# SDR AALA202504012772

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 24, 2025
- Submitted: April 1, 2025
- Operation: Air carrier
- Aircraft: [N972AN](https://openairdocs.org/aircraft/N972AN), registered now
- Make and model: Boeing 737823
- Aircraft serial: 30097
- Aircraft time: 66,820 hours, 28,229 cycles
- System (JASC): [4950 · APU Bleed Air System](https://openairdocs.org/jasc/4950)
- Part: O-Ring
- Condition: Cut
- Location: Apu
- Stage of operation: TX
- How discovered: O
- Nature of condition: B
- Precautionary procedure: D
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA202504012772

## Discrepancy

AIRCRAFT WAS GROUNDED: ABOUT 5 MINUTES AFTER ENGINE START CABIN WAS NOT COOLING DOWN. WE SWITCHED TO MAX COOLING FROM THE APU. ABOUT 30 MINUTES LATER 3 OF 4 FLIGHT ATTENDANT AND SOME PASSENGERS COMPLAINED OF SMELLING FUMES AND ASLIGHT HEADACHE. IT WAS MOSTLY AT THE REAR OF THE CABIN.   REPLACED O-RING "SEAL" (AALA202503252772) BETWEEN APU "B" FCU AND OIL LUBE UNIT, PER AMM 49-31-11. REMOVE AND REPLACED ELEVATOR A/P "B" ACTUATOR (AALA202504014312), PER AMM 22-11-26. CLEANED APU COMPRTMENT, PER AMM 49-16-11. ACCOMPLISHED SOF TROUBLESHOOTING J/C #08L00021001. NO ODOR ADDTIONAL ENCOUNTERED.

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