Cessna T188C - Boom Assemblies; Streamlined Boom Assemblies; Removal and Installation; Setting Boom Chord Angle of Incidence

MODEL
188
&
T188
SERIES
SERVICE
MANUAL
check
hose connections
for tightness
and deteriora-
19-19.
INSPECTION.
Inspect hose
connections for
tion.
See
figure
19-11
for component
parts
of
the
tightness
and
deterioration.
Check
booms
for cor-
Y-strainer assembly.
rosion.
19-18.
BOOM ASSEMBLIES
are shown
in figure 19-4,
19-20. NOZZLES.
The
booms are equipped
with
which may be used as
a guide for removal and re-
non-adjustable nozzles.
Fluid pressure moves a
placement. For quick removal
of individual booms:
spring-loaded diaphragm in the
nozzle to allow liquid
a. Loosen
clamps and disconnect
hoses,
or release
to enter the core
of the nozzle,
where it is diffused
quick-disconnects
attaching
boom assembly
to
Y-
and emitted
as spray.
Hold
nipple and
turn nozzle,
strainer
assembly.
using wrench pad
on nozzle body,
to remove.
b.
Remove bolt,
washer, and
nut from clamp
halves, then
pull upper and lower clamp
tabs from
NOTE
slots in clamp
retainers,
and pull
boom aft.
Nozzle
direction
may
be changed
by
rotating
19-18A.
STREAMLINED
BOOM
ASSEMBLIES
(BE-
the
booms
in their
clamps.
GINNING
WITH 18803872.)
(See figure
19-4.)
19-21.
DISASSEMBLY.
When
disassembling
a
19-18B.
REMOVAL AND INSTALLATION
- STREAM nozzle,
hold nozzle with outlet up
and carefully
LINED BOOM
ASSEMBLIES. (See figure
19-4, sheet disassemble,
noting exact relationship of
parts for
4
of 4).
reassembly.
For quick
removal
of Individual
booms:
a. Disconnect coupling (16)
from y-strainer assem-
19-22. ROTARY ATOMIZER
OPTION. Figure
bly
(18).
19-19
shows the rotary atomizer available
with the
b. Remove nuts (6) and bolts
(4) then remove boom
1979 Model Year airplane. The
atomizers replace
(8).
nozzles
in this application.
Refer
to Vendor Publi-
c. For installation,
install bolts
(4) through
clevises
cations for
complete
description,
operation,
and
(5) and
boom
supports
(7), and
install
nuts (6).
maintenance.
Vendor
publications
are
available
d.
Index
booms
in accordance
with
paragraph
19-18C.
thru
the
Cessna
Supply
Division.
19-18C.
SETTING
BOOM CHORD
ANGLE
OF INCI-
19-23.
PRESSURE
GAGE.
A
direct-reading
pres-
DENCE.
(See
figures
19-4, sheet
4 of
4 and
19-4A.)
sure
gage
is mounted
in
the instrument
cluster
above
a. With booms
installed,
loosen
nuts (6)
and bolts
the
panel pad
in the cockpit.
The
gage is connected
(4) on one boom
(8).
by tubing to a
fitting on the pump
discharge
tube,
b.
Loosen clamps
(17).
left inboard
boom,
or the Y-strainer
assembly,
and
c. Disconnect
coupling
(16).
indicates
boom pressure.
To remove
gage from
d. Insert indexing
pin (MS20392-1C33)
in
indexing
instrument panel,
disconnect
tube from back
of gage
hole
in the outboard
boom
support
(7) and rotate
and
unscrew
bezel attaching
gage
to panel.
boom
(8) until
indexing
pin
is contacted
by
clevis
(5).
e. Tighten
nut
(6) on bolt
(4) at outboard
boom
sup-
19-24.
QUICK-LOADER
SYSTEMS.
Three quick-
port.
loader installations
are
available
as optional
equip-
f.
Using
a C-clamp,
secure
a .
125 plate
outboard
ment.
The
left-hand,
right-hand,
and dual
installa-
of the
boom
support,
shown
in
figure
19-4A.
tions
are
shown
in
figure
19-16.
A manually
oper-
g.
Attach
an inclinometer
to the
plate
as
shown
and
ated
valve
controls
flow
of material
into
the
hopper.
set
to 00.
On the
dual
installation,
be sure
that
only
the valve
being
used is
opened.
Removal
and
installation
of
NOTE
the quick-loader
system
may be
accomplished
while
using the
illustration
as a guide.
Inspect
hose
con-
An
inclinometer
is available
from
the Cessna
nections
for tightness
and deterioration.
Check
the
Supply Division,
See figure 6-4.
valves
for proper operation.
Seal
all inside corners,
edges,
and
openings
in and
around
boxes
(3)
with
h. Being
careful not
to move the dial
on the inclino-
General
Electric RTV
102, Dow Corning
732 RTV,
meter,
remove
c-clamps,
plate,
and inclinometer
or
equivalent
sealant.
from
outboard
location
and
move
to next
inboard
boom
support.
i. With
plate and
inclinometer
installed,
read the
CAUTION
degree
of angle and
make necessary
adjustments
by
In
freezing
weather,
drain the
hopper and
rotating
boom
so angle
of
incidence
reads
0.
quick-loader
valves.
Leave
valves
open
j. Tighten
nut
(6) and
bolt (4)
at this
location.
to prevent
damage.
k. Repeat
procedure
for the
two inboard
boom
sup-
ports.
1.
Tighten
hose clamps
(17).
m.
Connect
coupling
(16).
n. Remove
indexing
pin.
o. Repeat
steps
a.
through
n. for
opposite
boom.
Revision 1 19-21