What was found
CABIN PRESSURE CANNOT BE MAINTAINED IN DESCENT. *S/D* SUSPECT NR 3 ENG HIGH PRESSURE MODULATING VALVE. REPLACED HIGH PRESSURE MODULATING VALVE.
- Difficulty date
- June 28, 2001
- Submitted
- July 10, 2001
- Operation
- Air carrier
- Aircraft
- N7446U
- Make and model
- Boeing 727222
- Aircraft serial
- 21900
- Aircraft time
- 58,953 hours, 35,295 cycles
- System (JASC)
- 3610 · Pneumatic Distribution System
- Part
- Valve
- Part number
- 39271611MOD
- Condition
- Failed
- Location
- Nr 3 Engine
- Stage of operation
- DE
- 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.