AD/HU 369/90 - Tail Rotor Blade Abrasion Strip (Cth)

COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES

McDonnell Douglas (Hughes) and Kawasaki 369 Series Helicopters

AD/HU 369/90 Tail Rotor Blade Abrasion Strip 5/95

DM

Applicability: Model 369 series helicopters, with tail rotor blade assembly part numbers listed in McDonnell Douglas Helicopter Systems SIN HN-238, DN-187, EN-80, or FN-66.

Requirement: 1. Inspect the tail rotor blade abrasion strip for debonding from the tail rotor blade. Prior to conducting the inspections, remove any abrasion tape from the tail rotor blade.

If the inspection reveals debonding, replace the tail rotor blade with an airworthy blade that has been modified by installation of rivets, and install 304 stainless steel abrasion tape (.0027 inch thick) over the inboard end of the abrasion strip in accordance with steps B through H of Part I of the Accomplishment Instructions of McDonnell Douglas SIN HN-238, DN-187, EN-80, or FN-66.

If the inspection reveals no debonding, install 304 stainless steel abrasion tape (.0027 inch thick) over the inboard end of the abrasion strip in accordance with steps B through H of Part I of the Accomplishment Instructions of McDonnell Douglas Helicopter Systems SIN HN-238, DN-187, EN-80, or FN-66.

2. Replace the affected tail rotor blades in shipsets with tail rotor blades that contain the new-design abrasion strips in accordance with Part II of the Accomplishment Instructions of SIN HN-238, DN-187, EN-80, or FN-66. Once the new-design abrasion strips are installed on the tail rotor blades, the tail rotor assembly part number changes as follows:

Old Tail Rotor Assembly No New Tail Rotor Assembly No 369A1613-7 369A1613-11 369A1613-503 369A1613-507