AD/PA-25/25 - Fuel Cell Vent - Modification - CANCELLED

What this does: This document officially cancels a previous safety rule (Airworthiness Directive) that required owners of Piper PA-25 Pawnee aircraft to modify the fuel tank vents.

Who it affects: Owners and operators of Piper PA-25 Pawnee series aeroplanes.

What the old rule required: The previous directive (issued in 1968) required modifications to the vents in rubber-lined fuel cells following a specific service bulletin from the manufacturer (Piper SB No. 247). Aircraft had to comply within 100 hours of flying time after January 1968.

Why it matters: The fuel vent modification is no longer considered necessary for airworthiness (aircraft safety), so this cancellation removes an obsolete maintenance requirement. Aircraft owners no longer need to track or comply with this specific directive.