# SDR ASAA2023032242637

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 22, 2023
- Submitted: March 30, 2023
- Operation: Air carrier
- Aircraft: [N531AS](https://openairdocs.org/aircraft/N531AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35199
- Aircraft time: 45,165 hours, 13,080 cycles
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: Diffuser
- Part number: 22156283
- Condition: Unknown
- Location: Right Ecs Bay
- Stage of operation: IN
- How discovered: V
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2023032242637

## Discrepancy

REF ASA TSR 714008 ON STEP 3, FOUND FAN BYPASS CHECK VALVE WAS MISSING REF B737-800 AMM 21-51-03. ON RH PACK. GROUNDED - YES. REMOVED AND REPLACED PRIMARY HEAT EXCHANGER PLENUM AND DIFFUSER REF B737-800 AMM 21-51-03-400-804, OPS AND LEAK CHECK GOOD.

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