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4.4.2
Overcentre locking moment and locking travel
Caution: Checks and installation must be done at room temperature
(20 – 25° C). Please make sure that the wings have been warmed up or cooled
down to this temperature. At other temperatures wrong measurement of the
locking moment will occur.
If it was necessary to adjust the locking moments, rig the glider after the
adjustment and check if both airbrakes retract at the same time. Tolerance
is 3 mm (0.12 in.). To measure retract the airbrakes until the first cap is
flush with the wing surface at the outboard end. Hold the airbrake handle in
this position and measure how high the outboard end of the other airbrake
is above the wing surface. If this is out of tolerance you have to reduce the
locking moment at the brake which retracts first or to increase the locking
moment at the brake which retracts last. But check that the locking
moments remain within their tolerances. For this adjustment adjust the rod
end in the airbrake box by 1/2 turn only.
1. Overcentre locking moment
To determine the moment a tool 5V17 and a rod which you must produce
according to drawing 5V18 (enclosed to the MM) are needed. Place the tool
on the airbrake control hook up at the wing root rib.
Unlock: Rotate away from the stop
Lock: Rotate until the transversal pin of the hook-up touches the stop.
Measure the moment to lock the airbrake. The locking moment must be
measured as a force at 200 mm (7.87 in.) from the point of rotation at rod
5V18. The force shall be 60 - 80 N (13.2 - 17.6 lbs.). The sum of the forces
of the left and the-right wing shall not exceed 150 N (33.0 lbs.).
Adjustment of the moment is made by adjusting the rod end at the pushrod
inside the airbrake box.
Turn in the rod end:
Turn out the rod end:
1/2 turn of the rod end changes the force by approx. 14 N (3 lbs.).
Issued: October 2010
Copyright DG Flugzeugbau GmbH - any copy or publishing prohibited
Manual valid with the up-to-date cover page only
Maintenance Manual DG-1000M
reduce the moment
increase the moment
4.4
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