- Difficulty date
- November 2, 2016
- Submitted
- November 7, 2016
- Operation
- Air carrier
- Make and model
- Boeing 737890
- Aircraft serial
- 35197
- Aircraft time
- 30,263 hours, 9,024 cycles
- Part
- Sensor
- Part number
- 38762272
- Condition
- Failed
- Location
- Apu
- Stage of operation
- NR
- How discovered
- O
- Nature of condition
- J
- Precautionary procedure
- O
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU PROTECTIVE SHUT DOWN, WITH FAULT LIGHT. (REVERSE FLOW SHUTDOWN) FAULT CODE 49-52017 (BLEED DISABLED TO PREVENT REVERSE FLOW) FAULT CODE 49-52269. ACFT GROUNDED. PERFORMED APU TROUBLESHOOTING IAW FIM 49-50 TASK 821. FOUND DELTA PRESSURE SENSOR READING INCORRECTLY. REMOVED AND REPLACED DELTA PRESSURE SENSOR IAW AMM 49-52-33. OPS CHECKED NORMAL AND NO FURTHER FAULTS NOTED.