full in,
it
should
lllumlnate.
The
indicator
lights
contain dimming
shutters
tor
night
operation.
As
an
additional
reminder
that
the
gear
Is
retracted,
a warning
horn
sounds whenever
either
throttle
is
retarded
with the
gear
up.
LANDING
GEAR
POSITION HANDLE.
The
gear
position
handle
has
two
neutral
positions
(slightly above
center
for
gear
up, and slightly below
center
for
gear
down) which give
a
mechanical
indication of
the
gear
position.
From
either
pOSition, the
handle
must
be
pulled
out
to
clear
a detent
before
it
can
be repositioned;
operation
of the
gear
and
doors
will
not
begin
until
the handle
has
been
repositioned.
To
reposition
the
gear,
the handle
is
pulled out and moved
to
the
de-
sired
position, then
released.
Pressure
is
created
in the
system
by the
engine-driven
hydraulic
pump (pumps) and the
gear
is
actuated
to
the
selected
position. A detent in the
gear
handle
system
holds the handle
in
the
operating
position
until the cycle
is
completed; then the handle
automatically
returns
to
neutral
and
pressure
in
the
system
is
relieved.
IMPORTANT
The landing
gear
pOSition handle should be
returned
to
neu-
tral
manually if a malfunction
occurs
in the hydraulic
sys-
tem
which
prevents
the
gear
position
handle
from
returning
to
neutral
after
a cycle
has
been
completed. Continuous
operation
with the handle out of
neutral
keeps
the
system
pressurized
and
will
eventually
result
in
overheating
and
possible
damage.
During a
normal
cycle, the
gear
locks up
or
down and the
position
indicator
light
comes
on. When the light
illuminates,
hydraulic
pressure
is
switched
from
the
gear
actuators
to
the
door
actuators
to
close
the
gear
doors.
When the
doors
are
closed,
the
gear
handle
returns
to
neu-
tral
and the
cycle
is
complete. The
normal
time
interval
between the
in-
dicator
lighting and the handle
returning
to
neutral
is
3-9
seconds. H the
pOliUon
indicator
light
does
not light, the
gear
doors
will not
close
and
hydraullc
pressure
will
be
retained
on the landing
gear
actuators.
A I&fety switch,
actuated
by
the
nose
gear
strut,
restricts
the
gear
po.Ulon handle to
prevent
inadvertent
retraction
whenever the
nose
gear
.trut
II
compressed
by the weight of the
airplane.
1·14
EMERGENCY HAND PUMP.
For
emergency
use,
if
the
engine-driven
hydraulic pump (pumps)
fails,
a manual pump on the cabin floor between the
front
seats
may
be
used
to
extend the
gear.
The
system
reservoir
is
arranged
to
retain
sufficient
fluid to extend the
gear
with the hand pump
if
a
failure
between
the
engine-driven
pump (pumps) and
reservoir
results
in fluid
loss.
See
Section
ill
for
emergency
operation
of the hand pump.
OPERATION
OF
LANDING
GEAR
DOORS (AIRPLANE ON GROUND).
For
inspection
purposes,
the landing
gear
doors
may be opened and
closed
while the
airplane
is
on the ground with the engine stopped.
Oper-
ate
the
doors
with the landing
gear
handle in the
"down-neutral"
position.
To open
the
doors,
turn
off
the
master
switch and
operate
the
hand pump
until
the
doors
open. To
close
the
doors,
turn
the
master
switch
on and
operate
the
hand pump.
NOTE
The poSition
of
the
master
switch
for
gear
door
oper-
ation
is
easily
remembered
by
the following
rule:
OPEN
circuit
= OPEN
doors
CLOSED
circuit
= CLOSED
doors
PARKING
BRAKE
SYSTEM.
A double-button
push-pull
control
knob,
located
below the
left
hand
.witch
and
control
panel,
is
used to
set
the
hydraulic
parking
brakes.
Simply apply
pressure
to
the
brake
pedals,
and,
at
the
same
time,
squeeze
the buttons of the
parking
brake
control
knob and pull the knob out. H
deSired,
the
brake
pedals
may be "pumped" to
insure
an
absolute
"full
pedal"
after
setting
the
brake
knob. To
release
the
parking
brake,
push
the
control
knob in.
CABIN
HEATING,
VENTILATING
AND
DEFROSTING
SYSTEM.
Three
levers
located
on the lower
right
side
of the
instrument
panel
2-1~i
i
.~
.....
.
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