# SDR 2026FA0000153

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 20, 2025
- Submitted: March 3, 2026
- Operation: General aviation
- Aircraft: [N421KM](https://openairdocs.org/aircraft/N421KM), registered now
- Make and model: Cessna 421C
- Registry model: [Cessna 421C](https://openairdocs.org/model/cessna-421c) (OpenAirDocs)
- Aircraft serial: 421C0006
- Aircraft time: 5,516 hours
- System (JASC): [5740 · Wing, Attach Fittings](https://openairdocs.org/jasc/5740)
- Part: Attach Fitting
- Part number: 082255015
- Condition: Cracked
- Location: Zone 500
- Part time: 5,516 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/2026FA0000153

## Discrepancy

LEFT WING FORWARD SPAR, OUTBOARD UPPER AFT-FACING WING ATTACH FITTING WAS FOUND TO BE CRACKED WITHIN GEAR WELL. THE PART IS SHOWN IN THE 421C IPC, SECTION 03-50, PAGE 16, ITEM 6. THE CRACK MEASURES ROUGHLY 5-1/8" AND RUNS HORIZONTALLY ACROSS SEVEN RIVET HOLES. IT WAS DISCOVERED DURING THE VISUAL INSPECTION DESCRIBED IN THE 421C SERVICE MANUAL SECTION 2-20 "INSPECTION TIME LIMITS", PAGE 17, SECTION W. (WINGS), "WINGS - INSPECT STRUCTURE AND ATTACH POINTS FOR CONDITION AND SECURITY". PARTS REPLACEMENT WAS REQUIRED.

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