SDR CALA2014021090355

Service difficulty report · Cooling Fan · Boeing 747422

Difficulty date: February 7, 2014
Submitted: February 10, 2014
Operation: Air carrier
Aircraft: N179UA
Make and model: Boeing 747422
Aircraft serial: 25158
Aircraft time: 94,260 hours, 11,267 cycles
Engine: Pwa PW4056
System (JASC): 2121 · Air Distribution Fan
Part: Cooling Fan
Condition: Failed
Location: E&E Bay
Stage of operation: CR
How discovered: O
Nature of condition: B
Precautionary procedure: H, A

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

What was found

FAINT ODOR IN FLIGHT DECK & POSSIBLY AROUND DOOR 1R. FOLLOWED CHECKLIST 5.1 SHUTOFF TRIM AIR, NR 2 PACK & SHUTOFF BLEED ISOLATION VLVS TO ISOLATE BLEED SYSTEM AS WELL AS SHUTTING DOWN UTILITY BUSSES. FLIGHT ATTENDANT BROUGHT IN TO CONFIRM PRESENCE OF ODOR DUE TO FLIGHT CREW BECOMING DESENSITIZED TO ODOR UPON TROUBLESHOOTING. FOUND EE COOLING SUPPLY FAN INOPERATIVE PCN 563-9043. R & R SUPPLY COOLING FAN, OPERATIONS CHECKED ARE GOOD WITH NO FURTHER SMELL IN FLIGHT DECK.