# SDR NX422026021800007

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 17, 2026
- Submitted: February 18, 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: [N909ER](https://openairdocs.org/aircraft/N909ER), registered now
- Make and model: Cessna 172S
- Registry model: [Cessna 172S](https://openairdocs.org/model/cessna-172s) (OpenAirDocs)
- Engine: Lyc IO360L2A
- Engine time: 2,449 hours
- System (JASC): [8520 · Reciprocating Engine Power Section](https://openairdocs.org/jasc/8520)
- Part: Crankcase
- Part number: LW184025
- Condition: Gouged
- Location: Engine
- Part time: 2,449 hours
- 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/NX422026021800007

## Discrepancy

UPON DISASSEMBLY FOR ITS FIRST OVERHAUL, DAMAGE WAS FOUND ON THE LEFT HAND CRANCASE TO ALL 4 THRU STUD LOCATIONS. THE DAMAGE APPEARS TO BE A GOUGE WITH DISPLACED METAL JUST UNDER THE CYLINDER PAD INSIDE THE THRU STUD BORE. ON THREE OF THE THRU STUD BORES THE DAMAGE IS MINIMAL BUT VERY SIMILAR TO DAMAGE ON OTHER ENGINES THAT HAVE BEEN PREVIOUSLY REPORTED. IN ADDITION, 2 OF THE THRU STUDS HAVE DISPLACED STEEL UNDER THE THREADED PORTION ON THE SHOULDER OF THE THRU STUD.

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