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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
AIRCRAFT
DA 40 Series
AMM
Weighing and Levelling
Doc # 6.02.01
Rev. 5 08-10-00 Page 9
20 Sep 2007
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.
AIRCRAFT
Weighing and Levelling
DA 40 Series
AMM
Page 10
20 Sep 2007 08-10-00 Doc # 6.02.01
Rev. 5
B. Weighing Procedure with Mechanical Scales Under the Wheels
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.
(8) Move the airplane a small distance backwards
and forwards on the flat top of the ramps.
To allow the landing gear legs to spread.
(9) Put a wooden block approximately 52 mm (2 in)
thick on the scale in front of each main wheel.
The blocks should be of the same
thickness.
CAUTION: DO NOT ALLOW THE AIRPLANE TO RUN OFF THE SCALES. THIS
WILL CAUSE DAMAGE TO THE WHEEL FAIRINGS.
(10) Push the airplane forward onto the scales. Make sure that the wheels are above
the center of the scales.
(11) Make the airplane level laterally:
S Put a spirit level on the horizontal surface of
the baggage compartment frame.
S If necessary, use additional thin blocks
between the scale and the main wheel on the
low side to bring the sprit level horizontal.
Refer to Figure 1.
Behind the back seats.
Push the airplane on and off the scales
as necessary.
Make sure that you do not touch the
airplane when you read the spirit level.
AIRCRAFT
DA 40 Series
AMM
Weighing and Levelling
Detail Steps/Work Items Key Items/References
Doc # 6.02.01
Rev. 5 08-10-00 Page 11
20 Sep 2007
(12) Make the airplane level longitudinally:
S Place a wedge on the rear fuselage with the
thin end forward.
S Place a spirit level on the wedge.
S Put thin blocks between the nose wheel and
the scale to bring the spirit level horizontal.
S Or, if necessary, reduce the air pressure in
the nose wheel tire to bring the spirit level
horizontal.
Refer to Figure 2.
(13) Remove the levelling equipment from the
airplane.
(14) Put the rear passenger seats in the upright
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