Ramp Test of the Radio Altimeter (RA)

TASK 34-42-00-730-002-A
Ramp Test of the Radio Altimeter (RA)

WARNING: MAKE SURE THAT ALL THE CIRCUITS IN MAINTENANCE ARE ISOLATED BEFORE YOU SUPPLY ELECTRICAL POWER TO THE AIRCRAFT. UNWANTED ELECTRICAL POWER CAN BE DANGEROUS.

ZONE: 210

1. Reason for the Job
Test of the automatic simulation of a change in the altitude.

NOTE: If you do a ramp test on the Radio Altimeter (RA) 1 transceiver (2SA1), open circuit breaker 1SA2.
If you do a ramp test on the RA2 transceiver (2SA2), open circuit breaker 1SA1.

2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	ACCESS PLATFORM 2M (6 FT)
No specific	AR	BOOMSET 600 OHMS
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
DRA707B1	1	TEST SET-DIGITAL RADIO ALTIMETER

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
210	CKPT,FWD COMPT BHD TO FLT COMPT BULKHEAD
152HW, 826

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 31-32-00-860-010-A	Procedure to Get Access to the SYSTEM REPORT/TEST NAV Page
TASK 31-50-00-710-006-H	Operational Test of the Automatic Call-Out
TASK 31-50-00-710-009-A	Operational Test of the Automatic Call Out with the Radio Altimeter Simulator
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 34-42-00-860-052-C ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Put the ACCESS PLATFORM 2M (6 FT) in position at the AFT cargo door 826.
(2) Open the AFT cargo door 826.
(3) Remove the access panel 152HW.
(4) Connect the DRA707B1 TEST SET-DIGITAL RADIO ALTIMETER to the face of the transceiver.
(5) Do the EIS start procedure (PFDs only) (Ref. AMM TASK 31-60-00-860-001).
(6) On the overhead panel, on the ADIRS CDU, set the OFF/NAV/ATT selector switches to NAV.

Subtask 34-42-00-860-052-D ** 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) On the center pedestal, on one MCDU, get the SYSTEM REPORT/TEST/NAV page
(Ref. AMM TASK 31-32-00-860-010).
(3) Do the EIS start procedure (PFDs only) (Ref. AMM TASK 31-60-00-860-001).
(4) On ADIRS MSU panel 41VU, set the OFF/NAV/ATT selector switches to NAV.

Subtask 34-42-00-860-052-G ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Put the ACCESS PLATFORM 2M (6 FT) in position below aft cargo door 826.
(2) Open aft cargo door 826.
(3) Remove access panel 152HW.
(4) Connect DRA707B1 TEST SET-DIGITAL RADIO ALTIMETER to the face of the XVCR.
(5) Do the EIS start procedure (PFDs only) (Ref. AMM TASK 31-60-00-860-001).
(6) On ADIRS MSU panel 41VU, set the OFF/NAV/ATT selector switches to NAV.

Subtask 34-42-00-875-050-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
121VU	COM NAV/RAD ALTM/2	1SA2	K12
121VU	COM NAV/RAD ALTM/1	1SA1	K11

Subtask 34-42-00-875-051-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
121VU	EIS/GPWS/115VAC	3WZ	P07

Subtask 34-42-00-865-060-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
FOR FIN: 2SA1 (XCVRRA, 1)
121VU	COM NAV/RAD ALTM/2	1SA2	K12
FOR FIN: 2SA2 (XCVRRA, 2)
121VU	COM NAV/RAD ALTM/1	1SA1	K11

4. Procedure
Subtask 34-42-00-730-050-C ** ON A/C NOT FOR ALL

A. System Test

NOTE: This test is for the RA1. For the RA2, use the indications between parentheses.
If you do this test in descent, you can make sure that the auto call out announcements are correct. To do this, set a small SLOPE.
To decrease the total test time, increase the speed of the altitude change. To do this, adjust SLOPE to a larger value or set a lower STOP ALT.

NOTE: This test is the radio altimeter ramp test. For auto call-out announcement, do the operational test of the automatic call-out (Ref. AMM TASK 31-50-00-710-006).

