- Difficulty date
- April 23, 2023
- Submitted
- April 25, 2023
- Operation
- Air carrier
- Make and model
- Boeing 737890
- Aircraft serial
- 35185
- Aircraft time
- 58,713 hours, 17,522 cycles
- Part
- Data Unit
- Part number
- 38762871
- Part serial
- GE6060
- Condition
- Faulty
- Location
- Apu
- Part time
- 18,711 hours, 28,277 cycles
- Stage of operation
- IN
- How discovered
- O
- Nature of condition
- O
- Precautionary procedure
- K
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING APU TROUBLESHOOTING FOUND MESSAGE 49-72103 "DATA MEMORY MODULE CIRCUIT FAILURE". SUSPECT APU WIRING HARNESS. GROUNDED - YES. REF B737-800 FIM 49-70 TASK 806, REMOVED AND REPLACED APU WIRING HARNESS IAW B737-800 AMM 49-011-01. MAINT MSG 49-72103 STILL PRESENT. T/S AND FOUND APU DMM AT FAULT. REMOVED AND REPLACED APU DMM IAW AMM 49-72-11 AND APU OPS NML - MSG 49-72103 EXTINGUISHED.