What was found
APU SHUT DOWN AT GATE. AIRCRAFT WILL NOT ACCEPT APU POWER. INVESTIGATION REVEALS CONTACTOR (START RELAY) FAILED (WOULD NOT CLOSE). REPLACED PN BP493-1. OPERATIONAL CHECK OK.
- Difficulty date
- January 3, 1997
- Submitted
- March 26, 2000
- Operation
- Air carrier
- Aircraft
- N781UA
- Make and model
- Boeing 777222
- Aircraft serial
- 26945
- Engine
- Pwa PW4077
- System (JASC)
- 4900 · Airborne Auxiliary Power Unit (APU) System
- Part
- Contactor
- Part number
- BP4931
- Condition
- Failed
- Location
- Apu
- Stage of operation
- IN
- Nature of condition
- O
- Precautionary procedure
- K
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.