WEIGHT AND BALANCE
145 140 135 LB
AIRPLANE
OPERATIONS
MANUAL
1-06-15
Page
4
Code
02
REVISION 37
AOM-145/1114
BALANCE REFERENCE SYSTEM
(EMB-135 ER AND LR MODELS)
BALANCE ARMS/BODY STATION
Longitudinal location of the Centers of Gravity (CG) identified
throughout this Manual regarding airplane and components will be
referred to as Balance Arms. Balance Arms are the distance in inches
from the Airplane Datum which is located at the zero station of the
fuselage.
Balance Arms (BA) are equivalent to Body Station (BS) on the
EMB-135 ER and LR models.
AIRPLANE DATUM
The Airplane Datum is a plane, perpendicular to the fuselage
centerline, located at 456.50 in ahead of the wing stub front spar.
For external reference, the Datum is located at 570.63 in ahead of the
wing jack points.
WING MEAN AERODYNAMIC CHORD (MAC)
The length of the MAC is 112.80 in.
The leading edge of the MAC (LEMAC) is Balance Arm 495.83 in.
Percentage of MAC is obtained using the following formula:
%MAC =
(X 495.83) 100
112.80
u
where X = Balance Arm of airplane CG measured in inches.
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