# SDR DALA2025011400319

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 13, 2025
- Submitted: January 14, 2025
- Operation: Air carrier
- Aircraft: [N846DN](https://openairdocs.org/aircraft/N846DN), registered now
- Make and model: Boeing 737932ER
- Aircraft serial: 31957
- Aircraft time: 29,908 hours, 11,840 cycles
- System (JASC): [4900 · Airborne Auxiliary Power Unit (APU) System](https://openairdocs.org/jasc/4900)
- Part: Apu
- Condition: Contaminated
- Location: Zone 100
- Stage of operation: TX
- How discovered: O
- Nature of condition: C, B
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/DALA2025011400319

## Discrepancy

SHIP 3846 -SMK- DUE TO SMOKE IN THE COCKPIT WITH APU BLEED. ODOR IN CABIN NOTED. CORRECTIVE ACTION: MAINTENANCE FOUND EVIDENCE OF DE-ICING FLUID IN APU INLET. PERFORMED OIL CONTAMINATION REMOVAL FROM AIR CONDITIONING AND PNEUMATIC SYSTEM PER B737 AMM 21-00. REMOVED AND REPLACED RECIRC FILTERS B737 AMM 21-25.

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