ENSTROM F28F — Service Bulletins

This Service Information Letter (SIL) provides detailed instructions for the replacement of the pilot and copilot collective stick sockets in various Enstrom helicopter models. It includes compliance requirements, safety precautions, and step-by-step procedures for the replacement process.

• Applicable to F28A, 280, F28C, 280C, F28F, 280F, and 280FX helicopters.
• Replacement of collective stick sockets is necessary for maintenance.
• Old part numbers can be verified by inspecting the socket.
• Follow the F-28/280 A/C/F/FX Series Maintenance Manual for all maintenance.
• Use caution when handling the spring capsule due to high force.
• Mark all fittings and spacers for proper reassembly.
• Torque specifications must be followed to avoid binding.
• Check for binding or stiffness after reassembly.