1AD/AC-CLA/6 - Wing Struts Carry-Through Tube

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

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Aircraft Parts and Development (CALL AIR) A-9 Series Aeroplanes

AD/AC-CLA/6 Wing Struts Carry-Through Tube 3/79

Applicability: All models A-9, A-9A and A-9B with wing struts carry through tube running through hopper.

Requirement: To prevent failure of the main carry-through tube perform the following:

Remove the hopper top and inspect for a fibreglass wrapped carry-through tube. The main carry through tube if located in the hopper is located 625 mm aft of the hopper forward bulkhead and 150 mm below hopper surface. Visually inspect fibreglass wrapping for cracks.

2. If wrapping is cracked, remove wrapping and inspect main carry-through tube for corrosion.

3. Remove all corrosion on tube; if corrosion exceeds depth of 0.25 mm in one location or 2 per cent of the tube cross-sectional area, the main carry-through must be replaced. Nominal cross-sectional area of 262.5 sq. mm. Finish the tube with two coats of zinc chromate primer after corrosion removal. Rewrap the exposed tube with a fibreglass laminate using a minimum of 3 layers of MIL-C-9084 glass cloth or equivalent and chemical resistant resin such as Reichbold 33-402.

Note: Local equivalents may be substituted for glass cloth and resin.

Compliance: Unless already accomplished, within 25 hours’ time in service after 12 December 1978 and thereafter at every major inspection.