# SDR AU971456

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 17, 1997
- Submitted: March 26, 2000
- Operation: General aviation
- Make and model: Bell 412
- Registry model: [Bell 412](https://openairdocs.org/model/bell-412) (OpenAirDocs)
- Engine: Pwa PT6T3B
- System (JASC): [6710 · Main Rotor Control](https://openairdocs.org/jasc/6710)
- Part: Bolt
- Part number: 25743H
- Condition: Incorrect Part
- Location: M/R Control
- Component: Bell
- Stage of operation: IN
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AU971456

## Discrepancy

(AUS) COLLECTIVE LEVER ASSEMBLY PIN PNO 412-010-422-103 FALLEN OUT. THE PIN IS LOCATED ON THE TRANSMISSION CASING. BOLT PNO 20-057-4-3H AND WASHER PNO AN460-416 WAS ATTACHED TO THE PIN WITH LOCKWIRE. INVESTIGATION FOUND THAT THE BOLT PNO 20-057-4-3H WAS THE INCORRECT PART, THE CORRECT PART NUMBER WAS PNO NAS6604H5 WHICH IS 3.175MM (0.125IN) LONGER. THE REMAINING COLLECTIVE LEVER PIN ALLOWED THE COLLECTIVE LEVER PNO 412-010-401-109 TO BE MISALIGNED RESULTING IN THE LEVER RUBBING ON THE MAIN ROTOR MAST.PERSONNEL/MAINTENANCE ERROR. UNAPPROVED PART.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.