# SDR QMLA2015050715037

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 7, 2015
- Submitted: May 8, 2015
- Operation: Air carrier
- Aircraft: [N900UM](https://openairdocs.org/aircraft/N900UM), registered now
- Make and model: Doug MD 900
- Registry model: [Doug MD 900](https://openairdocs.org/model/mcdonnell-douglas-helicopter-md-900) (OpenAirDocs)
- Aircraft serial: 00112
- Aircraft time: 2,387 hours, 9,942 cycles
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: Motor
- Part number: 900P3250333105
- Condition: Faulty
- Location: Ac Bay
- Stage of operation: DE
- 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/QMLA2015050715037

## Discrepancy

UPON DESCENT DURING FINAL APPROACH TO LANDING SITE, THE PILOT & CREW REPORTED TO EACH OTHER THE DETECTION OF AN ELEC BURNING ODOR THAT CONTINUED TO GET STRONGER.  AFTER LANDING & POWERING DOWN WITHIN SECONDS THE ODOR DISSIPATED.  TROUBLE SHOT SYS & FOUND THAT THE AIR CONDITIONING BLOWER MOTOR TO BE THE CAUSE OF THE THE ODOR.  MEL'D THE SYS, PULLED & COLLARED CB'S TO PREVENT FURTHER OCCURRENCES.

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