SDR KCSA11051

Service difficulty report · Cooling Fan · Boeing 747212B

Difficulty date: September 2, 2011
Submitted: September 6, 2011
Operation: Air carrier
Aircraft: N708CK
Make and model: Boeing 747212B
Aircraft serial: 21937
Aircraft time: 100,282 hours, 18,914 cycles
System (JASC): 2121 · Air Distribution Fan
Part: Cooling Fan
Condition: Inoperative
Location: Cockpit
Stage of operation: DE
How discovered: O
Nature of condition: B, J
Precautionary procedure: K

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

What was found

AT 16,000FT ALTITUDE, DESCENT TO OAKN SMELLED FUMES IN COCKPIT. OBSERVED NUMBER 1 PACK TRIP LIGHT ILLUMINATED. BYPASS VALVE INLET/EXIT DOOR'S PROPERLY PREPOSITIONED. TURNED OFF FLIGHT DECK FAN AND WENT ON O2. DID NOT RESET PACK OR FAN. RESET PACK TRIP LIGHT. DID TROUBLESHOOTING PER FIM 21-50-00, 21-50 HD AND B747 MM 21-51-00. FOUND NO FAULTS AT THIS TIME. NUMBER 1 PACK OPERATES NORMAL IAW B747 MM 21-51-00. NO DEFECTS NOTED. FLIGHT DECK RECIRCULATION FAN INOPERATIVE. THIS IS TRANSFERRED TO DMI 70800394.

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