Engine Controls; Description; Rigging - Cessna 188 Series Service Manual

MODEL 188 & T188 SERIES SERVICE MANUAL
f. In the cockpit, push alternate air control full
NOTES
IN and check that alternate air door (45) is fully
closed. After completion of step "c" the alternate
g. If door (45) is NOT fully closed, loosen clamps
air control should be properly rigged.
securing control (37) to engine mount (39) and
however in some cases,
it becomes
support assembly (41) and slide control through necessary to shorten the control housing
clamps until door is fully closed. Tighten clamps, in order for the air valve (52) to reach full
h. In the cockpit. unlock alternate air control.
open.
pull control full OUT (approximately 3 inches) and
check that alternate air door (45) is fully open. The result of rigging. in all cases, is the
alternate air valve (52) must be fully
NOTE OPEN when the control in the cockpit is
pulled a maximum of 3 inches.
Also
After completion of step "h" the alternate the valve is fully CLOSED when the
air control should be properly rigged,
control is pushed in and that no binding
however, in some cases. it may become
of the system is experienced.
necessary to shorten the control housing
in order for the bellcrank (36) to reach full
11A-60. IGNITION SYSTEM.
Refer to Section 11.
travel. If so, proceed to step "".
L1A-61. ENGINE CONTROLS.
i. Loosen clamp-bolt at bellcrank (36). straighten
control wire and slide wire from clamp-bolt. 11A-62. DESCRIPTION. The throttle and propeller
j. In the cockpit. using care not to lose ball
governor control levers are in the control quadrant
bearing from the control at instrument panel.
mounted to the left of the pilot's seat. The mixture
unlock and pull control OUT until wire is out-of- control is equipped with a position locking device
sight inside housing at the engine end of control.
which prevents vibration-induced "creeping" of the
Cut the housing off as required to allow bellcrank control. The alternate air control is located on the
to attain full travel and reinstall wire in clamp- lower left side of the instrument panel. On the
bolt. Bend wire to a 90
°
angle as a safety later model aircraft, an additional "Palnut" type
precaution.
locknut was installed in back of the existing
k. Check operation of air door in both directions locknut at the engine end of all throttle and
making sure the control in the cockpit does not propeller controls that contain rod ends.
pull out more than 3 inches maximum.
NOTE
NOTES
Some controls have intricate parts that
The result of rigging, in all cases, is the
will fall out and possibly be lost if the
alternate air door (45) must be fully control is pulled from the housing while
OPEN when the control in the cockpit is the control is disconnected.
pulled out a maximum of 3 inches. that
the door is fully CLOSED when the 11A-63. RIGGING. When adjusting any engine
control is pushed in and that no binding
control. it is important to check that the control
of the system is experienced. slides smoothly throughout its full range of travel.
that it locks securely if equipped with a locking
Refer to the inspection chart in Section 2
device and that the arm or lever it operates moves
for inspection and/or replacement through its full arc of travel.
interval for the alternate air control.
11A-59. RIGGING, ALTERNATE AIR ROTARY
VALVE (BEGINNING WITH AIRCRAFT SERIAL Whenever engine controls
are being
18802860) Refer to figure 11A-6, sheet 7. disconnected, pay particular attention to
the exact position. size and number of
NOTE
attaching washers and spacers. Be sure
to install attaching parts as noted when
Cowling must be removed prior to connecting controls.
rigging of alternate air control.
11A-64. THROTTLE CONTROL.
a. In the cockpit push alternate air controls full a. (THRU AIRCRAFT SERIAL 18800832.) (See
IN and check that alternate air valve (52) is fully to figure 11A-6, sheets 1, 2 and 3.)
closed.
b. If air valve (52) is not fully closed. loosen CAUTION
locking nut (54) retaining control wire (55) to valve
arm (56) and move valve to closed position. Whenever throttle control is disconnected
Tighten nut. at the engine, pay particular attention to
c. In the cockpit. unlock alternate air control.
the EXACT position, size and number of
pull control full OUT (approximately 3 inches) and attaching bolts and washers. Be sure to
check air valve (52) is fully open.
install attaching parts as noted when
reconnecting controls.
Revision 1 11A-19