SCHWEIZER 269 C — Service Bulletins

This document is a service bulletin for the Schweizer model 269 helicopters, detailing a one-time inspection and the implementation of a recurring inspection for the tail rotor drive shaft splined fittings. It outlines the necessary steps to ensure the integrity and lubrication of these components to prevent potential failures.

• Applies to Schweizer model 269A, A-1, TH-55A, 269B, and 269C helicopters.
• One-time inspection of tail rotor drive shaft splines is required within 100 flight hours or 60 days.
• Recurring visual inspections of the tail rotor drive shaft splines must be implemented after the initial inspection.
• Excessive spline wear can lead to decoupling of the tail rotor drive shaft.
• Inspection includes cleaning, lubricating, and measuring spline wear.
• Components exceeding wear limits must be removed from service and returned to Sikorsky.
• Compliance with the inspection is essential for safety.
• No special materials or tooling are required beyond standard maintenance supplies.