Service difficulty report · Acm · Boeing 747451

Difficulty date
November 13, 2012
Submitted
November 16, 2012
Operation
Air carrier
Aircraft
N105UA
Make and model
Boeing 747451
Aircraft serial
26473
Aircraft time
75,529 hours, 8,889 cycles
Engine
Pwa PW4056
Part
Acm
Part number
7744694
Part serial
120
Condition
Seized
Location
Ac Bay
Stage of operation
AP
How discovered
O
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

NOISE AND SMOKE NEAR AUX GALLEY JUST PRIOR TO LANDING. CREW REPORT ODOR SMELL, VIBRATION,ABNORMAL NOISE NEAR DOOR 2 GALLEY FLOOR AREA AND FOLLOW BY PACK NR 1 STATUS MSG. CHECK RECIR FAN, CHILLER, OVEN, GAL AND CABIN LIGHT, LAC NR 3 AND PACK NR 2, NR 3 ALL CHECK OK PER MM. FOUND PACK NR 1 ACM SEIZE REF TO DF653 FOR WORK DONE. REPLACED NR 1 ACM, DURING OPS CHECK, COMPRESSOR DISCHARGE TEMP HI. STATUS MSG "PACK 1" DISPLAYED. PACK IS LOCKED OUT WITH DF STICKER ON PACK SWITCH. REPLACED NR 1 PACK COMPRESSOR OUTLET TEMP SENSOR - T1612 -- OPERATIONAL CHECK OF NR 1 PACK SYSTEM OK.