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Reference Plane
Legend:
X1 = Arm, Reference Plane to center line of main wheels.
X2 = Arm, Reference Plane to center line of nose wheel.
G1 = G1LH + G1RH = Net weight, main wheel scales LH and RH.
G2 = Net weight, Nose wheel scale.
G = G1LH + G1RH + G2 = Empty Weight.
XCG = Arm - Empty Weight center-of-gravity (calculated).
Figure 5: Weighing Dimensions for Mechanical Scales Under the Wheels
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Weighing and Levelling
AMM
3. Weighing with Mechanical Scales Under the Wheels
If you use mechanical scales to weigh the airplane, you must also use wooden blocks under the wheels to level the airplane. You must obey the manufacturers' instructions on the scales.
A. Equipment
Items Quantity Part Number
Mechanical scales (The scales used for the main wheels must be the same). 3 Commercial
Spirit level. 1 Commercial
Plumb line. 1 Commercial
Wedge, slope 600:31 (2.96°). 1 Local Manufacture
Wooden blocks (various thicknesses). A/R Local Manufacture
Ramps. 3 Local Manufacture
Optional: Airplane jacks (600 kg / 1320 lb. minimum lifting capacity). 3 Commercial
Note: If you use airplane jacks to lift the airplane onto the ramps, you must move the airplane a small distance back and forward to allow the landing gear to spread. This will prevent side loads on the scales causing errors.
This procedure uses jacks because the main wheel scales need approximately 52 mm (2 in) of blocks to bring the airplane level.
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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AMM
B. Weighing Procedure with Mechanical Scales Under the Wheels
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.
(1) Make a copy of the Weighing Report form. Figure 6.
(2) Put the weighing scales in position on the floor in front of each wheel.
(3) Zero the scales. Refer to the scale manufacturer‘s instructions.
(4) Close the canopy.
(5) Lift the airplane on jacks. Refer to Section 07-10.
(6) Put the flat part of the ramps under each wheel.
(7) Lower the airplane onto the ramps with the jacks. Remove the jacks. Refer to Section 07-10.
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