Originally Posted by
dixi188
ISTR that the service ceiling was 35000ft, some VIP 400s were certified with higher cabin diff that allowed then to go higher.
If you were light enough to get to FL350 then the fuel burn was very low allowing a 4+ hour flight duration, but back at about mach .71
The 300/400s were the best performers.
BIA’s 400’s we’re cleared to FL370 and on most flights were capable of getting there early on in the flight. Cabin pressure 8000’