DG Flugzeugbau DG-1000T Maintenance Manual page 143

Enclosure 4 for Maintenance Manual DG-1000T
1.6.5.2 Adjustment / limit switches
With the electrically operated landing gear only the limit switches have to be
adjusted
a) Limit switch landing gear extended
1. Extend the landing gear electrically and check if the drag struts 10FW102
and the struts of the rear fork 10FW91 touch each other at their joint hinge
point.
2. Apply a force of 100 N (2 lbs.) to the hinge point perpendicular to the centre
line of the struts in anupward direction. The system should be so stiff that
you can move the hinge point no more than 2 mm (0.08 in.) out of line.
3. If it is possible to move the hinge point more than 2 mm, the limit switch
must be adjusted. To accomplish this you have to bend the arm of the switch
accordingly. The limit switch is mounted on the landing gear box and is
activated by the lever 10FW108.
4. Retract the landing gear a small amount, extend again and check if the lower
green control light starts shining. If not, the arm was bent too faar.
5. If the adjustment is correct, retract the landing gear and extend via the
emergency system. Check if the lower green control light starts shining. If
not, the arm was bent too faar. After adjustment repeat the check according
to item 2.
b) Limit switch landing gear retracted
The spindle drive must be shut off in the retracted position
when the bolt at the left drag strut 10FW102 engages in the
notch of the left latch on shaft 10FW109 and activates the
limit switch which is mounted to the latch.
Check: Activate the limit switch. The distance Y shall be
2 - 3 mm (0.08 – 0.12 in.) when the switch activates.
If necessary adjust the switch by bending its arm.
c) Limit switch gas strut (emergency extension system)
This switch (position 12 in diagram 21) is mounted to the upper end of the
gas-strut at bracket 10FW120. When resetting the gas strut the spindle drive
must be stopped by the limit switch when the distance X in diagram 21
(from counter nut up to gas strut body) is 17 - 20 mm (0.67 – 0.8 in.). If
necessary loosen the mounting screws and rotate the switch for adjustment.
Issued: February 2011 TN1000/18 page of 8
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