SDR 2001UALA00036

Service difficulty report · Seal · Boeing 777222

Difficulty date: January 18, 2001
Submitted: March 7, 2001
Operation: Air carrier
Aircraft: N768UA
Make and model: Boeing 777222
Aircraft serial: 26919
Aircraft time: 24,052 hours, 4,720 cycles
Engine: Pwa PW4077
System (JASC): 4920 · APU Core Engine
Part: Seal
Part number: 38223643
Condition: Damaged
Location: Apu
Part time: 10,570 hours, 7,259 cycles
Stage of operation: NR
How discovered: O
Nature of condition: B, J
Precautionary procedure: O

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

What was found

CREW REPORTED ODOR AND THIN SMOKE LAYER IN CABIN. AFTER TAKE-OFF NOTED FLUX PACK FLOW AND TEMPS, ALSO HAD ASSOCIATED ECON COOL VLV L AND TRIM AIR PRESS SOV RT, SELECTING TRIM AIR OFF CLEARED MSGS CAME BACK WITH TRIM AIR ON. *S/D* APU WAS REMOVED ON 1/21/01 DUE TO METAL SHAVINGS FOUND ON GEARBOX CHIP DETECTOR. SHOP DISASSEMBLED APU ENGINE AND CONFIRMED METAL. UPON FURTHER DISASSEMBLY OF LOAD COMPRESSOR, SHOP FOUND SEAL ROTOR HEAVILY SCORED AND CARBON SEAL DAMAGED. PARTS WILL BE REPLACED, ENGINE REASSEMBLED, AND TESTED.