# SDR 4VAA2018082019004

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 19, 2018
- Submitted: August 20, 2018
- Operation: Air carrier
- Aircraft: [N825HK](https://openairdocs.org/aircraft/N825HK), registered now
- Make and model: Emb EMB-145LR
- Registry model: [EMB EMB-145LR](https://openairdocs.org/model/embraer-emb-145lr) (OpenAirDocs)
- Aircraft serial: 145510
- Aircraft time: 38,483 hours, 32,068 cycles
- Engine: Rroyce AE3007A1
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: Acm
- Part number: 8152403
- Part serial: 200201192
- Condition: Failed
- Location: Right
- Stage of operation: CL
- How discovered: O
- Nature of condition: B
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/4VAA2018082019004

## Discrepancy

AFTER TAKEOFF, CREW RECEIVED A NR 2 PACK 2 OVERLOAD AMBER CAS MESSAGE.  FLIGHT ATTENDANT HEARD A LOUD BANG AND SMELLED ELECTRICAL SMOKE. CREW RETURNED TO DEPARTURE AND LANDED WITHOUT INCIDENT. 
MAINTENANCE REPORTED THE RIGHT AIR CYCLE MACHINE HAD FAILED.  THE ACM WAS REPLACED.

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