What was found
SIGMA SEAL FAIL DIMENSION INSPECTION. GROUNDED - YES. REMOVED AND REPLACED SIGMA SEAL WITH REF B737-900 AMM 49-15-11.
- Difficulty date
- September 10, 2023
- Submitted
- September 11, 2023
- Operation
- Air carrier
- Aircraft
- N419AS
- Make and model
- Boeing 737990ER
- Aircraft serial
- 41734
- Aircraft time
- 39,098 hours, 12,364 cycles
- System (JASC)
- 4900 · Airborne Auxiliary Power Unit (APU) System
- Part
- Seal
- Part number
- B0E23530001
- Condition
- Out Of Limits
- Location
- Apu Inlet
- Stage of operation
- IN
- How discovered
- V
- Nature of condition
- O
- Precautionary procedure
- K
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.