SDR 2007UALA01004

Service difficulty report · Controller · Boeing 737322

Difficulty date: March 30, 2007
Submitted: April 10, 2007
Operation: Air carrier
Aircraft: N381UA
Make and model: Boeing 737322
Aircraft serial: 24656
Aircraft time: 48,361 hours, 34,192 cycles
Engine: Cfmint CFM563C1
System (JASC): 2131 · Cabin Pressure Controller
Part: Controller
Condition: Malfunctioned
Location: Cabin Altitude
Stage of operation: DE
How discovered: O
Nature of condition: J
Precautionary procedure: O

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

What was found

DURING DESCENT AT FL230 CABIN ALT WARNING SOUNDED AND CABIN WAS AT 9800. [SUP 5-1-07] FOUND FAULTY CABIN PRESSURE CONTROLLER. REPLACED CABIN PRESSURE CONTROLLER. SHOP FOUND LOOSE SCREW ON TRANSFORMER. BAD Q3. REPLACED Q3. REPAIRED AND TESTED.