W DOC AIRBUS | AMM A320F

BITE Test of the Radio Altimeter

TASK 34-42-00-740-002-A
BITE Test of the Radio Altimeter

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
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 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 34-10-00-860-002-A
ADIRS Start Procedure
TASK 34-10-00-860-005-A
ADIRS Stop Procedure
3. Job Set-up
Subtask 34-42-00-860-054-A
A. Aircraft Maintenance Configuration
   (1) Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).
   (2) Do the EIS start procedure (PFDs only) (Ref. AMM TASK 31-60-00-860-001).
   (3) Do the ADIRS Start Procedure (Ref. AMM TASK 34-10-00-860-002).
   (4) On the center pedestal, on one MCDU, get the SYSTEM REPORT/TEST/NAV page (Ref. AMM TASK 31-32-00-860-010).
Subtask 34-42-00-865-056-A
B. Make sure that this(these) circuit breaker(s) is(are) closed:
PANELDESIGNATIONFINLOCATION
** ON A/C ALL
121VUCOM NAV/RAD ALTM/21SA2K12
121VUCOM NAV/RAD ALTM/11SA1K11
4. Procedure
Subtask 34-42-00-740-051-A ** ON A/C NOT FOR ALL
A. BITE Test
NOTE: - During the test, you can hear auto call-out announcements 40 or 41 or 42.
- It is necessary to open the RA1 circuit breaker to hear auto call-out announcements during the RA2 ARINC TEST.
ACTION
RESULT
On the MCDU:

  • Get access to the LRRA1 (LRRA2) page. Then push the line key adjacent to the ARINC TEST indication.
On the CAPT PFD (F/O PFD):
  • The bottom sector line moves down from the horizon line
  • The radio altitude indication is 40 feet. At the end of the test, on the MCDU, the TEST OK message comes into view.
  • Push the line key adjacent to the RETURN indication.
On the CAPT PFD (F/O PFD):
  • The bottom sector line moves up to the horizon line
  • The radio altitude indication is 0 feet. On the MCDU, the LRRA1 (LRRA2) page comes into view.
Subtask 34-42-00-740-051-E ** ON A/C NOT FOR ALL
A. BITE Test
NOTE: - During the test, you can hear auto call out announcements 40 or 41 or 42
- You must open the RA1 circuit breaker to hear auto call out announcements during the RA2 SYSTEM TEST.
ACTION
RESULT
1.On the MCDU:
On the MCDU:
  • Get the RA1 (RA2) page then push the line key adjacent to the SYSTEM TEST indication.
  • The INITIAL CONDITIONS are shown (page 1 to 2).
  • Push the line key adjacent to the START TEST indication.
  • The TEST IN PROGRESS 5S indication comes into view.

After 5 seconds, the indication that follows comes into view:
  • MAKE SURE THAT THE RADIO ALTITUDE DISPLAYED ON THE CAPTAIN (F/O) PFD WAS 40FT.
2.On the CAPT (F/O) PFD:
On the CAPT (F/O) PFD:
  • Make sure that the condition is correct.
  • The bottom sector line moves down from the horizon line
  • The radio altitude indication is 40 ft.
3.On the MCDU:
On the MCDU:
  • Push the line key adjacent to the YES indication.
  • The TEST OK indication comes into view.

On the CAPT (F/O) PFD:
  • The bottom sector line moves up to the horizon line
  • The radio altitude indication is O ft.
4.On the MCDU:
On the MCDU:
  • Push the line key adjacent to the RETURN indication until the MCDU MENU page comes into view.
  • The MCDU goes back to the main menu.
Subtask 34-42-00-740-051-F ** ON A/C NOT FOR ALL
A. BITE Test
NOTE: - During the test, you can hear auto call out announcements 40
- You must open the RA1 circuit breaker to hear auto call out announcements during the RA2 SYSTEM TEST.
ACTION
RESULT
1.On the MCDU:

  • Get the RA1 (RA2) page then push the line key adjacent to the SYSTEM TEST indication.
On the CAPT (F/O PFD):
  • The bottom sector line moves down from the horizon line
  • The radio altitude indication is 40 ft.
  • Push the line key adjacent to the YES indication.
The TEST OK message comes into view.
  • Push the line key adjacent to the RETURN indication.
On the CAPT (F/O PFD):
  • The bottom sector line moves up to the horizon line
  • The radio altitude indication is O ft. On the MCDU, the RA1 (RA2) page comes into view.
5. Close-up
Subtask 34-42-00-860-055-A
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) On the center pedestal, on the MCDU, push the line key adjacent to the RETURN indication until the MCDU MENU page comes into view.
   (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.
[Rev.10 from 2021] 2026.04.01 01:01:30 UTC
"Aviabrain" 2025