Cessna T188C - Page 144

MODEL 188
& T188 SERIES
SERVICE
MANUAL
SECTION 9
ELEVATOR
TRIM
TAB CONTROL
SYSTEM
Page No.
TABLE OF CONTENTS Aerofiche/Manual
ELEVATOR
TRIM TAB
Cleaning, Inspection
and
CONTROL SYSTEM ......... 1G21/9-1 Repair .......... 1G22/9-2
Description .......... 1G21/9-1 Reassembly ........ 1H1/9-5
Trouble Shooting ........ 1G21/9-1 Trim Tab Free-Play Inspection . 1H1/9-5
Trim Tab ........... 1G22/9-2 Trim Tab Control Wheel .... 1H3/9-7
Removal and Installation . . 1G22/9-2 Removal and Installation .. 1H3/9-7
Trim Tab Actuator ....... 1G22/9-2 Cables and Pulleys ....... 1H3/9-7
Removal and Installation . . 1G22/9-2 Removal and Installation .. 1H3/9-7
Disassembly ........ 1G22/9-2 Rigging .... ........ 1H3/9-7
9-1. ELEVATOR
TRIM TAB CONTROL
SYSTEM. tion of the trim
wheel operates the tab through
roller
(See figure
9-1.)
chains, cables,
an actuator and a push-pull
tube. A
position indicator, secured to the roller chain, indi-
9-2. DESCRIPTION. The elevator trim tab is lo- cates tab position on a scale. Trim tab travel is ad-
cated on the right elevator,
operated by a control
justed by stop-blocks secured
to the control cables.
wheel mounted on the left side of the cockpit. Rota-
9-3.
TROUBLE
SHOOTING.
NOTE
Due to remedy procedures in the following trouble shooting
chart, it may
be necessary to
re-rig system.
Refer to
paragraph 9-16.
TROUBLE PROBABLE CAUSE REMEDY
TRIM CONTROL
WHEEL Cable
tension too high.
Adjust cable tension.
MOVES
WITH
EXCESSIVE
RESISTANCE. Pulleys binding or rubbing. Repair or replace defective parts.
Cables not in place on Install cables correctly.
pulleys.
Trim tab hinge binding.
Lubricate or replace
hinge.
Defective actuator. Replace actuator.
Rusty chain. Replace chain.
Damaged sprocket. Replace sprocket.
Bent sprocket shaft. Replace shaft.
LOST MOTION BETWEEN Cable tension too low. Adjust cable tension.
CONTROL
WHEEL
AND
TRIM TAB.
Broken pulley.
Replace pulley.
Cables not in place on pulleys. Install cables correctly.
Worn trim tab actuator. Replace actuator.
Actuator
attachment
loose.
Tighten.
9-1