NSEU
29th Apr 2011, 02:32
During reverse thrust ops, a CF6 engine will be put into high (approach) idle.
The reverser system energises electrical relays (in the equipment centre) which send a signal to the CF6 ECU and this triggers high idle.
I was wondering if the RB211 or the PW4000 go into high idle during reverse thrust. The relays which control high/low idle on aircraft with these particular engines don't appear to have any input from the reverser system.
If the idle changes, is it done with direct reverse lever input into the EEC/ECU's?
Incidentally, why is the engine put into high idle during this period? For additional pneumatic pressure to drive the reversers? Or simply for faster spoolup time?
Thanks for any insight
Cheers
NSEU
The reverser system energises electrical relays (in the equipment centre) which send a signal to the CF6 ECU and this triggers high idle.
I was wondering if the RB211 or the PW4000 go into high idle during reverse thrust. The relays which control high/low idle on aircraft with these particular engines don't appear to have any input from the reverser system.
If the idle changes, is it done with direct reverse lever input into the EEC/ECU's?
Incidentally, why is the engine put into high idle during this period? For additional pneumatic pressure to drive the reversers? Or simply for faster spoolup time?
Thanks for any insight
Cheers
NSEU