Cessna T188C - Page 202

MODEL
188
&
T188
SERIES
SERVICE
MANUAL
NOTE
continued
or
severe
cracking.
replace
airbox.
Inspect gaskets
and
install new
gaskets. if
If at
static
run-up,
rated RPM
cannot
be
damaged.
Inspect
alternate
spring-loaded
door for
achieved
at
full
throttle,
adjust
pump
freedom
of operation
and
complete
closing.
pressure
slightly
below
limits
making
Beginning
with
aircraft
serial
18800833
use
the
certain
the correct
pressures
are
obtained
preceding
cleaning
and
inspection
procedures
when
rated
RPM
is
achieved
during
take-
applied
to
the adapter
assembly
instead
of
the
off
roll.
airbox.
Check
manually
operated
air
door
or
rotary
air
valve
for
ease
of
operation
and
proper
k.
After
correct
pressures
are obtained,
safety
rigging.
Rotary
air valve
is
factory
lubricated
adjustable
orifice
and
orifice
lockout.
with
a dry
lubricant.
stiff
operating
valve
should
be
I Remove
test
equipment.
run
engine
to check
removed
and replaced.
for
leaks
and install
cowling.
11A-56A.
INSTALLATION
OF INLET
DUCTS.
When
11A-53. INDUCTION
AIR SYSTEM.
cutting duct assembly
to length, the support wire
should
be cut back far
enough to bend
back (minimum
11A-54.
DESCRIPTION.
Ram
air enters
the
bend radius
1/8 inch)
under the
clamp and
protrude
induction air system through
a filter at the front of 1/4
inch. Do not break the bond
between the wire and
the lower cowling. Thru
aircraft serial 18800832
the fabric. Before tightening
the clamps, make sure
this air is ducted to the airbox at the fuel-air there is no twist or torque on the hose. If the hose is
control unit. A spring loaded alternate air door is wrapped with MIL-Y-1140 cord in place of the wire
incorporated in the airbox and will open by engine support, the same installation procedure applies
suction if
the air filter should become
clogged. except; MIL-Y-1140
has no minimum bend
radius
This permits unfiltered induction air to be drawn requirement.
from
within
the engine
compartment.
Beginning
with aircraft serial
18800833 the induction air
is The minimum bend
radius for wire supported hose
ducted to the fuel-air control unit through an in the plane of bend is as follows:
adapter
which is mounted
on the lower
cowl
1. Neoprene,
one ply
hose - 1/4 diameter
of the
assembly. An alternate air door is incorporated in maximum hose dimension.
the adapter assembly and is
manually-operated by
2. Neoprene, two ply hose
and silicone one ply
a locking control
in the cockpit.
Unlocking
and
hose - 1/3 diameter
of the maximum
hose dimension.
pulling the
control out will allow unfiltered
4. Silicone
two ply hose - 1/2 diameter
of the
induction
air to
be drawn
from
within
the engine
maximum
hose
dimension.
compartment
if the air
filter should
become
clogged.
Beginning
with
aircraft
serial
18802860
11A-57.
INDUCTION
AIR FILTER.
the alternate air door
is replaced with a rotary
air a. (THRU AIRCRAFT
SERIAL 18801374.)
valve. Operation of
the rotary air valve
from the (Refer
to Section 11.)
cockpit
is the same
as the alternate
air door.
b.
(BEGINNING
WITH AIRCRAFT
SERIAL
18801375.)
(See
figure
11A-6,
sheet
6.)
11A-55.
AIRBOX
REMOVAL
AND
Disengage camloc-type
studs
(12) of cover
INSTALLATION.
assembly
(11) until
filter (6) can
be removed.
(THRU
AIRCRAFT SERIAL
18800832.)
Replace
filter and
engage studs
to install.
a. Remove
lower cowling
section in accordance
c (BEGINNING
WITH
AIRCRAFT SERIAL
with
paragraph
11A-3.
18802860.)
(See figure 11A-6,
sheet 7.)
b.
Disconnect
throttle
and
mixture
controls
at
Remove
wing
nut (49)
of cover
assy.
(50).
Replace
bellcranks.
filter (51)
and cover assy.
to install.
c.
Disconnect
electrical
wiring
at
air temperature
inlet
probe,
and tape
ends as
a safety
precaution.
11A-58.
ALTERNATE
AIR CONTROL.
d. Disconnect
drain
line at airbox.
(BEGINNING
WITH
AIRCRAFT
SERIAL
e.
Remove
safety
wire from
mounting
bolts.
18800833.)
(See
figure 11A-6,
sheet
5.)
remove
bolts
securing
airbox
to
fuel-air
control
unit and
remove airbox
and gasket.
NOTE
f.
Reverse
the
preceding
steps
for
reinstallation
Use a
new gasket
each time
Cowling
must be properly
installed
prior
removal
is necessary.
to rigging
of alternate
air control.
g.
Rig
throttle
and
mixture
controls
in
accordance
with
paragraphs
11A-63 and
11A-64
a. Loosen
jam nuts
at both
ends of
rod assembly
respectively.
(42).
h. Connect
and adjust
throttle-operated
auxiliary
b. Disconnect
ball
joint (43)
from ball
on arm
fuel pump
microswitch
in accordance
with Section
assembly
(44).
12.
c. Adjust
ball
joint (43)
on rod assembly
(42)
until
sufficient
threads are
engaged.
11A-56.
CLEANING
AND
INSPECTION.
Thru
d
Screw rod
(42) into
rod end
(38) to obtain
aircraft serial 18800832 clean metal parts of the approximately 8.65 inches between center of ball
induction
airbox with Stoddard
solvent
or
socket
and center of
rod end.
equivalent. Inspect
for cracks. dents. loose rivets.
e Connect ball joint
(43) to ball on arm assembly
etc. Minor cracks
may be stop-drilled.
In case of (44) and
tighten jam nuts.
11A-18
Revision
1