Applicability: Sailplane L13, all models and serial numbers, certificated in any category. Powered sailplane L13-Vivat, all models and serial numbers, certificated in any category.

Reason: Colour marking of elevator drive is not inspected or re-painted during sailplane operation. The elevator drive is asymmetrical and improper installation causes significant elevator deflection changes.

Effective date: January 28, 1999

Compliance : Action must be done after AD receipt, not later than May 31, 1998 and either in accordance with LET, a.s., Mandatory Bulletin No. L13/082a dated November 27, 1998 which becomes herewith part of this AD and may be obtained from: LET, a.s., 686 04 Kunovice, CZECH REPUBLIC or in accordance with AEROTECHNIK CZ s.r.o. Mandatory Bulletin No. SW 13-045a, SEH 13-003a, SL 13-002a dated December 4, 1998, which becomes herewith part of this AD and may be obtained from: AEROTECHNIK CZ s.r.o., 686 04 Kunovice, CZECH REPUBLIC