Cessna T188C - Emergency Dump Control; Flow Control; Rigging

MODEL
188
&
T188
SERIES
SERVICE
MANUAL
accelerator
to
100
parts
base
by
volume.
These
age.
Install
bolt,
washer,
nut
and
cotter
pin.
materials
are
available
from
the
Cessna
Supply
Spray
Valve
Control
illustrated
in
figure
19-4
Division.
The
adapter
attaching
bolts
must
be
a.
Pull
control
handle
(7)
to
full
AFT
position.
sealed
inside
the
hopper
with
epoxy.
any
exist-
b.
Push
lever
on
spray
valve
to
full
FORWARD
ing
sealant
at
the
adapter
must
be
removed
be-
position.
fore
applying
new
sealant.
Any
surface
to
be
re-
c.
Attach
control
cable
assembly
(12)
to
bottom
of
sealed
on
the
hopper
must
be cleaned
with
acetone,
handle
(7)
and
spray
valve
lever.
Methyl
Ethyl
Keytone,
or
a
similar
solvent,
and
d.
Adjust
control
cable
assembly
as
required
to
dried
with
a
clean
cloth
before
the
solvent
evapor-
allow
control
handle
to
actuate
spray
valve
lever
to
ates,
to
assure
a
residue-free
surface
for
max-
full
OPEN
and
full
CLOSED
position.
imum
adhesion
of
the
sealant.
NOTE
NOTE
Early adapters
at
the bottom
of the
hopper
Support
assembly
(16)
may
be
moved
forward
were
originally
sealed
with
epoxy.
However,
or
aft on
discharge
tube for
further
adjustment.
were
originally
sealed
with
epoxy.
However,
later
hoppers
are
sealed
with
the
EC1675
type
sealant,
which
should
be
used
when
installing
Before
attempting
repairs
to
the
dispersal
an
adapter
on
the
early
hoppers.
system,
make
sure
that
hopper
is
clean
and
empty.
Due
to
extreme
toxicity
of
Agricultural
Chemicals
Personal
Safety
19-8.
PUMP
ASSEMBLY.
Component
parts
of the
Agricultural
Chemicals
Personal
Safety
pump
assembly
include
a
bottom
plate
for
attachment
must
come
first.
to the
hopper
adapter
flange,
a
removable
strainer,NOTE
an
emergency
dump
gate,
a
flow-control
valve,
and
a centrifugal
pump.
The
pump
is
driven
by
a
two-
blade
wood
fan
mounted
on
a strut
or
on an
angle
A major
source
of trouble
in
dispersal
drive
which
extends
down
into
the
airstream.
The
systems
is
clogged
strainers
and
other
fan
is
equipped
with
a
one-piece,
steel-drum
brake.
components,
caused
by
inadequate
clean-
The
fan
brake,
flow-control
valve,
and
emergency
ing.
dump
gate
are
controlled
from
the
cockpit
by
the
pilot.
19-12.
EMERGENCY
DUMP
CONTROL.
On
all
dry
and
liquid
dispersal
systems,
except
the
"BOOM
19-9.
REMOVAL
AND
INSTALLATION.
MASTER",
the
emergency
dump
gate
is
controlled
a.
Disconnect
fan
brake
control,
emergency
dump
by
the
Flow
Control
handle,
described
in
paragraph
control,
and
connecting
rod
at
flow-control
valve.
19-10.
Raise
adjustable
stop
which
allows
control
b.
Disconnect
discharge
tube
at
pump
assembly.
handle
to
be
pushed
to
the
full
FORWARD
position,
c.
Unclamp
or
unbolt
pump
assembly
and
remove
opening
the
gate
box
door
fully
to
jettison
the
contents
from
hopper.
of
the
hopper.
Pulling
the
control
full
AFT
will
close
d.
Install
pump
assembly
by
reversing
the
preced-
the
gate
box
door
in
flight.
Rig
this
control
accord-
ing
steps,
rigging
controls
as
outlined
in
applicable
ing
to
instructions
outlined
in
paragraph
19-11.
paragraphs
in this section.
On "BOOM
MASTER" systems through Serial
No.
19-10.
FLOW
CONTROL.
(See
figure
19-3.)
Mate-
188-0317,
a tee
handle,
mounted
under
the
left
side
rial
flow
from
the
hopper
is
controlled
by
a handle
in
of
the
instrument
panel,
controls
the
emergency
the
cockpit.
The
handle
is
moved
along
a
fixed
micro-
dump
gate.
The
emergency
dump
gate
must
be
closed
meter
screw
mechanism
to
a flow
rate
position
that
by
hand
once
the
control
handle
has
been
pulled.
On
is
determined
by
an
adjustable
stop
on
the
micro-
Serials
188-0001
thru
188-0003.
with
original
con-
meter
screw.
A
crank
on
the
micrometer
Screw
may
trols,
no
rigging
is
provided:
if the
control
assembly
be
operated
from
the
cockpit
to
set
the
stop.
On
the
is
the
correct
length,
rigging
is automatic.
From
STRUT
MASTER"
system,
the
gatebox
flow
hand
Serial
No.
188-0004
thru
188-0317,
a
Bowden
type
control
serves
as
an
emergency
dump
control.
The
control
is
used.
Rigging
is
accomplished
as
follows:
rubber
boot
at
the
fuselage
underside
should
be
check-
a.
Loosen
clamps
securing
control
housing.
ed
frequently
for
damage
which
would
allow
chemicals
b.
Open
emergency
dump
door.
(Attach
control
if
to
enter
the
cockpit.
The
"STRUT
MASTER"
system
not
already
attached.)
employs
a separate
spray
valve
control.
This
con-
c.
Tighten
clamp
nearest
door
end
of control
trol
is
installed
in
the
left
door
jamb
next
to
the
en-
housing.
gine
throttle.
The
control
handle
actuates
a
flexible
d.
Close
emergency
dump
door.
control
which
is attached
to
the
spray
valve
arm
at
e.
Push
tee
handle
to
full
FORWARD
position.
the
gate
box.
f.
Shift
housing
in its
clamps
as
necessary
to
en-
able
wire
to
pass
through
hole
in
clamp-bolt
at
tee
19-11.
RIGGING.
handle,
and
tighten
remaining
clamps.
Flow
Control
illustrated
in figure
19-3:
g.
Tighten
clamp-bolt
at
tee
handle.
a.
Pull
control
handle
(15)
to
full
AFT
position
h.
Bend
wire
tip
90 degrees
to
prevent
wire
from
b.
Push
lever
on
flow
control
valve
to
full
FOR-
being
withdrawn
if
attaching
nut
should
become
loose.
WARD
position.
i.
When
installing
new control,
it
may be
necessary
c.
Attach
connecting
rod
(12)
to
bottom
of
arm
(13).
to
shorten
wire
and/or
housing.
d.
Adjust
rod
end
(22)
as
required
to
align
with
Beginning
with
Serial
No.
188-0318,
a
ring
handle,
hole
in
control
valve
lever
or
to
gate
box
door
link-
mounted
on
the
left
side
of
the
crash
pad,
controls
19-8
Revision
1