SDR CALA2014120201486

Service difficulty report · Controller · Boeing 737724

Difficulty date: December 2, 2014
Submitted: December 2, 2014
Operation: Air carrier
Aircraft: N39726
Make and model: Boeing 737724
Aircraft serial: 28796
Aircraft time: 51,921 hours, 17,530 cycles
System (JASC): 2131 · Cabin Pressure Controller
Part: Controller
Part number: 71211997101AC
Part serial: 9711985041201
Condition: Failed
Location: Cabin Pressure
Stage of operation: CR
How discovered: O
Nature of condition: Z
Precautionary procedure: B

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

What was found

RAPID DECOMPRESSION OF CABIN AT FL 340. CABIN APPROACHED APPROX 20,000 FT BEFORE IT WAS ARRESTED. NO DOOR LIGHTS. REF FOLLOWING LP FOR PARTS REPLACED. LP 8007273, 8007274, 8007275, 8007278 & 8007268. COMPONENTS REPLACED, BOTH PRESS CONTROLLERS, ONE SHOWED INTERNAL FAILURE THE OTHER WAS CHANGED PRECAUTIONARY, PRESS CONTROL PANEL, CHANGED PRECAUTIONARY, OUTFLOW VLV, REMOVED FOR INSPECTION & SINCE ALREADY OUT, CHANGED PRECAUTIONARY.