Operational Test of the Attitude/Heading (ATT/HDG) Switching Function

TASK 34-14-00-710-003-A
Operational Test of the Attitude/Heading (ATT/HDG) Switching Function

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
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	ACCESS PLATFORM 1M(3 FT)

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 31-60-00-860-001-A	EIS Start Procedure
TASK 31-60-00-860-002-A	EIS Stop Procedure

3. Job Set-up
Subtask 34-14-00-010-050-A

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

Loosen the two screws and remove the protective cover.

Subtask 34-14-00-865-054-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 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 34-14-00-860-055-A ** ON A/C NOT FOR ALL

C. Aircraft Maintenance Configuration
(1) Energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-861-002).
(2) On the overhead panel :

On the FLT CTL panels 23VU and 24VU, make sure that the FAC, ELAC and SEC pushbutton switches are not pushed (in). The OFF legends are on.
On the ADIRS CDU, make sure that the three OFF/NAV/ATT selector switches are at OFF.

(3) Do the EIS start procedure (PFD and ND only) (Ref. AMM TASK 31-60-00-860-001).

Subtask 34-14-00-860-055-B ** ON A/C NOT FOR ALL

C. Aircraft Maintenance Configuration
(1) Energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-861-002).
(2) On the overhead panel:

On flight control panels 23VU and 24VU, make sure that the FAC, ELAC and SEC pushbutton switches are released (the OFF legends are on).
On ADIRS MSU panel 41VU, make sure that the three OFF/NAV/ATT selector switches are set to OFF.

(3) Do the EIS start procedure (PFD and ND only) (Ref. AMM TASK 31-60-00-860-001).

4. Procedure
Subtask 34-14-00-710-054-A ** ON A/C NOT FOR ALL

A. Operational Test of the Attitude/Heading (ATT/HDG) Switching Function

ACTION	RESULT
1.On the ADIRS CDU : set the three OFF/NAV/ATT selector switches to NAV.	On the ADIRS CDU : the ON BAT light comes on for 5 seconds the three ALIGN legends come on. On the Captain and First Officer PFD : the ATT flags go out of view after approximately 30 seconds the pitch and roll attitudes are shown.
push the ADR1, ADR2 and ADR3 pushbutton switches.	make sure that the OFF legends of the ADR1, ADR2 and ADR3 pushbutton switches are on.
2.On the center pedestal, on the SWITCHING panel 8VU, set the ATT HDG selector switch to CAPT/3.
3.On the ADIRS CDU, set the OFF/NAV/ATT selector switch related to the IR1 to OFF.	On the ADIRS CDU, the ALIGN legend of the IR1 annunciator goes off On the Captain PFD, the pitch and roll attitudes stay in view.
4.On the center pedestal, on the SWITCHING panel 8VU, set the ATT HDG selector switch to NORM then to F/O/3.	On the Captain PFD, the ATT flag is shown (ignore the related warnings).
5.On the ADIRS CDU, set the OFF/NAV/ATT selector switch related to the IR2 to OFF.	- On the ADIRS CDU, the ALIGN legend of the IR2 annunciator goes off - On the First Officer PFD, the pitch and roll attitudes stay in view.
6.On the center pedestal, on the SWITCHING panel 8VU, set the ATT HDG selector switch to NORM.	On the First Officer PFD, the ATT flag is shown (ignore the related warnings).
7.On the ADIRS CDU :
set the OFF/NAV/ATT selector switch related to the IR3 to OFF	On the ADIRS CDU, the ALIGN legend of the IR3 annunciator goes off.

Subtask 34-14-00-710-054-B ** ON A/C NOT FOR ALL

A. Operational Test of the Attitude/Heading (ATT/HDG) Switching Function

ACTION	RESULT
1.On ADIRS MSU panel 41VU: Set the three OFF/NAV/ATT selector switches to NAV.	On ADIRS MSU panel 41VU: The ON BAT light comes on for 5 seconds. On the Captain and First Officer PFD : The ATT flags go out of view after approximately 30 seconds. The pitch and roll attitudes are shown.
Push ADR1, ADR2 and ADR3 pushbutton switches.	Make sure that the OFF legends of ADR1, ADR2 and ADR3 pushbutton switches are on.
2.On the center pedestal, on the SWITCHING panel 8VU, set the ATT HDG selector switch to CAPT/3.
3.On ADIRS MSU panel 41VU, set the OFF/NAV/ATT selector switch related to IR1 to OFF.	On the Captain PFD, the pitch and roll attitudes stay in view.
4.On the center pedestal, on the SWITCHING panel 8VU, set the ATT HDG selector switch to NORM then to F/O/3.	On the Captain PFD, the ATT flag is shown (ignore the related warnings).
5.On ADIRS MSU panel 41VU, set the OFF/NAV/ATT selector switch related to IR2 to OFF.	On the First Officer PFD, the pitch and roll attitudes stay in view.
6.On the center pedestal, on the SWITCHING panel 8VU, set the ATT HDG selector switch to NORM.	On the First Officer PFD, the ATT flag is shown (ignore the related warnings).

5. Close-up
Subtask 34-14-00-860-056-A

A. Put the aircraft back to its initial configuration.
(1) Do the EIS stop procedure
(Ref. AMM TASK 31-60-00-860-002).
(2) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).
(3) Make sure that the work area is clean and clear of tools and other items.
(4) Put the aircraft back to the serviceable condition.

Subtask 34-14-00-410-050-A

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

[Rev.10 from 2021] 2026.04.01 08:25:45 UTC