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eliasafr

atm gen

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With  4 eng low when fetharing pump on for fetharing the prop on ground check atm generator light goes on. We changed the atm gen and atm but prob remain same.............need ur suggestion please.

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Change your Voltage Regulator or increase the voltage output reading.

Watch the frequency and voltage when you feather the prop and see if it drops.

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Assuming one aux pump may be overloading the ATM generator.  Check your ATM gen load for each aux pump (energize one prop aux pump at a time) to find out if one of the aux pump is drawing more power than the others. This may indicate the pump or wiring is  going/bad. 

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On 1/16/2016 at 1:52 PM, eliasafr said:

With  4 eng low when feathering pump on for feathering the prop on ground check atm generator light goes on. We changed the atm gen and atm but prob remain same.............need ur suggestion please.

Normally it happened due ATM regulating  valve assembly. please cannibalize to other

munir abbasi

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