Document ID: chunk:federal_register_of_legislation:F2006L03877:body:0:p1
Version: federal_register_of_legislation:F2006L03877
Segment Type: other
Provision Reference: 
Character Range: 0–3098

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 39.001(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.

Airtractor 600 Series Aeroplanes
AD/AT 600/5  Wing Main Spar Lower Cap Fastener Hole  1/2007

Applicability:  Model AT-602 aircraft, serial numbers 602-0337 and subsequent.
Requirement:       1. Unless already accomplished, before accomplishment of the initial eddy current inspection, gain access for the inspection by cutting inspection holes, modify the vent tube, and install cover plates, in accordance with Snow Engineering Co. Service Letter No. 204 Revised 26 March 2001, and Drawing titled "602 Spar Inspection Holes and Vent Tube Mod.," dated 13 November 2003.

                   2. Eddy current inspect the wing centre splice joint outboard two fastener holes in both the left and right wing main spar lower spar caps for cracks, in accordance with Snow Engineering Co. Process Specification 197 Revised 4 June 2002.  For the following aircraft, use the wing spar lower cap hours time in service in the compliance section and accomplish the initial and repetitive inspections:

                     a. For aircraft with serial numbers 602-0337 through 602-0584, as manufactured, inspect at the times specified in the compliance section.

                     b. For aircraft with serial numbers 602-0337 through 602-0584, modified with cold-worked fastener holes in accordance with Snow Engineering Co. Service Letter (SL) No. 244 dated 25 April 2005; if performing the cold working procedure in SL No. 244, it includes the eddy current inspection.

                   Accomplish an eddy current inspection as part of the cold working procedure in SL No. 244 even if the wing spar was previously inspected.

                   3. For aircraft with serial numbers 602-0337 through 602-0584, terminating action for the inspection requirements may be achieved by modification of the wing with installation of part number 20996-2 steel web plate and part number
                   20985-1/2 8-bolt splice blocks in accordance with Snow Engineering Co. Drawing 20998 Revision B, dated 28 September 2004, and cold work of the lower spar cap two outboard fastener holes at the wing centre section splice connection in accordance with Snow Engineering Co. Service Letter No. 240 dated 30 September 2004.

                   4. For aircraft with serial numbers 602-0337 through 602-0584, repair or replace a cracked spar cap found during any inspection, by accomplishing one of the following:

                  a.