FES Flight Manual, v1.18 May 2020
Page 17 of 35
4.2.3 Installing the batteries
Warning:
Make sure both battery packs are fully charged before installation
into the sailplane. Both battery packs must have approximately the same
voltage level of cells – ca. 4.16 V per cell. There should be less than 1V
difference, between the total voltage level of individual battery packs!
1. Check batteries for visual damage
Warning:
Even small, visually detectable damage implies that the affected
battery is not airworthy.
2. Open the battery compartment cover.
3. Check: Power switch (key) OFF
4. Check: Sailplane main switch (fuse) OFF
5. Insert the first pack with terminals facing forward and slide it back to the rear of the
compartment.
6. Insert the second pack with terminals facing rearward.
7. Place a pair of fixation plates in the middle of the rear pack, above the carrying strap
and tighten the fixation knob.
8. Secure the forward battery in the same way as described in step 7.
9. Lift power cables from the side support
10. Plug the shorter cable with an 8mm in the BLUE (or BLACK) housing into the 8mm
socket of front battery pack marked with a minus sign.
11. Plug the longer cable with a 10mm pin in RED housing into the 10mm socket of the
rear battery pack marked with a plus sign.
12. Connect DATA cables to DATA ports on both battery packs.
Caution: Before inserting the DATA cable connector, make sure the
orientation is correct. Align the connector straight with the port before
inserting it; otherwise, pins could be damaged.
13. Close battery compartment cover.
4.3 Daily inspection
Keep in mind the importance of inspections after rigging the glider, and before the
first take-off of the day. As a minimum check the following items. If any problems are
found, they must be corrected before the flight.
• Check the sailplane according to its Flight Manual.
• Check the FES system visually, especially the condition of propeller blades.
• Check fire warning LED by pressing the test button. It must light up brightly,
blinking about one time per second. Change the 9V battery if necessary.
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