Archives: Service Letter

All Service Letter

Interim Revision – Handbook of Maintenance Instructions (HMI) Re: Special Torque Data – Forward Nut, Lower Pulley Drive Shaft

Interim Revision – Handbook of Maintenance Instructions (HMI) Re: Overhaul Cycle, Tail Rotor Drive Transmission Assembly

Interim Revision – Handbook of Maintenance Instruction (HMI) Re: 1200 Hour Periodic Inspection of Main Rotor Gear Drive Assembly

Rebate Time Allowance – Lower Coupling Drive Shaft Assembly PN 5504-5

Replacement of Thermostatic Oil Cooler By Pass Valves, Per AVCO, Lycoming Division, Service Bulletin No. 304A (Red Bordered Mandatory) (dated), 24 June 66

Bendix Fuel Injection System, RSA Series Trouble Shooting Technique for Identifying Fuel to Air Seal Leak

Belt Drive Clutch Engagement Spring PN 5476 -Availability and Utilization

Illumination Intensity – Engine Instrument

Lycoming Service Letter No . L157A (dated), 9 Dec 66; Engine Mounted Full-flow Oil Filter

Input Spline Coupling PN 269A5607 Time Increase – Tail Rotor Transmission