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6.4.3 CALCULATION OF LOADING CONDITION NOTE
If the optional de-icing system (O.M 42-053 or O.M 42-054) is installed, the following must be observed: The consumption of fuel causes a forward movement of the CG. The consumption of de-icing fluid causes a rearward movement of the CG. Depending on the fuel flow and de-icing fluid flow, the overall movement of the CG can be a forward or a rearward movement. In order to cover all possible cases, the following table must be completed twice: with (as shown in the example) and without considering the on-board de-icing fluid. All four CG positions (fuel tank full/empty, de-icing fluid tank full/empty) must fall into the permitted area.
1.
Complete the form on the next page.
2.
Divide the total moments from rows 8 and 11 by the related total mass to obtain the CG positions.
In our example: empty tanks: 3625.1 kgm / 1527.5 kg = 2.373 m
314,656 in.lb / 3368 lb = 93.43 in
full tanks: 4312.1 kgm / 1770.5 kg = 2.436 m
374,295 in.lb / 3904 lb = 95.87 in
3. Locate the values in the diagram in Section 6.4.4 'PERMISSIBLE CENTER OF GRAVITY RANGE'. If the CG positions and related masses fall into the permitted area, the loading condition is allowable.
Our example shows allowable loading conditions (for 1785 kg take-off mass, i.e., M.M 42-088 carried out).
CALCULATION OF DA 42 (Example) Your DA 42
LOADING CONDITION Mass [kg] [lb] Moment [kgm] [in.lb] Mass [kg] [lb] Moment [kgm] [in.lb]
1. Empty mass (from Mass and Balance Report) 1250 2756 2937.5 254,965
2. Front seats Lever arm: 2.30 m (90.6 in) 160 353 368.0 31,982
3. Rear seats Lever arm: 3.25 m (128.0 in) 70 154 227.5 19,712
4. Nose baggage compt. Lever arm: 0.60 m (23.6 in) 5 11 3.0 260
5. Cabin baggage compt. Lever arm: 3.89 m (153.1 in) 10 22 38.9 3,368
6. Baggage extension Lever arm: 4.54 m (178.7 in) 5 11 22.7 1,966
7. De-Icing fluid (if installed; see NOTE on previous page) (1.1 kg/liter) (9.2 lb/US gal) Lever arm: 1.00 m (39.4 in) 27.5 61 27.5 2,403
8. Total mass & total moment with empty fuel tanks (Total of 1. through 7.) 1527.5 3368 3625.1 314,656
9. Usable fuel, main tanks (0.84 kg/liter) (7.01 lb/US gal) Lever arm: 2.63 m (103.5 in) 159 351 418.2 36,329
10. Usable fuel, auxiliary tanks (ifinstalled; O.M 42-056) (0.84 kg/liter) (7.01 lb/US gal) Lever arm: 3.20 m (126.0 in) 84 185 268.8 23,310
11. Total mass & total moment with fuel & de-icing fluid (Total of 8. through 10.) 1770.5 3904 4312.1 374,295
Doc. No. 7.01.05-E Rev. 5 15-Nov-2007 Page 6 - 11
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