What was found
APU FAULTED AFTER THREE ATTEMPTS. IAW FIM 49-11 FT 987, 988, PERFORMED APU BITE TEST. FOUND BATTERY START APU OK, BUT APU TRU INOPERATIVE. APU START TRU REPLACED AND TESTED SERVICEABLE IAW AMM 24-32-04.
- Difficulty date
- January 7, 2020
- Submitted
- January 15, 2020
- Operation
- Air carrier
- Aircraft
- N643GT
- Make and model
- Boeing 7673JHF
- Aircraft serial
- 37809
- Aircraft time
- 16,526 hours, 4,553 cycles
- System (JASC)
- 4940 · APU Start/Ignition System
- Part
- Tru
- Part number
- 28VS200YB2
- Part serial
- 99108272
- Condition
- Failed
- Location
- Apu
- Stage of operation
- NR
- How discovered
- O
- Nature of condition
- O
- Precautionary procedure
- O
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.