Division Consolidated Aeronautics, Colonial and L - AD/LA-4/23 Amdt 1 - Wing Fitting Carry Through Structure - Consolidated Aeronautics, Colonial and LA-4 Series Aeroplanes

Consolidated Aeronautics, Colonial and LA-4 Series Aeroplanes

AD/LA-4/23 Amdt 1	Wing Fitting Carry Through Structure	10/2005

Applicability:	All models.
Requirement:	Perform the modification, inspection and corrosion treatment of the wing carry through structure in accordance with the instructions contained in Aerofab Service Advisory No. A-001 Dated 4 May 1991 or later revision approved by the Type Certificate holder.Note: The previous amendment of this AD required the wings to be removed to perform a corrosion inspection. This amendment does not require wing removal as the required inspection is now performed using a borescope inserted through a small hole in the wing carry through structure.
Compliance:	Initial modification and first inspection:For aircraft inspected in the last 3 years to the original issue of this AD or previously inspected in accordance with an exclusion allowing the inspection to be carried out in accordance with Aerofab Service Advisory No A-001, accomplish the inspection and treatment no later than 3 years since the last inspection.For aircraft recently imported and not inspected previously to the original issue of this AD or inspected in accordance with an exclusion allowing the use of Aerofab Service Advisory No A-001, perform the initial modification and inspection within 3 months from the effective date of this AD.Subsequent repeat inspections:Repeat inspections every 3 years for aircraft subject to predominantly salt water activity.Predominantly salt water activity is defined as landings and takeoffs being made in salt water as the primary surface, involving more than weekly landings/takeoffs in salt water (i.e. 4 or more per month) or mooring the aircraft for extended periods of time in salt water for greater than 60 days per year.

Applicability:

All models.

Requirement:

Perform the modification, inspection and corrosion treatment of the wing carry through structure in accordance with the instructions contained in Aerofab Service Advisory No. A-001 Dated 4 May 1991 or later revision approved by the Type Certificate holder.Note: The previous amendment of this AD required the wings to be removed to perform a corrosion inspection. This amendment does not require wing removal as the required inspection is now performed using a borescope inserted through a small hole in the wing carry through structure.

Compliance:

Initial modification and first inspection:For aircraft inspected in the last 3 years to the original issue of this AD or previously inspected in accordance with an exclusion allowing the inspection to be carried out in accordance with Aerofab Service Advisory No A-001, accomplish the inspection and treatment no later than 3 years since the last inspection.For aircraft recently imported and not inspected previously to the original issue of this AD or inspected in accordance with an exclusion allowing the use of Aerofab Service Advisory No A-001, perform the initial modification and inspection within 3 months from the effective date of this AD.Subsequent repeat inspections:Repeat inspections every 3 years for aircraft subject to predominantly salt water activity*.*Predominantly salt water activity is defined as landings and takeoffs being made in salt water as the primary surface, involving more than weekly landings/takeoffs in salt water (i.e. 4 or more per month) or mooring the aircraft for extended periods of time in salt water for greater than 60 days per year.

	Or, repeat inspections every 6 years for aircraft subject to predominantly fresh water operations.Predominantly fresh water operations are operations where salt water is encountered infrequently i.e. less than weekly landings/takeoffs in salt water (i.e. less than 4 times a month) or mooring the aircraft in salt water for less than 60 days per year.
	This Amendment becomes effective on 29 September 2005.

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