Elevator Servocontrol Position-Transducer - Connection of the Spare Transducer

TASK 27-34-00-040-001-A
Elevator Servocontrol Position-Transducer - Connection of the Spare Transducer

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 TRAVEL RANGES OF THE FLIGHT CONTROLS SURFACES ARE CLEAR. MOVEMENT OF FLIGHT CONTROLS CAN CAUSE INJURY TO PERSONS AND/OR DAMAGE TO EQUIPMENT.

CAUTION: DO NOT USE THIS PROCEDURE IF THE SERVOCONTROL HAS ONE TRANSDUCER (RVDT SIMPLEX). THE AIRCRAFT DISPATCH IS NOT POSSIBLE.

ZONE: 334
ZONE: 344
Task Summary

Access	Test	Specific Tools	Mhr	E/T	Nb Men
YES	YES	NO	1.5	0.5	1

1. Reason for the Job
MMEL 27-34-02A
ELEVATOR SERVO-CONTROL POSITION TRANSDUCER
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 6M (20 FT) - ADJUSTABLE

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 27-34-00-710-001-A	Operational Test of the Elevator and Hydraulic Actuation
TASK 29-10-00-864-003-A	Depressurize the Blue Hydraulic System
TASK 29-23-00-864-001-A	Depressurize the Green and Yellow Hydraulic Systems after Operation of the PTU
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 Servocontrols Position-Transducers

3. Job Set-up
Subtask 27-34-00-860-068-A

A. Aircraft Maintenance Configuration
(1) Energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-861-002).
(2) On the overhead panel 23VU, release the FLT CTL/ELAC 1 and FLT CTL/SEC 1 pushbutton switches (on these pushbutton switches, the OFF legends come on).
(3) On the overhead panel 24VU, release the FLT CTL/ELAC 2, FLT CTL/SEC 2 and FLT CTL/SEC 3 pushbutton switches (on these pushbutton switches, the OFF legends come on).
(4) Depressurize the aircraft hydraulic systems:
(a) For the left elevator:

Depressurize the Green and Blue systems (Ref. AMM TASK 29-23-00-864-001) (Ref. AMM TASK 29-10-00-864-003).

(b) For the right elevator:

Depressurize the Yellow and Blue systems (Ref. AMM TASK 29-24-00-864-001) (Ref. AMM TASK 29-10-00-864-003).

Subtask 27-34-00-010-055-A

B. Get Access
(1) Put the ACCESS PLATFORM 6M (20 FT) - ADJUSTABLE in position:
(a) In the zone 334 for the left elevator.
(b) In the zone 344 for the right elevator.
(2) Open the THS trailing edge access panels (Ref. AMM TASK 55-13-11-000-001):
(a) 334DB for the left elevator.
(b) 344DB for the right elevator.

4. Procedure
Subtask 27-34-00-210-054-A

A. Visual Inspection of the Servocontrol to Identify the Number of Transducer on the Servocontrol:
(1) If the servocontrol has one transducer (RVDT simplex):
(a) The procedure is not applicable.
(2) If the servocontrol has two or three transducers (RVDT duplex or RVDT triplex), continue the procedure to do the connection of the spare transducer.

Subtask 27-34-00-040-050-B

B. Connection of the Spare Transducer:
(1) If the servocontrol has two transducers:
(a) Swap the connection of the electrical connectors (1) on the transducers (3).
(2) If the servocontrol has three transducers:
(a) Remove the electrical connector (1) from the defective transducer (3).
(b) Remove the blanking cap (2) from the new transducer and put it on the defective transducer.
(c) Connect the electrical connector (1) to the new transducer.

Subtask 27-34-00-710-052-A

C. Test
(1) On the overhead panel 23VU, push the FLT CTL/ELAC 1 and FLT CTL/SEC 1 pushbutton switches (on these pushbutton switches, the OFF legends go off).
(2) On the overhead panel 24VU, push the FLT CTL/ELAC 2, FLT CTL/SEC 2 and FLT CTL/SEC 3 pushbutton switches (on these pushbutton switches, the OFF legends go off).
(3) Do the operational test of the elevators (Ref. AMM TASK 27-34-00-710-001).

5. Close-up
Subtask 27-34-00-410-055-A

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the THS trailing edge access panels (Ref. AMM TASK 55-13-11-400-001):
(a) 334DB for the left elevator.
(b) 344DB for the right elevator.
(3) Remove the access platform(s).

Subtask 27-34-00-860-069-A

B. Put the aircraft back to its initial configuration.
(1) Make an entry in the log-book.
(2) De-energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-862-002).

[Rev.10 from 2021] 2026.03.31 23:50:01 UTC