# SDR 97ZZZX2553

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 12, 1997
- Submitted: March 26, 2000
- Operation: General aviation
- Aircraft: [N91GT](https://openairdocs.org/aircraft/N91GT), registered now
- Make and model: Snias AS350B
- Aircraft serial: 1289
- System (JASC): [6520 · Tail Rotor Gearbox](https://openairdocs.org/jasc/6520)
- Part: Hub
- Condition: Bolt Seized
- Location: T/R Gearbox
- Part time: 3,140 hours
- Stage of operation: AP
- Nature of condition: W
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/97ZZZX2553

## Discrepancy

DURING REMOVAL OF T/R HUB, HUB RETAINING BOLT WAS VERY HARD TO REMOVE.  UPON INSPECTION OF BOLT, FOUND SIGNS THAT BOLT WAS INSTALLED WITH (RED) LOCTITE INSTEAD OF LOCTITE 242 (BLUE).  MWC 65.20.00.401 PARA 4 STATES TO APPLY LOCTITE 242 (BLUE) TO THREADS.  AFTER TALKING TO ANOTHER REPAIR STATION ABOUT THIS PROBLEM, THEY STATED THAT 80 PERCENT OF THE GEARBOXES THEY OVERHAUL/REPAIR GET RED LOCTITE; THUS, GOING AGAINST THE AIRCRAFT MANUFACTURER'S OVERHAUL/REPAIR PROCEDURES.

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