AD/PT6A/14 - Sungear Coupling Shaft Retaining Rings - CANCELLED

This document officially scraps an old aviation safety rule. What it is: An Airworthiness Directive (AD) is a mandatory safety instruction issued by the Civil Aviation Safety Authority (CASA). This document cancels AD/PT6A/14, which previously required special inspections of sungear coupling shaft retaining rings (engine components) on Pratt & Whitney Canada PT6A turbine engines. What changed: Before this cancellation, mechanics had to follow specific manufacturer service bulletins (UACL SB No. 249 or SB No. 1173) when reinstalling certain reconditioned engine parts. Who it affects: Aircraft operators and maintenance crews working on PT6A engines. Why it matters: As of 2 July 2009, those specific checks are no longer legally required before installing these parts, reducing red tape because CASA determined the safety rule was no longer necessary.