What was found
EICAS-SUPERNUMERARY OXYGEN ON. MASKS DROPPED- NORM PRESSURE. CABIN ALT 5300'.
- Difficulty date
- July 27, 2012
- Submitted
- July 30, 2012
- Operation
- Air carrier
- Aircraft
- N409MC
- Make and model
- Boeing 74747UF
- Aircraft serial
- 30558
- Aircraft time
- 53,695 hours, 8,040 cycles
- Engine
- Ge CF680C2B1F
- System (JASC)
- 3520 · Passenger Oxygen System
- Part
- Oxygen System
- Condition
- Malfunctioned
- Stage of operation
- CR
- How discovered
- 9
- Nature of condition
- O
- Precautionary procedure
- O
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.