What was found
ON ENGINE START N2 DID NOT INCREASE ABOVE 18 - 20 % NR 2 THAN NR 1 ENGINE. ACFT GROUNDED. REPLACED NR 1 AND 2 EGT THERMOCOUPLE IAW AMM 49-71-21. OPS CHECKED OK.
- Difficulty date
- June 30, 2016
- Submitted
- July 5, 2016
- Operation
- Air carrier
- Aircraft
- N431AS
- Make and model
- Boeing 737990ER
- Aircraft serial
- 43255
- Aircraft time
- 10,708 hours, 3,499 cycles
- System (JASC)
- 4900 · Airborne Auxiliary Power Unit (APU) System
- Part
- Thermocouple
- Part number
- 38762711
- Condition
- Failed
- Location
- Apu
- Stage of operation
- TX
- How discovered
- O
- Nature of condition
- O
- Precautionary procedure
- D
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.