SDR ASAA2018061154927

Service difficulty report · Outflow Valve · Boeing 737990ER

Difficulty date: June 5, 2018
Submitted: June 11, 2018
Operation: Air carrier
Aircraft: N453AS
Make and model: Boeing 737990ER
Aircraft serial: 36354
Aircraft time: 17,500 hours, 5,804 cycles
System (JASC): 2133 · Pressure Regulator/Outflow Valve
Part: Outflow Valve
Part number: 2123010BA
Part serial: 13115272
Condition: Failed
Location: Cabin Pressure
Part time: 17,540 hours, 5,818 cycles
Stage of operation: CL
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 CLIMB OUT, RECEIVED AN AUTO FAIL LIGHT FOR THE PRESSURIZATION SYSTEM, PERFORMED QRH, WENT TO ALTERNATE MODE, SYSTEM OPERATED NORMALLY. ACFT GROUNDED. REMOVED AND REPLACED THE AFT OUTFLOW VALVE ASSEMBLY IAW AMM 21-31-03. SYSTEM GROUND TESTED GOOD. AUTO FAIL LIGHT DID NOT RETURN, PRESSURE CONTROLLER NR 1 AND PRESSURE CONTROLLER NR 2, NO FAULTS RECORDED.