# SDR BTEA2012FA0000554

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 10, 2012
- Submitted: August 10, 2012
- Operation: Air carrier
- Aircraft: [N176BA](https://openairdocs.org/aircraft/N176BA), registered now
- Make and model: Skrsky S76B
- Aircraft serial: 760317
- Aircraft time: 11,309 hours, 36,343 cycles
- System (JASC): [2435 · Starter-Generator](https://openairdocs.org/jasc/2435)
- Part: Starter Gen
- Part number: 23032001
- Condition: Failed
- Stage of operation: AA
- How discovered: O
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/BTEA2012FA0000554

## Discrepancy

WHEN THE AIR CONDITIONER WAS TURNED ON, THERE WAS A "POPPING" SOUND IN THE INTERCOMM SYSTEM IN CREW HELMETS.  THIS WAS ACCOMPANIED BY AN "AUX BATTERY" LIGHT.  INSPECTION OF NR 2 STARTER GEN SHOWED SIGNIFCANT WEAR OF BRUSHES AND AN UNUSUAL WEAR PATTERN ON THE COMMUTATOR.  STARTER GEN WAS REPLACED.  NOISE WENT AWAY. THERE WAS A SECONDARY DEFECT WITH THE CURRENT LIMITER FOR THE SYSTEM.  THAT UNIT WAS REPLACED AND ALL FUNCTIONS RETURNED TO NORMAL.

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