PIK-20 E Service manual
5. WEIGHT AND BALANCE
5.1 General
The sailplane has been weighed with the equipment marked with "x" in
the Equipment list (see Service Manual 7.1. The results of weighing by
the manufacturer are given in the Weight and Balance Data Sheet
(supplement of Flight Manual). After changing the equipment or fixed
nose or tail ballast the sailplane must be weighed again to get the new
actual weight and moment. These changes can also be taken into ac
count by calculations. The result must be recorded in the flight Manual
6.4. .The equipment list markings must also be updated.
5.2 Weighing procedure
5.2.1 Preparation
— Ensure that all items marked in the sailplane equipment list are instal
led in their proper location in the sailplane.
— Drain the water ballast system and fuel tank.
— Retract the engine.
— Remove dirt, moisture, foreign objects such as rags and tools from
the sailplane before weighing.
— Weigh the sailplane inside a closed building to prevent errors in scale
readings due to wind.
5.2.2 Weighing
— Level the sailplane (see figure 5.1). Levelling means: Slope of top
surface of rear fuselage between stations 4.5 m and 5.5 m 1000 to 28
tail down.
Datum: Vertical plane 2.113 m (83.19 in) forward of the first wing fitting
tube foreward surface.
— When the sailplane is leveled, record the weight shown on each sca
le. Deduct the tare, if any, from each reading.
EIRI KY
y
Kisällinkatu 8
SF-15170 Lahti 17
page 11-32
