76-09-10 SCHEMPP HIRTH and BURKHART GROB: Amendment 39-2602. Applies to Standard Cirrus gliders, certificated in all categories, serial numbers 1 through 510, 528, and 529 for Schempp Hirth gliders and serial numbers 1G through 544G for Burkhart Grob gliders.
Compliance is required within the next 100 flights after the effective date of this AD, unless already accomplished.
To prevent possible jamming of the aileron control system and consequent loss of roll control, accomplish the following:
(a) Install an SAE 1024 steel safety brace in the fuselage frame between the airbrake lever bearing and the left diagonal strut in accordance with Step 2 of the paragraph entitled "Instructions" of Schempp Hirth Technical Note 278-17, dated December 8, 1975, or an FAA- approved equivalent.
(b) For the purpose of this AD, a flight is a sequence consisting of a takeoff operation and landing.
This amendment becomes effective May 20, 1976.