SDR AT0300004

Service difficulty report · Outflow Valve · Doug DC932

Difficulty date: February 22, 2003
Submitted: February 25, 2003
Operation: Air carrier
Aircraft: N832AT
Make and model: Doug DC932
Aircraft serial: 47451
System (JASC): 2133 · Pressure Regulator/Outflow Valve
Part: Outflow Valve
Condition: Iced
Location: Cabin Pressure
Stage of operation: DE
How discovered: O
Nature of condition: F
Precautionary procedure: O

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

What was found

LOST CABIN PRESSURIZATION AT 20,000 FT IN ICING CONDITIONS. SELECTED MANUAL AND THE VALVE WOULD NOT CLOSE ALL THE WAY. MASKS DROPPED SUSPECT ICING AFTER 30 MINUTE HOLD. OPERATED OUTFLOW VALVE AND PRESSURIZED TO 3 PSI, OPS NORMAL REF MM 21-32. MASK DROPPED CHECK AND REPACK MASK, NO DEFECTS NOTED.

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