# SDR CALA2025050704516

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 6, 2025
- Submitted: May 7, 2025
- Operation: Air carrier
- Aircraft: [N37408](https://openairdocs.org/aircraft/N37408), registered now
- Make and model: Boeing 737924
- Aircraft serial: 30125
- Aircraft time: 63,996 hours, 26,818 cycles
- System (JASC): [2120 · Air Distribution System](https://openairdocs.org/jasc/2120)
- Part: Duct
- Condition: Leaking
- Location: Zone 100
- Stage of operation: IN
- How discovered: O
- Nature of condition: B
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CALA2025050704516

## Discrepancy

WHEN TURNING ON BOTH PACK WE HEAR LOW RUMBLE AND SMELL SOMETHING ODD. DUCT PRSR DROPS SIGNIFIC RESECURED FLIGHT DECK AIR DISTRIBUTION SYSTEM MUFFLER/DUCT SLEEVE LOCATED AT DISTRIBUTION BAY REF. AMM 21-22-05-400-801, OPS CHECK GOOD, NO FURTHER RUMBLE OR SMELL NOTED.

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