What was found
WHILE OPERATING LT PACK ON APU AIR SOURCE, FLIGHT CREW OBSERVED 2 DUCT PRESSURE SURGES, GROUND CREW ALSO REPORTED THE SOUND OF THE APU EXHAUST SURGE. ACFT GROUNDED. R & R THE APU IAW TASK CARD 78349010. APU OPS CHECK PASS, NO SURGE.
- Difficulty date
- December 19, 2015
- Submitted
- December 22, 2015
- Operation
- Air carrier
- Aircraft
- N593AS
- Make and model
- Boeing 737890
- Aircraft serial
- 35107
- Aircraft time
- 29,855 hours, 9,199 cycles
- System (JASC)
- 4900 · Airborne Auxiliary Power Unit (APU) System
- Part
- Apu
- Part number
- 38007021
- Part serial
- P7807
- Condition
- Failed
- Location
- Apu Bay
- Part time
- 29,862 hours, 9,204 cycles
- Stage of operation
- TX
- 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.