# SDR HNAA2025092900651

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 28, 2025
- Submitted: September 29, 2025
- Operation: Air carrier
- Aircraft: [N637AE](https://openairdocs.org/aircraft/N637AE), registered now
- Make and model: Emb EMB-145LR
- Registry model: [EMB EMB-145LR](https://openairdocs.org/model/embraer-emb-145lr) (OpenAirDocs)
- Aircraft serial: 145170
- Aircraft time: 54,815 hours, 52,847 cycles
- System (JASC): [2120 · Air Distribution System](https://openairdocs.org/jasc/2120)
- Part: Acm
- Part number: 8152403
- Part serial: 9904015
- Condition: Smoke
- Location: Cockpit
- Part time: 52,834 hours, 49,194 cycles
- Stage of operation: CR
- How discovered: O
- Nature of condition: B
- Precautionary procedure: B
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/HNAA2025092900651

## Discrepancy

SMOKE IN FLIGHT DECK AT CRUISE.    SUSPECT PACK #1'S ACM TO BE INOP CAUSING SMOKE TO UNIT IN FLIGHT DECK.  AIR COND PACK ELECTRO/MECH N600-N649.   FACT  29SEP25  05:36  MDT  FOUND ACM TURBINE RUBBING. R & R NR 100 ACM IRT AMM 21-51-03. R & R NR 100 HEAT EXCHANGER IRT AMM 21-51-02 DUE TO HISTORY. OPS AND LEAK CHECK GOOD.

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