Section 6
Columbia 400 (LC41-550FG)
Weight & Balance
Initial Issue of Manual: November 10, 2004
RC050002
Latest Revision Level/Date: -/11-10-2004
6-13
CALCULATOR METHOD
Sample Problem
Calculator Method
Actual Calculation
For This Airplane
ITEM
WT.
(Lbs.)
ARM
(Inches)
MOMENTS
(lbs.-in.)
ITEM
WT.
(Lbs.)
ARM
(Inches)
MOMENTS
(lbs.-in.)
Basic Empty Wt.**
2,485
260,433 Basic Empty Wt.
Front Seat Wts.
380
110.0
41,800 Front Seats
110.0
Rear Seats Wts.
175
141.4
24,745 Rear Seats
141.4
Baggage (Main)
50
166.6
8,330 Baggage (Main)*
166.6
Baggage (Zone A)
0
155.7
0 Baggage (Zone A)*
155.7
Baggage (Zone B)
0
177.4
0 Baggage (Zone B)*
177.4
Baggage (Shelf)
0
199.8
0 Baggage (Aft)
199.8
Fuel (At 6 lbs./gal.)
360
118.0
42,480 Fuel (At 6 lbs./gal.)
118.0
Totals 3,450
377,788 Totals
*When computing baggage moment, use the arm for either the Main Baggage Area, Zone A, or Zones A and B as
applicable. Refer to the Baggage discussion on page 6-10 for more information. In this example, the weight is
evenly distributed over the main baggage area.
**NOTE
The basic empty weight used in this example will vary for each airplane. Refer to the
Weight and Balance Record, which follows Appendix A of this section.
Figure 6 - 13
GRAPHICAL METHOD
The multiplying graphs, which begin on page 6-16, can be used to determine the moments for
each weight location. The answer is not as accurate as doing the calculation with a calculator;
however, the margin of error is not significant and within acceptable parameters of safety. The
example arrows in the graphs on pages 6-16 and 6-17 use the data from the sample problem in
Figure 6 - 13.
When using the multiplying graphs, it is more convenient to divide the moments on the Y or
vertical axis by 1000. For example, 70,000 lbs.-in. is read as 70.0 (x 1000) lbs.-in. Once all the
calculations are made, the answer can then be multiplied by 1000. The numbers shown in Figure
6 - 14 are moment values obtained by reading directly from the graphs and are expressed as 1000
lbs.-in. It should be noted that there is a nominal difference in center of gravity location between
the two procedures.
lbs in
lbs
inches
.
.
.
−
=
inches
lbs
in
lbs
5
.
109
.
450
,
3
.
.
788
,
377
=
−