COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY

SCHEDULE OF AIRWORTHINESS DIRECTIVES

Aerostar (Piper/Ted Smith) 600 and 700 Series Aeroplanes

AD/TSA-600/42

Amdt 1

Applicability: All Models.

Rear Spar Corrosion 3/94

Requirement: 1. Inspect the upper skin of the L/H and R/H mainplanes in the area above the rear spars for evidence of bulging, paying particular attention to the area between the mainplane root end and the nacelle. Evidence of bulging could indicate severe corrosion of the spar, and will necessitate further investigation.

2. Report findings of any bulging or subsequent rectification to a CAA District Airworthiness Office for forwarding to the Manager, Structures Section Canberra, or direct by fax no. 06 268 4594.

Compliance: Prior to 31 July 1993, and thereafter at intervals not to exceed two calendar years.

The compliance time of the initial issue of this Directive remains unchanged, with the repetitive inspection requirement introduced by this issue.

This Amendment is effective from 3 March 1994.

Background: A local report was received by the Authority of severe corrosion of the rear spar caps.

Amendment 1 is issued to introduce a calendar time repetitive inspection, in consideration that the design of the spar assembly would allow the existence of a considerable amount of corrosion before any bulging of the skin was evident.