Operational Test of the Attitude/Heading (ATT/HDG) Comparison Warning

TASK 34-14-00-710-004-A
Operational Test of the Attitude/Heading (ATT/HDG) Comparison Warning

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.

ZONE: 210

1. Reason for the Job
Refer to the MPD TASK: 341400-02
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	ACCESS PLATFORM 1M(3 FT)
No specific	AR	SAFETY BARRIER(S)
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
210	CKPT,FWD COMPT BHD TO FLT COMPT BULKHEAD
822

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 31-32-00-860-010-A	Procedure to Get Access to the SYSTEM REPORT/TEST NAV Page
TASK 31-60-00-860-001-A	EIS Start Procedure
TASK 31-60-00-860-002-A	EIS Stop Procedure
TASK 34-10-00-860-004-A	IR Alignment Procedure
TASK 34-10-00-860-004-A-01	Automatic IR Alignment Procedure
TASK 34-10-00-860-004-A-02	IR Alignment Procedure to do a Check of the Links between each FMGC and the three Air Data/Inertial Reference Units (ADIRUs)

3. Job Set-up
Subtask 34-14-00-010-051-A

A. Get Access
(1) Put the ACCESS PLATFORM 1M(3 FT) in position at the access door 822.
(2) Open the access door 822.
(3) On the battery power center 105VU:

loosen the two screws and remove the protective cover.

Subtask 34-14-00-865-055-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 PROBES/ADIRU3/PWR/SWTG	8FP	F09
** ON A/C ALL
49VU	L/G/LGCIU/SYS1/NORM	1GA	C09
49VU	NAV PROBES/ADIRU 1/AND AOA 1/26VAC	5FP1	F07
49VU	NAV PROBES/ADIRU1/115VAC	4FP1	F06
** ON A/C NOT FOR ALL
49VU	NAV PROBES/ADIRU3/PWR/SWTG	8FP	F08
** ON A/C ALL
105VU	ADIRS/ADIRU1/28VDC	6FP1	C02
** ON A/C NOT FOR ALL
121VU	ADIRS/ADIRU/2PWR/SHED	10FP	N10
** ON A/C ALL
121VU	ADIRS/ADIRU/3PWR/SWTG	9FP	N09
121VU	ADIRS/ADIRU/2/26VAC AND AOA	5FP2	N08
121VU	ADIRS/ADIRU/3/26VAC AND AOA	5FP3	N07
121VU	ADIRS/ADIRU/2/115VAC	4FP2	N06
121VU	ADIRS/ADIRU/3/115VAC	4FP3	N05
121VU	ADIRS/ADIRU/2/28VDC	6FP2	N04
121VU	ADIRS/ADIRU/3/28VDC	6FP3	N03
121VU	HYDRAULIC/LGCIU/SYS2	2GA	Q35
121VU	HYDRAULIC/LGCIU/SYS1/GRND SPLY	52GA	Q34
** ON A/C NOT FOR ALL
121VU	ADIRS/2PWR/SHED &/AOA2 MON	10FP	N10

Subtask 34-14-00-865-056-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.

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
49VU	AUTO FLT/FAC1/28VDC	5CC1	B04
105VU	ELEC/CSM/G /EV AUTO/SPLY	7XE	C01
121VU	AUTO FLT/FAC2/28VDC	5CC2	M19

Subtask 34-14-00-860-057-A ** ON A/C NOT FOR ALL

D. Aircraft Maintenance Configuration
(1) Energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-861-002).
(2) Do the EIS start procedure (Ref. AMM TASK 31-60-00-860-001).
(3) On the ADIRS CDU, make sure that the three OFF/NAV/ATT selector switches are at OFF.
(4) On the FCU, on the CAPT and F/O EFIS control sections, set the mode selector switch to the ROSE-NAV .
(5) On one MCDU, get the SYSTEM REPORT/TEST/NAV page.
(Ref. AMM TASK 31-32-00-860-010)
(6) Put the SAFETY BARRIER(S) in position around the RAT area.

Subtask 34-14-00-860-057-C ** ON A/C NOT FOR ALL

D. Aircraft Maintenance Configuration
(1) Energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-861-002).
(2) Do the EIS start procedure (Ref. AMM TASK 31-60-00-860-001).
(3) On the ADIRS MSU, make sure that the three OFF/NAV/ATT selector switches are at OFF.
(4) On the FCU, on the CAPT and F/O EFIS control sections, set the mode selector switch to the ROSE-NAV .
(5) On one MCDU, get the SYSTEM REPORT/TEST/NAV page.
(Ref. AMM TASK 31-32-00-860-010)
(6) Put the SAFETY BARRIER(S) in position around the RAT area.

