Operational Test of the Jamming Protection Device of the Trimmable Horizontal Stabilizer Actuator

TASK 27-44-00-710-001-A
Operational Test of the Jamming Protection Device of the Trimmable Horizontal Stabilizer Actuator

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 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: 210
ZONE: 310

1. Reason for the Job
Refer to the MPD TASK: 274000-03
OPERATIONAL CHECK OF THS ACTUATOR JAMMING PROTECTION DEVICE
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	ACCESS PLATFORM 6M (20 FT) - ADJUSTABLE
No specific	AR	GAGE - FEELER
No specific	AR	GROUND INTERPHONE SYSTEM
No specific	AR	MARKER - INDELIBLE
0U190857	1	TOOL-JAMMING SIMULATION

B. Consumable Materials

REFERENCE	DESIGNATION
No specific	lockwire, corrosion-resistant steel, dia. 0.6 mm (0.024 in.)
No specific	permanent ink

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
210	CKPT,FWD COMPT BHD TO FLT COMPT BULKHEAD
310	FUSLG TAIL SECTION AFT OF AFT PRESS BHD
312AR

D. 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 27-44-00-710-003-A	Operational Test of the Trimmable Horizontal Stabilizer Actuator with both (Green and Yellow) and Individual Hydraulic Systems
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 31-60-00-860-002-A	EIS Stop Procedure
TASK 34-10-00-860-004-A	Inertial Reference (IR) Alignment-Procedure
TASK 34-10-00-860-004-A-01	Automatic Inertial Reference (IR) Alignment-Procedure
TASK 34-10-00-860-004-A-02	Inertial Reference (IR) Alignment-Procedure to do a Check of the Links between each Flight Management and Guidance Computer (FMGC) and the three Air Data/Inertial Reference Units (ADIRUs)
TASK 34-10-00-860-005-A	ADIRS Stop Procedure
Test Procedure of the Jamming Simulation Tool
Reference Marks of the Control Valve Detent
Operational Test of the Jamming Protection Device

3. Job Set-up
Subtask 27-44-00-010-050-B

A. Get Access
(1) Put the ACCESS PLATFORM 6M (20 FT) - ADJUSTABLE in position near to the access door 312AR.
(2) Open the access door 312AR.
(3) On the left and right valve control shaft (7) of the THS actuator:
(a) Cut, remove and discard the lockwire that safeties the cap (6) on the valve control shaft (7).

Test Procedure of the Jamming Simulation Tool

(b) Remove the cap (6) from the valve control shaft (7).
(c) Cut, remove and discard the lockwire that safeties the threaded bush (5).

Subtask 27-44-00-220-050-A

B. On the left and right threshold box assy do the subsequent steps:

CAUTION: YOU MUST DO ALL THE STEPS OF THIS TEST IN THE SEQUENCE GIVEN TO PREVENT INCORRECT OPERATION OF THE AIRCRAFT.

(1) Make sure that you cannot put a GAGE - FEELER with a thickness of 1.2 mm (0.0472 in.) into the gap

Reference Marks of the Control Valve Detent

between the input plate and the ball carrier of the control valve detent.
(2) If the control valve detent is centered, use MARKER - INDELIBLE to put two reference marks in line (if not already marked). Put one of the reference marks on the input plate, the other on the ball carrier.

NOTE: The control valve detent is centered when the feeler gage does not go in the gap.

(3) If the GAGE - FEELER goes in the gap, you must center the control valve detent again as written below:

Subtask 27-44-00-820-050-A

CAUTION: BE CAREFUL WHEN YOU INSTALL OR REMOVE THE JAMMING SIMULATION TOOL. PUSH OR PULL THE TOOL AND TURN THE MECHANICAL INPUT SHAFT AT THE SAME TIME. DO THIS UNTIL YOU FIND THE POSITION WHERE YOU CAN INSTALL OR REMOVE THE TOOL EASILY. THIS WILL PREVENT DAMAGE TO THE VALVE CONTROL SHAFT AND THE TOOL.

C. Recenter the left and the right control valve detents:

NOTE: The subsequent steps are not necessary if the control valve detent is centered (see above).

