# SDR EPUA20160422001

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 22, 2016
- Submitted: April 29, 2016
- Operation: Air carrier
- Aircraft: [N750RV](https://openairdocs.org/aircraft/N750RV), registered now
- Make and model: Cessna 208B
- Registry model: [Cessna 208B](https://openairdocs.org/model/cessna-208b) (OpenAirDocs)
- Aircraft serial: 208B5194
- Aircraft time: 407 hours
- Engine: Pwa PT6A114
- System (JASC): [7260 · Turbine Engine Accessory Drive](https://openairdocs.org/jasc/7260)
- Part: Drive Assy
- Part number: 260127118
- Condition: Separated
- Location: Engine
- Part time: 407 hours
- Stage of operation: UK
- How discovered: O
- Nature of condition: J
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/EPUA20160422001

## Discrepancy

STANDBY POWER ANNUNCIATOR LIGHT WON’T GO OUT.  INSPECTED ACFT & FOUND THAT THE RETAINING RING FOR THE STANDBY ALTERNATOR DRIVE PULLEY HAD FAILED.  DUE TO THIS FAILURE THE DRIVE PULLEY HAD MIGRATED OUT OF THE HOUSING ASSEMBLY & WAS LYING IN THE ENG COWLING ASSEMBLY.  THE DRIVE ASSEMBLY WAS REPLACED AS AN ASSEMBLY.

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