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Section 08-10
Weighing

1. General
Only operate the airplane within the permitted range of weight and center of gravity limits. This will give good flight performance and good handling qualities. It is also necessary for safety.
If you make any changes to the airplane that will alter the weight (or the center of gravity), then you must calculate the new weight of the airplane. You must also calculate its center of gravity.
Only an approved person can weigh the airplane. The national airworthiness authority of the country where the airplane is registered gives approval for persons to weigh the airplane. It also gives the time limits.
Use the Weighing Report when you do the weight and balance calculations (Refer to Figure 4 or Figure 6).
You can use mechanical scales or electronic weighing units to weigh the airplane. Electronic weighing units give more accurate results. They are also easier to use. You must obey the manufacturers' instructions on the scales or weighing units.
The reference plane for the DA 40 is a transverse, vertical plane in front of the airplane. It is at right angles to the horizontal reference line. The reference plane lies 2194 mm (86.38 in) in front of the stub-wing leading edge at the wing joint on each side.
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Figure 1: Level the Airplane Laterally for Weighing

Figure 2: Level the Airplane Longitudinally for Weighing
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Weighing and Levelling
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2. Weighing with Electronic Weighing Units at the Jacking Points
If you can use electronic weighing units to weigh the airplane, you can use the jacks to make the airplane level. You must obey the manufacturers' instructions on the weighing units.
A. Equipment
Items  Quantity  Part Number 
Airplane jacks (600 kg / 1320 lb minimum lifting capacity).  3  Commercial 
Electronic weighing units.  3  Commercial 
Spirit level.  1  Commercial 
Wedge, slope 600:31.  1  Local Manufacture 

Before you weigh the airplane do these items:
) Make sure the airplane has all its equipment. The equipment must be in the location shown in the Equipment Inventory. The Equipment Inventory is included in Section 6.5 of the Airplane Flight Manual.
) Defuel the airplane to the unusable fuel level. The unusable fuel level is 0.5 US gal (approx. % 1.9 liters) per wing tank (Lycoming version) or 1 US gal (approx. 3.8 liters) per wing tank (TAE % version). Refer to Section 12-10.
) Add engine oil and operating fluids up to the maximum level. Refer to Section 12-10.
) Clean the airplane and dry it.
) Remove all objects which are not part of the Equipment Inventory (for example tools, baggage, etc.). The Equipment Inventory is included in Section 6.5 of the Airplane Flight Manual.
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Legend:
X1 = Arm, Reference Plane to Center Line of Main Jacking Points.
X2 = Arm, Reference Plane to Center Line of Tail Jacking Point.
G1 = G1LH + G1RH = Net Weight, main jacks LH and RH.
G2 = Net Weight, Tail Jack.
G = G1LH + G1RH + G2 = Empty Weight.
XCG = Arm - Empty Weight Center-of-Gravity (calculated).

Figure 3: Weighing Dimensions for Electronic Weighing Units at the Jacking Points
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B. Weighing Procedure with Electronic Weighing Units at the Jacking Points
DA 40 Series

Detail Steps/Work Items  Key Items/References 
Note: Weigh the airplane in a closed room. This will avoid any wind causing weighing errors. 
　
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