Service difficulty report · Oil System · Boeing 7673CB

Difficulty date
May 12, 2026
Submitted
May 13, 2026
Operation
Air carrier
Aircraft
N685UA
Make and model
Boeing 7673CB
Aircraft serial
33467
Aircraft time
79,497 hours, 13,736 cycles
Engine
Pwa PW4060
Engine time
2,549 hours, 339 cycles
Part
Oil System
Condition
Leaking
Location
Zone 400
Stage of operation
TX
How discovered
O
Nature of condition
K, J
Precautionary procedure
D

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

What was found

POWER PLANT OIL QUANTITY (01=L ENG, 02=R ENG) ZERO, ENGINE OIL P RESSURE WAS (ZERO, LOW) R ENG OIL QUANTITY AND PRESSURE AT 0 AFTER START. ENGINE OIL WAS 22 PRIOR TO START ENG 2 CREW REPORTED THAT RIGHT ENGINE WAS STARTED WITH NORMAL OIL PRESS / QTY, BUT OIL WENT TO ZERO DURING START, REACHED IDLE THEN, SHUTDOWN PER CHECK LIST. ALSO RAMP REPORTED OIL LEAK PUDDLE UNDER ENGINE. WHQLM-EMC ARSHAD. 12MAY26. CREW DEBRIEFED. ENG REACHED IDLE AND OIL PX THEN DROPPED TO ZERO FOLLOWED BY OIL QTY TO ZERO. ENGINE SHUT DOWN 30SECS INTO STABLE IDLE CONDITION. VIBS NOTED TO BE NORMAL. OIL LEAKAGE FOUND IN INLET AND COLD STREAM AS WELL AS CORE COWLINGS. RH GEAR NO4+8 EVIDENCE OF ENG OIL CONTAMINATION. INITIAL GVI FOUND B NUT/HOSE COMPLETELY OFF ON FUEL/OIL COOLER, ENG OIL OUT PORT. R ENG OIL READING ZERO. OIL ADDED: 28QTS. PLEASE RECHECK AFTER INITIAL DRY RUN AND IDLE RUN. AFTER CONSULTING TOMC, SEPARATE LP ITEMS RAISED FOR ALL REQD WORK, BUT NOT LIMITED TO, DEPENDENT ON FURTHER FINDINGS. ACFT SWAPPED AND NOW TOWING TO HGR FACILITY MAIN BEARING STRAINER HOUSING AND OIL INDICATION TUBE CHECKED FOR SECURITY AND ANY DAMAGE. NO FURTHER DEFECTS FOUND. DRY MOTOR, COMPRESSOR WASH AND ENGINE RUN CARRIED OUT IACHECKED AFTER ENGINE RUN AND STABLE AT 22 QUARTS. CONSIDERED SERVICEABLE.

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