What was found
APU SURGES WITH SINGLE PACK OPERATION. ECU BITE INDICATES ECU FAULT. REPLACED ECU IAW MM. OPERATED BOTH PACKS ONE AT A TIME AND TOGETHER WITH NO SURGES.
- Difficulty date
- February 12, 2012
- Submitted
- February 16, 2012
- Operation
- Air carrier
- Aircraft
- N550UA
- Make and model
- Boeing 757222
- Aircraft serial
- 25398
- Aircraft time
- 76,226 hours, 22,127 cycles
- Engine
- Pwa PW2037
- System (JASC)
- 4930 · APU Engine Fuel and Control
- Part
- Ecu
- Part number
- 211734220
- Part serial
- 301
- Condition
- Faulty
- Location
- Posit 'A'
- Stage of operation
- NR
- How discovered
- 9
- Nature of condition
- O
- Precautionary procedure
- O
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.