# SDR DALA2026051302985

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 12, 2026
- Submitted: May 13, 2026
- Operation: Air carrier
- Aircraft: [N860DN](https://openairdocs.org/aircraft/N860DN), registered now
- Make and model: Boeing 737932ER
- Aircraft serial: 31971
- Aircraft time: 31,323 hours, 12,044 cycles
- System (JASC): [4990 · APU Oil System](https://openairdocs.org/jasc/4990)
- Part: Oil System
- Condition: Leaking
- Location: Apu
- Stage of operation: DE
- How discovered: O
- Nature of condition: K, B
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/DALA2026051302985

## Discrepancy

DESCENDING THROUGH 4000 CA AND FO BOTH BEGAN TO SMELL A DIRTY SOCK FUME. THE SMELL BECAME STRONGER AND SLIGHTLY MORE ACRID DURING THE REMAINDER OF THE DESCENT. FWD FA'SQUIRED BUT DID NOT SMELL THE ODOR. UPON LANDING THE COCKPIT WINDOWS WERE OPENED AND THE ODOR DISAPATED. FOUND OIL PUDDLING IN EXHAUST SLEEVE AREA AFT. ENG SHUTDOWN PER B737 AMM 71-71-00-200-801. F00 PAPA 9. OIL CONSUMPTION NORMAL. OIL PUDDLING IS ACCEPTABLE. PER MCC PERFORMED STEPS TO REMOVE OIL DECONTAMINATION FROM APU. LT ENG AND RT ENG. PNEUMATIC DUCT BURN PER B737 AMM 21-00-01-100-501 SUBTASK 860-005/860-009/860-016. RUN PACKS. NO ODOR NOTED. (LOG 8603966 - AIRCRAFT WAS GROUNDED).

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