CAPT and F/O Pedals Stiffness

TASK 27-20-00-810-801-A
CAPT and F/O Pedals Stiffness

WARNING: MAKE SURE THAT THE GROUND SAFETY-LOCKS ARE IN POSITION ON THE LANDING GEAR. MOVEMENT OF THE LANDING GEAR CAN CAUSE INJURY TO PERSONS AND DAMAGE TO THE AIRCRAFT AND/OR EQUIPMENT.

WARNING: MAKE SURE THAT THE CONTROLS AGREE WITH THE POSITION OF THE ITEMS THEY OPERATE BEFORE YOU PRESSURIZE A HYDRAULIC SYSTEM. UNWANTED MOVEMENT OF HYDRAULICALLY OPERATED ITEMS CAN CAUSE SERIOUS INJURY AND/OR DAMAGE.

WARNING: MAKE SURE THAT THE TRAVEL RANGES OF THE FLIGHT CONTROL SURFACES ARE CLEAR BEFORE YOU PRESSURIZE/DEPRESSURIZE A HYDRAULIC SYSTEM.

WARNING: PUT THE SAFETY DEVICES AND THE WARNING NOTICES IN POSITION BEFORE YOU START A TASK ON OR NEAR:

THE FLIGHT CONTROLS
THE FLIGHT CONTROL SURFACES
THE LANDING GEAR AND THE RELATED DOORS
COMPONENTS THAT MOVE.

MOVEMENT OF COMPONENTS CAN KILL OR CAUSE INJURY TO PERSONS AND/OR CAN CAUSE DAMAGE TO THE EQUIPMENT.

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 27-21-00-210-002	Detailed Inspection of the Rudder Mechanical Control-Cables
AMM 27-21-00-210-003	Detailed Inspection of the Rudder Mechanical Control-Linkage in the Vertical Stabilizer
AMM 27-21-00-710-001	Operational Test of the Centering Spring Rod
AMM 27-21-00-820-002	Adjustment of the Rudder Control-Cables Length
AMM 27-21-42-000-001	Removal of the CAPT Pedals
AMM 27-21-42-000-002	Removal of the F/O Pedals
AMM 27-21-42-400-001	Installation of the CAPT Pedals
AMM 27-21-42-400-002	Installation of the F/O Pedals
AMM 27-21-48-000-001	Removal of the Centering Rod of the Rudder Control
AMM 27-21-48-400-001	Installation of the Centering Rod of the Rudder Control
AMM 27-23-00-710-001	Operational Test of the Rudder Artificial-Feel Loads with Tool (355M03200001)
AMM 27-23-41-000-001	Removal of the Artificial Feel and Trim Unit
AMM 27-23-41-400-001	Installation of the Artificial Feel and Trim Unit
AMM 27-23-51-000-001	Removal of the Rudder Travel Limitation Unit
AMM 27-23-51-400-001	Installation of the Rudder Travel-Limitation Unit
AMM 27-26-17-000-001	Removal of the Yaw Damper Position Transducer Unit
AMM 27-26-17-400-001	Installation of the Yaw Damper Position Transducer Unit
AMM 27-26-41-000-001	Removal of the Centering Spring Rod for the Actuator of the Yaw Damper Servo
AMM 27-26-41-400-001	Installation of the Centering Spring Rod for the Actuator of the Yaw Damper Servo
AMM 27-26-51-000-001	Removal of the Yaw Damper Servo Actuator
AMM 27-26-51-400-001	Installation of the Yaw Damper Servo Actuator
AMM 53-59-00-210-001	Operational Check of Single Drain Pipe Aft of FR70 from Outside
Pedals and Cables Linkage
Linkage of Trim Actuator, Yaw Damper, Servo Actuator, Solenoid
Linkage of the Centering Spring Rod, TLU, Servo Controls

3. Fault Confirmation
Subtask 27-20-00-710-050-A

A. Test
(1) Do the operational test of the rudder artificial-feel loads AMM 27-23-00-710-001.

4. Fault Isolation

WARNING: MAKE SURE THAT THE FAC'S ARE ELECTRICALLY ISOLATED DURING WORK ON THE MECANICAL CONTROL SYSTEM OF THE RUDDER. IF NOT, PARTS CAN MOVE AND CAUSE INJURY AND/OR DAMAGE.

Subtask 27-20-00-865-050-A

A. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
49VU	AUTO FLT/FAC1/28VDC	5CC1	B04
49VU	AUTO FLT/FAC1/26VAC	14CC1	B03
121VU	AUTO FLT/FAC2/28VDC	5CC2	M19
121VU	AUTO FLT/FAC2/26VAC	14CC2	M18

Subtask 27-20-00-810-050-A

B. If you find a hard spot:

make sure that there is no water or ice in the lower area of the tail cone.
if you find water or ice, remove it and check that the drain tube is not clogged AMM 53-59-00-210-001.

(1) If you find a hard spot:

do a check of the pedals and cable linkage.
Pedals and Cables Linkage
disconnect the lower point of the rod (3) between the cable quadrant and the differential mechanism.
move the rudder pedals.

(2) If you find a hard spot:

disconnect the ajustable bellcrank rod (2)
move the rudder pedals.

