What was found
APU EGT TREND DATA SHOWS EGT HAS SHIFTED ABOVE THE MAINTENANCE THRESHOLD OF 593 BUT LESS THAN 605 DEGREES. ACFT GROUNDED. REMOVED & REPLACED BOTH APU THERMOCOUPLES IAW AMM 49-71-21. OPS NORMAL, NO FAULTS FOUND.
- Difficulty date
- February 21, 2017
- Submitted
- February 23, 2017
- Operation
- Air carrier
- Aircraft
- N506AS
- Make and model
- Boeing 737890
- Aircraft serial
- 35690
- Aircraft time
- 33,025 hours, 10,094 cycles
- System (JASC)
- 4970 · APU Indicating System
- Part
- Thermocouple
- Part number
- 38762711
- Condition
- Failed
- Location
- Apu Exhaust
- 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.