SECTION
6
WEIGHT
&
BALANCE
fM~,402C
a.
Turn
off
all
electrical
power.
b.
Turn
fuel
selectors
OFF.
.
c.
Remove
engine cowling.
d. Disconnect
inlet
fuel supply
hose
at
the
inlet
side
of
the
engine-driven fuel
pump.
e.
Connect
defueling
hose
to
inlet
fuel supply hose.
f.
Turn
fuel
selectors
ON
and
defuel
wing
until
all
possible fuel
is
removed.
g. Drain the remaining fuel through the drain valves into
an
appropriate container.
(1)
The
main
tanks are drained
by
opening the drain valve
on
the
bottom
of
each
tank
sump.
The
main
tank fuel lines
are drained
by
removing
a fuel
sump
drain valve located
at
the
wing
gap
fairings.
inboard
of
the respective engine
nacelle.
The
right
and
left
fuel
filters
are drained
aft
of the
main
spar inboard
of
each
main
fuel tank.
(2)
Each
drain should
remain
open
until the defueling
rate
slows to approximately 1
drop
per second.
(3) Drain fuel
selector
valves
and
fuel crossfeed
lines.
h.
The
fuel remaining on-board
after
defueling
is
residual fuel
and
is
included in the basic
empty
weight.
i.
Drainable unusable fuel
must
be
added
after
the weighing to
obtain basic
empty
weight. Figure 6-1 includes the weight
and
arms
necessary to
add
the drainable unusable
fuel.
11.
The
airplane
must
be
level
when
weighed.
a.
For
longitudinal leveling.
two
bolts are located
on
the
right
side
of
the fuselage
at
stations
214
and
238.
Unscrew
these
two
bolts approximately 1/4 inch
so
a
spirit
level
can
be
pl
aced
on
them.
b.
For
lateral
leveling.
use
a
spirit
level
on
the underside of
the fuselage
at
station
154.0.
12.
When
weighing
on
the wheels
or
jack points with mechanical
scales.
insure the scales are in
calibration
and
used
per the applicable
manufacturer1s recommendations.
When
weighing
on
the wheels.
deflate
or
inflate
the gear
struts
and/or
tires
until
the airplane
is
level.
r-------ICAUTION\-----..,
Keep
the airplane level while jacking to prevent the
airplane
from
slipping
off
the jacks
and
damaging
the airplane.
13.
When
weighing
on
the jack points with
electronic
weighing
scales,
attach the electronic weighing
cells
to the proper
mounting
adap-
ters
to prevent slipping.
a. Prepare the electronic weighing
kit
for
use
by
following the
manufacturer1s instructions provided with the weighing
kit.
Adjust
all
jacks simultaneously until the
cells
are in contact
with the jack points. Continue jacking, keeping the airplane
level,
until the airplane
is
supported
at
the jack points only.
6-2
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