What was found
DURING PREFLIGHT, FOUND OBS SEAT O2 MASK DOES NOT RESET DURING TEST. R & R OBSERVER'S O2 MASK ASSY IAW AMM 35-11-51 & IPC 35-11-51. OPS & LEAK CHECK GOOD AT THIS TIME.
- Difficulty date
- December 11, 2025
- Submitted
- December 15, 2025
- Operation
- Air carrier
- Aircraft
- N642GT
- Make and model
- Boeing 7673Y0
- Aircraft serial
- 26207
- Aircraft time
- 88,430 hours, 25,625 cycles
- System (JASC)
- 3510 · Crew Oxygen System
- Part
- Stowage Box
- Part number
- MXP147
- Part serial
- S7094
- Condition
- No Test
- Location
- Oxygen Mask
- Stage of operation
- IN
- How discovered
- C
- Nature of condition
- L
- Precautionary procedure
- K
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.