Service difficulty report · Control Valve · Boeing 757225

Difficulty date
April 3, 2012
Submitted
April 4, 2012
Operation
Air carrier
Aircraft
N941FD
Make and model
Boeing 757225
Aircraft serial
22691
Aircraft time
68,188 hours, 27,035 cycles
Part
Control Valve
Part number
3964801
Part serial
535
Condition
Inoperative
Location
Rt A/C Pack
Stage of operation
DE
How discovered
O
Nature of condition
O
Precautionary procedure
B, G, I

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

What was found

RT PACK TRIPPED OFF ON DECENT LEAVING FL 350 (LT PACK IS STILL MEL'D) FOLLOWED QRH, EMERG DECENT TO 10,000", RT PACK CYCLED ON AND OFF REST OF FLIGHT. REMOVED AND REPLACED RIGHT PACK FLOW CONTROL AND SHUTOFF VALVE IAW MM 21-51-01-2 AND REMOVED AND REPLACED RIGHT FLOW CONTROL CARD ASSEMBLY IAW MM 21-51-09-4. PERFORMED COOLING PACK SYSTEM- ADJUSTMENT/TEST IAW MM 21-51-00-5. COOLING PACK SYSTEMS OPS CHECKS GOOD, OK FOR SERVICE.