NOTE: The procedures for the left and the right control valve detents are the same. Therefore only one is described.

(1) Put one of the two sides (LH or RH which is applicable) of the 0U190857 TOOL-JAMMING SIMULATION on the splined end of the valve control shaft.

NOTE: Use the side (N.UP or N.DN) of the 0U190857 TOOL-JAMMING SIMULATION that puts the spigot nearest to the recess.

(2) Turn the mechanical input (1) of the THS actuator until the tool fits in the recess.

Operational Test of the Jamming Protection Device

(3) If the side with the LH or RH, A/C N.DN on the tool is installed, turn the mechanical input clockwise (CW) until the detent is recentered.

NOTE: When the detent is centered, you can hear a "CLICK".

(4) If the side with the LH or RH A/C N.UP on the tool is installed, turn the mechanical input (1) counterclockwise (CCW) until the detent is recentered.

NOTE: When the detent is centered, you can hear a "CLICK".

(5) Make sure that you cannot put the GAGE - FEELER with a thickness of 1.2 mm (0.0472 in.) into the gap between the input plate and the ball carrier of the control valve detent.
(6) Use permanent ink to put two reference marks in line (if not already marked). Put one of the reference marks on the input plate, the other on the ball carrier.

Reference Marks of the Control Valve Detent

(7) Remove the 0U190857 TOOL-JAMMING SIMULATION from the splined end of the control valve input shaft.

Subtask 27-44-00-865-050-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	FLIGHT CONTROLS/ELAC1/NORM/SPLY	15CE1	B11
49VU	FLIGHT CONTROLS/THS/ACTR/MOT2	19CE2	B09
49VU	FLIGHT CONTROLS/SEC1/NORM/SPLY	21CE1	B08
** ON A/C NOT FOR ALL
49VU	FLIGHT CONTROLS/ELAC1/NORM/SPLY	15CE1	B06
49VU	FLIGHT CONTROLS/THS/ACTR/MOT2	19CE2	B04
49VU	FLIGHT CONTROLS/SEC1/NORM/SPLY	21CE1	B03
** ON A/C ALL
105VU	FLIGHT CONTROLS/ELAC2/STBY SPLY	16CE2	A02
105VU	FLT CTL/ELAC1/STBY SPLY	16CE1	A01
121VU	FLIGHT CONTROLS/SEC3/SPLY	21CE3	Q19
121VU	FLIGHT CONTROLS/SEC2/SPLY	21CE2	Q18
121VU	FLIGHT CONTROLS/THS ACTR/MOT3	19CE3	Q17
121VU	FLIGHT CONTROLS/THS ACTR/MOT1	19CE1	Q16
121VU	FLIGHT CONTROLS/ELAC2/NORM/SPLY	15CE2	R20

Subtask 27-44-00-860-050-A

E. Preparation for the Test
(1) Energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-861-002).
(2) Pressurize the Green and the Yellow hydraulic systems (Ref. AMM TASK 29-23-00-863-001).
(3) On the overhead panel, on the ADIRS panel:

Set the 3 OFF/NAV/ATT selector switches to NAV (Ref. AMM TASK 34-10-00-860-004).

(4) Do the EIS start procedure (upper ECAM DU and lower ECAM DU only)
(Ref. AMM TASK 31-60-00-860-001).
(5) On the center pedestal on the ECAM control panel, push the F/CTL pushbutton switch.
(6) Make sure that, on the lower Display Unit (DU) of the ECAM, the F/CTL page comes on.
(7) Use the GROUND INTERPHONE SYSTEM or an equivalent system to communicate between the cockpit and the fuselage tail section.

4. Procedure

NOTE: Do the test in four steps.

Subtask 27-44-00-710-050-B

WARNING: MAKE SURE THAT THE CONTROL VALVE DETENTS ARE CENTERED EACH TIME YOU COMPLETE ONE OF THE FOUR TEST STEPS. IF THE DETENTS ARE NOT CENTERED, THE AIRCRAFT WILL NOT OPERATE CORRECTLY.

