Service difficulty report · Seal · Doug DC931

Difficulty date
March 28, 2009
Submitted
April 2, 2009
Operation
Air carrier
Aircraft
N923RW
Make and model
Doug DC931
Aircraft serial
47183
Part
Seal
Condition
Loose
Location
Relief Valve
Stage of operation
CR
How discovered
O
Nature of condition
J
Precautionary procedure
B, G

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

What was found

ACFT WAS IN A DESCENT FROM FL330 TO FL310 WHEN THE CABIN ALT LIGHT CAME ON. FLIGHT CREW DONNED OXYGEN MASKS PERFORMED THE RED BORDERED CABIN PRESSURE LOSS PROCEDURE. THE CABIN WAS STILL AT 11000 FT AND DESCENT TO FL240 WAS INITIATED. AT FL270 THE CABIN CLIMB RATE INCREASED TO 1500 FT PER MIN; AN EMERGENCY WAS DECLARED WAS DECLARED, THE CREW WAS CLEARED MANUALLY ACTIVATED DEPLOYMENT. THE ACFT LEVELED OFF AT 10,000 FT ANT THE CABIN STABILIZED AROUND 8000 FT. DISPATCH RECOMMENDED THE FLIGHT CONTINUE TO DESTINATION. MX FOUND THE LT NEGATIVE RELIEF VALVE SEALS LOOSE AND RESECURED THEM AND ALSO REPLACED BOTH WATER SEPARATORS TEMPERATURE CONTROL VALVES. (K)

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