Shortening of the Rudder Control Cable

TASK 27-21-00-820-004-A
Shortening of the Rudder Control Cable

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.

WARNING: MAKE SURE THAT THE TRAVEL RANGES OF THE FLIGHT CONTROLS SURFACES ARE CLEAR. MOVEMENT OF FLIGHT CONTROLS CAN CAUSE INJURY TO PERSONS AND/OR DAMAGE TO EQUIPMENT.

CAUTION: MAKE SURE THAT THE AIRCRAFT IS IN THE TEMPERATURE CONDITIONS (STABLE AMBIENT TEMPERATURE) SPECIFIED IN THE AIRCRAFT MAINTENANCE CONFIGURATION PARAGRAPH. CHANGES IN THE TEMPERATURE CAN CAUSE INCORRECT MEASUREMENTS.

ZONE: 120
ZONE: 130
ZONE: 131
ZONE: 132
ZONE: 150
ZONE: 210
ZONE: 240
ZONE: 310

1. Reason for the Job
Do this procedure when it is no longer possible to adjust the length of the rudder control cables (turnbuckles on the stops).
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE
No specific	AR	THERMOMETER
No specific	AR	WARNING NOTICE(S)
98A27901002000	1	PIN-RIGGING,RUDDER CONTROL
98D27207547000	1	PIN-RIGGING
98F27003500000	1	LOCKING TOOL - CABLE

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
120	AVIONICS COMPARTMENT
130	FWD CARGO COMPT AFT BULKHEAD OF AVNCS COMPT TO FWD PRESSURE BULKHEAD OF WING CENTER BOX
131	FORWARD CARGO COMPARTMENT
132	FORWARD CARGO COMPARTMENT
150	AFT CARGO COMPARTMENT FWD PRESS BULKHEAD TO AFT BULKHEAD OF AFT CARGO COMPARTMENT
210	CKPT,FWD COMPT BHD TO FLT COMPT BULKHEAD
240	MID PASSENGER COMPARTMENT
310	FUSLG TAIL SECTION AFT OF AFT PRESS BHD
312AR, 825, 826

C. Referenced Information

REFERENCE	DESIGNATION
TASK 12-33-21-618-001-A	Pre-conditioning through the LP Ground Connection (Aircraft Electrical Power Available)
TASK 12-33-21-618-001-A-01	Pre-conditioning through the HP Ground Connection
TASK 12-33-21-618-001-A-02	Pre-conditioning with the APU
TASK 12-33-21-618-001-A-03	Pre-conditioning through the LP Ground Connection (Aircraft Electrical Power Not Available)
TASK 25-54-12-000-001-A	Removal of the Forward Cargo-Compartment Partition
TASK 25-54-12-400-001-A	Installation of the Forward Cargo-Compartment Partition
TASK 27-21-00-820-002-A	Adjustment of the Rudder Control-Cables Length
TASK 53-32-12-000-002-A	Removal of the Cabin Floor Panels
TASK 53-32-12-400-002-A	Installation of the Cabin Floor Panels
TASK 06-41-53-00	FUSELAGE-DESCRIPTION AND OPERATION
Component Location ** ON A/C NOT FOR ALL
Adjustment Graph
Rudder Cable Turnbuckles
Cable Travel 'Y'
Component Location ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 27-21-00-010-073-A

A. Get Access
(1) Make sure that the ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE is in position at the cargo compartment doors 825 and 826.
(2) Make sure that the cargo compartment doors 825 and 826 are open.
(3) Make sure that the ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE is in position at zone 312.
(4) Open the access door 312AR.
(5) Make sure that the panels are removed :

NOTE: Refer to AMM chapter 06 for panels details (Ref. AMM D/O 06-41-53-00).

(a) In the zone 241:
1 Make sure that the floor panels between FR35 and FR42 are removed (Ref. AMM TASK 53-32-12-000-002).
(b) In the zone 131:
1 Make sure that the forward cargo-compartment partition FR34 is removed (Ref. AMM TASK 25-54-12-000-001).

Subtask 27-21-00-860-067-A

B. Aircraft Maintenance Configuration
(1) Make sure that the air conditioning system does not operate (Ref. AMM TASK 12-33-21-618-001).
(2) Make sure that there is no neon light on near the cable, in the cable routing zone.
(3) Let the temperature in the aircraft become stable for a period of three hours before you start the adjustment.

NOTE: You can do other maintenance actions during the three hour period if they do not change the ambient temperature (no source of heat or cold, aircraft not energized, no air conditioning, no neon light sources in the cable routing area).

