SDR DLM88010936

Service difficulty report · Control Valve · Doug MD88

Difficulty date: June 9, 2001
Submitted: June 26, 2001
Operation: Air carrier
Aircraft: N909DE
Make and model: Doug MD88
Aircraft serial: 53418
Aircraft time: 24,409 hours, 19,094 cycles
System (JASC): 2160 · Cabin Temperature Control System
Part: Control Valve
Part number: 32185831
Part serial: 2337
Condition: Faulty
Location: A/C Bay
Stage of operation: CR
How discovered: O
Nature of condition: G
Precautionary procedure: A

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

What was found

AT 31,000 FT RT PACK AIR STUCK IN COLD POSITION, WOULD NOT MOVE. LEFT PACK SUPPLY PRESS DROPPED TO ZERO MOMENTARILY CAUSING CABIN ALT TO CLIMB. DESCEND TO 10,000 FT AND IT HAPPENED AGAIN. ATL MCC 2100Z. FOUND RT PACK MIX VALVE STICKING. REPLACED RT PACK TEMP CONTROL VALVE. RT PACK OPS AND LEAK CHECKS GOOD.

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