SDR SWAA2018022019931

Service difficulty report · Relief Valve · Boeing 7377BD

Difficulty date: February 18, 2018
Submitted: February 20, 2018
Operation: Air carrier
Aircraft: N7724A
Make and model: Boeing 7377BD
Aircraft serial: 36725
Aircraft time: 28,253 hours, 14,262 cycles
System (JASC): 2130 · Cabin Pressure Control System
Part: Relief Valve
Part number: 7207376
Part serial: 2009070691
Condition: Faulty
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

DECLARED EMERGENCY, CABIN ALTITUDE WARNING HORN CAME ON AT FL 380. CABIN ALTITUDE WAS AT 10,000. INITIATED QRC. WENT TO MANUAL MODE. CABIN CONTINUED UP TO 11,000 FEET. INITIATED EMERGENCY DESCENT. R&R NR 2 POSITIVE PRESSURE SAFETY RELIEF VALVE PER AMM.

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