68-21-01 GLASFLUGEL: Amendment 39-666. Applies to Glasflugel H-301 "Libelle" Gliders, Serial Numbers 1 through 85.
Compliance required within the next 25 hours' time in service after the effective date of this AD, unless already accomplished.
To prevent the improper installation of the horizontal stabilizer to the glider, install locking guide fitting P/N 301-33-8, either on the left or right side of the main elevator fitting in accordance with Glasflugel Modification Leaflet No. 25, dated August 13, 1968, or later LBA- approved issue or an FAA approved equivalent.
This amendment becomes effective October 23, 1968.