MANDATORY BULLETIN

MB No.: L13/082a
Concerning: Gliders L 13, L13A, L13AC Blanik
Reason:  Prevention of the elevator drive inverted adjustment (180
         degrees) during its reinstallation back on the Glider.
To be carried out at the latest by: At the next A-type Periodical
Inspection.
To be carried out by: Operator.
Costs to be covered by: Operator.
Necessary material to be supplied by: Operator.
Bulletin becomes effective: Upon the issue date.
Work to be invested (man-hours): 0.3
Total number of sheets: 4
                             Friedrich
                        ....................
                            Manufacturer
    Engineering data contained In this Bulletin Is CAI Approved.
   Date: December 10, 1998
            LET a.s., Kunovice 688 04, Czech Republic

A.       WORK PROCEDURE
         DISMANTLING
1.       Uncover the tail cover, pos. 1 according to the Fig. 1.
2.       Mark the specified position on the left-hand elevator, pos. 2 as
         well as on the elevator drive for mechanical transfer of motion,
         pos. 3 according to the view X using a red color (synthetic
         paint).
3.       Maintain this mark during whole the operation time.
         Assembling
         Set the tail cover to its original position.
B.       MATERIAL NECESSARY FOR ONE AIRCRAFT MODIFICATION 
         The operator will use his own material.
C.       PICTURE PART
         Fig.  No. 1
D.       NECESSARY DOCUMENTATION 
         No effect.
E.       NECESSARY TOOLS
         No effect.
F.       SPARE PARTS IN OPERATION
         No effect.
G.       AIRCRAFT WEIGHT
         No effect.

L13/082a Sheet 2 of 4

H.    RECORD IN AIRFRAME LOGBOOK AFTER BULLETIN IMPLEMENTATION

         The color marking of the elevator as well as its drive for
         mechanical transfer of motion on the left-hand side has been
         carried out.

         Date:                     Carried out by:
               ...............
         (Legible signature of authorized person)

G.       ACCQMPANYING DOCUMENTATION
         No effect.
 
L13/082a Sheet:         3 of 4