I have checked my wing according to AI MB No. L13/112a. and I have the exact rivet pattern like in the reinforced wing .They have steel rivets in the middle row and aluminium rivets in the rows beside.And they are spaced apart just a bit more .The splice extends past the but rib also. I compared it with the other L13 I also got last year and they indeed look like in the option 1 in the Ad .Rivets are closer together and all aluminum The reinforced version looks also exactly like in the L23. So I am hopeful I will get that L13 back in the air. The wings got built factory new in 1996 . EASA AD No.: 2011-0135R2. says under Required Action.
(2) After 20 July 2011 [the effective date of this AD at original issue], inspect the sailplane to determine whether the wing structure is in conformity to the L-13 A Blaník design specification, or in conformity to the L-13 Blaník ‘reinforced’ design specification, in accordance with the instructions of AI MB No. L13/112a.
and under (4) If, as a result of the inspection required by paragraph (2) of this AD, conformity is demonstrated, accomplish all the additional actions specified in paragraphs (4.1), (4.2) and (4.3) of this AD. Only after all actions have successfully been accomplished, flights can be resumed.
The remaining actions require just counting the hours for double seatet flying ,winch and aerobatics
from the log book
4.1
Table 1 - Maximum Limits
Type of Operations
aerobatic Flights 100 FH
Winch launches. 25 000 WL
Dual Flights. 2 500 FH
(4.2)
Inspect the areas of wing skin joints (ribs No. 7 and 13 of the wing) for cracks at ribs and stringers in accordance with the instructions of AI MB No L13/108a. In case a failed stringer or rib is detected, accomplish a repair in accordance with the instructions of AI Information Bulletin (IB) No L13/107b.
(4.3)
Amend the Aircraft Flight Manual (AFM) as follows: All aerobatics manoeuvres, e.g. Roll (Výkrut), Loop (přemet), Stalled turn (souvrat), Immelmann turn (překrut), Half roll (zvrat) and Inverted flight (let na zádech) are prohibited. This can be accomplished by inserting a copy of this AD into the AFM and invalidating the following “aerobatics” chapter of the AFM, as applicable: