Cessna T188C - Page 473

MODEL
188 & T188
SERIES SERVICE
MANUAL
19-59 AUTOMATIC FLAGMAN. (See figure
b. Keep
water from entering and
running down into
19-59. AUTOMATIC
FLAGMAN. (See figure)
the solenoid.
if the solenoid should fail because
of
excessive foreign material
or water, it can be taken
19-60.
DESCRIPTION.
The
Automatic
Flagman
apart,
cleaned
and
reassembled.
The
plunger
should
have a shiny outside surface. If this should become
dispenser
is located
on top
of the right
stub wing,
just have
a outside
become
outside of
the catwalk.
The unit
ejects a
disposable
rusted, it
should be
taken apart
and polished
with
paper streamer attached to
a piece of cardboard
very fine sandpaper. The use
of liquid fertilizers,
which serves as a weight.
The flag lands in the
which may come in contact with
the solenoid, will
center of the swath being sprayed upon actuation adversely affect its operation. Protect the solenoid
of
an electric solenoid
by the pressing
of a trig-
by
spraying the inside
with silicone
spray if using
ger on the
control stick.
Air pressure
is
fed in
liquid
fertilizers.
Generally,
the
solenoid
should be
from
the
slipstream
through
a hole
in the
front
of
cleaned
each
50 hours
or
more often
if under
dirty
the
nose cone
and
is transmitted
onto
the flags
in
field conditions.
dispenser
and feeds them to the rear, holding
them c. The contact
points of the electrical switch
should
firmly against
the rear
stops.
be cleaned
each 100
hours.
CAUTION.
DO NOT USE THE
AUTOMATIC FLAGMAN
WHEN Be sure that
switching of the solenoid is
so
USING
SULPHUR
DUSTS
AS THE
SOLENOID
as not to
have continuous
current
to the
COULD
CAUSE
A FIRE
IN
THE DUST.
solenoid
or it will
burn
out. A
momentary
button on top of the control stick will burn
19-61.
REMOVAL.
(See
figure
19-8.)
up
solenoids
when
erroneously
activated
a. Remove screws and washers attaching nose cone by pilots lacing hard hats on top of the
(9)
to bracket
(11).
stick
while
away
from
the
aircraft.
b. Remove
(13) screws attaching
nose cone (9)
to
dispenser
(3);
remove
nose cone.
c. Disconnect electrical leads (14) at socket and
housing (19) and remove bolts
and nuts attaching This
information
supplements vendor instructions
solenoid (1); remove
solenoid.
stowed in
the arcraft
d. Remove
bolts and
washers attaching
dispenser
19-84.
BOOM PRESSURE
VALVE AND
CONTROL
to
bracket (12).
KNOB. (See figure
19-21, sheets
9 and 10.)
e. Remove bolts
attaching
supports (5) to
support
(18):
remove dispenser (3).19-65.
DESCRIPTION.
(18801375 thru
18801682), a
f.
Remove two access covers under
stub wing and boom pressure
valve n the hydraulic
system is used
disconnect
electrical
leads at
terminals.
disconnect
electrical
leads
at
terminals.
to
regulate
dispersal
system
boom
pressure
to a
pre-
g. Pull
tubing (16)
and leads
(14) out
through grom-
scribed setting.
When
the hydraulic
system
is op-
met (15). erating and the boom pressure valve is closed, all
19-62.
INSTALLATION.
(See figure
19-8.)
pressure
being
developed
in
the system
is directed
to
the hydraulic
motor and
the motor drives
the spray
a
Place dispenser
(3) on right
stub wing and in-
the hydraulic
motor
and th motor
drives the spray
pump at maximum output. This condition would re-
stall bolts and
washers attaching
dispenser
to bracket pump
by rotating
the boom pressure
control knob
lo-
(12). .
cated below
the left side of the instrument
panel, to
b. install
bolts attaching
supports (5)
to support (18).
an index setting
of 9. If less
boom pressure
is re-
c.
Position nose
cone (9)
and install
screws
and an
index setting
of
9. If
less boom
pressure is
ro-
quired, the boom pressure control knob can be ro-
washers attaching nose cone
to bracket (11); install
tated back to any index from 9
to 0. The index num-
(13)
screws attaching
nose cone to
dispenser.
bers
do not indicate
a specific pressure
but are for
d. install
solenoid
(1) on
dispenser.
index
purposes
only,
and are
useful
in
establishing
e.
Remove
two
access
covers
under
stub
wing,
similar
pressures
on successive
spray
runs.
A stop
route tubing
(16) and leads (14) through grommet
(15); bolt normally
limits the amount the boom
pressure
connect
leads at
terminals
inside stub
wing.
valve is
open, as
indicated by
an index
setting of
0.
f. Connect
electrical
leads at socket
and housing(l
9
). Under
some conditions
where the operator
is using
22 nozzles
with
small
orifices,
he
may
want
to
back
19-63.
INSPECTION
AND MAINTENANCE.
out the
stop
bolt to
allow
more
opening
of the
boom
a. The
inside surface
of the
dispenser
is waxed
and
pressure
valve for
a greater
reduction of
boom pres
contains a smooth,
dirt-free
finish. Care
should be sure.
The stop
bolt is attached
to the boom pressure
taken
to prevent
entry
of foreign
material
or water.
valve
bracket
and is accessible
by
removing
the left
The inside
of the
dispenser
should be waxedfuselage
side
panel.
occasionally.
19-55