Functional Test of the Altitude Reporting Function

TASK 34-52-00-720-004-A
Functional Test of the Altitude Reporting Function

NOTE: You must do this test very quickly to prevent interference with the air traffic, specially if the aircraft is in the open area. If the test is long, you must tell the nearest airport about this test.

NOTE: If the aircraft is in an open area, Airbus recommends that you tell the local ATC facilities that you will do a transponder test.

1. Reason for the Job
Functional Test of the Altitude Reporting Function.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	AR	TEST UNIT - ATC TCAS
No specific	AR	TESTER - AIR DATA

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 32-69-00-860-001-A	Simulation of Flight (With Aircraft on Ground)
TASK 34-10-00-860-002-A	ADIRS Start Procedure
TASK 34-10-00-860-005-A	ADIRS Stop Procedure
TASK 34-13-00-790-002-A	Leak Test of the Principal Static and Total Air Data System

3. Job Set-up
Subtask 34-52-00-865-074-A

WARNING: OPEN CIRCUIT BREAKER 7XE. THIS WILL PREVENT A POSSIBLE DEPLOYMENT OF THE RAT IF THE MAIN AC BUSBARS 1XP AND 2XP BECOME ISOLATED.

A. Open, safety and tag this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
105VU	ELEC/CSM/G /EV AUTO/SPLY	7XE	C01

Subtask 34-52-00-860-101-A ** ON A/C NOT FOR ALL

B. Aircraft Maintenance Configuration
(1) Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).
(2) Do the ADIRS start procedure (Ref. AMM TASK 34-10-00-860-002).
(3) If possible, install the TEST UNIT - ATC TCAS in the cockpit.
Put the antenna of the ATC ground test unit at 50 cm (approx. 2 ft) from the ATC antennas.
Connect the antenna to the ATC ground test unit.

Subtask 34-52-00-860-101-B ** ON A/C NOT FOR ALL

NOTE: For the test of the ATC 2 function, you must use the TCAS antennas (not the ATC 2 antennas).

Connect the antenna to the ATC ground test unit.

Subtask 34-52-00-860-108-D ** ON A/C NOT FOR ALL

C. Aircraft Maintenance Configuration
(1) On SWITCHING panel 8VU, make sure that the AIR DATA selector switch is set to NORM.
(2) Connect the TESTER - AIR DATA to the pitot/static system (Ref. AMM TASK 34-13-00-790-002).
(3) On the center pedestal, on the ATC/TCAS control unit:

Set ATC system 1(2) to on.
Set the ALT RPT ON/OFF switch to OFF.
Set the SBY/ON/TA/RA-TA switch to SBY.
Make sure that the display does not show an emergency code: 7500, 7600 or 7700.

(4) On GLARESHIELD panel 13VU, on the CAPT and the F/O EFIS control-sections of the Flight Control Unit (FCU), make sure that the baro displays show STD.
(5) On the center pedestal, on one Multipurpose Control & Display Unit (MCDU), get the LGCIU 1 (2) menu page and simulate a flight condition (Ref. AMM TASK 32-69-00-860-001).
(6) Start the air data generator and set the ATC ground-test unit to make it process the ATC mode-C replies.

Subtask 34-52-00-860-108-I ** ON A/C NOT FOR ALL

Select ATC system 1(2).
Set the STBY/ALT RPTG OFF/XPNDR/TA ONLY/TA-RA switch to ALT RPTG OFF.
Make sure that the display does not show an emergency code: 7500, 7600 or 7700.

(4) On GLARESHIELD panel 13VU, on the CAPT and the F/O EFIS control-sections of the Flight Control Unit (FCU), make sure that the baro displays show STD.
(5) On the center pedestal, on one Multipurpose Control & Display Unit (MCDU), get the LGCIU 1 (2) page and simulate a flight condition (Ref. AMM TASK 32-69-00-860-001).
(6) Start the air data generator and set the ATC ground-test unit to make it do the selective ATC mode-S interrogations.

Subtask 34-52-00-860-108-J ** ON A/C NOT FOR ALL

Set ATC system 1(2) to on.
Set the ALT RPTG/OFF/ON switch to OFF.
Set the AUTO/ON/STBY switch to STBY.
Make sure that the display does not show an emergency code: 7500, 7600 or 7700.

(4) On GLARESHIELD panel 13VU, on the CAPT and the F/O EFIS control-sections of the Flight Control Unit (FCU), make sure that the baro displays show STD.
(5) On the center pedestal, on one Multipurpose Control & Display Unit (MCDU), get the LGCIU 1 (2) page and simulate a flight condition (Ref. AMM TASK 32-69-00-860-001).
(6) Start the air data generator and set the ATC ground-test unit to make it do the selective ATC mode-S interrogations.

