Functional Test of the DME

TASK 34-51-00-720-001-A
Functional Test of the DME

WARNING: MAKE SURE THAT ALL THE CIRCUITS IN MAINTENANCE ARE ISOLATED BEFORE YOU SUPPLY ELECTRICAL POWER TO THE AIRCRAFT. UNWANTED ELECTRICAL POWER CAN BE DANGEROUS.

1. Reason for the Job
Make sure that the system operates correctly.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	TEST UNIT-GROUND,DME

B. 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 34-10-00-860-002-A	ADIRS Start 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
VOR/DME - Frequency Selection ** ON A/C NOT FOR ALL
VOR/DME - Frequency Selection ** ON A/C NOT FOR ALL
VOR/DME - Frequency Selection ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 34-51-00-860-052-A

A. Aircraft Maintenance Configuration
(1) Energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-861-002).
(2) Install the TEST UNIT-GROUND,DME near the DME1 (DME2) antenna. To do this, obey the operating instructions. Set the VOR/DME ground test unit to ON.
(3) Do the ADIRS start procedure (Ref. AMM TASK 34-10-00-860-002).
(4) Do the IR alignment procedure
(Ref. AMM TASK 34-10-00-860-004).
(5) On the EFIS control sections of the FCU, set the mode selector switches to ROSE or ARC.
(6) On the FCU, set the ADF/VOR selector switches to VOR.
(7) On the center pedestal, on the RMP1 and RMP2, set the ON/OFF selector switches to ON.

Subtask 34-51-00-865-054-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	NAV/VOR/DME/RMI	12FN	F13

Subtask 34-51-00-865-055-A

C. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
49VU	NAV/DME/1	1SD1	G14
121VU	COM NAV/DME/2	1SD2	K06

4. Procedure
Subtask 34-51-00-720-050-B ** ON A/C NOT FOR ALL

A. DME Reception and Identification Test

ACTION	RESULT
1.On the RMP1 (RMP2): set the VOR/DME1 (VOR/DME2) test frequency of the ground test unit VOR/DME - Frequency Selection ON A/C NOT FOR ALL VOR/DME - Frequency Selection ON A/C NOT FOR ALL
2.On the panel 49VU (121VU):
close the circuit breaker 1SD1 (1SD2).	On the CAPT and F/O NDs, on the left (right) side: the DME1 (DME2) flag goes out of view. the horizontal dashs come into view.
	On the VOR/ADF/DME RMI, in the left (right) window: the horizontal dashs come into view.
3.On the ground test unit, set the IDENT signal on.
4.On the center pedestal, on one ACP:
push the VOR1 (VOR2) pushbutton switch	You can hear the identification signal in the loudspeaker.
adjust the volume to the volume you need.	Do the adjustment slowly and continuously. There is no unwanted noise.
push the ON VOICE pushbutton switch.	The audio signal in the loudspeaker stops.
5.On the ground test unit, set the IDENT signal off.
6.On the ground test unit:
set a DME1 (DME2) range of 5 NM.	On the left (right) side of the CAPT and F/O NDs: the range 5.0 comes into view .
	On the VOR/ADF/DME RMI, in the left (right) window: the range 5.0 comes into view.
set a range of 270 NM.	On the ND and the VOR/ADF/DME RMI: the range 270.0 comes into view.
7.On the ground test unit, set the IDENT signal on.
8.On the center pedestal, on the ACP:
release the ON VOICE pushbutton switch.	You can hear the audio signal in the loudspeaker.
9.On the center pedestal, on the ATC control unit:
set the ATC master switch to the ON or XPNDR position.	On the CAPT and F/O NDs and the VOR/ADF/DME RMI: the DME1 (DME2) indication does not change.
	In the loudspeaker : the audio signal does not change.
set the ATC master switch to the standby position.
10.On the ground test unit, set the IDENT signal off.

Subtask 34-51-00-720-050-C ** ON A/C NOT FOR ALL

A. DME Reception and Identification Test

ACTION	RESULT
1.On the RMP1 (RMP2): set the VOR/DME1 (VOR/DME2) test frequency of the ground test unit. VOR/DME - Frequency Selection ON A/C NOT FOR ALL VOR/DME - Frequency Selection ON A/C NOT FOR ALL VOR/DME - Frequency Selection ** ON A/C NOT FOR ALL
2.On the panel 49VU (121VU) :
close the circuit breaker 1SD1 (1SD2).	On the CAPT and F/O NDs, on the left (right) side: the DME1 (DME2) flag goes out of view the horizontal dashs come into view.
3.On the ground test unit, set the IDENT signal on
4.On the center pedestal, on one ACP:
push the VOR1 (VOR2) pushbutton switch	You can hear the identification signal in the loudspeaker.
adjust the volume to the volume you need.	Do the adjustment slowly and continuously .There is no unwanted noise.
push the ON VOICE pushbutton switch.	The audio signal in the loudspeaker stops.
5.On the ground test unit:
set the IDENT signal off.
set a DME1 (DME2) range of 5 NM.	On the left (right) side of the CAPT and F/O NDs: the range 5.0 comes into view.
set a range of 270 NM.	On the ND: the range 270.0 comes into view.
6.On the ground test unit, set the IDENT signal on
7.On the center pedestal, on the ACP:
release the ON VOICE pushbutton switch.	You can hear the audio signal in the loudspeaker.
8.On the center pedestal, on the ATC control unit:
set the ATC master switch to the ON or XPNDR position.	On the CAPT and F/O NDs: the DME1 (DME2) indication does not change.
	In the loudspeaker : the audio signal does not change.
set the ATC master switch to the standby position.
9.On the ground test unit, set the IDENT signal off.

5. Close-up
Subtask 34-51-00-860-053-A

A. Put the aircraft back to its initial configuration.
(1) Do the ADIRS stop procedure (Ref. AMM TASK 34-10-00-860-005).
(2) On the center pedestal, on the RMP, set the ON/OFF switch to OFF.
(3) De-energize the DME ground test unit.
(4) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).
(5) Make sure that the work area is clean and clear of tools and other items.

[Rev.10 from 2021] 2026.04.02 07:15:37 UTC