CESSNA 414A — Service Manual

This service letter, MEL-54-03, is a mandatory document issued by Textron Aviation that addresses the replacement of engine nacelle fittings on specific aircraft models, including the Cessna 414A. It applies to aircraft with the SK402-47 modification installed and outlines the criteria for determining when nacelle fittings must be replaced based on flight hours. The document emphasizes the importance of compliance to prevent potential flight instability due to fatigue and cracking of the nacelle fittings. It provides detailed instructions for calculating flight hours and references the maintenance manual for replacement procedures. The compliance is mandatory and must be documented in the aircraft logbook.

• Mandatory compliance for nacelle fitting replacement on Cessna 414A with SK402-47 installed.
• Nacelle fittings must be replaced based on flight hours: 1,000 hours or 12 months for certain fittings.
• Flight hours for nacelle fittings are calculated from the airplane logbook.
• Replacement criteria vary by part number and total flight hours.
• Document compliance must be recorded in the aircraft logbook.