Adjustment of the THS Control-Cables Length

TASK 27-41-00-820-002-A
Adjustment of the THS Control-Cables Length

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: 150
ZONE: 240
ZONE: 310

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE
No specific	AR	ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE
No specific	AR	CABLE TENSIOMETER
No specific	AR	THERMOMETER
No specific	AR	WARNING NOTICE(S)
0U190360	1	PIN-RIGGING,THS ACTUATOR,MECHANICAL INPUT LEVER
98D27403500000	1	PITCH TRIM CONTROL LOCKING

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
150	AFT CARGO COMPARTMENT FWD PRESS BULKHEAD TO AFT BULKHEAD OF AFT CARGO COMPARTMENT
240	MID PASSENGER COMPARTMENT
310	FUSLG TAIL SECTION AFT OF AFT PRESS BHD
312AR, 811, 812

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 21-21-41-000-001-A	Removal of the Recirculation Filter Cartridge
TASK 21-21-41-400-001-A	Installation of the Recirculation Filter Cartridge
TASK 21-21-45-000-001-A	Removal of the Recirculation Filter Housing
TASK 21-21-45-400-001-A	Installation of the Recirculation Filter Housing
TASK 24-41-00-861-002-A	Energize the Aircraft Electrical Circuits from the External Power
TASK 24-41-00-861-002-A-01	Energize the Aircraft Electrical Circuits from the APU
TASK 24-41-00-861-002-A-02	Energize the Aircraft Electrical Circuits from Engine 1(2)
TASK 24-41-00-862-002-A	De-energize the Aircraft Electrical Circuits Supplied from the External Power
TASK 24-41-00-862-002-A-01	De-energize the Aircraft Electrical Circuits Supplied from the APU
TASK 24-41-00-862-002-A-02	De-energize the Aircraft Electrical Circuits Supplied from the Engine 1(2)
TASK 25-54-12-000-001-A	Removal of the Forward Cargo-Compartment Partition
TASK 25-54-12-000-002-A	Removal of the Ceiling Panels in the Forward Cargo Compartment
TASK 25-54-12-400-001-A	Installation of the Forward Cargo-Compartment Partition
TASK 25-54-12-400-002-A	Installation of the Ceiling Panels in the Forward Cargo Compartment
TASK 27-41-00-820-003-A	Shortening of the THS Control Cable
TASK 27-41-44-000-001-A	Removal of the THS Control Cables
TASK 27-41-44-400-001-A	Installation of the THS Control Cables
TASK 29-23-00-863-001-A	Pressurize the Green Hydraulic System from the Yellow Hydraulic System through the PTU with the Electric Pump
TASK 29-23-00-864-001-A	Depressurize the Green and Yellow Hydraulic Systems after Operation of the PTU
TASK 31-60-00-860-001-A	EIS Start Procedure
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
Component Location ** ON A/C NOT FOR ALL
Adjustment Graph
Adjustment of the Cables

3. Job Set-up
Subtask 27-41-00-860-071-A

A. Aircraft Maintenance Configuration
(1) Make sure that the aircraft electrical circuits are de-energized
(Ref. AMM TASK 24-41-00-862-002).
(2) Make sure that the air conditioning does not operate (Ref. AMM TASK 12-33-21-618-001).
(3) Make sure that there is no neon light on, near of the cable, in the cable routing zone.
(4) 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).

(5) If installed, remove:

The 0U190360 PIN-RIGGING,THS ACTUATOR,MECHANICAL INPUT LEVER (10) from the mechanical input of the THS actuator (12)
The 98D27407532000 RIGGING PIN - THS MECHANICAL CONTROL (11) from the rocker assembly of the cable tension regulator (13)
The 98D27403500000 PITCH TRIM CONTROL LOCKING.

