BITE Test of the Radio Altimeter A320
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.
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 |
| Ref. 24-41-00-861-002-A | Energize the Aircraft Electrical Circuits from the External Power |
| Ref. 24-41-00-861-002-A01 | Energize the Aircraft Electrical Circuits from the APU |
| Ref. 24-41-00-861-002-A02 | Energize the Aircraft Electrical Circuits from Engine 1(2) |
| Ref. 24-41-00-862-002-A | De-energize the Aircraft Electrical Circuits Supplied from the External Power |
| Ref. 24-41-00-862-002-A01 | De-energize the Aircraft Electrical Circuits Supplied from the APU |
| Ref. 24-41-00-862-002-A02 | De-energize the Aircraft Electrical Circuits Supplied from the Engine 1(2) |
| Ref. 31-32-00-860-010-A | Procedure to Get Access to the SYSTEM REPORT/TEST NAV Page |
| Ref. 31-60-00-860-001-A | EIS Start Procedure |
| Ref. 31-60-00-860-002-A | EIS Stop Procedure |
| Ref. 34-10-00-860-002-A | ADIRS Start Procedure |
| Ref. 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:
| PANEL | DESIGNATION | FIN | LOCATION |
| 121VU | COM NAV/RAD ALTM/2 | 1SA2 | K12 |
| 121VU | COM NAV/RAD ALTM/1 | 1SA1 | K11 |
4. Procedure
SUBTASK 34-42-00-740-051-E
- 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.
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.
