AD/AC/83 Amdt 8 - Corrosion of Wing Lower Spar Cap (Cth)

AIRWORTHINESS DIRECTIVE

For the reasons set out in the background section, the CASA delegate whose signature appears below revokes Airworthiness Directive (AD) AD/AC/83 Amdt 7 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.

Twin Commander (Gulfstream/Rockwell/ Aerocommander 500, 600 and 700) Series Aeroplanes

AD/AC/83 Amdt 8

Corrosion of Wing Lower Spar Cap 11/2003

Applicability: All 500U, 500S, 68OW, 680FL, 680FLP, 681, 685, 690, 690A, 690B aircraft with Serial Numbers after S/No. 1731.

Requirement:

Yes

No

Yes

No

Twin Commander (Gulfstream/Rockwell/ Aerocommander 500, 600 and 700) Series Aeroplanes

AD/AC/83 Amdt 8 (continued)

Note 1: If spar cap replacement is necessary, refer to AD/AC/86 Amdt 1 for details and instructions on spar cap replacement.

Replacement of the spar cap constitutes terminating action for this Directive.

Compliance: As per flowchart in the requirements section.

This Amendment becomes effective on 30 October 2003.

Background: Several aircraft have been found with severe corrosion between the aluminium spar cap and the internal CRS strap. This necessitated spar cap replacement in those aircraft. Subsequent amendments after the initial issue of this Directive developed the inspection procedure and periodicity, and defined applicability.