Summary
This document proposes to supersede Airworthiness Directive (AD) 98-09-09, which currently requires replacing the internal cooling air fan with a fan that incorporates a white impeller on all Alexander Schleicher Segelflugzeugbau (Alexander Schleicher) Model ASH 26E sailplanes. The proposed AD would require inspecting the internal cooling air fan for damage, and replacing any fan that does not incorporate a black impeller with a fan that incorporates a black impeller either immediately or at a certain time period, depending on the results of the inspection. The proposed AD is the result of mandatory continuing airworthiness information (MCAI) issued by the airworthiness authority for Germany. The actions specified by the proposed AD are intended to prevent failure of the internal cooling system air fan caused by a certain design configuration of the impeller, which could cause the engine to overheat with possible engine failure.