AD/PA-25/39 Amdt 1 - Fuel Tank - CANCELLED

What this does: This document officially cancels a previous aviation safety rule (Airworthiness Directive) that applied to specific agricultural aircraft.

Who it affects: Owners and operators of Piper PA-25 Pawnee series aeroplanes that were originally equipped with fibreglass fuel tanks.

What changed: The cancelled rule previously required these aircraft to have rubber fuel cell liners installed (following Piper Service Bulletin No. 878) by October 1988 to prevent fuel leaks. That requirement is now abolished because it is no longer necessary—likely because the affected aircraft have either been modified, retired, or the safety risk has otherwise been resolved.

Why it matters: If you own one of these planes, you no longer need to comply with this specific fuel tank modification requirement, though other airworthiness rules still apply.