# SDR 97ZZZX3551

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 25, 1997
- Submitted: March 26, 2000
- Operation: General aviation
- Aircraft: [N99YC](https://openairdocs.org/aircraft/N99YC), registered now
- Make and model: Enstrm F28F
- Aircraft serial: 809
- Engine: Lyc HIO360F1AD
- System (JASC): [8530 · Reciprocating Engine Cylinder Section](https://openairdocs.org/jasc/8530)
- Part: Rocker Shaft
- Condition: Failed
- Location: Nr 2 Cylinder
- Part time: 48 hours
- Stage of operation: NR
- Nature of condition: R
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/97ZZZX3551

## Discrepancy

LOOSE RETAINING NUTS WORKED OFF STUDS ALLOWING THE PORT COVER TO FALL OFF AND NR 2 CYLINDER INTAKE VALVE ROCKER ARM SHAFT TO FALL OUT OF THE ENGINE RESULTING IN A CRASH LANDING. SUGGEST REVIEWING ENSTROM PRODUCTION CERTIFICATE AND TIGHTEN THE INSPECTION PROCEDURE TO REDUCE THE CHANCES THAT ANOTHER HELICOPTER WILL BE RELEASED WITH HIDDEN LOOSE PARTS.

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