(a) If you do not find a hard spot:

connect the rod (2) and see Para. (c)

(b) If you find a hard spot:

disconnect the link rod (1) between the CAPT and F/O pedals

1 move the CAPT pedals:
a If you do not find a hard spot:
. do a check to find the mechanical part failure at the F/O pedals and do the corrective action AMM 27-21-42-000-002 and AMM 27-21-42-400-002.
b If you find a hard spot:
. do a check to find the mechanical part failure at the CAPT pedals and do the corrective action AMM 27-21-42-000-001 and AMM 27-21-42-400-001.
2 Connect the rod (3).
(c) If the fault continues:

do a visual inspection of the tension regulator, rudder control cables and pulleys (5)
make sure for each equipment that the cables are correctly installed in the pulley grooves and on the tension regulator.
make sure that the position indicator is in the correct adjustment range on the tension regulator. Refer to the Adjustment Graph (Ref. fig. 508) in the adjustment of the linkage assembly procedure AMM 27-21-00-820-002.

1 If the position indicator is in the correct adjustment range on the tension regulator:

connect the rod (3) and see Para. (d)

2 If the position indication is not in the correct adjustment range on the tension regulator:

make an adjustment of the linkage assembly AMM 27-21-00-820-002.

(d) If the fault continues:

do a visual inspection of the cable quadrant and pulleys (4)
make sure for each equipment that the cables are correctly installed in the pulley grooves and on the cable quadrant.
make sure that the rigging and the dimension are corrects. Refer to the Detail C of the component location (Ref. fig. 507) in the adjustment of the linkage assembly procedure AMM 27-21-00-820-002.

1 If the rigging and the dimension are corrects on the cable quadrant:

do a visual inspection of the rudder mechanical control, AMM 27-21-00-210-002
connect the rod (3).

2 If the rigging and the dimension are not corrects on the cable quadrant:

do a check of the mechanical part failure and do the corrective action.
do the ajustment of the cable linkage assembly AMM 27-21-00-820-002.
connect the rod (3).

(3) If you do not find a hard spot:

connect the rod (3)
Linkage of Trim Actuator, Yaw Damper, Servo Actuator, Solenoid
do the check of the linkage of the trim actuator, yaw damper servo actuator, solenoid
disconnect the rod (6) between the control channel (trim actuator, yaw damper servo actuator) and the transmission linkage (servocontrols)
move the rudder pedals.

(a) If you find a hard spot:

disconnect the rod (7)
move the rudder pedals:

1 If you do not find a hard spot:

disconnect the yaw-damper return spring rod (9) AMM 27-26-41-000-001
manually make sure that there is no jamming of the bellcrank (8).

a If you do not find a hard spot:

change the yaw-damper return spring rod, AMM 27-26-41-400-001 and connect the rod (7) and the rod (6).

b If you find a hard spot:

disconnect and do a check of the yaw damper servo actuator, AMM 27-26-51-000-001 and AMM 27-26-51-400-001 or of the rod (4) of the transducer, AMM 27-26-17-000-001. Do a corrective action and connect the rod AMM 27-26-17-400-001.

2 If you find a hard spot:

connect the rod (7)
disconnect the rod (3) and make sure that the bellcrank (10) moves manually.

a If you do not find a hard spot:

do a check of the rod (3) and do the corrective action.

b If you find a hard spot:

disconnect the artificial-feel spring rod AMM 27-23-41-000-001
make sure that the bellcrank (11) moves manually
do a trouble shooting of the assembly, artificial spring rod, solenoid, trim screwjack, and trim actuator. Do the corrective action or replace the defective system and connect the rods AMM 27-23-41-400-001.

(b) If you do not find a hard spot:

do a check of the linkage of the centering spring rod, travel limitation unit, servocontrols
Linkage of the Centering Spring Rod, TLU, Servo Controls
do an operational test of the centering spring rod (12), AMM 27-21-00-710-001.

1 If you do not find a hard spot:

do a detailed visual inspection of the rudder mechanical control linkage in the vertical stabilizer, AMM 27-21-00-210-003 and do the corrective action if necessary.
do the check of the rod (6) and its attachment, connect the rod (6).

2 If you find a hard spot:

disconnect the centering spring rod (12) from the bellcrank (13) and examine the rod, AMM 27-21-48-000-001
from the rod (6) move the linkage.

a If you do not find a hard spot:

replace the centering spring rod (12), AMM 27-21-48-400-001 and connect the rod (6).

b If you find a hard spot:

connect the centering spring rod (12), disconnect the rods (14) and (15). Make sure that the bellcrank (13) is correct and connect the rod (14) only.

do a mechanical test of the travel limitation unit
make sure that the rods (15) and (6) are disconnected
disconnect the rod (16) from the travel limitation unit
manually pull the lever of the travel limitation unit and make sure that the travel limitation unit moves correctly under the centering rod action.

1 If you find a hard spot:

examine the travel limitation unit and replace it if necessary, AMM 27-23-51-000-001 AMM 27-23-51-400-001 and connect all the rods (15), (16) and (6).

2 If you do not find a hard spot:

do a mechanical test of the linkage
make sure that the rods (15), (16) and (6) are disconnected
disconnect the actuating spring rod of the servocontrols (17), (18) and (19)
manually make sure that the linkage bellcranks (20), (21), (22) and rods move easily.

a If you do not find a hard spot:

examine each actuating spring rod and attachment. Do the corrective action if necessary and connect all the items and rods.

b If you find a hard spot:

do a check of the defective items, do the corrective action and connect all the items and rods.

Subtask 27-20-00-710-051-A

C. Do the test given in Para.3.

[Rev.8 from Aug 2018] 2026.04.04 04:39:11 UTC