EASA Airworthiness Directive AD2016-0192 – Schleicher ASK-21

Schleicher has issued ASK 21 Technical Note (TN) 38 following a reported temporary rudder control blockage on an ASK-21 equipped with a rudder hand control system which, on investigation, revealed significant cable slack in the control system. The TN provides instructions to amend the ASK 21 Aircraft Flight Manual (AFM), incorporating updated pre-flight inspection instructions to check the rudder control system of sailplanes modified in accordance with the instructions of Schleicher ASK 21 TN 25 (rudder actuated by hand lever for the front pilot seat) or TN 30 (rudder control by hand for the rear pilot seat).

EASA has now issued Airworthiness Directive AD 2016-0192 requiring that, for sailplanes modified in accordance with Schleicher ASK 21 TN 25 or TN 30, the applicable AFM is amended in accordance with the instructions of Schleicher ASK 21 TN 38 within 60 days of the effective date of the AD and, thereafter, the sailplane is operated accordingly.