W DOC AIRBUS | AMM A320F

BITE Test of the Onboard Aircraft Navigation System (OANS) (System Test)

TASK 34-38-00-740-801-A
BITE Test of the Onboard Aircraft Navigation System (OANS) (System Test)

ZONE: 210
1. Reason for the Job
To do a check of:
  • The integrity of the OANS
  • The execution of the safety tests
  • The validity of the external buses
  • The operational program configuration display
  • The video output.
2. Job Set-up Information
 A. Work Zones and Access Panels
ZONE/ACCESS
ZONE DESCRIPTION
210
CKPT,FWD COMPT BHD TO FLT COMPT BULKHEAD
 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 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
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
TASK 34-38-00-710-801-A
Operational Test of the Onboard Airport Navigation System (OANS)
F OANS Video Pattern
3. Job Set-up
Subtask 34-38-00-869-050-A ** ON A/C NOT FOR ALL
A. Maintenance Advice
If the interactive BITE test of the OANS does not operate correctly, do not do this procedure.
Subtask 34-38-00-860-061-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 EIS start procedure (upper ECAM DU and lower ECAM DU only)
(Ref. AMM TASK 31-60-00-860-001).
   (3) Do the IR alignment procedure (Ref. AMM TASK 34-10-00-860-004)
   (4) Do the procedure to get access to the SYSTEM REPORT/TEST NAV page (Ref. AMM TASK 31-32-00-860-010).
Subtask 34-38-00-865-054-A ** ON A/C NOT FOR ALL
C. Make sure that this(these) circuit breaker(s) is(are) closed:
PANELDESIGNATIONFINLOCATION
** ON A/C NOT FOR ALL
121VUOANS CMPTR2FXL10
4. Procedure
Subtask 34-38-00-740-050-A ** ON A/C NOT FOR ALL
A. BITE Test of the OANS (System Test)
NOTE: During this procedure, if an error message is shown, record this message. Then do the related trouble shooting procedure.
NOTE: During the test, obey the instructions shown on the Navigation Displays (ND).
ACTION
RESULT
1.On the CAPT and F/O FCUs:
  • Set the range knob to ZOOM position.

  • Set the mode knob to NAV position.
  • The aircraft map comes into view on ND and the aircraft symbol comes into view in magenta color.
2.On the MCDU:
On the MCDU:
  • Push the line key adjacent to the OANS indication
  • The OANS menu page comes into view.
  • Push the line key adjacent to the TEST indication
NOTE: The system test includes the video test.
  • The OANS TEST page comes into view.
  • The test is in progress for 360 seconds max.
  • The safety test is performed for 40 seconds.
  • The OPC page is shown for 180 seconds.

On the upper ECAM DU:
  • The warning message NAV:ARPT NAV FAULT comes into view.
3.On the CAPT FCU control panel:

  • Turn the CAPT FCU mode knob clockwise.
NOTE: If you do not do this, the OPC pages will stay into view for 180 seconds and then the video test pattern will come into view.
  • The video test pattern is displayed on both sides.
    F OANS Video Pattern ** ON A/C NOT FOR ALL
  • The video test pattern is inhibited on both sides for 10 seconds.
  • The video test pattern is displayed on both ND sides for 40 seconds.

On the upper ECAM DU:
  • The warning message NAV:ARPT NAV FAULT goes out of view.
  • If the video test is not OK, turn the CAPT FCU knob counter-clockwise (a failure message will be displayed at the end of the test).
NOTE: If the video test is OK, no action is required.

On the CAPT and F/O EFIS control panels:
  • Set the range knob in ZOOM position to 10NM.
  • Set the mode knob to ROSE-NAV position.

When the test sequence is displayed:
  • Make sure that the test message "TEST OK" is shown on the related MCDU.
  • The test procedure stops.
5. Close-up
Subtask 34-38-00-860-062-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) Do the EIS stop procedure
(Ref. AMM TASK 31-60-00-860-002).
   (3) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).
[Rev.10 from 2021] 2026.04.01 08:43:50 UTC
"Aviabrain" 2025