SDR AALA202405263157

Service difficulty report · Carbon Seal · Airbus A321231

Difficulty date: May 19, 2024
Submitted: May 26, 2024
Operation: Air carrier
Aircraft: N534UW
Make and model: Airbus A321231
Aircraft serial: 3989
Aircraft time: 50,080 hours, 18,975 cycles
System (JASC): 4900 · Airborne Auxiliary Power Unit (APU) System
Part: Carbon Seal
Part number: 38631041
Condition: Leaking
Location: Separator
Stage of operation: DE
How discovered: 9
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

AIRCRAFT WAS GROUNDED: FLIGHT CREW STRONG DIRTY SOCK ODOR IN FLIGHT DECK DURING DECENT THROUGH 10,000 FEET. MAINTENANCE REPLACED THE APU GEARBOX VENT TUBE DUE TO COKING, REPLACED THE AIR/OIL SEPERATOR CARBON SEAL (AALA202405263157) AND THE APU OIL COOLING FAN SHAFT O-RING (AALA202405265159). A SATISFACTORY LEAK / OPERATIONAL CHECK WAS ACCOMPLISHED.

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