# SDR SCNA20260806339

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 4, 2026
- Submitted: August 6, 2026
- Operation: Air carrier
- Aircraft: [N846SY](https://openairdocs.org/aircraft/N846SY), registered now
- Make and model: Boeing 737-800
- Registry model: [Boeing 737-800](https://openairdocs.org/model/boeing-737-800) (OpenAirDocs)
- Aircraft serial: 39025
- Aircraft time: 30,077 hours, 17,443 cycles
- System (JASC): [4920 · APU Core Engine](https://openairdocs.org/jasc/4920)
- Part: Apu
- Condition: Smoke
- Location: Zone 100
- Stage of operation: TX
- 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/SCNA20260806339

## Discrepancy

WHITE SMOKE CAME OUT OF APU EXHAUST AFTER SHUT DOWN.    REF AML 816815 ITEM 1. WHITE SMOKE CAME OUT OF APU EXHAUST AFTER SHUTDOWN.  INSPECTED APU PER FIM 49-95 TASK 801 FOUND SMALL AMOUNT OF OIL FROM AFT DRAIN. FOUND LARGE OIL WETTING ON & AROUND MIDDLE TURBINE BEARING SUPPORT STRUT. PER FIM 49-95 TASK 801 E.1(A) SUGGESTS APU REPLACEMENT.  REMOVED AND REPLACED APU RED TASK CARD 490000000.  OPS TEST NORMAL.  THIS CLEARS MEL 49-1-A  MDDR# 140705. - ADDITIONAL: INSPECTED APU PER FIM 49-95 TASK 801 FOUND SMALL AMOUNT OF OIL FROM AFT DRAIN. FOUND LARGE OIL WETTING ON & AROUND MIDDLE TURBINE BEARING SUPPORT STRUT. PER FIM 49-95 TASK 801 E.1(A) SUGGESTS APU REPLACEMENT.

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