AD/M20/18 - Nose Gear Steering Horn Assembly Steering Shaft - Replacement - CANCELLED

What this does: This document officially cancels a previous aircraft safety rule (Airworthiness Directive AD/M20/18) that applied to Mooney M20 series aeroplanes.

The original rule: Issued in 1972, it required aircraft owners to replace or modify the nose gear steering horn assembly (the component that connects the steering controls to the front wheel) within 100 hours of flying time after October 1972.

Why it matters: Because all affected aircraft would have complied with this requirement decades ago, the Civil Aviation Safety Authority (CASA) has removed the rule to reduce unnecessary paperwork. If you own a Mooney M20 aircraft, you no longer need to track compliance with this specific directive—though mechanics would have performed the modification back in the 1970s.

Key takeaway: This is a housekeeping measure that cleans up old safety requirements that are no longer relevant.