BITE Test of the Integrated Standby Instrument System (ISIS) Indicator with the Pushbutton Switches on the Face of the Indicator

TASK 34-22-25-740-001-A
BITE Test of the Integrated Standby Instrument System (ISIS) Indicator with the Pushbutton Switches on the Face of the Indicator

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	SAFETY CLIP - CIRCUIT BREAKER

B. Work Zones and Access Panels

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

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 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

3. Job Set-up
Subtask 34-22-25-860-052-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).
(2) Do the IR Alignment procedure (Ref. AMM TASK 34-10-00-860-004)

Subtask 34-22-25-865-050-A ** ON A/C NOT FOR ALL

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	NAV/STBY/INST	5FN	F12

Subtask 34-22-25-865-051-A ** ON A/C NOT FOR ALL

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	NAV/STBY/INST	5FN	F12

Subtask 34-22-25-860-050-A ** ON A/C NOT FOR ALL

D. Aircraft Maintenance Configuration
(1) On the center instrument panel 401VU, on the ISIS indicator:

Make sure that the INIT 90 s indication comes into view
Make sure that the Functions page comes into view.

4. Procedure
Subtask 34-22-25-740-050-A ** ON A/C NOT FOR ALL

A. BITE Test of the Integrated Standby Instrument System (ISIS) Indicator
(1) Make sure that you do not move the aircraft during the alignment period (110s indication) of this test.
(2) Do the BITE test of the ISIS indicator as follows:

ACTION	RESULT
1.On center instrument panel 401VU, on the ISIS indicator:	On center instrument panel 401VU, on the ISIS indicator:
Push the BUGS and the LS pushbutton switches at the same time and hold them pushed for more than two seconds.	The maintenance page comes into view with TESTS and OTHER DATA indications.
Push the line key adjacent to the TESTS indication.	The TESTS page comes into view.
Push the line key adjacent to the FUNCTIONAL TEST (110s) indication.	The TEST page comes into view, and then, the IN PROGRESS 110s indication comes into view. At the end of the test, the TEST OK indication comes into view.
Push the RST pushbutton switch until the function page comes into view.

Subtask 34-22-25-740-055-A ** ON A/C NOT FOR ALL

B. BITE Test of the Integrated Standby Instrument System (ISIS) Indicator
(1) Make sure that you do not move the aircraft during the alignment period (110s) of this test.
(2) Do the BITE test of the ISIS indicator as follows:

ACTION	RESULT
1.On center instrument panel 401VU, on the ISIS indicator:	On center instrument panel 401VU, on the ISIS indicator:
Push the BUGS and the LS pushbutton switches at the same time and hold them pushed for more than two seconds.	The maintenance page comes into view.
Turn the BARO knob/pushbutton, or push the PLUS or MINUS pushbutton line key to select the FUNCTIONAL TEST.	There is a blue rectangle around the FUNCTIONAL TEST line.
Push the BARO knob/pushbutton.	The TEST page comes into view, and then, the IN PROGRESS 110s indication comes into view. At the end of the test, the TEST OK indication comes into view.
Push the RST pushbutton switch until the function page comes into view.

5. Close-up
Subtask 34-22-25-860-051-A ** ON A/C NOT FOR ALL

A. Put the aircraft back to its initial configuration.
(1) Do the ADIRS Stop procedure (Ref. AMM TASK 34-10-00-860-005)
(2) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).

[Rev.10 from 2021] 2026.04.02 07:14:40 UTC