What was found
CABIN PRESSURE CAN NOT BE MAINTAINED (CABIN ALTITUDE RISES) IN DESCENT. BOTH AUTO & STANDBY THIS HAPPENS EVEN AT 5000 FEET. DUCT PRESSURE NORMAL. REPLACED THE NR 3 ENGINE 13TH STAGE MODULATOR VALVE, AND THE PRESSURE CONTROLLER.
- Difficulty date
- July 23, 2001
- Submitted
- September 12, 2001
- Operation
- Air carrier
- Aircraft
- N7463U
- Make and model
- Boeing 727222
- Aircraft serial
- 21917
- Aircraft time
- 60,994 hours, 35,145 cycles
- Engine
- Pwa JT8D15
- System (JASC)
- 2131 · Cabin Pressure Controller
- Part
- Controller
- Condition
- Failed
- Location
- Cabin Pressure
- 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.