SDR UPS98226858

Service difficulty report · Control Valve · Boeing 72725C

Difficulty date: June 10, 1998
Submitted: March 26, 2000
Operation: Air carrier
Aircraft: N933UP
Make and model: Boeing 72725C
Aircraft serial: 19857
System (JASC): 2120 · Air Distribution System
Part: Control Valve
Condition: Failed
Location: Lt Pack
Stage of operation: LD
Nature of condition: B
Precautionary procedure: O

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

What was found

INSPECTION TYPE N/A, LEFT PACK TRIPPED OFF LIGHT ON LANDING ROLLOUT. LEFT PACK SWITCH DID NOT TURN OFF, WHITE SMOKE ENTERED COCKPIT. LOST CONTROL OF PACK EVEN WITH SWITCH OFF. LEFT PACK VLV STUCK OPEN, CYCLED VLV TO CLOSED POSITION AND ITEM DEFERRED PER MEL 21-2-2 ACCOMPLISHED DMP PROCEDURES 21-2-1.

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