Reactivation of Elevator Servocontrol Position-Transducer

TASK 27-34-00-440-001-A
Reactivation of Elevator Servocontrol Position-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

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 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 27-34-00-860-070-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 27-34-00-010-056-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 27-34-00-440-050-B

A. Reactivation of the Defective 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) of the replacement transducer (3).
(b) Remove the blanking cap (2) from the defective transducer (3) and install it on the replacement transducer.
(c) Connect the electrical connector (1) to the defective transducer (3).

Subtask 27-34-00-710-053-C

B. 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 this test:
Make sure that the transducer you reactivated is defective.

ACTION	RESULT
1.On the center pedestal, on the MCDU 1 (2), push the MCDU MENU mode key.	The MCDU shows the MCDU MENU page.
2.Push the line key adjacent to the CFDS indication.	The MCDU shows the CFDS page.
3.Push the line key adjacent to the SYSTEM REPORT/TEST indication.	The MCDU shows the SYSTEM REPORT/TEST page.
4.Push the line key adjacent to the F/CTL indication.	The MCDU shows the SYSTEM REPORT/TEST/F/CTL page.
5.Push the line key adjacent to the EFCS 1(2) indication.	The MCDU shows the EFCS1(2) page.
6.Push the line key adjacent to the GROUND SCAN indication.	The MCDU shows the EFCS1(2)/GROUND SCAN page.
7.Push the line key adjacent to the START GROUND SCAN indication and wait two minutes.
8.Push the line key adjacent to the GROUND SCAN STOP indication.
9.Push the line key adjacent to the GROUND REPORT indication.	Make sure that the display unit shows the fault indication related to the defective transducer.
10.On the MCDU, push the line select key adjacent to the RETURN indication until the CFDS menu page comes into view.	The MCDU shows the MCDU MENU page.

(4) Do the trouble shooting of the defective transducer.

5. Close-up
Subtask 27-34-00-410-056-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 27-34-00-862-056-A

B. De-energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-862-002).

[Rev.10 from 2021] 2026.03.31 23:50:03 UTC