pdf Gfa ad 280 issue 5 Popular

CRACKING OF THE LOWER RUDDER HINGE / CONTROL YOLK

Applicable to the 401 Kestrel, T59 Kestrel all variants, H301B Libelle, Standard Libelle, Standard Libelle 201B. During December 1984 a Kestrel rudder yoke failed during flight. As a result of the first inspections required by Issue 1 of this AD a Libelle was found to be cracked. Since the Glasflügel designs of various types have similar yokes these should be inspected carefully. The manufacturer improved the design of the yoke for the H 401 Kestrel and the replacement of the yoke became compulsory overseas. A number of factors affect the formation of cracks in this part. Heavy landings or ground loops place significant extra stress on this part. Incorrect rudder system stops and an excessively tight fit of the stem of the yoke where it passes through the rudder create unnecessary extra stress, too. This issue of AD 280 removes the Club Libelle, Hornet variants, Mosquito variants and H 304.  These aircraft are now covered by ADs 584 and 585.  This AD still applies to those aircraft listed above under “types affected”. Technical Note No. 401-19 which herewith becomes part of this AD.