4. Procedure
Subtask 34-14-00-710-055-E ** ON A/C NOT FOR ALL

A. Operational Test of the Attitude/Heading (ATT/HDG) Comparison Warning

ACTION	RESULT
1.On the ADIRS CDU, set the OFF/NAV/ATT selector switches related to the IR1 and IR2 to NAV.
2.Align the two ADIRUs (IR) (Ref. AMM TASK 34-10-00-860-004). After approximately 5 minutes, the CAPT and F/O NDs show the heading dial.
3.On the MCDU, on the NAV page:	On the MCDU:
push the line key adjacent to the IR1 indication	The IR1 page comes into view.
push the line key adjacent to the INTERFACE TEST indication	The IR1 INTERFACE TEST 1/2 page comes into view.
on the keyboard push the NEXT PAGE function key.	The IR1 INTERFACE TEST 2/2 page comes into view.
push the line key adjacent to the START TEST indication	After two seconds : the CAPT PFD shows this position : ROLL 45° Right. PITCH 5° Up. the CAPT ND shows this position : HDG 15°. NOTE: Only the test values used for comparison in the FWC are shown.
	On the CAPT and F/O PFDs, the CHECK ATT indication flashes during a short time then stays stable On the CAPT and F/O NDs, the CHECK HDG indication comes into view On the upper ECAM display unit, these indications come into view : NAV HDG DISCREPANCY - HDG.............X CHECK - ATT HDG SWTG....AS RQRD NAV ATT DISCREPANCY - ATT.............X CHECK - ATT HDG SWTG....AS RQRD On the panels 130VU and 131VU, the MASTER CAUT lights come on You can hear the single chime. NOTE: If the aircraft heading is equal to 15 degrees, plus or minus 5 degrees, the CHECK HDG and HDG DISCREPANCY indications do not come into view.
push the line key adjacent to the RETURN indication.	The test stops. The indications above go out of view. The attitude and heading indications come into view.
4.On the ADIRS CDU, set the OFF/NAV/ATT selector switches related to the IR1 and IR2 to OFF.

Subtask 34-14-00-710-055-F ** ON A/C NOT FOR ALL

A. Operational Test of the Attitude/Heading (ATT/HDG) Comparison Warning

ACTION	RESULT
1.On the ADIRS MSU, set the OFF/NAV/ATT selector switches related to the IR1 and IR2 to NAV.
2.Align the two ADIRUs (IR) (Ref. AMM TASK 34-10-00-860-004). After approximately 5 minutes, the CAPT and F/O NDs show the heading dial.
3.On the MCDU, on the NAV page:	On the MCDU:
Push the line key adjacent to the IR1 indication.	The IR1 page comes into view.
Push the line key adjacent to the INTERFACE TEST indication.	The IR1 INTERFACE TEST 1/2 page comes into view.
On the keyboard push the NEXT PAGE function key.	The IR1 INTERFACE TEST 2/2 page comes into view.
Push the line key adjacent to the START TEST indication.	After two seconds: The CAPT PFD shows this position: ROLL 45° Right. PITCH 5° Up. The CAPT ND shows this position : HDG 15°. NOTE: Only the test values used for comparison in the FWC are shown.
	On the CAPT and F/O PFDs, the CHECK ATT indication flashes during a short time then stays stable. On the CAPT and F/O NDs, the CHECK HDG indication comes into view. On the upper ECAM display unit, these indications come into view: NAV HDG DISCREPANCY - HDG.............X CHECK - ATT HDG SWTG....AS RQRD NAV ATT DISCREPANCY - ATT.............X CHECK - ATT HDG SWTG....AS RQRD On the F/O and CAPT glareshield panels 130VU and 131VU, the MASTER CAUT lights come on. You can hear the single chime. NOTE: If the aircraft heading is equal to 15 degrees, plus or minus 5 degrees, the CHECK HDG and HDG DISCREPANCY indications do not come into view.
Push the line key adjacent to the RETURN indication.	The test stops. The indications above go out of view. The attitude and heading indications come into view.
4.On the ADIRS MSU, set the OFF/NAV/ATT selector switches related to the IR1 and IR2 to OFF.

5. Close-up
Subtask 34-14-00-860-058-A

A. Put the aircraft back to its initial configuration.
(1) On the MCDU, push the MCDU MENU mode key.
(2) Do the EIS stop procedure
(Ref. AMM TASK 31-60-00-860-002) potentiometers to OFF.
(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.
(5) Put the aircraft back to the serviceable condition.

Subtask 34-14-00-865-057-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
49VU	AUTO FLT/FAC1/28VDC	5CC1	B04
105VU	ELEC/CSM/G /EV AUTO/SPLY	7XE	C01
121VU	AUTO FLT/FAC2/28VDC	5CC2	M19

Subtask 34-14-00-410-051-A

C. Close Access
(1) Install the protective cover on the battery power center 105VU.
(2) Tighten the two screws.
(3) Close the access door 822.
(4) Remove the access platform.

[Rev.8 from Aug 2017] 2026.04.02 06:23:11 UTC