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lahoanghai

15th August 2017 23:12

MMEL A321!Help me explain plz

29 HYDRAULIC POWER
30-03 ECAM HYD Page
Indications (Continued)
5) System Label C 3 0 (O) May be inoperative provided:
a) Associated system pressure is
verified before each departure,
and
b) Associated spoilers availability is
verified before each departure

Why we have to verify spoiler avail? (operate spoiler to confirm system pressure avail) , instead of other flight control surface.
Regards,

Goldenrivett

16th August 2017 12:24

Hi lahoanghai,

Quote:

Why we have to verify spoiler avail? (operate spoiler to confirm system pressure avail) , instead of other flight control surface.

See QRH, Operational Data, Flight Controls Architecture.
The individual spoilers are powered by a single HYD system, so if a HYD SYS pressure fails, the spoiler won't move.

The other flight control surfaces have at least 2 HYD Sytems powering them, so if only One HYD SYS fails, the surface will still move.

perruzo

18th August 2017 08:14

If spoilers are inoperative due to this item, then you would be limited to a max altitude.

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