ACTION	RESULT
1.On the MCDU: Push the line key adjacent to the RA1 (RA2) indication. Then push the line key adjacent to the RAMP TEST indication.	On the MCDU: The RA1 (RA2) RAMP TEST page comes into view with these indications: TWO SUCCESSIVES RAMPS: RAMP1: 500-50FT (10FT/S) RAMP2: 50-0FT (3FT/S) MAKE SURE THAT AUTO CALL OUT ALTITUDES ARE CORRECTLY ANNOUNCED
	On the CAPT (F/O) PFD: The ramp test starts. The altitude scale moves down from 500 to 0 ft. and stops after approximately 1 minute. When the altitude is between 500 and 0 ft., the red ribbon adjacent to the altitude scale moves up.
	On the MCDU: At the end of the test, the TEST OK page comes into view.
Push the line key adjacent to the RETURN indication.	The RA1 (RA2) page comes into view.

Subtask 34-42-00-730-050-F ** ON A/C NOT FOR ALL

A. System Test

NOTE: Use the BOOMSET 600 OHMS to speak to the person in the AFT cargo compartment and in the cockpit.

NOTE: This test is the radio altimeter ramp test. For auto call-out announcement, do the operational test of the automatic call-out with the Radio Altimeter Simulator (If available) (Ref. AMM TASK 31-50-00-710-009).

ACTION	RESULT
On the RA simulator: Set these values: * START ALT : 0 ft. * STOP ALT : 2500 ft. * SLOPE : 25 ft/s. (Ref NOTE 1).
Start the test.	On the CAPT and F/O PFDs, the ramp test starts. The altitude scale moves up to 2500 ft. and stops after approximately 1 minute 40 seconds. When the altitude increases: On the CAPT and F/O PFDs: . when the altitude is between 0 and 160 ft., the horizon line moves down. The elevation scale comes into view. . when the altitude is between 0 and 570 ft., the red ribbon adjacent to the altitude scale moves down and then it goes out of view.
Stop the test.	On the CAPT and F/O PFDs, the radio altitude data go out of view.

5. Close-up
Subtask 34-42-00-865-061-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
FOR FIN: 2SA1 (XCVRRA, 1)
121VU	COM NAV/RAD ALTM/2	1SA2	K12
FOR FIN: 2SA2 (XCVRRA, 2)
121VU	COM NAV/RAD ALTM/1	1SA1	K11

Subtask 34-42-00-875-052-A

B. 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
121VU	EIS/GPWS/115VAC	3WZ	P07

Subtask 34-42-00-860-053-C ** ON A/C NOT FOR ALL

C. 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 overhead panel, on the ADIRS CDU, set the OFF/NAV/ATT selector switches to OFF.
(3) Disconnect the RA simulator.
(4) Install the access panel 152HW.
(5) Close the AFT cargo door 826.
(6) Remove the access platform(s).

Subtask 34-42-00-860-053-D ** ON A/C NOT FOR ALL

C. Put the aircraft back to its initial configuration.
(1) On the center pedestal, on the MCDU, push the line key adjacent to the RETURN indication until the CFDS page comes into view.
(2) Do the EIS stop procedure (Ref. AMM TASK 31-60-00-860-002).
(3) On ADIRS MSU panel 41VU, set the OFF/NAV/ATT selector switches to OFF.
(4) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).
(5) Make sure that the work area is clean and clear of tools and other items.

Subtask 34-42-00-860-053-G ** ON A/C NOT FOR ALL

C. Put the aircraft back to its initial configuration.
(1) Do the EIS stop procedure (Ref. AMM TASK 31-60-00-860-002).
(2) On ADIRS MSU panel 41VU, set the OFF/NAV/ATT selector switches to OFF.
(3) Disconnect the RA simulator.
(4) Install access panel 152HW.
(5) Close aft cargo door 826.
(6) Remove the access platform(s).

[Rev.10 from 2021] 2026.04.02 06:23:23 UTC