AD/LA-4/27 - Wing Spar Doublers and Spar Cap Angles (Cth)

AIRWORTHINESS DIRECTIVE For the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.1 (1) of CAR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.

Consolidated Aeronautics, Colonial and LA-4 Series Aeroplanes

AD/LA-4/27 Wing Spar Doublers and Spar Cap Angles 13/2002 DM

Applicability: Affected aircraft with wing spar part numbers incorporated, as specified below:

Model Serial Numbers Model LA-4 Serial numbers 246 through 421, 423 through 429, 445, and 446. Model LA-4A Serial numbers 244 and 245. Model LA-4P Serial number 121. Model LA-4-200 Serial numbers 422, 430 through 444, 446 and subsequent. Model 250 Serial numbers 1 through 232.

Wing Spar Parts Part Numbers Upper Spar Cap Angles 2-1610-015 and 2-1610-016 Lower Spar Cap Angles 2-1610-075 and 2-1610-076 Upper Spar Doublers 2-1610-061 and 2-1610-081 and 2-1610-065 Lower Spar Doublers 2-1610-063 and 2-1610-083

Requirement: 1. Inspect the wing spar doublers and spar cap angles for cracks from the root end to the outboard of the wing spar attachment fittings, as follows:

1. From inside the wheel well, clean the upper and lower wing spar doublers and adjoining structure to the paint. Use a detergent or mineral-based solvent.