AD/TSA-600/42 Amdt 1 - Rear Spar Corrosion - CANCELLED

The bottom line: This document scraps a 16-year-old safety rule that forced owners of Aerostar aircraft to check their rear wing spar for rust every two years.

Who it affects: Owners and operators of Aerostar (Piper/Ted Smith) 600 and 700 series aeroplanes.

What it does: This instrument officially cancels Airworthiness Directive (AD) TSA-600/42. Previously, this rule required periodic inspections for corrosion in the rear spar at intervals not exceeding two years. As of 4 June 2009, that specific inspection obligation no longer applies.

Why it matters: The original requirement was unique to Australia and not based on manufacturer service documents. After 16 years, the Civil Aviation Safety Authority determined these inspections were no longer necessary. This removes a compliance burden and reduces maintenance costs for aircraft owners while maintaining safety through other regulatory means.