SDR 99UAL900124

Service difficulty report · Controller · Boeing 727222

Difficulty date: February 21, 1999
Submitted: March 26, 2000
Operation: Air carrier
Aircraft: N7454U
Make and model: Boeing 727222
Aircraft serial: 21908
Engine: Pwa JT8D15
System (JASC): 2131 · Cabin Pressure Controller
Part: Controller
Condition: Malfunctioned
Location: Cabin
Component: 7632101
Stage of operation: CR
Nature of condition: O
Precautionary procedure: K

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

What was found

CABIN PRESSURE WENT TO 10,800 FEET AT 28,000 FEET ALTITUDE. THE OUTFLOW VALVE WAS FULLY CLOSED, WENT TO STANDBY, THEN TO MANUAL AND GOT THE PRESSURIZATION TO HOLD 8,000 FEET AT 10,000 FEET ALTITUDE. OPERATED IN MANUAL FOR THE REST OF THE TRIP. MAINTENANCE ACCOMPLISHED A LEAK CHECK AND NONE WERE FOUND. AS A PRECAUTION THE PRESSURE CONTROLLER WAS REPLACED.