(6) Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).
(7) Do the Electronic Instrument System (EIS) start procedure (Ref. AMM TASK 31-60-00-860-001).
(8) Pressurize the Green and the Yellow hydraulic systems (Ref. AMM TASK 29-23-00-863-001).
(9) Operate the THS fully more than ten times and put it in the zero position.
(10) On the center pedestal, make sure that the pitch-trim control-wheels are set to zero.
(11) Depressurize the Green and the Yellow hydraulic systems (Ref. AMM TASK 29-23-00-864-001).
(12) Lock the pitch-trim control wheel with the 98D27403500000 PITCH TRIM CONTROL LOCKING to prevent movement of the THS.
(13) Put a WARNING NOTICE(S) on the pitch-trim control wheels to tell persons not to use the pitch trim.
(14) Put the WARNING NOTICE(S) in position to tell persons not to pressurize the Yellow and the Green hydraulic systems:

on the overhead panel, on the HYD section of HYD/FUEL panel 40VU
on the ground service panel of the Green and Yellow hydraulic systems.

(15) Install the 0U190360 PIN-RIGGING,THS ACTUATOR,MECHANICAL INPUT LEVER (10) on the mechanical input of the THS actuator (12).
(16) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).

Subtask 27-41-00-010-068-A ** ON A/C NOT FOR ALL

Subtask 27-41-00-010-068-B ** ON A/C NOT FOR ALL

B. Get Access
(1) Put the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position below access door 811.
(2) Open access door 811.
(3) Put the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position below access door 812.
(4) Open access door 812.
(5) Put the ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE in position below access door 312AR.
(6) Open access door 312AR.
(7) Get access to the turnbuckles of the Trimmable Horizontal Stabilizer (THS) actuator cables.
(a) Refer to the aircraft configuration during the maintenance phase. There are two possibilities to get access to the turnbuckles of the THS actuator cables. You can use the more applicable procedure that follows:
1 In zones 231 and 241, remove the applicable cabin floor panels between FR35 and FR42 (Ref. AMM TASK 53-32-12-000-002) and (Ref. AMM D/O 06-41-53-00), or
2 In zone 131, in the forward cargo compartment:
a If the Additional Center Tank (ACT) No.4.1 (ACT FWD) is installed, remove it (Ref. AMM D/O 28-11-27-00).
b Remove the applicable ceiling panel between FR35.2 and FR35.5 (Ref. AMM TASK 25-54-12-000-002) and (Ref. AMM D/O 06-41-53-00).
c Remove the applicable partition panels at FR35.5 (Ref. AMM TASK 25-54-12-000-001) and (Ref. AMM D/O 06-41-53-00).
d Remove the recirculation filter cartridge, LH side (Ref. AMM TASK 21-21-41-000-001).
e Remove the recirculation filter housing, LH side (Ref. AMM TASK 21-21-45-000-001).

Subtask 27-41-00-862-054-A

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Subtask 27-41-00-010-067-A

DELETED

Subtask 27-41-00-010-067-B

DELETED

Subtask 27-41-00-860-053-A

DELETED

4. Procedure
Subtask 27-41-00-820-052-A

A. Adjustment of the THS Control Cables
(1) Measure the ambient temperature with the THERMOMETER.
(2) Use the adjustment graph to find the position of the index (4) of the tension regulator (13) in relation to the measured ambient temperature.
(3) Bend the two cables to the same value and release them quickly.
(a) When you release the cables, make sure that the movable pulley bracket of the tension regulator (13) moves easily (it must not be caught).
(4) Remove the locking clips from the turnbuckles.
(5) Turn the two turnbuckles by the same value to adjust the tension of the cable loop until:

The position of the index (4) of the tension regulator (13) agrees with the values found on the graph with a tolerance of plus or minus one graduation (+ or - 5 deg.C (41 deg.F)).
You can install the locking clips on the turnbuckles.
The pitch-trim control-wheels stay at zero.

