Operational Test of the GPS

TASK 34-36-00-710-008-A
Operational Test of the GPS

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 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-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 34-36-00-860-084-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration

NOTE: Do this test in an open area (not in the hangar).

(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).
(3) On the center pedestal, on the SWITCHING panel 8VU, make sure that the ATT HDG selector switch is at NORM.

Subtask 34-36-00-865-072-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
49VU	NAV/MMR/1	42RT1	G12
121VU	COM NAV/MMR/2	42RT2	L07

4. Procedure
Subtask 34-36-00-710-064-A ** ON A/C NOT FOR ALL

A. Operational Test of the GPS

NOTE: The actions and the results of this procedure occur on the MCDU used.

ACTION	RESULT
During the test, ignore all the indications shown on the NDs (this includes the GPS PRIMARY LOST indication).
Test of the GPS data acquisition with the IRS aligned
1.On the MCDU: Push the DATA mode key.	On the MCDU: The DATA INDEX page comes into view.
2.On the MCDU, on the DATA INDEX page: Push the line key adjacent to the GPS MONITOR indication.	On the MCDU: The GPS MONITOR page comes into view: NOTE: If you do this test after you replace the MMR, between one to twenty minutes are necessary before the GPS data comes into view on the MCDU. The NAV indication is shown below the MODE indication. The number of satellites tracked is shown below the SAT indication. The related values come into view below the GPS POSITION, GPS ALT, MERIT and GS indications: . The GPS 1 and the GPS 2 POSITION indications give the latitude/longitude of the aircraft. Make sure that the values of the two GPS positions are approximately the same.
3.On the overhead panel, on the ADIRS CDU: Set the DISPLAY DATA selector switch to "PPOS".	On the MCDU, on the GPS MONITOR page: Make sure that the GPS position data are approximately the same as the ADIRS position data on the ADIRS CDU.
4.Open circuit breakers 42RT1 and 42RT2.	On the upper ECAM DU: The NAV GPS 1 FAULT and NAV GPS 2 FAULT warnings come into view (the NAV ILS 1 FAULT and NAV ILS 2 FAULT warnings are also shown).
	On the MCDU, on the GPS MONITOR page: All the GPS data below the GPS POSITION, GPS ALT, TTRK, GS and MERIT indications for the two GPS, go out of view.
	On the CAPT and F/O NDs: The amber GPS PRIMARY LOST indication is shown. NOTE: The GPS PRIMARY LOST indication does not come into view immediately after you open circuit breakers 42RT1 and 42RT2. 60 minutes can be necessary before the indication comes into view. It is not necessary to wait for the GPS PRIMARY LOST indication to come into view (this indication is not important for the test).
5.Close circuit breakers 42RT1 and 42RT2.	On the upper ECAM DU: The NAV GPS 1 FAULT and NAV GPS 2 FAULT warnings go out of view (the NAV ILS 1 FAULT and NAV ILS 2 FAULT warnings also go out of view).
6.On the MCDU, on the GPS MONITOR page: The INIT indication comes into view below the MODE indication during some seconds. Then the ACQ indication comes into view below the MODE indication. The number below the SAT indication increases (number of satellites tracked). After 75 to 300 seconds, the ACQ indication goes out of view and the NAV indication comes into view below the MODE indication. The related values come into view below the GPS POSITION, GPS ALT, MERIT and GS indications.

Subtask 34-36-00-710-065-A ** ON A/C NOT FOR ALL

B. Operational Test of the Predictive GPS (with Honeywell ADIRU only)

NOTE: The actions and the results of this procedure occur on the MCDU used.

NOTE: This test is for system 1. For system 2, use the indications between the parentheses.

ACTION	RESULT
Test of the GPS operation through the PREDICTIVE GPS page on the MCDU
1.Open the circuit breaker 42RT2 (42RT1).
2.On the MCDU1 (MCDU2): Push the INIT mode key	On the MCDU1 (MCDU2): The INIT page comes into view
Enter origin/destination airport data that are in the database.	The origin/destination airport data come into view on the bottom line of the INIT page
Push the line key adjacent to the FROM/TO indication	The RTE SELECTION page comes into view
Push the line key adjacent to the RETURN indication	The INIT page comes into view.
3.On the MCDU1 (MCDU2): Push the PROG mode key.	On the MCDU1 (MCDU2): The PROGRESS page comes into view
Push the line key adjacent to the PREDICTIVE GPS indication	The PREDICTIVE GPS page comes into view
	The destination is displayed below the DEST indication
Enter GMT plus 1 hour below the ETA indication (Estimated Time of Arrival).	After some seconds, the Y or N indication comes into view below the -15, -10, -5, ETA, +5, +10, +15 indications.
4.Close the circuit breaker 42RT2 (42RT1).

5. Close-up
Subtask 34-36-00-860-085-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] 2026.04.01 04:04:51 UTC