What was found
APU SIGMA SEAL INSP FOUND SIGMA SEAL OUT OF LIMITS. GROUNDED - YES. REPLACED SIGMA SEAL ON APU REF AMM 49-15-11.
- Difficulty date
- March 13, 2018
- Submitted
- March 14, 2018
- Operation
- Air carrier
- Aircraft
- N423AS
- Make and model
- Boeing 737990ER
- Aircraft serial
- 35206
- Aircraft time
- 19,462 hours, 6,427 cycles
- System (JASC)
- 4920 · APU Core Engine
- Part
- Seal
- Part number
- B0E23530001
- Condition
- Out Of Limits
- Location
- Apu
- 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.