# SDR 2026FA0000612

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 30, 2026
- Submitted: July 31, 2026
- Operation: General aviation
- Aircraft: [N530JP](https://openairdocs.org/aircraft/N530JP), registered now
- Make and model: Mooney M20M
- Registry model: [Mooney M20M](https://openairdocs.org/model/mooney-m20m) (OpenAirDocs)
- Aircraft serial: 270114
- Engine: Lyc TIO540AF1B
- Propeller: Mcauly B3D32C417
- System (JASC): [7421 · Spark Plug/Igniter](https://openairdocs.org/jasc/7421)
- Part: Spark Plug
- Part number: URHB32S
- Condition: Cracked
- Location: Engine
- Part time: 63 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/2026FA0000612

## Discrepancy

SPARK PLUGS, TEMPEST: UPON REMOVAL, 4 OF THE 12 SPARK PLUGS, FOUND TO HAVE CIRCUMFERENTIAL CRACKS IN STEEL SHELL, LOCATED IN REDUCED ALL HOT CRIMP (SWAGE) SECTION BETWEEN THE MOUNTING GASKET SEAT & WRENCHING HEX. CRACKS ARE JAGGED & IRREGULAR, EXTEND AROUND A MAJORITY OF THE SHELL CIRCUMFERENCE, & ARE VISUALLY DISTINCT FROM THE NORMAL MACHINED STEP AND FACTORY HEATING BAND IN THIS AREA. SHELL MARKINGS ON THE INSERVICE PLUGS: X061/OPDA. (2) FACTORYNEW PLUGS: BASED ON THE ABOVE FINDINGS, REPLACEMENT OF ALL 12 PLUGS WAS ELECTED.  DURING PREINSTALLATION INSPECTION, 7 OF THE 12 NEW PLUGS WERE FOUND CRACKED AT THE SAME SHELL LOCATION. THESE PLUGS ARE NEW IN ORIGINAL FACTORY PACKAGING & HAVE NEVER BEEN INSTALLED,  TORQUED, OR EXPOSED TO ENGINE OPERATION. CRACKS RANGE FROM PARTIAL CIRCUMFERENCE FISSURES TO NEAR COMPLETE CIRCUMFERENTIAL.

---
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.