Functional Test of the THS-Actuator Overtravel Related to the Mechanical Indicator

TASK 27-41-00-720-001-A
Functional Test of the THS-Actuator Overtravel Related to the Mechanical Indicator

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 FLIGHT CONTROL SAFETY-LOCKS AND THE WARNING NOTICES ARE IN POSITION.

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: 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.

ZONE: 310

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
310	FUSLG TAIL SECTION AFT OF AFT PRESS BHD

B. 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 27-41-00-820-001-A	Adjustment of the THS Zero Position
TASK 27-41-00-820-002-A	Adjustment of the THS Control-Cables Length
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 29-24-00-864-001-A	Depressurize the Yellow Hydraulic System
TASK 31-60-00-860-001-A	EIS Start Procedure
TASK 31-60-00-860-002-A	EIS Stop Procedure
Lower Chain Dimension Adjustment

3. Job Set-up
Subtask 27-41-00-860-054-A

A. Aircraft Maintenance Configuration
(1) Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).
(2) Do the EIS start procedure (Ref. AMM TASK 31-60-00-860-001).
(3) Pressurize the Green and Yellow hydraulic systems (Ref. AMM TASK 29-23-00-863-001) (Ref. AMM TASK 29-24-00-863-001).
(4) On the center pedestal, on the ECAM control panel, push the F/CTL key (on the lower ECAM display unit, the F/CTL page comes into view).

Subtask 27-41-00-865-051-A

B. Make sure that this(these) circuit breaker(s) is(are) closed:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
121VU	FLIGHT CONTROLS/ELAC2/NORM/SPLY	15CE2	R20

4. Procedure
Subtask 27-41-00-720-051-A

A. Functional Test of the THS-Actuator Overtravel Related to the Mechanical Indicator

ACTION	RESULT
1.Slowly move one of the pitch-trim control wheels to the 4 deg. DN stop.	The 4 Deg DN indication on each graduated wheel is opposite the triangle on the center pedestal index. On the lower ECAM display unit, on the F/CTL page, on the PITCH TRIM indicator the value shown is included between 3.5 and 4.3 deg. The mechanical input of the THS actuator is against its stop before the pitch-trim gearset unit. At the control wheel, first you must feel the THS actuator stop then you must put more force (cable elasticity), finally you get the pitch-trim gearset unit stop. On the lower ECAM display unit, on the F/CTL page, on the PITCH TRIM indicator: make sure that the value shown is included between 3.5 and 4.3 deg. In the zone 310, the position mark of the THS is opposite the 4th upper mark on the tail cone.
2.Slowly move one of the pitch-trim control wheels to the 13.5 deg UP stop.	The 13.5 UP mark on each graduated wheel is opposite the triangle of the center pedestal index. On the lower ECAM display, on the F/CTL page, on the PITCH TRIM indicator, the value shown is included between 12.9 and 13.9 deg. You touch the stop of the THS actuator mechanical input before the stop of the pitch-trim control wheel. The stop must have almost the same flexibility as for the DN position. In the zone 310, the position mark of the THS is opposite the 13.5 th lower mark on the tail cone.
3.Move the pitch-trim control wheel to the 0 position.	On the lower ECAM display unit, on the F/CTL page, on the PITCH TRIM indicator the value shown is 0 +0.3 -0.3 deg.
4.If the values shown on the F/CTL page are not correct and if you touch the stop on the pitch-trim gearset unit before the stop of the THS actuator mechanical input, do these steps: A.Loosen the cables (Ref. AMM TASK 27-41-00-820-001)(Ref.Subtask 27-41-00-820-050). B.Remove the chain from the pinion just after the gearset unit. Lower Chain Dimension Adjustment C.Shift one tooth between the gear just after the pitch-trim gearset unit and the chain/cable to the THS. D.Install the chain on the pinion. E.Adjust the trim control wheel (Ref. AMM TASK 27-41-00-820-002). F.Adjust the tension of the cable (Ref. AMM TASK 27-41-00-820-002). G.Make sure that you touch the stop of the THS actuator mechanical input before the stop of the pitch-trim control wheel.

5. Close-up
Subtask 27-41-00-860-055-A

A. Put the aircraft back to its initial configuration.
(1) Depressurize the Green and Yellow hydraulic systems (Ref. AMM TASK 29-23-00-864-001) and (Ref. AMM TASK 29-24-00-864-001).
(2) Do the EIS stop procedure (Ref. AMM TASK 31-60-00-860-002).
(3) Make sure that the work area is clean and clear of tools and other items.
(4) Remove the access platform(s).
(5) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).

[Rev.10 from 2021] 2026.03.31 23:50:41 UTC