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767-300ER Max Crz Alt, And Altimeter Questions.  
User currently offlineGigneil From United States of America, joined Nov 2002, 16347 posts, RR: 85
Posted (12 years 1 week 2 days 3 hours ago) and read 4159 times:

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

6 replies: All unread, jump to last
 
User currently offlineAJ From Australia, joined Nov 1999, 2397 posts, RR: 25
Reply 1, posted (12 years 1 week 2 days ago) and read 4126 times:

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.

User currently offlineRick767 From United Kingdom, joined Jan 2000, 2662 posts, RR: 51
Reply 2, posted (12 years 1 week 1 day 9 hours ago) and read 3977 times:

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...
User currently offlineTimz From United States of America, joined Sep 1999, 6902 posts, RR: 7
Reply 3, posted (12 years 1 week 9 hours ago) and read 3841 times:

Jetliners never measure their altitude by GPS, do they?

User currently offlineCdfmxtech From United States of America, joined Jul 2000, 1341 posts, RR: 26
Reply 4, posted (12 years 1 week 8 hours ago) and read 3833 times:

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.

User currently offlineRick767 From United Kingdom, joined Jan 2000, 2662 posts, RR: 51
Reply 5, posted (12 years 1 week 6 hours ago) and read 3815 times:

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...
User currently offlineGigneil From United States of America, joined Nov 2002, 16347 posts, RR: 85
Reply 6, posted (12 years 1 week 5 hours ago) and read 3813 times:

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

N


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