# SDR 99ZZZX1397

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 3, 1999
- Submitted: March 26, 2000
- Operation: General aviation
- Filed by: [Embry-Riddle Aeronautical University Inc, repair station NX42404M](https://openairdocs.org/faa-repair-station/NX42404M/embry-riddle-aeronautical-university-inc.md) (OpenAirDocs)
- Aircraft: N921ER
- Make and model: Piper PA-44-180
- Registry model: [Piper PA-44-180](https://openairdocs.org/model/piper-pa-44-180) (OpenAirDocs)
- Aircraft serial: 4496008
- System (JASC): [8011 · Engine Starter](https://openairdocs.org/jasc/8011)
- Part: Support
- Part number: LW18506
- Condition: Mismanufactured
- Location: Starter
- Part time: 1,804 hours
- Stage of operation: IN
- Nature of condition: W
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/99ZZZX1397

## Discrepancy

REAR V-BELT GROOVE CASTING MATERIAL THICKNESS OF APPROXIMATELY .024 INCH IS CONSIDERED INSUFFICIENT AND RESULTS IN THE REAR V-BELT GROOVE BEING HIGHLY PRONE TO BREAKAGE. THIS IS ONE OF THREE SEPARATE OCCURRENCES OF REAR V-BELT GROOVE BREAKAGE NOTED THAT SEEM ISOLATED TO PN LW-18506 STARTER RING GEAR SUPPORT ASSEMBLIES. ONE STARTER RING GEAR SUPPORT WAS FOUND BROKEN WHEN RECEIVED FROM THE MANUFACTURER.

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