Cessna 172P - Airplane Weighing Procedures

CESSNA
SECTION
6
MODEL 172P
\VEIGHT
&
BALANCE/
ESUIPMENT
LIST
INTRODUCTION
This section describes the
procedure
fòr establishing
the basic
empty
weight and moment of the atrplane.
Sample
fon¡rs
are
provided
for
reference. Procedures for
oalculating
the weight and
moment
for various
operations are also
provided.
A oomprebengive
list of
aII Cessna
equip-
ment available for this airplane is included at
the back
of
this section'
It
should be noted
that specific information
regardingtho
weight,
arm'
moment and installed equipment
for this airplane
as delivered
from tbe
factory can only be found in
the
plastic
envelope
carried
iu
the backofthis
handbook.
It is
the
responsibility
ofthe
pilot
to ensure
that the airplane
is loaded
properly.
AIRPLANE WEIGHING
PROCEDURES
1.
Preparation:
a. Inflate
tires to recommended operating
pressures.
b. F,emove the
fuel
tank
sump
quick-drain
fittings and fuel
selector
valve drain
plug
to drain
all fuel.
c.
Remove oil sump drain
plug
to drain all oil
d. Move
sliding
seats
to the most
forward
position.
e. Raise
flaps to the fully retracted
position.
f.
Place all control
surfaces
in neutral
position.
2. Leveling:
a. Place scales
undor
each wheel
(minimum
scale capacity,
500
pounds
nose, 1000
pounds
each main).
b. Deflate
the nose tire and/or lower
or
raise the nose strut
to
properly
center the bubble
in
the level
(see
figure 6-1).
3.
Weighing:
a.
With
the airplane level and
brakes released, record
the
weight
shown
on each scale. Deduct
the tare, if any, from
each
reading.
4.
Measuring:
a. Obtain
me&surement
A by measuring
horizontally
(along
the
airplane
center line) from
a line
stretched
between the main
wheel
centers to a
plumb
bob
dropped from
the firewall.
b.
Obtain measurement
B by
measuring horizontally and
paral-
lel to the
airplane
center
line,
from center of
nose wheel axle,
left
side, to
a
plumbbob
droppedfrom
the linebetween
the
main
wheel
centers,
Repeat
on right
side
and average
the measure-
ments.
5.
Using weights
from item
3
and measurements from item
4,
the
airplane weight
and
C.G.
can
be determined.
6.
Basic
Empty
Weight may
be determined
by
completing figure 6-1.
3O
May
1980
6-3