# SDR LJER950516

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 16, 1995
- Submitted: March 26, 2000
- Operation: General aviation
- Filed by: [Hillsboro Aviation Inc, repair station LJER093G](https://openairdocs.org/faa-repair-station/LJER093G/hillsboro-aviation-inc.md) (OpenAirDocs)
- Aircraft: N511TT
- Make and model: Robsin R22ALPHA
- Aircraft serial: 0439
- System (JASC): [6520 · Tail Rotor Gearbox](https://openairdocs.org/jasc/6520)
- Part: Gearbox
- Part number: A1111
- Condition: Under Torque
- Location: T/R
- Component: A0211
- 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/LJER950516

## Discrepancy

TAIL ROTOR GEARBOX OUTPUT SHAFT RETAINING NUT, PN MS1414526, WAS FOUND SLIPPING AND UNDERTORQUED.  DURING 100-HOUR INSPECTION, TAIL ROTOR BLADE ROTATION NOTED MOVING MORE THAN NORMAL GEAR BACKLASH.  TEAR DOWN OF THE T/R GEARBOX REVEALED NUT TORQUED TO 75 INCHES/POUNDS VS 250 AND WASHER AND KEY WERE WORN.  THIS GEARBOX WAS NOT SUBJECT TO AD 94-17-07.  THE MANUFACTURER DOES NOT PUBLISH INSPECTION CRITERIA IN THIS AREA.  A/C TT 6229.3  (X)

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