Subtask 34-52-00-865-056-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
49VU	COM NAV/ATC/1	5SH1	G11
** ON A/C NOT FOR ALL
121VU	COM NAV/ATC/2	5SH2	K07
** ON A/C NOT FOR ALL
121VU	T/TISS	2004SG	K07

4. Procedure
Subtask 34-52-00-720-073-D ** ON A/C NOT FOR ALL

A. Functional Test of the Altitude Reporting Function

ACTION	RESULT
1.On the air data generator: simulate one altitude value between 20,000 ft. and 25,000 ft.
2.On the ATC/TCAS control unit: set the SBY/ON/TA/RA-TA switch to ON.	On the ATC/TCAS control unit: the display shows the last code set. the ATC FAULT or FAIL indicator light stays off.
set the ALT RPT ON/OFF switch to ON.	On the ATC ground test unit, a display shows: the last code set. the standard altitude must be approximately the same as the altitude simulated in step 1.
3.On the PFDs: read the altitude value and compare it with the altitude from the ATC transponders	The difference between the altitude shown on the CAPT PFD and the ATC1 on the ATC ground test unit must not be more than 125 ft. The difference between the altitude shown on the F/O PFD and the ATC2 on the ATC ground test unit must not be more than 125 ft.
4.On the ATC/TCAS control unit: set the SBY/ON/TA/RA-TA switch to SBY.	On the ATC/TCAS control unit: the display stays on.
5.On the air data generator: slowly decrease pitot and static pressures until you get atmospheric values	The rate of descent must not be more than 6,000 ft.
6.Stop and disconnect the air data generator.
7.On the MCDU: push the line key adjacent to the RETURN indication until you get the CFDS menu page.	The flight condition is no longer simulated.

Subtask 34-52-00-720-073-I ** ON A/C NOT FOR ALL

A. Functional Test of the Altitude Reporting Function

ACTION	RESULT
1.On the air data generator: simulate one altitude value between 20,000 ft. and 25,000 ft.
2.On the ATC/TCAS control unit: set the STBY/ALT RPTG OFF/XPNDR/TA ONLY/TA-RA switch to XPNDR.	On the ATC/TCAS control unit: the display shows the last code set. the ATC FAULT or FAIL indicator light stays off.
	On the ATC ground test unit, a display shows: the last selected code. the standard altitude must be approximately the same as the altitude simulated in step 1.
3.On the PFDs: read the altitude value and compare it with the altitude from the ATC transponders	The difference between the altitude shown on the CAPT PFD and the ATC1 on the ATC ground test unit must not be more than 125 ft. The difference between the altitude shown on the F/O PFD and the ATC2 on the ATC ground test unit must not be more than 125 ft.
4.On the ATC/TCAS control unit: set the STBY/ALT RPTG OFF/XPNDR/TA ONLY/TA-RA switch to STBY.	On the ATC/TCAS control unit: the display stays on.
5.On the air data generator: slowly decrease pitot and static pressures until you get atmospheric values.	The rate of descent must not be more than 6,000 ft.
6.Stop and disconnect the air data generator.
7.On the MCDU: push the line key adjacent to the RETURN indication until you get the CFDS menu page.	The flight condition is no longer simulated.

Subtask 34-52-00-720-073-J ** ON A/C NOT FOR ALL

A. Functional Test of the Altitude Reporting Function

ACTION	RESULT
1.On the air data generator: simulate one altitude value between 20,000 ft. and 25,000 ft.
2.On the ATC/TCAS control unit: set the STBY/AUTO/ON switch to AUTO.	On the ATC/TCAS control unit: the display shows the last code set. the ATC FAULT or FAIL indicator light stays off.
set the ALT RPTG/ON/OFF switch to ON.	On the ATC ground test unit, a display shows: the last selected code. the standard altitude must be approximately the same as the altitude simulated in step 1.
3.On the PFDs: read the altitude value and compare it with the altitude from the ATC transponders.	The difference between the altitude shown on the CAPT PFD and the ATC1 on the ATC ground test unit must not be more than 125 ft. The difference between the altitude shown on the F/O PFD and the ATC2 on the ATC ground test unit must not be more than 125 ft.
4.On the ATC/TCAS control unit: set the STBY/AUTO/ON switch to STBY.	On the ATC/TCAS control unit: the display stays on.
5.On the air data generator: slowly decrease pitot and static pressures until you get atmospheric values.	The rate of descent must not be more than 6,000 ft.
6.Stop and disconnect the air data generator.
7.On the MCDU: push the line key adjacent to the RETURN indication until you get the CFDS menu page.	The flight condition is no longer simulated.

5. Close-up
Subtask 34-52-00-860-059-A

A. Put the aircraft back to its initial configuration.
(1) Disconnect the ATC ground test unit.
(2) Do the ADIRS stop procedure (Ref. AMM TASK 34-10-00-860-005).
(3) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).
(4) Make sure that the work area is clean and clear of tools and other items.

Subtask 34-52-00-865-075-A

B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
105VU	ELEC/CSM/G /EV AUTO/SPLY	7XE	C01

[Rev.10 from 2021] 2026.04.02 06:23:31 UTC