(6) If you cannot adjust the control cables, do a visual inspection of the pulleys and the tension regulator (13).
(a) If they are in good condition:
1 Make a mark on each rear cable.
2 Pull the cables to the front until the position of the index agrees with the value found on the graph.
3 Keep the cables pulled and make a new mark on each cable then release the cables.
4 Measure the length between two marks of each cable:

If the length is more than 32 mm (1.2598 in.), decrease the length of the control cables (Ref. AMM TASK 27-41-00-820-003).
If the length is less than 32 mm (1.2598 in.), replace the rear control cables (Ref. AMM TASK 27-41-44-000-001) and (Ref. AMM TASK 27-41-44-400-001).

(7) Remove the 0U190360 PIN-RIGGING,THS ACTUATOR,MECHANICAL INPUT LEVER (10).
(8) Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).
(9) Pressurize the Green and the Yellow hydraulic systems (Ref. AMM TASK 29-23-00-863-001).
(10) Operate the THS fully more than ten times and put it in the zero position.
(11) Depressurize the Green and the Yellow hydraulic systems (Ref. AMM TASK 29-23-00-864-001).
(12) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).
(13) Install the 0U190360 PIN-RIGGING,THS ACTUATOR,MECHANICAL INPUT LEVER (10).
(14) Make sure that the position of the index (4) agrees with the values found on the graph with a tolerance of plus or minus one graduation (+ or - 5 deg.C (41 deg.F)).
(15) Make sure that the pitch-trim control-wheels stay at zero.
(16) With the CABLE TENSIOMETER, measure the tension of the two cables at a distance no less than 200 mm (7.8740 in.) from the tension regulator (13).
(a) Do this step two times to make sure that you get the same tension value.
(17) Make sure that the tension value is 20 -4 m.daN or +20 m.daN (147 -29 lbf.ft or +147 lbf.ft).
(18) Install the locking clips on the turnbuckles of each cable.
(a) Make sure that the number of threads on each side of the end fitting is the same.

5. Close-up
Subtask 27-41-00-860-057-A

A. Put the aircraft back to its initial configuration.
(1) Remove the 0U190360 PIN-RIGGING,THS ACTUATOR,MECHANICAL INPUT LEVER (10).
(2) Remove the WARNING NOTICE(S).
(3) Make sure that the work area is clean and clear of tools and other items.

Subtask 27-41-00-410-060-A ** ON A/C NOT FOR ALL

B. Close Access
(1) In zone 241, install the applicable cabin floor panels between FR35 and FR42 (Ref. AMM TASK 53-32-12-400-002) and (Ref. AMM D/O 06-41-53-00).
(2) Close access doors 811 and 312AR.
(3) Remove the access platform(s).
(4) Remove the WARNING NOTICE(S).

Subtask 27-41-00-410-060-B ** ON A/C NOT FOR ALL

B. Close Access
(1) Refer to the aircraft configuration during the maintenance phase. There are two possibilities to close access to the turnbuckles of the THS actuator cables. You can use the more applicable procedure that follow:
(a) In zones 231 and 241, install the applicable cabin floor panels between FR35 and FR42 (Ref. AMM TASK 53-32-12-400-002) and (Ref. AMM D/O 06-41-53-00), or
(b) In zone 131, in the forward cargo compartment:
1 Install the recirculation filter housing, LH side (Ref. AMM TASK 21-21-45-400-001).
2 Install the recirculation filter cartridge, LH side (Ref. AMM TASK 21-21-41-400-001).
3 Install the applicable partition panels at FR35.5 (Ref. AMM TASK 25-54-12-400-001) and (Ref. AMM D/O 06-41-53-00).
4 Install the applicable ceiling panel between FR35.2 and FR35.5 (Ref. AMM TASK 25-54-12-400-002) and (Ref. AMM D/O 06-41-53-00).
5 If the ACT No.4.1 (ACT FWD) was removed, install it (Ref. AMM D/O 28-11-27-40).
(2) Close access doors 811 and 312AR.
(3) Remove the access platform(s).
(4) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.03.31 23:50:43 UTC