CAUTION: USE ONLY THE SPECIFIED TOOL. YOU CAN CAUSE DAMAGE TO THE ACTUATOR IF YOU USE A DIFFERENT TOOL.

A. Test of the RH Valve Block in the Electrical Mode

NOTE: Make sure that the tool is in the correct condition. If the splines of the tool are worn, the test results can be unsatisfactory.

ACTION	RESULT
1.On panel 23VU:	On panel 23VU:
Release the FLT CTL/ELAC 1 and the FLT CTL/SEC 1 pushbutton switches.	The OFF legends of the FLT CTL/ELAC 1 and FLT CTL/SEC 1 pushbutton switches come on.
2.On panel 24VU:	On panel 24VU:
Release the FLT CTL/ELAC 2 and FLT CTL/SEC 2 pushbutton switches.	The OFF legends of the FLT CTL/ELAC 2 and the FLT CTL/SEC 2 pushbutton switches come on.
3.On the center pedestal: Make sure that the pitch trim-control wheel is in the zero position. 4.Depressurize the Green and Yellow hydraulic systems (Ref. AMM TASK 29-23-00-864-001).
5.On the RH control valve block (3) of the THS actuator (4):	On the THS actuator (4):
Install the 0U190857 TOOL-JAMMING SIMULATION RH A/C N.UP on the shaft (7) of the RH control valve block. Test Procedure of the Jamming Simulation Tool	The control valve chain is in the jamming simulation configuration.
Push the 0U190857 TOOL-JAMMING SIMULATION on the splined end of the shaft (7) of the RH control valve.
Turn the mechanical input shaft (1) counterclockwise to turn the master spline, until the spigots of the tool engage with the slots of the valve block (3).	On the control valves of the THS actuator: The control valves are in the open position.
Fully push the tool to put the spigots in the slots. Test Procedure of the Jamming Simulation Tool
6.Pressurize the Green and the Yellow hydraulic systems (Ref. AMM TASK 29-23-00-863-001).	On the center pedestal: The pitch trim-control wheel moves to the aircraft nose-UP position (the THS leading edge moves down).
CAUTION: STOP THE PITCH TRIM CONTROL WHEEL WITH YOUR HANDS IF THE THS-ACTUATOR DOES NOT STOP APPROXIMATELY 5 SECONDS AFTER YOU HAVE PUSHED THE FLT CLT / ELAC 2 PUSH BUTTON SWITCH. THIS OPERATES THE JAMMING PROTECTION DEVICE WHICH PREVENTS DAMAGE TO THE STOP OF THE MECHANICAL INPUT SHAFT. 7.On the center pedestal and on panel 24VU:	On the THS actuator (4) and on panel 24VU:
Look at the pointer of the pitch trim-control wheel. When it is in the 5-degree nose-UP position, push the FLT CTL/ELAC 2 pushbutton switch.	The THS actuator stops (after approximately five seconds). On the upper ECAM DU: The ELAC 2 PITCH FAULT message comes on. The OFF legend of the FLT CTL/ELAC 2 goes off. If the THS actuator does not stop, contact Airbus Support.
8.On panel 24VU:	On panel 24VU:
Release the FLT CTL/ELAC 2 switch.	The OFF legend of the FLT CTL/ELAC 2 switch comes on. On the upper ECAM DU: The ELAC 2 PITCH FAULT message goes off.
9.Depressurize the Green and Yellow hydraulic systems (Ref. AMM TASK 29-23-00-864-001).
10.On the rudder pedals:
Operate the rudder pedals in the left and right directions.	After one minute, all the remaining pressure in the valve blocks of the THS actuator is released.
11.On the THS actuator (4):	On the RH threshold-box assemly: Reference Marks of the Control Valve Detent
If the control valve detent of the 'JAMMED' control valve is not in the center position, turn the mechanical input counterclockwise to set the control valve detent to the center position.	The control valve detent of the "JAMMED" control valve is in the center position (the ELAC 2 ground setting command possibly opened it) when you hear a "CLICK". At the same time, the reference marks on the input plate and the ball carrier of the control valve detent align.
12.On the RH control valve block (3) of the THS actuator (4): Remove the 0U190857 TOOL-JAMMING SIMULATION from the splined end of the control valve shaft.

