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bost pump


sharif101
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#3eng indicate fuel tank bost pump fail in flight. after landing ops check by external power bost pump ok.again eng run same problem.#3 Generator voltage,frq ok.but when #3 tank bost pump operate by #4 eng Generator or external power then bost pump works properly.#3 generator works bus tie and all indicator system except #3 bost pump operate

help Pls

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sharif101;

Some boost pumps having dignity and response, yours might be the one...

By the way is your aircraft still equipped with bus off lights and fuel manifold pressure indicator?

yea,bus off lights and fuel manifold presure indicator is available.

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So, if you are checking this during an engine run, with all four engines on speed, the #3 pump fails with all 4 generators online? Does the pump start working when you switch the #3 generator switch off?

You don't have any AC bus off indications?

dear,now problem was changed which is #3 generator voltage, frequency normal but dont load to operate boost pump,aux pump .ac bus off indication ok.generator new.

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If #3 generator is the only generator "ON" and the Ess and Main AC buss OFF lights are illuminated (and LH and RH) your Generator contactor did not energize. Swap the GCP and see what happens (works bad GCP)

Also you can swap the frequency sensitive relay and see what happens. Swap GCP check it, then try the relay...

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