OPERATION AND INSTALLATION MANUAL
EN-1320
(3)
BETA-range microswitch adjustment
(for governors LUN7815.02, LUN7815.03)
a) Energize BETA-range circuit in the aircraft cockpit.
NOTE: During adjustment ask another person for assistance in the aircraft cockpit.
b) Adjust the setting screw 38 on the lever contacting the microswitch such way, that the microswitch
switches on when the pin is 0,8 mm (0.0315 inch) above the cam base 27 (figure 12-20). This
adjustment ensures correct microswitch switching at right pin position.
CAUTION:
WHEN THE JOURNAL IS SLIDING ON THE CAM PEAK , CHECK LIGHTLY WITH FINGER,
WHETHER IT IS STILL POSSIBLE TO PUSH THE LEVER WITH THE ELEMENT 38 IN THE
DIRECTION OF THE ARROW THE PUSH-BUTTON OF THE MICROSWITCH “V” TOWARD THE
MECHANICAL STOP. OTHERWISE THE DAMAGE OF THE MICROSWITCH COULD HAPPEN. LOCK
THE ELEMENT 38 WITH NUT.
Figure 12-20 BETA-range microswitch adjustment
A - circuit closed , B - circuit open
NOTE:
Switching on/off of the electric circuit by the microswitch "V" should be tested either by the lever "Zv" after
removing the carrier of the slide blocks or with help of two mechanics, by manual adjustment of the
propeller blades. Set the propeller control lever in the cockpit to position "feather" , carbon block assembly
on the lever "Zv" is connected.
CAUTION: HOLD BLADES NEAR BLADE SHANK, NEVER AT BLADE TIP!
c) Make sure, that during the reverse motion to the initial position after breaking the electric circuit,
the top of the journal is spaced from the base position minimum 0,1 mm (0.004 inch).
If this clearance is less, adjust it by adjusting element – figure 12-20 – and this screw is then locked by
tightening the nut.
d) Adjust when the electric circuit is energized based on the beta-ring position using following procedure:
1 Set the cockpit propeller condition lever into feather position, protrude beta-ring - by turning
propeller blades by hand - to position 9,5
–0,1
mm (0.37-0.374 inch), and fix this position using the
appropriate means.
2 Loosen (not remove) the cam securing screw and adjust the cam 27 to switch-on point of the beta
lamp in the cockpit. Retighten the securing screw after the cam is adjusted. Refer to figure 12-20.
61-10-20
PROPELLER CONTROL SYSTEM
(Installation With Jihostroj LUN-Series Governor)
Page 12-18
2017-10-06
