SDR SCNA20190221028

Service difficulty report · Relief Valve · Boeing 7378BK

Difficulty date: February 21, 2019
Submitted: February 22, 2019
Operation: Air carrier
Aircraft: N814SY
Make and model: Boeing 7378BK
Aircraft serial: 30620
Aircraft time: 53,481 hours, 30,018 cycles
System (JASC): 2133 · Pressure Regulator/Outflow Valve
Part: Relief Valve
Condition: Faulty
Location: Cabin Pressure
Stage of operation: CL
How discovered: O
Nature of condition: J
Precautionary procedure: A

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

What was found

CABIN ALT WARNING. CABIN ALT WAS + 1,500 FPM AT 25,000 THEN SETTLED AT 33,000. CABIN ALT WARNING SOUNDED AT 33,000. WE DID THE MEMORY ITEM AND A RAPID DECENT. STABILIZED AROUND 15,000. REMOVED AND REPLACED RT POSITIVE PRESSURE RELIEF VALVE. OPS CHECKED GOOD. OK FOR SERVICE.

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