# SDR 2015FA0000594

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 12, 2015
- Submitted: November 19, 2015
- Operation: General aviation
- Aircraft: N590PU
- Make and model: Cirrus SR20
- Registry model: [Cirrus SR20](https://openairdocs.org/model/cirrus-design-sr20) (OpenAirDocs)
- Aircraft serial: 2051
- Aircraft time: 2,431 hours
- Engine: Cont IO360ES
- Engine time: 344 hours
- System (JASC): [2421 · AC Generator-Alternator](https://openairdocs.org/jasc/2421)
- Part: Cooling Fan
- Part number: ES4137
- Condition: Loose
- Location: Alternator
- Part time: 344 hours
- Component: Alternator, Cont, ES4029
- Component part number: 653344
- Stage of operation: IN
- How discovered: V
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2015FA0000594

## Discrepancy

DURING A CIRRUS PROGRESSIVE INSPECTION PROGRAM PHASE 2 INSPECTION DISCOVERED ALTERNATOR NR 2 COOLING FAN LOOSE ON ALTERNATOR SHAFT.  FAN, PN: ES4137 IS PART OF ALTERNATOR, PN: 653344.  THE KEY WAY OF THE FAN HUB WEARS PREMATURELY ALLOWING ROTATIONAL MOVEMENT OF THE FAN ON THE SHAFT.  WE HAVE SEEN THIS CONDITION ON SEVERAL OF THESE ALTERNATORS RECENTLY.

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