# SDR 2022F00091

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 23, 2021
- Submitted: February 2, 2022
- Operation: General aviation
- Aircraft: [N7644S](https://openairdocs.org/aircraft/N7644S), registered now
- Make and model: Skrsky S76B
- Aircraft serial: 760314
- Aircraft time: 9,513 hours, 23,416 cycles
- Engine: Pwa PT6B36
- Engine time: 8,653 hours, 12,070 cycles
- System (JASC): [5534 · Vertical Stabilizer Miscellaneous Structure](https://openairdocs.org/jasc/5534)
- Part: Spar Cap
- Part number: 7620105002128
- Part serial: NA
- Condition: Cracked
- Location: Zone 300
- Part time: 9,513 hours, 23,416 cycles
- Component: Tail Rotor Pylo, Skrsky, NA
- Component part number: 7607020534011
- Stage of operation: IN
- How discovered: V
- Nature of condition: P
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2022F00091

## Discrepancy

DURING COMPLIANCE WITH SIKORSKY SERVICE BULLETIN 76-015, A CRACK WAS DISCOVERED RADIATING AROUND THE UPPER LEFT HORIZONTAL STABILIZER ATTACHMENT FITTING BOLT HOLE. THE CRACK WAS INITIALLY DISCOVERED VISUALLY AND CONFIRMED WITH DYE-PENETRANT INSPECTION. THE CRACK IS LIMITED TO THE AFT SPAR CAP ANGLE, SIKORSKY P/N: 76201-05002-128. THIS CRACK IS APPROXIMATELY 5.00 INCHES ABOVE THE AREA THAT IS AFFECTED BY SB 76-015. IN COMMUNICATION WITH SIKORSKY, IT HAS BEEN DETERMINED THAT THE AFT SPAR CAP ANGLE REQUIRES REPLACEMENT.

---
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.