|Quoting 2enginesonly (Reply 3):
The oilcooler door on the F50 is controlled electronically through the powerlevers and the auto feather unit.....no switch in the cockpit for manual control.
As with any Fokker it all depends on customer demands at the time and/or the mod status afterwards.
If I remember correctly standard F50's were fitted with an 2 channel ERSP(Engine Rate Select Panel) as thrust panel.
In this case there is very little logic to control the oil cooler door.
On ground ? = yes
Take off ? = yes
Engine fail ? = No
Door open for 30 seconds then closed again.
The Power levers are used as an input to determine Take of mode or not.
This all changes when there is a 3 channel PMP(Power Management Panel) with a lot more logic installed instead of the ERSP.
Now the Oil Cooler door is operated by channel C of the PMP in normal circumstances, an override may come from channel A and/or B and PLA is just an PMP input.
Simplified PMP schematic:
To cause a little more confusion
We have customers who decided to change from ERSP to PMP thrust mode control without adapting the oil cooler door.
In this case the PMP is hard wired to leave the oil cooler door operation the "old" way and the PMP will just take over the thrust management.
Forgot the ERSP vendor(probably Honeywell or Smith), the PMP is a Fokker development.
More confusion 2.
The PMP comes in 2 different versions both with 2 different sub versions.
With or without auto approach speed control for example.
[Edited 2007-03-29 23:33:02]