What was found
AFTER APU START COMPRESSOR STALLS CAN BE HEARD & RPM FLUCTUATES. ACFT GROUNDED. ACCOMPLISHED APU BITE CHECK, NO FAULTS NOTED. RAN APU NO STALLS NOTED, INPUT MONITORING SPEED WAS STEADY AND CONSTANT WITH AND WITHOUT LOADS.
- Difficulty date
- February 23, 2014
- Submitted
- February 26, 2014
- Operation
- Air carrier
- Aircraft
- N535AS
- Make and model
- Boeing 737890
- Aircraft serial
- 35200
- Aircraft time
- 12,218 hours, 3,554 cycles
- System (JASC)
- 4920 · APU Core Engine
- Part
- Engine
- Condition
- Stalled
- Location
- Apu
- Stage of operation
- TX
- How discovered
- O
- Nature of condition
- R
- Precautionary procedure
- O
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.