# SDR CALA2026012613257

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 26, 2026
- Submitted: January 27, 2026
- Operation: Air carrier
- Aircraft: [N27421](https://openairdocs.org/aircraft/N27421), registered now
- Make and model: Boeing 737924ER
- Aircraft serial: 37094
- Aircraft time: 55,373 hours, 19,659 cycles
- System (JASC): [4900 · Airborne Auxiliary Power Unit (APU) System](https://openairdocs.org/jasc/4900)
- Part: Apu
- Condition: Odor
- Location: Zone 100
- 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/CALA2026012613257

## Discrepancy

STRONG ODOR OF FUEL ON TAXI TO FL200. ARRIVL BLW130 PAX AND FWD CABIN COMPLAINING SMOKE ODOR REPORT. PERFORMED WALK AROUND BEFORE & AFTER ENG RUN. NO LEAKS FOUND. FIM TASK 21-00 TASK 806 SECTION C.   REPLACED TWO HEPA FILTERS IN FWD PIT,  RAN ENGS SEPERATLY ODOR STILL PRESENT IN CABIN.  ACCOMPLISHED INTERNAL & EXTERNAL, INLET & EXHAUST INSP OF APU BAY,  NO DEFECT NOTED, INSPECT FUEL SHROUD LINE & APU DUCT, AFT OF PRESSURE BULKHEAD, NO DEFECT NOTED, NO FLUID LEAKING OUT OF SHROUD,  ACCOMPLISHED ENG IDLE RUN, WITH ENGS PNEUMATIC AS AIR SOURCE & PACK IN MULTIPLE CONFIGURATION, NO ODOR NOTED, WITH ENGS BLEED ON & TURNING ON APU BLEED, OILY ODOR NOTED IAW 21-00 TASK 830 & AMM 05-51-26-800-801-C1,  PLACED ON MEL DUE TO ODOR  IN CABIN FROM APU BLEED.  SOURCE OF OILY ODOR HAS BEEN T/S DOWN TO APU BLEED AIR. INSP OF APU INLET, EXHAUST, FUEL SHROUD & APU BAY SHOWS NO LEAKS. SOURCE SEEMS TO BE COMING FROM INTERNAL OF APU. REQUIRES APU CHANGE.

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