Cessna T188C - Page 264

MODEL
188 &
T188 SERIES
SERVICE MANUAL
13-4. TROUBLE
SHOOTING.
TROUBLE
PROBABLE
CAUSE
REMEDY
FAILURE TO CHANGE PITCH. Governor control disconnected or Connect or replace control.
broken.
Governor not correct for Replace governor.
propeller.
(Sensing
wrong.)
Defective governor. Replace governor.
Defective
pitch changing
mechanism Propeller
repair or replacement
inside propeller or excessive is required.
propeller
blade friction.
FAILURE TO CHANGE PITCH Improper rigging of governor Check that governor control arm
FULLY.
control.
and control have
full travel.
Rig
control
and arm as
required.
Defective
governor.
Replace
governor.
SLUGGISH RESPONSE TO
Excessive friction in
pitch Propeller repair
or replacement
PROPELLER CONTROL. changing mechanism inside is required.
propeller
or excessive
blade
friction.
Perform
static
RPM check
STATIC RPM
TOO HIGH
OR Improper
propeller
governor
Refer to
section 11 for
TOO
LOW.
adjustments.
procedures.
ENGINE
SPEED
WILL
NOT
Sludge in
governor.
Remove
and
clean.
STABILIZE.
Air
trapped
in
propeller
Trapped
air
should
be purged
actuating
cylinder.
by exercising
the propeller
several
times
prior
to take-off
after
propeller
has been
re-
Installed
or has
been idle
for
an
extended
period.
Excessive
friction
in pitch
Propeller
repair
or replacement
changing
mechanism
inside
is
required.
propeller
or excessive
blade
friction.
Defective
governor.
Replace
governor.
OIL LEAKAGE
AT PROPELLER
Damaged
0-ring
seal between
Remove
propeller
and install
MOUNTING
FLANGE,
engine
crankshaft
flange
and
o-ring
seal.
propeller.
Foreign
material
between
Remove
propeller
and
clean
engine
crankshaft
flange
and
mating
surfaces;
install
new
propeller
mating
surfaces
or
O-ring
and
tighten
mounting
mounting
nuts
not tight.
nuts
evenly
to torque
value
in figure 13-2.
OIL LEAKAGE
AT ANY
Defective
seals, gaskets,
Propeller
repair or
replacement
OTHER
PLACE,
threads,
etc., or incorrect
is required.
assembly.
13-2