70-21-03 ENTWICKLUNGSGEMEINSCHAFT: Amendment 39-1088. Applies to Model "PHOEBUS" A1, B1, and C Sailplanes up to and including S.N 934 which have a brake chute installed.
To prevent the rudder from becoming blocked by the back-slipping chute coupling, within the next 100 hours' time in service after the effective date of this AD, unless already accomplished, replace the chute coupling with a modified coupling in accordance with Messerschmitt - Bolkow - Blohm Service Bulletin No. Phoebus-1/70 dated April 1970, or later LBA-approved issue or an FAA-approved equivalent.
This amendment becomes effective November 5, 1970.