What was found
APU UNRELIABLE FOR ENGINE START. REMOVED AND REPLACED APU GEN / CONTROL UNIT IAW AMM 24-22-02, OPS CHECK OK. NO FAULTS NOTED. STARTED ENGS / SEVERAL TIMES. APU GEN STAYED ON LINE, NO FAULTS NOTED. GOOD START. AMM 71-00-00.
- Difficulty date
- June 28, 2020
- Submitted
- June 29, 2020
- Operation
- Air carrier
- Aircraft
- N640GT
- Make and model
- Boeing 7673S1
- Aircraft serial
- 25221
- Aircraft time
- 91,317 hours, 19,446 cycles
- System (JASC)
- 4900 · Airborne Auxiliary Power Unit (APU) System
- Part
- Gcu
- Part number
- 734284F
- Part serial
- 4347
- Condition
- Failed
- Location
- Apu Generator
- Stage of operation
- IN
- How discovered
- 9
- Nature of condition
- O
- Precautionary procedure
- K
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.