# SDR MALA020335

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 8, 2002
- Submitted: August 12, 2002
- Operation: Air carrier
- Aircraft: N453XJ
- Make and model: Saab 340B
- Registry model: [Saab 340B](https://openairdocs.org/model/saab-340b) (OpenAirDocs)
- Aircraft serial: 340B453
- Aircraft time: 1,643 hours, 1,931 cycles
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: Motor
- Part number: 11341041
- Part serial: 1094
- Condition: Malfunctioned
- Location: A/C System
- 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/MALA020335

## Discrepancy

DURING PREFLIGHT OF FLIGHT 3031, WHILE PARKED AT CMI ON THE GROUND AFTER A/C QUIT, WITH  EXTERNAL POWER ON, SMOKE DISCOVERED COMING FROM AVIONICS BAY.  SMOKE IN THE CABIN ON PREFLIGHT, DEPLANED PASSENGERS.  MAINTENANCE INSPECTED AVIONICS BAY/ AVIONICS EQUIPMENT FOR CONDITION, SECURITY, CHECKS ARE GOOD.  SUSPECT SMOKE WAS COMING FROM SUPPLEMENTAL A/C UNIT, DEFERRED.  RAN AVIONICS FAN ON EX POWER, NO DISCREPANCIES NOTED.  RAN AVIONICS FAN FROM GEN POWER WITH A/C PACKS ON, NO DISCREPANCIES NOTED.  MAINTENANCE REPLACED COMPRESSOR MOTOR, RECEIVER/DRYER COMPRESSOR BELT GAUD REF MM 409 144407 AND CONTINUATION PG 071315 &16 REPLACED BELT COVER ASSY.

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