Archives: Service bulletins

All Service bulletins

Tailboom Support Struts Corrosion Inspection

Corrosion Inspection and Treatment of Lower Coupling Drive Shaft

Main Rotor Driveshaft Inspection

Periodic Inspection of Main Transmission Pinion Input Shaft Assembly

Inspection and Retirement of 269A2324-7 Tailboom Center Attachment Fitting

Inspection of Clutch Control Spring Assembly Installation

Inspection of Seat Belt Snap Hook End Fittings

Maintenance and Operation Requirements for Safe Operation of Surplus TH-55A Helicopters

One-time X-ray Inspection of Tail Rotor Blade Spar P/N 269A6035-21 and -23

Return of Cluster Fittings in Spares Inventory; Dye Penetrant Inspection and Removal of Sample Piece from Aft Cluster Fittings; Daily Visual Inspection of Aft Cluster Fittings