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BEECH
CRAFT Sundowner
180
Section VI
C23 (M-1285 and After)
Wt and
BaWquip
List
INTRODUCTION
TO WEIGHT AND BALANCE
The necessity
for
proper
computation
of the airplane's
weight
and
balance
cannot
be
overemphasized.
In the
basic
design, it
is planned
that
under
normal
loading
the
weight
distribution of
pilot, passengers,
baggage,
and fuel
will
balance
the airplane for flight. Since these items are
all variables,
it is possible
to
concentrate
weight
in such
a
way
as to
make
the airplane
unsafe
for flight. The factors
which
must
be
considered
in
the
weight
and
balance
of the
airplane
are
the
installation
of equipment
after
the air-
plane has been weighed,
trapped or
unusable
fuel, engine
oil,
usable
fuel,
pilot and passenger
weights,
and
baggage
or cargo.
In
order to simplify the computation
of the
weight
and
balance,
Beech
Aircraft Corporation
has
devised
a
form
called
Basic Empty
Weight and
Balance.
When the
air-
plane is
delivered from the factory
it will
first
be weighed
and the
data
recorded
on
this form.
Provision
has been
made
on
the form for
listing
additions
of items
to
be
installed
before
the
delivery
or subtractions
of
items to
be
removed
before
delivery from the
"as weighed"
condition.
This then
represents
the empty weight
of
the airplane.
When the
airplane
is
first fueled, a certain
amount
of fuel
is
trapped
in
the fuel
lines
and
cells which cannot
be
drained.
Also,
in
some regimes
of
flight there
are
certain
amounts
of
fuel that cannot
be used.
The combination
of
these fuel
amounts
is classified
as
unusable
fuel. Also,
it
has been
found that
all
operators
bring
the oil
level near
full
before
each
flight. Thus, these
items
are
computed
along with
the empty
weight,
giving a Basic Empty
Weight
as a
starting
point
to the
pilot
for
each
flight computation.
Once the
Basic Empty
Weight for
a given
airplane
has
been established,
the
pilot is
then
only
concerned
with
the
February
1979
6-3
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