1AD/AT/23 Amdt 1 - Aft Fuselage Structure Upper Longeron and Upper Diagonal Tube

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AIRWORTHINESS DIRECTIVE

On the effective date specified below, and for the reasons set out in the background section, the CASA delegate whose signature appears below revokes Airworthiness Directive (AD) AD/AT/23 and issues the following AD under subregulation 39.1 (1) of CASR 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.

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Airtractor AT-300, 400 and 500 Series Aeroplanes

AD/AT/23

Amdt 1

Aft Fuselage Structure Upper Longeron and Upper Diagonal Tube

10/2004

Applicability: Model AT-401, AT-401B, AT-402, AT-402A, and AT-402B aircraft, serial numbers 0716 through 1144.

Model AT-501, AT-502, AT-502A, AT-502B, and AT-503A aircraft, serial numbers 0037 through 0658.

Requirement: 1. For Models AT-401 and AT-401B aircraft, serial numbers 0716 through 1144:

Inspect the upper longeron and upper diagonal tube on the left hand side of the fuselage frame, just forward of the vertical fin front spar attachment, for cracks in accordance with Snow Engineering Co. Service Letter (SL) No. 218A, dated 10 November 2003, as specified in SL No. 195, re-issued 10 November 2003.

2. For Models AT-402, AT-402A, and AT-402B aircraft, serial numbers 0716 through 1144:

Inspect the upper longeron and upper diagonal tube on the left hand side of the fuselage frame, just forward of the vertical fin front spar attachment, for cracks in accordance with SL No. 218A, dated 10 November 2003, as specified in SL No. 195, re-issued 10 November 2003.

3. For Models AT-501, AT-502, AT-502B, and AT-503A aircraft, serial numbers 0037 through 0658:

Inspect the upper longeron on the left hand side of the fuselage frame, just forward of the vertical fin front spar attachment, for cracks in accordance with SL No. 195B, dated 10 November 2003, as specified in SL No. 195, re-issued 10 November 2003.

4. For Models AT-502A aircraft, serial numbers 0037 through 0658.

Inspect the upper longeron on the left hand side of the fuselage frame, just forward of the vertical fin front spar attachment, for cracks in accordance with SL No. 195B, dated 10 November 2003, as specified in SL No. 195, re-issued 10 November 2003.