CX flyboy From Hong Kong, joined Dec 1999, 6693 posts, RR: 55 Posted (15 years 2 days 16 hours ago) and read 1376 times:
In the 747-400, before start, you turn on one pump and another to aux, fuel pumps on etc etc... When you get to packs, you switch one off, then wait about 5-10 seconds then switch the second off. I know it's due to pressure, but what damage are you exactly risking if you turn two packs off at the same time?
Donm From , joined Dec 1969, posts, RR:
Reply 4, posted (15 years 1 day 3 hours ago) and read 1132 times:
VC-10 is correct, the problem is potential APU compressor stall. The reason the procedure is effective to the -400 only is the -400 has a different APU. More air was needed for auto-start and airconditioning management via automatic controls.
CX flyboy From Hong Kong, joined Dec 1999, 6693 posts, RR: 55
Reply 6, posted (15 years 16 hours ago) and read 1105 times:
Thanks for the answers - interesting indeed.
The airbus seems to have a lot of goodies that the ageing -400 does not.
To change the topic slightly, we are finally going to get autostart fitted on our -400s just like BA does. No more frantic monitoring during start.....now if only we can get electric seats fitted.....and where the hell are our headrests?