Operational Test of the BACK-UP NAV Function

TASK 22-70-00-710-004-A
Operational Test of the BACK-UP NAV Function

ZONE: 210

1. Reason for the Job
Self explanatory
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 22-70-00-710-002-A	Operational Test of the Initialization of the Flight Plan
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 22-70-00-860-122-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Do the procedure of the flight plan entry (Ref. AMM TASK 22-70-00-710-002).
(2) Do the EIS start procedure (EWD DU, SD DU only) (Ref. AMM TASK 31-60-00-860-001).
(3) On the FCU, on the CAPTAIN and F/O EFIS control panels:

Set the mode selector switches to ROSE NAV.

(4) On the overhead panel, on the ADIRS MSU:

Set the three OFF/NAV/ATT selector switches to the NAV position.

4. Procedure
Subtask 22-70-00-710-065-A ** ON A/C NOT FOR ALL

A. Operation Test of the BACK-UP NAV Function
This test is for the system 1. For the other system(s), use the indications between the parentheses.

ACTION	RESULT
1.On the MCDU 1 (2): push the MCDU MENU mode key.	On the MCDU 1 (2): the MCDU MENU page comes into view.
2.On the MCDU 1 (2): push the line key adjacent to the SELECT NAV B/UP indication.	On the MCDU 1 (2): the B/UP F.PLN page comes into view. On the ND 1 (2): the lateral flight plan of the back-up navigation function is shown by a dotted line . It comes into view with the BACK UP NAV indication.
3.On the MCDU 1 (2): push the MCDU MENU mode key.	On the MCDU 1 (2): the MCDU MENU page comes into view.
4.On the MCDU 1 (2): push the line key adjacent to the DESELECT NAV B/UP indication.	On the MCDU 1 (2): The MCDU menu stays into views The DESELECT NAV B/UP prompt is changed into SELECT NAV B/UP. On the ND 1 (2): the BACK-UP NAV indication goes out of view and the active flight plan comes into view.

5. Close-up
Subtask 22-70-00-860-123-A ** ON A/C NOT FOR ALL

A. Put the aircraft back to its initial configuration.
(1) Do the EIS stop procedure (Ref. AMM TASK 31-60-00-860-002).
(2) On the ADIRS MSU, set the OFF/NAV/ATT selector switches to OFF.
(3) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).

[Rev.10 from 2021] 2026.03.31 23:10:56 UTC