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Cessna 402C - Page 242

Cessna 402C
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SECTION
7
AIRPLANE
&
SYSTEMS
DESCRIPTIONS
COWL
FLAP
SYSTEM
A
cowl
flap
system,
consisting
of
a
cowl
flap
located
on
the
bottom
of
the
nacelle,
is
provided
for
each engine
to
allow
manual
control
of
the
engine
cool
ing
airflow.
Cowl
flap
actuation
is
achieved
by
use
of
a push-
pull
cable
assembly.
The
cowl
flap
control
s,
located
on
the
lower
control
pedestal,
allow
any
intennediate
position
to
be
selected.
A
locking
fea-
ture
is
provided
for
each
control
to
prevent
inadvertent
cowl
flap
control
position
change.
Rotating
the
control
fully
clockwise engages
the
locking
mechanism.
STARTING
SYSTEM
The
starting
system
consists
of
a
24-volt
lead
acid
battery,
a
direct-
~
drive
starter
mounted
on
each
engine,
a
starter
button
for
each
engine
and
necessary
wiring
and components
to
complete
the
system.
The
starter
is
engaged
when
the
starter
button,
located
on
the
left
side
console,
is
pushed, see Figure
7-18.
Pushing
the
button
closes
the
start-
ing
contactor,
allowing
the
starter
to
be
energized.
While
the
starter
is
energized,
a
starting
vibrator
provides
a
high-voltage
current
through
the
left
magneto
at
a
retarded
position
to
assist
the
normal magneto
ignition
~
during
the
start.
ENGINE INSTRUMENTS
Engine
instrumentation
for
each
engine,
see Figure
7-1.
consists
of
mechanical
oil
pressure,
electrical
oil
temperature
and
electrical
cylinder
head
temperature
presented
on
the
combination engine gage. a mechanical
manifold
pressure
gage,
electric
tachometer
and
mechanical fuel flow gage.
The
gages
are
placarded
as
to
their
operational
parameters.
ENGINE MOUNTS
The
engine
is
mounted
to
the
nacelle
structure
by
four
engine mounts.
Each
mount
incorporates
two
rubber pads
capable
of
sustaining
operational
loads
and
providing
absorption
for
engine
vibrations.
ENGINE BREAK-IN PROCEDURE
The
engi
ne
underwent a
run-i
n
at
the
factory
and
is
ready
for
the
full
range
of
use.
It
is,
however,
recommended
that
cruising
be
accomplished
at
~~
165%
to
75%
of
maximum
nonnal
operating
power
until
a
total
of
50
hours has
accumulated
or
oil
consumption has
stabilized.
,-------/CAUTION!-----..,
I
The
purpose
of
operating
at
65%
to
75%
of
maximum
normal
operating
power with Best
Power
or
Recom-
mended
Lean
mixture
is
to
ensure
proper
seating
of
the
rings
and
is
appl
icable
to
new
engines,
and
engines
in
service
following
cylinder
replacement
or
top overhaul
of
one
or
more
cylinders.
1
November
1979
DO\l;r;f'\n
II
_ 1
n".""
...
I-."
..
1no')

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