Check of the Position of the Fluid-Reserve Piston of the Elevator Servo Control with the Hydraulic Reservoirs Depressurized

TASK 27-34-00-220-001-A
Check of the Position of the Fluid-Reserve Piston of the Elevator Servo Control with the Hydraulic Reservoirs Depressurized

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
Refer to the MPD TASK: 273400-03
CHECK FLUID RESERVE PISTON POSITION WITH HYDRAULIC RESERVOIR DEPRESSURIZED.
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	RULE
No specific	AR	WARNING NOTICE(S)
98D27903500000	2	PIN-SIDE STICK LOCKING

B. Work Zones and Access Panels

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

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 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 29-10-00-864-003-A	Depressurize the Blue Hydraulic System
TASK 29-14-00-614-001-A	Depressurization of the Hydraulic Reservoirs
TASK 29-14-00-614-002-A	Pressurization of the Hydraulic Reservoirs through the Ground Connector
TASK 29-14-00-614-002-A-01	Pressurization of the Hydraulic Reservoirs with the Auxiliary Power Unit (APU)
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 55-13-11-000-001-A	Remove/Open of the Trimmable Horizontal Stabilizer (THS) Trailing-Edge Access-Panels
TASK 55-13-11-400-001-A	Install/Close of the Trimmable Horizontal Stabilizer (THS) Trailing-Edge Access-Panels
Elevator Servo Control ** ON A/C NOT FOR ALL
Elevator Servo Control ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 27-34-00-010-057-A

A. Get Access
(1) Put the ACCESS PLATFORM 6M (20 FT) - ADJUSTABLE in position.
(2) Open the THS trailing edge access panels 334DB 344DB (Ref. AMM TASK 55-13-11-000-001).

Subtask 27-34-00-865-063-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
49VU	L/G/LGCIU/SYS1/NORM	1GA	C09
121VU	HYDRAULIC/LGCIU/SYS2	2GA	Q35
121VU	HYDRAULIC/LGCIU/SYS1/GRND SPLY	52GA	Q34

Subtask 27-34-00-860-050-A

C. Aircraft Maintenance Configuration
(1) Energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-861-002).
(2) On the overhead panel 20VU, make sure that:

the 3 OFF/NAV/ATT selector switches are in OFF position.

(3) Make sure that there is no warning related to the LGCIUs on the upper ECAM display unit.
(4) Pressurize the aircraft hydraulic systems (Ref. AMM TASK 29-23-00-863-001) (Ref. AMM TASK 29-24-00-863-001) (Ref. AMM TASK 29-10-00-863-003).
(5) On each servo control (1), make sure that the indicator of the fluid-reserve (2) piston is in the maximum extended position.

Elevator Servo Control ** ON A/C NOT FOR ALL

(6) Depressurize the aircraft hydraulic systems (Ref. AMM TASK 29-23-00-864-001) (Ref. AMM TASK 29-24-00-864-001) (Ref. AMM TASK 29-10-00-864-003).
(7) Depressurize the hydraulic reservoirs (Ref. AMM TASK 29-14-00-614-001).
(8) Put WARNING NOTICE(S) in position to tell persons not to pressurize the hydraulic systems:

in the cockpit, on the HYD overhead panel 40VU,
on the ground service panels.

(9) Put a warning notice on the access door 195BB to tell persons not to pressurize the hydraulic reservoirs.
(10) Install the 98D27903500000 PIN-SIDE STICK LOCKING on the CAPT and F/O side sticks.
(11) Put a WARNING NOTICE(S) on the CAPT and F/O side sticks to tell persons not to touch the side sticks.
(12) Put a WARNING NOTICE(S) on the pitch-trim control wheels to tell persons, not to use the pitch trim.

4. Procedure
Subtask 27-34-00-220-054-A

A. Check of the Position of the Fluid-Reserve Piston of the Elevator Servo Control with the Hydraulic Reservoirs Depressurized

Elevator Servo Control ** ON A/C NOT FOR ALL

(1) After three hours, on the fluid reserve (2), with a RULE make sure that the indicator does not retract more than 32 mm (1,2598 in.).

If the indicator retracts more than 32 mm (1.2598 in.), the pressure and return line closing valves are not sealed. You must remove the servo control (1) for repair.

5. Close-up
Subtask 27-34-00-410-057-A

A. Close Access
(1) Close the THS trailing edge access panels 334DB 344DB (Ref. AMM TASK 55-13-11-400-001).
(2) Remove the access platform(s).

Subtask 27-34-00-860-051-A

B. Put the Aircraft Back to its Initial Configuration
(1) Remove the 98D27903500000 PIN-SIDE STICK LOCKING from the CAPT and F/O side sticks.
(2) Make sure that the work area is clean and clear of tools and other items.
(3) Remove the WARNING NOTICE(S).
(4) Pressurize the hydraulic reservoirs (Ref. AMM TASK 29-14-00-614-002).
(5) De-energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-862-002).

[Rev.10 from 2021] 2026.03.31 23:50:11 UTC