# SDR 2007F00065

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 16, 2007
- Submitted: October 31, 2007
- Operation: General aviation
- Aircraft: [N4040P](https://openairdocs.org/aircraft/N4040P), registered now
- Make and model: Bell UH-1F
- Registry model: [Bell UH-1F](https://openairdocs.org/model/bell-uh-1f) (OpenAirDocs)
- Aircraft serial: 657911
- Engine: Ge T58GE3
- System (JASC): [6320 · Main Rotor Gearbox](https://openairdocs.org/jasc/6320)
- Part: Transmission
- Part number: 204040016005
- Part serial: ABU12548
- Condition: Cracked
- Location: Main Rotor
- 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/2007F00065

## Discrepancy

CRACK FOUND ON MAIN GEARBOX (TRANSMISSION IN VERTICAL CAST WEBBING ABOVE ENGINE TO TRANSMISSION DRIVE QUILL.  MILITARY TECHNICAL MANUAL ALLOWS .2500 INCH RADIUS/POLISH INTO WEBBING THIS CRACK HAS BEEN FOUND ON THREE (3 EACH) TRANSMISSIONS ON OTHER AC WITH ONE PENETRATING THE GEARBOX AND LEAKING FLUID.  (K)

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