This article was provided by the FAA Aircraft Certification Office (ACO) Airframe, Propulsion and Services (ACE-118W) located in Wichita, Kansas.

While conducting an annual inspection on a Cessna Model 414A, the technician discovered severe corrosion on both wings upper aft spar attachment fittings. This is the second aircraft in a few months that displayed corrosion on both wings upper aft spar attachment fittings.

Cessna has revised all Model 400 Series Supplemental Inspection Documents (SIDs) contained in the aircraft maintenance manual. The SIDs require a visual inspection to detect corrosion on the forward and aft wing upper attachment fittings. If cracks or corrosion are detected, the SIDs require the replacement of the wing attach fitting.

The FAA recommends that all owners and operators of the affected models comply with the revised SIDs and visually inspect the forward and aft upper attachment.