PPRuNe Forums - B757 utility buses

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fingal flyer

3rd Nov 2007 00:20

B757 utility buses

Just wondering why they both go off when apu is running electrics and thrust levers are advanced.IE engines shutdown.Suspect it is load shedding due to a/c logic suspecting double engine failure but can anyboby help an ignorant pilot.

Short_Circuit

3rd Nov 2007 00:39

Yes f.f., it is load shedding due “single power source” supplying buses with thrust levers advanced.
S_cct

NSEU	4th Nov 2007 01:00

It's probably like the 767 which loadsheds in the air with a single power source. On the 767, Boeing defined "in air" (wrt to loadshedding) as weight off wheels(bogey tilt) or thrust levers advanced (presumably as a backup for the gear tilt).

Rgds.
NSEU

flyboyike

4th Nov 2007 15:24

The CRJ does the exact same thing. It doesn't even have to be in the air. All it takes it to be single-gen, main door closed, flaps out of zero.

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