DA20-C1 Flight Manual
Weight and Balance
Doc # DA202-C1 April 06, 2010 Page 6 - 3
6.2. AIRPLANE WEIGHING
Pre-weighing conditions:
- equipment must be in accordance with the airplane equipment list
- brake fluid, lubricant (6 US qt / 5.7 liters) and
- unusable fuel, included (2 liters unusable, 3.18 lbs/1.44 Kg)
To determine the empty weight and the empty weight CG position, the airplane must be
positioned in the above mentioned pre-weighing condition, with the nose gear and each main
gear on a scale. Ensure that the aircraft is level longitudinally and laterally as illustrated in
Figures 6.1 and 6.2.
With the airplane correctly positioned, a plumb line is dropped from the leading edge of each
wing at the root rib to the floor; join these two points to determine the reference datum (RD).
From this line use a suspended plumb line aligned with each landing axle gear to measure the
distances X (nose gear), X
2LH
(left main gear) and X
2RH
(right main gear).
The following formulas apply:
Finding Empty - Center of Gravity (XCG)
Empty Weight: G = G
1
+ G
2LH
+ G
2RH
lbs [kg]
Empty Weight CG Formula:
(G
1
x X
1
)+(G
2LH
x X
2LH
)+(G
2RH
x X
2RH
)
X
CG
=
G
1
+ G
2LH
+ G
2RH
Finding Empty - Weight Moment
Empty-weight Moment M = Empty Weight (G) x Empty-weight CG (X
CG
)
CAUTION
ITEMS FORWARD OF THE REFERENCE DATUM ARE
CONSIDERED TO HAVE A NEGATIVE LEVER ARM.
ITEMS AFT OF THE REFERENCE DATUM ARE CONSIDERED
TO HAVE A POSITIVE LEVER ARM.
Record the data in the Weighing Report included at the back of this manual. Figure 6.3, Sample
Weighing Report is for reference only.
Revision 25 DOT Approved
To Next Page
Loading...
