Reset of the Onboard Airport Navigation Computer (OANC)

TASK 34-38-00-860-801-A
Reset of the Onboard Airport Navigation Computer (OANC)

1. Reason for the Job
To do a reset of the OANC after maintenance.
2. Job Set-up Information
A. 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 34-38-00-860-054-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 EIS start procedure (upper ECAM DU and lower ECAM DU only)
(Ref. AMM TASK 31-60-00-860-001).

Subtask 34-38-00-865-050-A ** ON A/C NOT FOR ALL

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
121VU	OANS CMPTR	2FX	L10

4. Procedure
Subtask 34-38-00-860-055-A ** ON A/C NOT FOR ALL

A. Reset of the OANC

ACTION	RESULT
1.On the panel 121VU:	On the upper ECAM DU:
Pull the circuit breaker (2FX) and wait approximately for 45 seconds.	The ARPT NAV FAULT amber message comes into view.
2.On the panel 121VU:	On the upper ECAM DU:
Push the circuit breaker (2FX) and wait approximatively for 35 seconds.	The ARPT NAV FAULT amber message goes out of view.
3.On the glareshield, on the FCU, on the CAPT (F/O) EFIS control section: Set the mode selector switch to ROSE-NAV.	On the main instrument panel, on the CAPT (F/O) ND: The airport map is shown.

5. Close-up
Subtask 34-38-00-860-056-A ** ON A/C NOT FOR ALL

A. Put the aircraft back to its initial configuration.
(1) Make sure that the work area is clean and clear of tools and other items.
(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] 2026.04.02 06:23:19 UTC