Subtask 27-44-00-710-052-B

B. Test of the LH Valve Block in the Electrical Mode

NOTE: Make sure that the tool is in the correct condition. If the splines of the tool are worn, the test results can be unsatisfactory.

ACTION	RESULT
1.Pressurize the Green and Yellow hydraulic systems (Ref. AMM TASK 29-23-00-863-001). 2.Do the operational test of the jamming protection device again, in the configuration that follows:
On the center pedestal: Turn the pitch trim-control wheel to the zero position.	The THS surface moves to the zero position.
3.Depressurize the Green and Yellow hydraulic systems (Ref. AMM TASK 29-23-00-864-001).
4.On the LH control valve block (2) of the THS actuator (4):	On the THS actuator (4):
Install the 0U190857 TOOL-JAMMING SIMULATION LH A/C N.UP (0U190857) on the shaft (7) of the LH control valve block. Test Procedure of the Jamming Simulation Tool	The control valve chain is in the jamming simulation configuration.
Push the 0U190857 TOOL-JAMMING SIMULATION on the splined end of the shaft (7) of the LH control valve.
Turn the mechanical input shaft (1) counterclockwise to turn the master spline, until the spigots of the tool engage with the slots of the valve block (2).	On the control valves of the THS actuator: The control valves are in the open position.
Fully push the tool to engage the spigots in the slots. Test Procedure of the Jamming Simulation Tool
5.Pressurize the Green and Yellow hydraulic systems (Ref. AMM TASK 29-23-00-863-001).	On the center pedestal: The pitch trim-control wheel moves to the aircraft nose-UP direction (the THS leading edge moves down).
CAUTION: STOP THE PITCH TRIM CONTROL WHEEL WITH YOUR HANDS IF THE THS-ACTUATOR DOES NOT STOP APPROXIMATELY 5 SECONDS AFTER YOU HAVE PUSHED THE FLT CLT / ELAC 2 PUSH BUTTON SWITCH. THIS OPERATES THE JAMMING PROTECTION DEVICE WHICH PREVENTS DAMAGE TO THE STOP OF THE MECHANICAL INPUT SHAFT. 6.On the center pedestal and on panel 24VU:	On the THS actuator (4) and on panel 24VU:
Look at the pointer of the pitch trim-control wheel. When it is in the 5-degree nose-UP position, push the FLT CTL/ELAC 2 pushbutton switch.	The THS actuator stops (after approximately five seconds). On the upper ECAM DU: The ELAC 2 PITCH FAULT message comes on. The OFF legend of the FLT CTL/ELAC 2 goes off. If the THS actuator does not stop, contact Airbus Support.
7.On panel 24VU:	On panel 24VU:
Release the FLT CTL/ELAC 2 switch.	The OFF legend of the FLT CTL/ELAC 2 switch comes on. On the upper ECAM DU: - The ELAC 2 PITCH FAULT message goes off.
8.Depressurize the Green and Yellow hydraulic systems (Ref. AMM TASK 29-23-00-864-001).
9.On the rudder pedals:
Operate the rudder pedals in the left and right directions and wait one minute.	After one minute all the remaining pressure in the valve blocks of the THS actuator is released.
10.On the THS actuator (4):	On the LH threshold-box assembly: Reference Marks of the Control Valve Detent
If the control valve detent of the 'JAMMED' control valve is not in the center position, turn the mechanical input counterclockwise to set the control valve to the center position.	The control valve detent of the "JAMMED" control valve is in the center position (the ELAC 2 ground setting command possibly opened it) when you hear a "CLICK". At the same time, the reference marks on the input plate and the ball carrier ofthe control valve detent align.
11.On the LH control valve block (2) of the THS actuator (4): Remove the 0U190857 TOOL-JAMMING SIMULATION from the splined end of the control valve shaft.

Subtask 27-44-00-710-053-B

C. Do the test in the mechanical mode of the LH valve block.

NOTE: Make sure that the tool is in the correct condition. If the splines of the tool are worn, the test results can be unsatisfactory.

