# SDR 2021F00253

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 3, 2021
- Submitted: October 3, 2021
- Operation: General aviation
- Aircraft: [N559QS](https://openairdocs.org/aircraft/N559QS), registered now
- Make and model: Cessna 680A
- Registry model: [Cessna 680A](https://openairdocs.org/model/cessna-680a) (OpenAirDocs)
- Aircraft serial: 680A0090
- Aircraft time: 3,999 hours, 2,691 cycles
- Engine: Pwc PW306D1
- Engine time: 3,999 hours, 2,691 cycles
- System (JASC): [8300 · Accessory Gearboxes](https://openairdocs.org/jasc/8300)
- Part: Cover
- Condition: Corroded
- Location: Accessory G/B
- Part time: 3,999 hours, 2,691 cycles
- 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/2021F00253

## Discrepancy

THE ACCESSORY GEARBOX REAR COVER IS CORRODING ON THE FLANGES AND AROUND BOLT HOLES. ACCOMPLISHED STEPS (1) THRU (4) OF THE REPAIR OF CORROSION OR PITTING ON ABG MOUNT PADS AND EXTERNAL SURFACES. INSPECT AGAIN AND REPEAT STEPS (1) THRU (4) AT EVERY AIRCRAFT MINOR INSPECTION UNTIL A PERMANENT REPAIR IS PERFORMED IAW P&WC 306D1 MM 72-60-01 REV. 17.1. PER NETJETS A, REINSPECTION ALIGNS WITH THE 1A (800 HR) AIRFRAME INSPECTION.

---
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.