Check of the Elevator Servo Control Oscillations.

TASK 27-34-00-200-002-A
Check of the Elevator Servo Control Oscillations.

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 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.

ZONE: 334
ZONE: 344
FIN: 34CE1
FIN: 34CE2
FIN: 34CE3
FIN: 34CE4

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 6M (20 FT) - ADJUSTABLE
No specific	AR	WARNING NOTICE(S)
98D27303003001	1	CHECK TOOL (ANALOG)-AILERON,ELEVATOR,RUDDER
98D27303022000	1	TOOL CHECK - DIGITAL, AILERON ELEVATOR RUDDER
98D27903500000	2	PIN-SIDE STICK LOCKING

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
334	THS TRAILING EDGE
344	THS TRAILING EDGE

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 27-34-51-000-008-A	Removal of the Elevator Servocontrol Actuator Servovalve
TASK 27-34-51-400-003-A	Installation of the Elevator Servocontrol Actuator Servovalve
TASK 29-10-00-863-001-A	Pressurize the Green Hydraulic System with a Hydraulic Ground Power-Cart
TASK 29-10-00-863-003-A	Pressurize the Blue Hydraulic System with a Hydraulic Ground Power-Cart
TASK 29-10-00-863-003-A-01	Pressurize the Blue Hydraulic System with the Blue Electric Pump
TASK 29-10-00-864-001-A	Depressurize the Green Hydraulic System
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 27-93-34-000-001-A	Removal of the ELAC (for corrective action)
TASK 27-93-34-400-001-A	Installation of the ELAC (for corrective action)

3. Job Set-up
Subtask 27-34-00-860-058-A

A. Aircraft Maintenance Configuration
(1) Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).
(2) Put the 98D27903500000 PIN-SIDE STICK LOCKING on the CAPT and F/O side sticks.
(3) Put the WARNING NOTICE(S) on the CAPT and F/O side sticks to tell persons not to touch the side sticks.
(4) Put the WARNING NOTICE(S) on the center pedestal, to tell persons not to touch the pitch-trim control wheel.
(5) On the panel 23VU:

make sure that the FLT CTL/ELAC 1 pushbutton switch is pushed (on this pushbutton switch, the OFF and FAULT legends are off).

(6) On the panel 24VU:

make sure that the FLT CTL/ELAC 2 pushbutton switch is pushed (on this pushbutton switch, the OFF and FAULT legends are off).

(7) Pressurize the Green hydraulic system
(Ref. AMM TASK 29-10-00-863-001) or (Ref. AMM TASK 29-23-00-863-001).

Subtask 27-34-00-480-053-A

B. Installation of the Tools
(1) Put the ACCESS PLATFORM 6M (20 FT) - ADJUSTABLE at zone 334 (344).
(2) Install the 98D27303003001 CHECK TOOL (ANALOG)-AILERON,ELEVATOR,RUDDER or 98D27303022000 TOOL CHECK - DIGITAL, AILERON ELEVATOR RUDDER on the rear cone, near the trailing edge of the elevator (left or right side).
(3) Put the pointer of the 98D27303003001 CHECK TOOL (ANALOG)-AILERON,ELEVATOR,RUDDER or 98D27303022000 TOOL CHECK - DIGITAL, AILERON ELEVATOR RUDDER at the trailing edge of the elevator.

4. Procedure
Subtask 27-34-00-220-056-A

A. Check of the Oscillation of the Servo Control of the Left Elevator
(1) On the dial indicator, measure the amplitude of the oscillations.
If the amplitude is more than 1 mm (0.0394 in.), replace the servovalve of the servo control (34CE1) (Ref. AMM TASK 27-34-51-000-008), (Ref. AMM TASK 27-34-51-400-003).
If the fault continues, replace the ELAC2 (2CE2) (Ref. AMM TASK 27-93-34-000-001) and (Ref. AMM TASK 27-93-34-400-001)
(2) Depressurize the Green hydraulic system (Ref. AMM TASK 29-10-00-864-001) or (Ref. AMM TASK 29-23-00-864-001).
(3) Pressurize the Blue hydraulic system (Ref. AMM TASK 29-10-00-863-003). On the dial indicator, measure the amplitude of the oscillations.
If the amplitude is more than 1 mm (0.0394 in.), replace the servovalve of the servo control (34CE3) (Ref. AMM TASK 27-34-51-000-008), (Ref. AMM TASK 27-34-51-400-003).
If the fault continues, replace the ELAC1 (2CE1) (Ref. AMM TASK 27-93-34-000-001) and (Ref. AMM TASK 27-93-34-400-001).
NOTE: If the check is done with SECs engaged instead of ELACs, the maximum amplitude will be:

3 mm for pitch up order
2 mm for pitch down order.

Subtask 27-34-00-220-057-A

B. Check of the Oscillation of the Servo Control of the Right Elevator
(1) On the dial indicator, measure the amplitude of the oscillations.
(2) If the amplitude is more than 1 mm (0.0394 in.), replace the servovalve of the servo control (34CE4) (Ref. AMM TASK 27-34-51-000-008), (Ref. AMM TASK 27-34-51-400-003).
If the fault continues, replace the ELAC 1 (2CE1) (Ref. AMM TASK 27-93-34-000-001) and (Ref. AMM TASK 27-93-34-400-001).
(3) Depressurize the Blue hydraulic system (Ref. AMM TASK 29-24-00-864-001).
(4) Pressurize the Yellow hydraulic system (Ref. AMM TASK 29-24-00-863-001).
(5) If the amplitude is more than 1 mm (0.0394 in.), replace the servovalve of the servo control (34CE2) (Ref. AMM TASK 27-34-51-000-008), (Ref. AMM TASK 27-34-51-400-003).
If the fault continues, replace the ELAC 2 (2CE2) (Ref. AMM TASK 27-93-34-000-001) and (Ref. AMM TASK 27-93-34-400-001).
NOTE: If the check is done with SECs engaged instead of ELACs, the maximum amplitude will be:

3 mm for pitch up order
2 mm for pitch down order.

5. Close-up
Subtask 27-34-00-860-059-A

A. Put the aircraft back to its initial configuration.
(1) Depressurize the Yellow hydraulic system (Ref. AMM TASK 29-24-00-863-001).
(2) Remove the 98D27303003001 CHECK TOOL (ANALOG)-AILERON,ELEVATOR,RUDDER or 98D27303022000 TOOL CHECK - DIGITAL, AILERON ELEVATOR RUDDER.
(3) Remove the 98D27903500000 PIN-SIDE STICK LOCKING.
(4) De-energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-862-002).
(5) Remove the maintenance equipment.
(a) Make sure that the work area is clean and clear of tools and other items.
(b) Remove the WARNING NOTICE(S).
(c) Remove the access platform(s).

[Rev.10 from 2021] 2026.03.31 23:50:13 UTC