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Lemac

This document contains 9 multiple choice questions regarding calculating center of gravity (CG) positions in percentages of mean aerodynamic chord (%MAC) using data about aircraft dimensions, cargo loads, and mass properties. The questions require applying formulas and looking up information in reference materials to determine CG locations, amounts of cargo that must be moved, and dry operating indexes.

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Keobakile kesebone
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167 views2 pages

Lemac

This document contains 9 multiple choice questions regarding calculating center of gravity (CG) positions in percentages of mean aerodynamic chord (%MAC) using data about aircraft dimensions, cargo loads, and mass properties. The questions require applying formulas and looking up information in reference materials to determine CG locations, amounts of cargo that must be moved, and dry operating indexes.

Uploaded by

Keobakile kesebone
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOCX, PDF, TXT or read online on Scribd
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LEMAC OR % mac

1. Chord Length 1m; C of G 25% MAC; A/C Mass 2200 KGs; Fwd hold - 0.5 m ; Aft hold +2.5 m ; What weight needs to be
moved from the forward hold to the aft hold to achieve 40% MAC?;
a) 183kg
b) 104kg
c) 165kg
d) 110kg

2. At Reference or use CAP 696 figure 4.12 to determine the Dry Operating Index for a DOM of 35,000kg and a %MAC of
14%.
a) 35
b) 45
c) 40
d) 50

3. At a given mass the CG position is at 15% MAC. If the leading edge of MAC is at a position 625.6 inches aft of the datum
and the MAC is given as 134.5 inches determine the position of the CG in relation to the datum.
a) 645.78 inches aft of datum
b) 20.18 inches aft of datum
c) 605.43 inches aft of datum
d) 228.34 inches aft of datum

4. Given the following data how much cargo must be moved from the forward hold to the aft hold to achieve a CG at 33%
MAC?;
AUM 200000kg;
Forward Hold Cargo 6500kg;
Aft hold Cargo 4000kg;
Distance between holds 10m;
Current CG: 30%MAC;
MAC 4.6m;
a) 2760kg
b) 6000kg
c) 1467kg
d) 2904kg

5. The loaded centre of gravity (eg) of an aeroplane is 713 mm aft of datum. The mean aerodynamic chord lies between
station 524 mm aft and 1706 mm aft. The eg expressed as % MAC (mean aerodynamic chord) is:
a) 10%
b) 60%
c) 41 %
d) 16%

6. Given the following data:; Distance from datum to centre of gravity 12.53 m ; Distance from datum to leading edge 9.63
m ; Length of MAC 8.00 m ; Calculate the Centre of Gravity in % MAC (mean aerodynamic chord);

a) 23.1 % MAC
b) 36.3 % MAC
c) 63.4 % MAC
d) 47.0 % MAC

1
LEMAC OR % mac
7. Given the following data calculate the CG as a %MAC when 12000N of last minute cargo is added to a hold 10m from
the datum. AUM 460000N, LEMac 14m from datum, MAC 4.6m, Current CG 15.4m from datum.
a) 30.5%
b) 27.5%
c) 25%
d) 29.25%

8. Given the following data calculate the CG as a %MAC when 12000N of last minute cargo is added to a hold 10m from
the datum. AUM 460000N, LEMac 14m from datum, MAC 4.6m, Current CG 15.4m from datum.
a) 30.5%
b) 27.5%
c) 25%
d) 29.25%

9. At a given mass the CG position is at 15% MAC. If the leading edge of MAC is at a position 625.6 inches aft of the datum
and the MAC is given as 134.5 inches determine the position of the CG in relation to the datum.
a) 20.18 inches aft of datum
b) 605.43 inches aft of datum
c) 228.34 inches aft of datum
d) 645.78 inches aft of datum

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