Textron Aviation has released Mandatory Service Letter SEL-28-10 for certain Cessna single engine models. For affected aircraft, some 0756008-1 Fuel Strainer Bowls did not receive the proper corrosion treatment and must be replaced. The service document provides instructions to do a visual inspection of the 0756008-1 Fuel Strainer Bowl. Compliance is mandatory. The service document must be accomplished at the next 100-hour or 12-month (annual-type) inspection.
Relatedly, Textron Aviation has released Mandatory Service Letter MEL-28-02 for certain Cessna 337 models.