ACTION	RESULT
1.Pressurize the Green and Yellow Hydraulic systems (Ref. AMM TASK 29-23-00-863-001).
2.Do the operational test of the jamming protection device again, in the mechanical mode as follows:
On the center pedestal: Turn the pitch trim-control wheel to the 5 degree nose UP position.	The THS surface moves to the aircraft 5 degree nose UP position.
3.Depressurize the Green and Yellow hydraulic systems. (Ref. AMM TASK 29-23-00-864-001).
4.On the LH control-valve block (2) of the THS actuator (4):	On the THS actuator (4):
install the 0U190857 TOOL-JAMMING SIMULATION LH A/C N.DN (0U190857) on the shaft (7) of the LH control-valve block. Test Procedure of the Jamming Simulation Tool	the control-valve chain is in the jamming simulation configuration.
push the 0U190857 TOOL-JAMMING SIMULATION on the splined end of the shaft (7) of the LH control-valve.
turn the mechanical input shaft (1) clockwise (CW) to turn the master spline, until the spigots of the tool engage with the slots of the valve block (2).	On the control-valves of the THS actuator: the control-valves are in the open position.
fully push the tool to insert the spigots in the slots. Test Procedure of the Jamming Simulation Tool
5.Pressurize the Green and Yellow hydraulic systems (Ref. AMM TASK 29-23-00-863-001).	On the center pedestal: the pitch trim-control wheel moves to the aircraft nose DN direction (the THS leading edge moves up).
6.On the center pedestal:	On the THS actuator (4):
look at the pointer on the pitch trim-control wheel. Immediately before the 0 degree position, turn the wheel in the nose up direction to give a slight back order.	the jamming protection device is operated and the THS actuator (4) stops immediately.
7.Depressurize the Green and Yellow hydraulic systems. (Ref. AMM TASK 29-23-00-864-001).
8.On the rudder pedals:
operate the rudder pedals in the left and right directions and wait 1 minute.	after 1 minute all remaining pressure in the valve blocks of the THS actuator is released.
9.On the THS actuator (4):	On the LH threshold-box assy: Reference Marks of the Control Valve Detent
If the control valve detent of the 'JAMMED' control valve is not in the center position, turn the mechanical input in the clockwise (CW) direction to recenter the control valve detent.	the control-valve detent of the "JAMMED" control-valve is centered (which was possibly opened by the back order on the pitch trim-control wheel) when you hear a "CLICK". at the same time the reference marks on the input plate and the ball carrier of the control-valve detent must align.
10.On the LH control-valve block (2) of the THS actuator(4): remove the 0U190857 TOOL-JAMMING SIMULATION from the splined end of the control-valve shaft.

Subtask 27-44-00-710-054-B

D. Do the test in the mechanical mode of the RH valve block.

NOTE: Make sure that the tool is in the correct condition. If the splines of the tool are worn, the test results can be unsatisfactory.

