AD/F27/38 - ADF Sense Antenna - Modification - CANCELLED

What this is: This document officially scraps an old aviation safety rule from 1967 that required modifications to radio equipment on Fokker F27 aircraft.

The backstory: In 1967, the aviation safety regulator ordered owners of Fokker F27 aeroplanes to modify their Automatic Direction Finder (ADF) units (specifically Bendix DFA-70A models) to meet certain performance standards. This equipment helps pilots determine their direction using radio signals.

What changed: The old rule is cancelled effective 22 October 2009.

Why: After 42 years, the regulator assumes every affected aircraft has either been modified or retired, so the rule is no longer needed.

Who cares: Primarily aviation historians and Fokker F27 operators who need to confirm their compliance records are complete. No action is required—this is simply housekeeping to remove obsolete rules from the books.