engines dosn't start

[helmholz]

LAST EDITED ON Jan-01-02 AT 06:25AM (EDT)[p]Hallo,
I have a Problem to start the engines only with the APU. Till last week the procedure was running. Suddenly it isn't possible yet to Start the engines with APU Power.
I use the following procedure:

- battery on
- APU bleed off
- hydraulic pumps off
- start APU

if APU is runnig
- switch APU power on bus
- fuel pumps on
- engine start to GND (first left engine)

i think, now the fan of the left engine has to turn on, but it dosn't turn.

If I switch ground power to the bus the engine starts.
As I telled before till last week it was possible to start with APU power.

I have started the PC an program new but the result is always the same.

Has somebody an idea?

[HartmannH]

Hi,

you need APU bleed air to start the engines. Just leave that switch in ON position.

Best regards

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[helmholz]

Thank you for information. It was my mistake, now it will be run.

Regards
Manfred Helmholz

[helmholz]

An other Question:

Why can I start the engines with ground power and without the APU bleed? Is here no APU bleed nessesary to drive the engines?

regards
Manfred