Check of the Correct Tension of the THS Mechanical Control Cables

TASK 27-41-00-220-002-A
Check of the Correct Tension of the THS Mechanical Control Cables

WARNING: MAKE SURE THAT THE GROUND SAFETY-LOCKS ARE IN POSITION ON THE LANDING GEAR. THIS WILL PREVENT UNWANTED MOVEMENT OF THE LANDING GEAR, AND THUS POSSIBLE 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 CONTROLS SURFACES ARE CLEAR. MOVEMENT OF FLIGHT CONTROLS CAN CAUSE INJURY TO PERSONS AND/OR DAMAGE TO EQUIPMENT.

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.

ZONE: 130
ZONE: 150

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

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE
No specific	AR	CABLE TENSIOMETER
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
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
131MC, 151FC
131BC, 151BC

C. Referenced Information

REFERENCE	DESIGNATION
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 25-54-12-000-002-A	Removal of the Ceiling Panels in the Forward Cargo Compartment
TASK 25-54-12-400-002-A	Installation of the Ceiling Panels in the Forward Cargo Compartment
TASK 25-55-11-000-002-A	Removal of the Ceiling Panels in the Aft Cargo-Compartment - FR47/FR59
TASK 25-55-11-400-002-A	Installation of the Ceiling Panels in the Aft Cargo-Compartment - FR47/FR59
TASK 27-41-00-820-002-A	Adjustment of the THS Control-Cables Length
TASK 27-41-42-000-001-A	Removal of the Cable Tension Regulator
TASK 27-41-42-400-001-A	Installation of the Cable Tension Regulator
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 29-24-00-863-001-A	Pressurize the Yellow Hydraulic System with the Electric Pump
TASK 52-30-00-860-001-A	Open the FWD or Aft Cargo-Compartment Door with the Yellow Electric Pump
TASK 52-30-00-860-002-A	Close the FWD or Aft Cargo-Compartment Door with the Yellow Electric Pump

3. Job Set-up
Subtask 27-41-00-860-060-A

A. Aircraft Maintenance Configuration
(1) Energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-861-002).
(2) Pressurize the Green and Yellow hydraulic systems with the electric pump (Ref. AMM TASK 29-24-00-863-001) (Ref. AMM TASK 29-23-00-863-001).
(3) Safety Precautions
(a) On the center pedestal, make sure that the pitch-trim control-wheels are set to zero.
(b) Put a WARNING NOTICE(S) on the pitch-trim control wheels to tell persons not to use the pitch trim.
(c) Put a WARNING NOTICE(S) on the rudder pedals (CAPT and F/O) to tell persons not to operate them.

Subtask 27-41-00-010-052-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Open the FWD and AFT cargo compartment doors (Ref. AMM TASK 52-30-00-860-001).
(2) Put the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position.
(3) Remove the ceiling panel 131BC in the cargo compartment (Ref. AMM TASK 25-54-12-000-002).
(4) Remove the ceiling panel 151BC in the cargo compartment (Ref. AMM TASK 25-55-11-000-002).

Subtask 27-41-00-010-052-B ** ON A/C NOT FOR ALL

B. Get Access
(1) Open the FWD and AFT cargo compartment doors (Ref. AMM TASK 52-30-00-860-001).
(2) Put the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position.
(3) Remove the ceiling panel 131MC in the cargo compartment (Ref. AMM TASK 25-54-12-000-002).
(4) Remove the ceiling panel 151FC in the cargo compartment (Ref. AMM TASK 25-55-11-000-002).

4. Procedure
Subtask 27-41-00-220-051-A

A. Check of the Correct Tension of the THS Mechanical Control Cables
(1) Operate the THS fully five times and put it in the zero position.
(2) In the cargo compartment, you can see four cables:

the two cables at right are the THS control cables
the two cables at left are the rudder control cables.

(3) Make sure that the movable pulley bracket of the tension regulator is not on a stop.
(4) Bend the two THS cables at right to the same value and release them quickly. When you release the cables, make sure that the movable pulley bracket of the tension regulator moves easily (it must not be caught).
(5) With a CABLE TENSIOMETER, measure the tension of each cable, in each cargo compartment, between two static fairleads.
Repeat this operation twice to valid the measurement.

NOTE: The tension value of each cable is 20 +8 -4 daN (45 +18 -9 lbf).

(6) If the result of the check is not correct, change the springs of the cable tension regulator (Ref. AMM TASK 27-41-42-000-001), (Ref. AMM TASK 27-41-42-400-001). Adjust the cables (Ref. AMM TASK 27-41-00-820-002).

5. Close-up
Subtask 27-41-00-410-052-A ** ON A/C NOT FOR ALL

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Install the ceiling panel 131BC in the cargo compartment (Ref. AMM TASK 25-54-12-400-002).
(3) Install the ceiling panel 151BC in the cargo compartment (Ref. AMM TASK 25-55-11-400-002).
(4) Close the FWD and AFT cargo compartment doors (Ref. AMM TASK 52-30-00-860-002).
(5) Remove the warning notices
(6) Remove the access platform(s).

Subtask 27-41-00-410-052-B ** ON A/C NOT FOR ALL

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Install the ceiling panel 131MC in the cargo compartment (Ref. AMM TASK 25-54-12-400-002).
(3) Install the ceiling panel 151FC in the cargo compartment (Ref. AMM TASK 25-55-11-400-002).
(4) Close the FWD and AFT cargo compartment doors (Ref. AMM TASK 52-30-00-860-002).
(5) Remove the warning notices
(6) Remove the access platform(s).

Subtask 27-41-00-860-061-A

B. Put the aircraft back to its initial configuration.
(1) Depressurize the Green and Yellow hydraulic system (Ref. AMM TASK 29-23-00-864-001).
(2) De-energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-862-002).

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