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fredgrav
7th Mar 2010, 21:41
Hi there !
Does anyone know why a PTU fault is triggered if the second engine is started within 40 seconds following the end of the cargo doors operation ?! [FCOM 3.03.08 p.2]

Thanks in advance ! :ok:
fredgrav

Cardinal
8th Mar 2010, 04:56
The PTU is inhibited during and immediately after cargo door operation.

Normally the PTU will run briefly during the second engine start after the engine masters are both "On" and the hyd differential still exists. The aircraft looks specifically for this operation, and considers it a 'test.'

Start the 2nd engine while the PTU is still inhibited due to cargo door operation, the test never happens, the aircraft is unhappy and the fault is generated.

fredgrav
8th Mar 2010, 07:09
Thanks a million Cardinal ! ;)

Microburst2002
8th Mar 2010, 10:13
In this case, "who" is the aircraft?

The SDACs? CFDS?

mono
8th Mar 2010, 14:07
You'd have to be damn quick to get 2 engines started within 40 seconds!!!

As has been said. the PTU is inhibited when the cargo doors are operated and the inhibit continues for 40 secs after the door operation has finished.

fredgrav
8th Mar 2010, 20:20
Thanks guys! 40 seconds ... i'd like to be that quick !!! ;)

aulglarse
9th Mar 2010, 12:11
Is it a coincidence that the cargo door operation to complete it's closing cycle taking 40 seconds?