It was found that the accomplishment instructions provided to check the
powered sailplane’s propeller hub and blades were not sufficient to detect
cracks and/or other damage. The results of a subsequent manual review
revealed that some other operating instructions provided by the sailplane flight
and maintenance manual were neither correct nor sufficient.
This condition, if not corrected, could lead to operation of the powered sailplane
outside its certified limits.
To address this unsafe condition, EASA issued AD 2013-0012 to require
amendment of sailplane flight- and maintenance manuals to correct the
operating instruction deficiencies and inaccuracies and, for Arcus T sailplanes
that had been repaired before the applicable maintenance manual update, an
elevator or wing flap hinge moment weight check, as applicable.
Since that AD was published, Schempp-Hirth Flugzeugbau GmbH determined
that Action 3 of the accomplishment instructions of Technical Note (Technische
Mitteilung) (TN) 890-13, referenced for Duo Discus T sailplanes, was incorrect
for S/N 1 through 174. To correct this erroneous maintenance instruction,
Schempp-Hirth Flugzeugbau GmbH issued TN 890-13 issue 2.
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