SDR CA990119027

Service difficulty report · Valve · Boeing 757236

Difficulty date: December 31, 1998
Submitted: March 26, 2000
Operation: General aviation
Make and model: Boeing 757236
Engine: Rroyce RB211535E4
System (JASC): 2131 · Cabin Pressure Controller
Part: Valve
Part number: 32143067
Condition: Failed
Location: Cabin Pressure
Component: 32143067
Stage of operation: CR
Nature of condition: W, J
Precautionary procedure: B, G

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

(CAN) DURING CRUISE AT FL 350 FEET, THE CABIN ALTITUDE STARTED TO FLUCTUATE 1,000 FEET PER MINUTE. CHANGED THE SELECTOR TO AUTO NR 1, NO CHANGE. DURING DESCENT FROM 350 FEET, THE CABIN RATE STAYED 1,500 FEET PER MIN CLIMB. MANUAL CONTROL NON-EFFECTIVE. OXYGEN MASKS WERE DEPLOYED AND AIRCRAFT RETURNED. NR 2 PRESSURE REGULATOR REPLACED.