# SDR 2026F00035

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 19, 2026
- Submitted: March 19, 2026
- Operation: General aviation
- Aircraft: [N339QS](https://openairdocs.org/aircraft/N339QS), registered now
- Make and model: Gulstm 680
- Aircraft serial: 6800191
- Aircraft time: 14,278 hours, 9,522 cycles
- System (JASC): [5532 · Vertical Stabilizer, Plate/Skin](https://openairdocs.org/jasc/5532)
- Part: Skin
- Condition: Corroded
- Location: Zone 300
- 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/2026F00035

## Discrepancy

LEFT AND RIGHT VERTICAL STAB UPPER SKINS HAVE 2 AREAS OF CORROSION JUST BELOW TIP CAP. MECHANICALLY REMOVED 2 AREAS OF CORROSION LOCATED ON VERTICAL STAB OUTER SKIN JUST BELOW TIP CAP, AFT AREA, 1 BLEND PER SIDE IAW CESSNA 680 SRM 51-70-02. FOUND CORROSION BLENDS TO BE BEYOND LIMITS IAW SRM 51-70-02 EXCEEDING .002" OF MATERIAL REMOVED FROM NOMINAL THICKNESS. REPAIRED CORROSION BLENDS IAW AQRD RFTS-116341 REV.0, TITLED: N339QS (680-0191) VERTICAL STABILIZER SKIN CORROSION,

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