(4) Make sure that the rudder trim and the rudder pedals are in the '0' position.
(5) Put a WARNING NOTICE(S) in position in the cockpit to tell persons not to operate the rudder pedals and the rudder trim.
(6) Make sure that the 98D27207547000 PIN-RIGGING (9) is in position on the cable quadrant (6).
(7) Make sure that the 98A27901002000 PIN-RIGGING,RUDDER CONTROL (4) is in position on the tension regulator (1).

4. Procedure
Subtask 27-21-00-220-052-A

A. Measurement
(1) Measure the cable zone temperature and the external temperature with a THERMOMETER. Make sure that the temperature is the same at plus or minus 2 Deg.C (plus or minus 3.60 Deg.F).

Subtask 27-21-00-820-061-A

B. Shortening of the Rudder Control Cables
(1) Adjust the two turnbuckles to the dimension 'C' = 30 mm (1.18 in.).
(2) Find the correct value to cut the cables.
(a) Use the adjustment graph to find the position of the index of the tension regulator (1) in relation to the ambient temperature.
(b) Put marks on the two cables where the cable routing is straight and near the structure.
(c) In the fuselage between two static fairleads, pull the two cables at the same time until the index of the tension regulator is at the position found on the graph.

NOTE: Pull the cables down to get the necessary force and measure the cable travel 'Y' along the aircraft axis.

(d) Measure with the marks (on the cables and on the structure) the cable travel 'Y' on each cable to get the necessary cable length.
(e) For each cable side, subtract 45 mm (1.7717 in.) from the value measured before.

NOTE: 45 mm (1.7717 in.) is the cable penetration into the terminal stud of one turnbuckle.

(f) The value 'X' (to cut the cable) = 'Y' (cable travel) - 45 mm (1.7717 in.).

-------------------------------------------------------------------------------

! Example: !

! Measured cable travel 'Y' for each cable = 110 mm (4.33 in.) !

! Cable penetration into the terminal stud = 45 mm (1.77 in.) !

! Value 'X' to cut the cable = 110 mm - 45 mm = 65 mm !

! (4.33 in. - 1.77 in. = 2.55 in.) !

!-----------------------------------------------------------------------------!

! Cut the two rear cables by 65 mm (2.55 in.) !

-------------------------------------------------------------------------------

(3) Use the measured clearance between the turnbuckles and the static fairleads to cut the rear cable junction by the calculated value.
(a) Cut the two rear cables by the same value.
(b) Do not disconnect the two rear cables at the same time.
(c) Cut the first rear cable as follows.
1 Disconnect the cable.

Remove the locking clips (3) from the turnbuckle (2).
Turn the turnbuckle to remove the cable.

Remove the locking clips (3) from the turnbuckle (2).
Turn the turnbuckle to remove the rear cable.

2 Cut the cable.
3 Install a new terminal stud on the cable (CFM Cable Fabrication Man).
4 Install the 98F27003500000 LOCKING TOOL - CABLE to connect the rear cable to the forward cable with the turnbuckle.
5 Lightly tighten the turnbuckle.
6 Remove the 98F27003500000 LOCKING TOOL - CABLE.
(4) Remove the 98D27207547000 PIN-RIGGING (9) from the cable quadrant (6).
(5) Remove the 98A27901002000 PIN-RIGGING,RUDDER CONTROL (4) from the tension regulator (1).
(6) Remove the WARNING NOTICE(S).
(7) Do the adjustment of the rudder control-cable length (Ref. AMM TASK 27-21-00-820-002).
(8) Make sure that the clearances 'A' between the ends of the terminal studs (cable side) and the fairleads are minimum of 25.4 mm (1.00 in.) along the full travel range of the rudder control.
(9) Make sure that the distance 'B' between the ends of the terminal studs (cable side) in each rudder control cable is a minimum of 90 mm (3.54 in.) along the full travel range of the rudder control.
(10) Make sure that the turnbuckles are in the adjustment range of 38.2 mm (1.50 in.).

5. Close-up
Subtask 27-21-00-860-082-A

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Install the access door 312AR.
(3) Install the panels that follow:

NOTE: Refer to AMM chapter 06 for panels details (Ref. AMM D/O 06-41-53-00).

(a) In the zone 241:
1 Install the floor panels between FR35 and FR42 (Ref. AMM TASK 53-32-12-400-002).
(b) In the zone 131:
1 Install the forward cargo-compartment partition FR34 (Ref. AMM TASK 25-54-12-400-001).

[Rev.10 from 2021] 2026.03.31 23:47:57 UTC