AD/F27/21 - Aileron Control Wheel - Inspection of Washers - CANCELLED

What this is: This is an Airworthiness Directive (AD) — a mandatory safety rule issued by the Civil Aviation Safety Authority (CASA) for aircraft.

What it does: It formally cancels an old safety requirement that applied to Fokker F27 aeroplanes. The original rule (first issued in 1960 and updated in 1971) required owners to inspect and replace specific washers located below the aileron control wheel retaining nut.

Why it matters: The inspection rule is now obsolete because all affected aircraft would have been inspected and modified decades ago. This document removes the outdated requirement from the safety regulations, effective 22 October 2009.

Who it affects: Owners and operators of Fokker F27 aircraft, though in practice all necessary work was completed long before this cancellation.