AD Schleicher Hoogteroer flutter

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AD Schleicher Hoogteroer flutter

Bericht door Webmaster » 21 jul 2014, 22:36

ASW 22, ASW 22 B and ASW 22 BL sailplanes, all manufacturer serial
numbers.
Reason: An occurrence of flutter, involving elevator control and horizontal stabilizer, was
reported on a ASW 22 sailplane which had exceeded 7 000 flight hours (FH).
The subsequent investigation determined that an aging phenomenon of
affected control circuit structural elements led to a reduction of control stiffness.
As a result, coupling of the reduced natural frequency of the affected control
circuit with the horizontal stabilizer frequency generated a flutter phenomenon.
This condition, if not detected and corrected, could lead to horizontal stabilizer
and/or elevator flutter, possibly resulting in reduced control of the sailplane.
To address this potential unsafe condition, Schleicher issued Technical Note
(TN) 17 ASW 22 to provide inspection instructions and developed a
modification “Modification to increase the control stiffness of the ASW22
elevator control system”.
For the reasons described above, this AD requires a one-time inspection and
modification of the elevator control system.
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