Eagle ICA-D212-725, Instructions Manual

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ICA-D212-725 (08)
Page 3 of 15
CHAPTER 08 – WEIGHT AND BALANCE (08-00-00)

COPYRIGHT

2007 BY DART AEROSPACE LTD.

THIS DOCUMENT IS PRIVATE AND CONFIDENTIAL AND IS SUPPLIED ON THE EXPRESS CONDITION THAT IT IS NOT TO BE USED FOR ANY PURPOSE OR COPIED OR COMMUNICATED TO ANY OTHER
PERSON WITHOUT WRITTEN PERMISSION FROM DART AEROSPACE LTD.
Revision:
0
Date: 07.05.31
8.1 WEIGHT AND BALANCE
The center of gravity (CG) is considered to be the
balancing point of a body for weight and balance
Purposes. The helicopter can be compared to a
pendulum; the point of suspension being where
the main rotor hub intersects the mast (the
pendulum weight being the helicopter). If the
pendulum weight is allowed to stop, it will come to
rest directly below the suspension point. For
example: If the CG of a helicopter is aft of the hub-
mast intersection, the helicopter will be tail low in
flight. The pilot can correct this condition by
moving the cyclic control stick forward. If the
required movement of the stick is great enough,
the pilot will use all available control, thus limiting
maneuverability and forward speed. Since such
loss of maneuverability is unsafe, Care shall
always be taken to keep the helicopter center of
gravity within operational limits. Moving the CG is
accomplished by adding or removing ballast.
NOTE
For additional weight and balance information,
operators shall refer to information issued by the
governing civil aviation authority.
8.2 LEVELING
NOTE
Leveling plate (2, Figure 8-1) is graduated in
increments of 1/4°. The plate is located on cabin
floor just inside left passenger cargo door. A
slotted hole in upper door frame is provided for
suspension of a plumb bob (1).
8.2.1
Support helicopter on jacks (Chapter 7).
8.2.2
Hang plumb bob (1) in slotted opening
in door frame with point of plumb bob just above
leveling plate (3) on cabin floor.
8.2.3
Adjust height of jacks to bring plumb
bob (2) exactly over the point where two lines
intersect at 0° on leveling plate. Helicopter is now
leveled both longitudinally and laterally.
8.2.4
Remove plumb bob (2).
8.3 WEIGHING
The helicopter should be weighed in a
Configuration as near Weight Empty as possible.
NOTE
Weight Empty condition is the basic helicopter
together with seats, ballast, special equipment,
transmission oil, hydraulic fluid, unusable fuel, and
un-drainable oil.
8.3.1
All kits, transmission oil, and hydraulic
fluid may remain aboard.
8.3.2
Ensure baggage compartment is empty.
8.3.3
Scale accuracy should be within plus or
minus 1.0 lbs.
8.3.4
Position scales in an approximately level
area, and check for proper adjustment to zero
position.
CAUTION
WEIGHING SHOULD NOT BE ATTEMPTED IN
AN OPEN AREA BECAUSE OF THE ADVERSE
EFFECTS OF WIND.
8.3.5
Position a scale and jack assembly
under each jack pad or under each forward jack
pad and one aft jack pad. Raise helicopter clear
of floor.
NOTE
For electronic scales, ensure load cells and
adapters are fastened securely to jacks.
Accomplish scale manufacturers recommended
warm up time and zero each load cell.
8.3.6
Level helicopter (paragraph 8.2).
8.3.7
Balance each scale and record its
reading.