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authors accept that this is technically incorrect but have used the expression for
simplicity and convenience.
AIRCRAFT
Weighing and Levelling
DA 40 Series
AMM
Page 2
20 Sep 2007 08-00-00 Doc # 6.02.01
Rev. 5
Intentionally left blank
AIRCRAFT
DA 40 Series
AMM
Weighing and Levelling
Doc # 6.02.01
Rev. 5 08-10-00 Page 1
20 Sep 2007
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 stubwing
leading edge at the wing joint on each side.
% If MÄM-40-103 is carried out, the fin may house heavy metal to balance the airplane to the correct CG.
AIRCRAFT
Weighing and Levelling
DA 40 Series
AMM
Page 2
20 Sep 2007 08-10-00 Doc # 6.02.01
Rev. 5
Spirit Level
Horizontal Part of
Baggage Compartment Frame
600 mm (23.62 in.)
31 mm
(1.22 in.)
2910 mm
Sprit Level
Wedge
(114.57 in.)
Figure 1: Level the Airplane Laterally for Weighing
Figure 2: Level the Airplane Longitudinally for Weighing
AIRCRAFT
DA 40 Series
AMM
Weighing and Levelling
Doc # 6.02.01
Rev. 5 08-10-00 Page 3
20 Sep 2007
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.
AIRCRAFT
Weighing and Levelling
DA 40 Series
AMM
Page 4
20 Sep 2007 08-10-00 Doc # 6.02.01
Rev. 5
X 2394 mm 1
X 7312 mm 2
Arm - Empty Weight XCG
G1
G2
Reference Plane
2194 mm
(86.38 in)
(94.25 in)
(287.87 in)
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
AIRCRAFT
DA 40 Series
AMM
Weighing and Levelling
Doc # 6.02.01
Rev. 5 08-10-00 Page 5
20 Sep 2007
B. Weighing Procedure with Electronic Weighing Units at the Jacking Points
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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