Airworthiness directives › 2017-02-11
AD 2017-02-11 Airworthiness Directives; Alexander Schleicher GmbH & Co. Gliders
Applicability*9
This AD applies to Alexander Schleicher GmbH & Co. ASK 21 gliders, all serial numbers, certificated in any category, that are modified with a rudder hand control system using either ASK 21 Technical Note No. 25, dated February 16, 1993, or ASK 21 Technical Note No. 30, dated January 22, 2007.
Compliance
Unless already done, do the actions in paragraphs (f)(1) through (4) of this AD: (1) If the glider is equipped with a rudder actuated by means of a hand lever at the left cockpit wall in the front pilot seat by ASK 21 Technical Note (TN) No. 25, dated February 16, 1993, within the next 60 days after March 17, 2017 (the effective date of this AD), replace the flight manual (FM) and maintenance manual (MM) pages with the following pages in ASK 21 TN No. 38, dated May 31, 2016: (i) FM: Check List/1, 16a, 19.1a., and 21. (ii) MM: 13, 15. (2) If the glider is equipped with a rudder actuated by means of a hand lever at the left cockpit wall in the rear pilot seat by ASK 21 TN No. 30, dated January 22, 2007, within the next 60 days after March 17, 2017 (the effective date of this AD), replace the FM and MM pages with the following pages in ASK 21 TN No. 38, dated May 31, 2016: (i) FM: Check List/1, 16a, 18a, 19b, 19c, 19.1a, and 21. (ii) MM: 13, 15. (3) For all affected gliders, within the next 60 days after March 17, 2017 (the effective date of this AD) and repetitively thereafter at intervals not to exceed every 12 months, inspect the rudder cable tension and make any necessary corrections following the instructions from FM page 19.1a, Checking and Adjusting of the Cable Tension, as specified in ASK 21 TN No. 38, dated May 31, 2016. (4) For all affected gliders, after March 17, 2017 (the effective date of this AD), any glider modified with a rudder hand control system in accordance with ASK 21 TN No. 25 or TN No. 30 must also have the FM and MM amended following the instructions in ASK 21 TN No. 38, dated May 31, 2016.
Required actions
In addition to the provisions of 14 CFR 43.3 and 43.7, the actions required by paragraph (f)(1) through (2) of this AD may be performed by the owner/operator (pilot) holding at least a private pilot certificate and must be entered into the glider records showing compliance with this AD following 14 CFR 43.9 (a)(1) through (4) and 14 CFR 91.417(a)(2)(v). The record must be maintained as required by 14 CFR 91.417, 121.380, or 135.439.
Unsafe condition
This AD was prompted by mandatory continuing airworthiness information (MCAI) originated by an aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI describes the unsafe condition as cable slack in gliders equipped with a rudder hand control system. We are issuing this proposed AD to correct any excess slack in the rudder hand control system, which could result in a short-term blockage of the rudder control system and reduced control.
Affected ADs
None.
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