# SDR DALA2019111806740

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 17, 2019
- Submitted: November 18, 2019
- Operation: Air carrier
- Aircraft: N975DL
- Make and model: Doug MD-88
- Registry model: [Doug MD-88](https://openairdocs.org/model/mcdonnell-douglas-md-88) (OpenAirDocs)
- Aircraft serial: 53243
- Aircraft time: 74,352 hours, 55,411 cycles
- System (JASC): [4950 · APU Bleed Air System](https://openairdocs.org/jasc/4950)
- Part: Apu
- Condition: Contaminated
- Stage of operation: IN
- How discovered: O
- Nature of condition: J, B
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/DALA2019111806740

## Discrepancy

CPT SIDE AFT LAV SMOKE DETECTOR ACTIVATED SHORTLY AFTER T.O. LASTED A FEW SECONDS THEN WENT OFF. NO OTHER INDICATIONS OR SIGNS OF SMOKE. FOUND APU INLET CONTAMINATED WITH OIL. SUSPECT ACCESSORY OIL DRAIN. REMOVED AND REPLACED APU REF AMDS W/C 4900-2121. OPS AND LEAK CKS GOOD. PERFORMED DUCT CLEANING REF AMDS W/C 2120 -2368 AND T/S REF W/C 2120-2367. NO OIL IN DUCTING OR VALVES VERIFIED WITH UV LIGHT. PERFORMED FULL DUCT BURN REF W/C 7100- 2619. LT AFT LAV SMOKE DET NEVER WENT OFF DURING POWER RUN. OK FOR SVC. APU, AUXILIARY OFF 88-4910-9-0010 S/N OFF: 80274 (LP6031512)

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