Angel of Attack wrote on Apr 12
th, 2020 at 4:03pm:
Angel of Attack wrote on Feb 11
th, 2020 at 8:37am:
Today I fly into a snowing airport, as cold weather procedures, I set flaps 20 after landing, and taxi into gate, power on APU and shutdown, let ground crew check the flaps then retract to 0, while all my Hydualic EMDPs are running and pressures are in R hyd system, the flaps won't move (not even slowlly). Then I tried ALTN Flaps which use elec motor, but it doesn't work either.
AIIR#4
I just find I worte it worng as R system, Flaps and slats should be opreate by L system
whatever, it won't move (or it only move less than 5 unit before it stops) if both engines are off and ALL EMDPs are on.
On CS757 manual II p517~518 says EMDP on Left hyd can provide power to Flaps/slats
Also on page 222 shows ALTERNATE OPREATION will be done by Electirc motors, but it won't works too with engines off and APU or GPU in.
As soon as any engine is turnning, like by starters, not even started and running, both normal and altn opreation will work, while the hyd pressure shown on STATUS page has not changed.
Actually an easy fix for this.. so the issue is CS tied the flap animation to the normal P3D/FSX way of them moving. So as far as P3D calculates it, you don’t have actual hydraulic pressure unless an engine is running. I modified the [flaps.x] section on the aircraft.cfg.
I changed the system type from type=1 (hydraulic) to type=0 (electric).
Of course this sounds wrong, but it’s actually right as far as modeling goes! Now, my flaps don’t move at all unless the proper hydraulic system is powered. If the engines are off and the HYD system is powered, the flaps will move, if the engines are on and the HYD system is off, they won’t move. Just like in real life.
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SYSTEMS & DYNAMICS (Read 7181 times)
