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#1 Engine Phase B High Voltage


Nate Anderson
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During the generator ops check, the book tells you to sequentially turn on/off the generators to tell you if the generator can handle the load of the aircraft. When generator 2,3,4 are off generator #1 shows high voltage on phase B only (121 volts). Along with that, we are getting ECBU's 6,7,8 input failures. We have changed GCU, engine generator and swapped BIU's. We still are getting the same problem. Any input will help. Thanks in advance

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20 hours ago, Nate Anderson said:

During the generator ops check, the book tells you to sequentially turn on/off the generators to tell you if the generator can handle the load of the aircraft. When generator 2,3,4 are off generator #1 shows high voltage on phase B only (121 volts). Along with that, we are getting ECBU's 6,7,8 input failures. We have changed GCU, engine generator and swapped BIU's. We still are getting the same problem. Any input will help. Thanks in advance

Oh There are problem of load sharing on  B phase. Check the Cargo compartment Recirculating FAN motor how much current drawn  by the fan A & C  phase and Galley power outlets.Also Check Y  grounding/current  transformer connections polarity X1 and X2 of  The ENGINE QEC/FS 245.

Munir Abbasi 

Home of hercules Pakistan 

Edited by munirabbasi
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