AIRPLANE
OPERATIONS
MANUAL
WEIGHT AND
BALANCE
SEPTEMBER 20, 1999
1-06-50
Page
1
Code
01
BALANCE CHART
The balance chart is a document used to check whether the aircraft
center of gravity is located within the approved limits.
Balance charts may be prepared in two basic formats:
• Diagram format: is a balance chart with vertical lines for the
moment scales, in which the pitch between each line refers to a
predetermined load. To determine the aircraft trim it is necessary to
draw vertical lines moving to the left and right depending on aircraft
load.
• Table format: is a balance chart with index influence tables for each
compartment or passenger cabin. To determine the aircraft trim it is
necessary to perform addition and subtraction calculations and then
draw the result into the CG envelope.
The example shown in the next page is a diagram format balance
chart. In order to use it, the following steps must be followed:
1. Enter the aircraft OEI in the Basic Index scale.
2. Write the wardrobe (WRDB), cargo compartment (CGO 1) and
number of passengers per cabin (PAX A, B and C) into the
appropriate boxes.
3. Draw from the BOI value in the Basic Index scale the CG shift due
to WRDB load. From the WRDB final point draw the CG shift due to
CGO 1 and so subsequently for PAX A, B and C. The direction for
each CG shift is indicated by the arrow.
4. Enter the aircraft OEW in the Basic Weight box and the total
payload in the Payload box. Add the values to obtain the ZFW,
enter the takeoff fuel weight into the Fuel box and add them to
obtain the TOW.
5. From the last position determined in step 3, draw a vertical line into
the CG envelope until it crosses a horizontal line at the ZFW. The
crossing point determines the ZFW-CG and if it is located outside
of the ZFW envelope, a new loading distribution must be made.
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