JS-MD 3
Aircraft Flight Manual
MD10-AFM-00-001
Issue: 01
Rev. 00
Rev. Date: 14-Feb-20
Page 6-7
To determine if a selected load falls within the CG envelope, as illustrated
in Figure 6.3-3, the following procedure can be used:
1. List all the loads in table format as illustrated in Table 6.3-1
2. (Include the mass and CG arm of the empty aircraft as obtained
in the mass and balance report).
3. Calculate the moments for each load, using the formula:
Moment = Mass x Moment arm
4. Add the mass of the applicable loads
5. Add the moments of the applicable loads
6. Plot the mass against the moment on the JS-3 Envelope diagram
7. The Flying CG can also be calculated using the formula
Flying CG position = (Total of Moments) / (Total Mass)
Example:
Determine if the following loads falls within the allowable envelope:
•
Empty aircraft: 280 kg, CG position 470 mm
•
Pilot with parachute weighs 90 kg
•
Both the main tanks and expendable tail tanks filled to capacity.
•
The non-expendable tail tank filled with 8.9 litres of water
•
An O
2
bottle of 2 kg fitted.
This example is given in metric units only.
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