CSP−HMI−2
MD Helicopters, Inc
.
MAINTENANCE MANUAL
08−10−00
Page 201
Revision 39
WEIGHT AND BALANCE
MAINTENANCE PRACTICES
1. General Weight and Balance Information
(1). Removal or addition of fuel or equip-
ment results in changes to weight and
balance of a helicopter, and the permis-
sible useful load is affected accordingly.
These changes must be investigated to
eliminate possible adverse effects on
the helicopter’s flight characteristics.
(2). Basic weight and corresponding center
of gravity is determined by weighing
the helicopter without crew and
payload; however, basic weight does
include trapped and unusable fuel, full
operating fluids, lubricants, etc., and
installed equipment.
(3). 369D/E/FF − 500N − The longitudinal
reference datum is located 100 inches
(254 cm) forward of the main rotor
centerline. The lateral reference datum
is located along the longitudinal
centerline of the helicopter. The vertical
reference datum is located at a point
100 inches (254 cm) below the center of
the main rotor blades.
(4). 600N − The Weight and Balance
longitudinal reference datum is located
100 inches (254 cm) forward of the
main rotor centerline or 15 inches (38.1
cm) aft of the aircraft nose. The Weight
and Balance (longitudinal) Reference
Datum is different from the Fuselage/
Engineering Reference Datum (Ref.
Section 06−00−00). The lateral refer-
ence datum is located along the longitu-
dinal centerline of the helicopter. The
vertical reference datum is located at a
point 83 inches (210.8 cm) below the
center of the main rotor blades.
(5). Refer to the following for balance
NOTE:
Weight and balance information for op-
tional equipment is found in the Initial In-
stallation section for the optional equip-
ment.
Parameter
Wt
lb/kg
Certified Gross Weight (369D/E)
3000/1362
Certified Gross Weight (369FF)
3100/1407
Certified Gross Weight (500N)
3350/1521
Certified Gross Weight (600N)
4100/1860
Cargo Deck Capacity
(369D/E/FF
−
500N)
1300/590
Cargo Deck Capacity (600N)
1350/613
Cargo Deck Capacity not to exceed 115 pounds per
square foot.
Certified Gross Weights are for weight
−
on
−
skids.
A. Approved Center of Gravity Limits
(Ref. PFM)
B. Terminology
Following are terms with definitions, used
when determining helicopter weight and
balance:
(1). Arm: The distance in inches from the
longitudinal (longitudinal arm) and
lateral (lateral arm) reference datum of
a part to the center of gravity (CG) of
the part.
NOTE:
When viewing helicopter from rear,
items to left of lateral reference datum (cen-
ter line of helicopter) will be expressed as
having negative (−) lateral arm, and those
items to right of reference datum, a positive
(+) lateral arm.
(2). Center of gravity (CG): A point on a
part where the part will be perfectly
balanced. Center of gravity is measured
in inches from a known reference. It
can be determined using the following
formula:
