# SDR NX422026031600012

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 13, 2026
- Submitted: March 16, 2026
- Operation: General aviation
- Filed by: [Embry-Riddle Aeronautical University Inc, repair station NX42404M](https://openairdocs.org/faa-repair-station/NX42404M/embry-riddle-aeronautical-university-inc.md) (OpenAirDocs)
- Aircraft: [N979ER](https://openairdocs.org/aircraft/N979ER), registered now
- Make and model: Cessna 172S
- Registry model: [Cessna 172S](https://openairdocs.org/model/cessna-172s) (OpenAirDocs)
- Engine: Lyc IO360L2A
- Engine time: 2,450 hours
- System (JASC): [8520 · Reciprocating Engine Power Section](https://openairdocs.org/jasc/8520)
- Part: Stud
- Part number: 76220
- Condition: Damaged
- Location: Engine
- Part time: 2,450 hours
- Stage of operation: IN
- How discovered: M
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/NX422026031600012

## Discrepancy

UPON DISASSEMBLY FOR IT'S FIRST OVERHAUL, DAMAGE WAS FOUND ON ONE OF THE THRU STUDS. THE DAMAGE APPEARS TO BE DIPLSACED STEEL UNDER THE THREADED PORTION ON THE SHOULDER OF THE THRU STUD. A RELEVANT INDICATION IS SEEN UNDER MAGNETIC PARTICLE INSPECTION. THE LEFT HAND CRANKCASE OF THIS ENGINE ALSO HAS DAMAGE TO THE INSIDE OF ONE THRU STUD BORE LOCATION.

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