Dec 17, 2002 7:21 am

GPS altitude is not used by airplane systems on any of the GPS enabled birds that I work with (B737NG, B757/B767, B777). Only pressure and Radio altitudes are used.
 
Rick767
Posts: 2613
Joined: Sun Jan 30, 2000 8:11 pm

RE: 767-300ER Max Crz Alt, And Altimeter Questions.

Tue Dec 17, 2002 10:04 am

GPS altitude?! No way... pressure alt. works fine for us. GPS lateral navigation is making its way in, but in vertical terms GPS remains very unreliable, and very often incorrect.
I used to love the smell of Jet-A in the morning...
 
gigneil
Topic Author
Posts: 14133
Joined: Fri Nov 08, 2002 10:25 am

RE: 767-300ER Max Crz Alt, And Altimeter Questions

Tue Dec 17, 2002 10:22 am

Thanks guys, that's what I wanted to know.

N

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