# SDR CALA2026090919336

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 7, 2026
- Submitted: September 9, 2026
- Operation: Air carrier
- Aircraft: [N78013](https://openairdocs.org/aircraft/N78013), registered now
- Make and model: Boeing 777224
- Aircraft serial: 29861
- Aircraft time: 126,369 hours, 13,080 cycles
- Engine: Ge GE9094B
- System (JASC): [4990 · APU Oil System](https://openairdocs.org/jasc/4990)
- Part: Lubrication Unit
- Part number: 41310006
- Part serial: 1040
- Condition: Faulted
- Location: Apu
- Stage of operation: NR
- How discovered: O
- Nature of condition: B
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CALA2026090919336

## Discrepancy

LARGE PLUME OF WHITE SMOKE FROM APU EXHAUST ON NORMAL SHUTDOWN.  VERIFIED APU OIL AT A SERVICABLE QTY ON EICAS 5.7 WITH APU OFF. OPERATED APU FOR 30 MINS WITH NO LOAD.  PERFORMED A NORMAL SHUTDOWN & STILL SAW WHITE SMOKE AFTER INTIAL SHUTDOWN.  NO WHITE SMOKE DURING OPS. IAW AMM 49-11-00, 12-13-04,  OPERATED APU AGAIN WITH NORMAL SHUTDOWN, LARGE PLUME OF SMOKE STILL PRESENT. SMOKE SMELLED OF OIL.  REPLACED LUBE CLUSTER IAW FIM 49-10 TASK 836.  REPLACING FUEL CLUSTER AS A PRECAUTION, DUE TO REMOVAL TO GET ACCESS TO LUBE CLUSTER.  R & R APU FUEL & LUBE CLUSTERS IAW AMM 49-31-31, 49-27-27. LEAK CHKD GOOD.   COMPLETED APU FUEL CLUSTER & LUBE CLUSTER INSTALLATION TEST IAW AMM 49-31-31, 49-27-27. OPS CHKD GOOD.

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