AD/CESSNA 400/18 - Crew Door - Modification - CANCELLED

What this does: This document officially cancels an outdated aircraft safety rule.

Who it affects: Owners and operators of Cessna 400 series aeroplanes (though the practical effect is minimal since compliance was completed decades ago).

The details: Back in 1970, a safety directive required modifications to crew doors on these planes to ensure they closed and locked properly. All affected aircraft had to comply within 25 hours of flying time after June 1970.

Why it matters: Because that deadline passed nearly 40 years ago, every affected aircraft has long since been modified. The rule is now obsolete, so this document officially removes it from the books. No further action is required by aircraft owners.