Creases67
14th Jun 2013, 06:04
In normal conditions, the green and yellow HYD PPs are in auto.The blue is in stby. The function of all is fundamentally the same. Any reason then for the changed nomenclature ?
DutchOne
17th Jun 2013, 13:47
That's because in the older aircrafts the blue electric pump does not switch on automatically. For no reason. Hence in STBY mode.
While:
-The G HYD ELEC pump switches on automatically for 25s (in flt) to retract the gear in case of an engine failure.
-The Y HYD ELEC pump switches on automatically in case of engine 2 failure and the FLAP lever is not in 0.
only on the newer versions the B HYD ELEC pump switches on automatically in case of:
- engine 1 failure and PRIM 1 or 3 failure.
hope it helps.