SDR UIEA2020101102213

Service difficulty report · Outflow Valve · Boeing 76733A

Difficulty date: October 10, 2020
Submitted: October 14, 2020
Operation: Air carrier
Aircraft: N1997A
Make and model: Boeing 76733A
Aircraft serial: 27310
Aircraft time: 98,916 hours, 20,436 cycles
System (JASC): 2133 · Pressure Regulator/Outflow Valve
Part: Outflow Valve
Part number: 60683221
Part serial: 162083
Condition: Malfunctioned
Location: Cabin Pressure
Stage of operation: CR
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

WHILE CRUISE AT FL 390 CRUISE VALVE OPENED AND RUMBLE MULTIPLE TIMES. REMOVED AND REPLACED OUTFLOW VALVE ASSEMBLY, IAW AMM 21-31-01-004. OPERATIONAL TEST OK. REMOVED AND REPLACED CABIN PRESS SELECTOR PANEL ASSEMBLY, IAW AMM 21-31-04. OPERATIONS CHECK GOOD (OFF PART: PN 130502-7, SN 42-A0009).

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