ACTION	RESULT
1.Pressurize the Green and Yellow Hydraulic systems (Ref. AMM TASK 29-23-00-863-001).
2.Do the operational test of the jamming protection device again, in the mechanical mode as follows:
On the center pedestal: Turn the pitch trim-control wheel to the 5 degree nose UP position.	The THS surface moves to the aircraft 5 degree nose UP position.
3.Depressurize the Green and Yellow hydraulic systems.
4.On the RH control-valve block (3) of the THS actuator (4):	On the THS actuator (4):
install the 0U190857 TOOL-JAMMING SIMULATION RH A/C N.DN (0U190857) on the shaft (7) of the RH control-valve block. Test Procedure of the Jamming Simulation Tool	the control-valve chain is in the jamming simulation configuration.
push the 0U190857 TOOL-JAMMING SIMULATION on the splined end of the shaft (7) of the RH control-valve.
turn the mechanical input shaft (1) clockwise (CW) to turn the master spline, until the spigots of the tool engage with the slots of the valve block (3).	On the control-valves of the THS actuator: the control-valves are in the open position.
fully push the tool to insert the spigots in the slots. Test Procedure of the Jamming Simulation Tool
5.Pressurize the Green and Yellow hydraulic systems (Ref. AMM TASK 29-23-00-863-001).	On the center pedestal: the pitch trim-control wheel moves to the aircraft nose DN direction (the THS leading edge moves up).
6.On the center pedestal:	On the THS actuator (4):
look at the pointer on the pitch trim-control wheel. Immediately before the 0 degree position, turn the wheel in the nose up direction to give a slight back order.	the jamming protection device is operated and the THS actuator (4) stops immediately.
7.Depressurize the Green and Yellow hydraulic systems. (Ref. AMM TASK 29-23-00-864-001).
8.On the rudder pedals:
operate the rudder pedals in the left and right directions and wait 1 minute.	after 1 minute all remaining pressure in the valve blocks of the THS actuator is released.
9.On the THS actuator (4):	On the RH threshold-box assy Reference Marks of the Control Valve Detent
If the control valve detent of the 'JAMMED' control valve is not in the center position, turn the mechanical input in the clockwise (CW) direction to recenter the control valve detent.	the control-valve detent of the "JAMMED" control-valve is centered again (which was possibly opened by the back order on the pitch trim-control wheel) when you hear a "CLICK". at the same time the reference marks on the input plate and the ball carrier of the control-valve detent must align.
10.On the RH control-valve block (3) of the THS actuator (4): remove the 0U190857 TOOL-JAMMING SIMULATION from the splined end of the control-valve shaft.

Subtask 27-44-00-860-052-A

E. Put the system back to the serviceable condition.

WARNING: MAKE SURE THAT THE CONTROL VALVE DETENTS ARE CENTERED. IF THE DETENTS ARE NOT CENTERED THE AIRCRAFT WILL NOT OPERATE CORRECTLY.

(1) On the left and right threshold box assy:

Reference Marks of the Control Valve Detent

(a) Make sure that you cannot put a feeler gage with a thickness of 1.2 mm (0.0472 in.) into the gap between the input plate and the ball carrier of the control valve detent.
(b) If the feeler gage goes in the gap, you must recenter the control valve detent as specified in para. Job Set-Up, step C.
(2) On the panel 23VU:
(a) Push the FLT CTL/ELAC 1 pushbutton switch, (the OFF legend on this pushbutton switch goes off).
(b) Push the FLT CTL/SEC 1 pushbutton switch, (the OFF legend on this pushbutton switch goes off).
(3) On the panel 24VU:
(a) Push the FLT CTL/ELAC 2 pushbutton switch, (the OFF legend on this pushbutton switch goes off).
(b) Push the FLT CTL/SEC 2 pushbutton switch, (the OFF legend on this pushbutton switch goes off).

Subtask 27-44-00-410-053-B

F. Installation of the Caps
(1) On the left and right hydraulic valve blocks of the THS actuator (4):

Test Procedure of the Jamming Simulation Tool

(2) Install the caps (6) on the valve control shafts (7).
(3) Safety the caps (6) with lockwire, corrosion-resistant steel, dia. 0.6 mm (0.024 in.).
(4) Safety the threaded bushes (5) with lockwire, corrosion-resistant steel, dia. 0.6 mm (0.024 in.).

Subtask 27-44-00-710-055-A

G. Do an operational test of the THS actuator:

with both hydraulic systems
and
individual hydraulic system (Ref. AMM TASK 27-44-00-710-003).

5. Close-up
Subtask 27-44-00-860-051-A

A. Put the aircraft back to the serviceable condition.
(1) Make sure that the Green and Yellow hydraulic systems are depressurized.
(Ref. AMM TASK 29-23-00-864-001).
(2) On the overhead panel, on the ADIRS panel:

Set the 3 OFF/NAV/ATT selector switches to OFF (Ref. AMM TASK 34-10-00-860-005).

(3) Do the EIS stop procedure
(Ref. AMM TASK 31-60-00-860-002).
(4) De-energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-862-002).

Subtask 27-44-00-410-050-A

B. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the access door 312AR.
(3) Remove the access platform(s).

[Rev.10 from 2021] 2026.04.01 04:01:49 UTC