W DOC AIRBUS | AMM A320F

Warning Test of the Radio Altimeter

TASK 34-42-00-710-001-A
Warning 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
Test of the operation of the RA warning.
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 27-80-00-866-004-A
Extending the Slats on the Ground
TASK 27-80-00-866-005-A
Retracting the Slats on the Ground
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 34-42-00-860-050-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 (Ref. AMM TASK 31-60-00-860-001).
Subtask 34-42-00-865-051-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 34-42-00-710-051-A
A. Test of the Operation of the RA Warning
ACTION
RESULT
1.On the center pedestal:

The slats extend to the position 1.
2.On the rear circuit breaker panel 121VU:

  • Open the circuit breaker 1SA1.
On the CAPT and F/O PFDs:
  • the altitude value previously displayed on F/O PFD comes into view (expected value 0 plus or minus 3 ft).
    On the upper ECAM display unit:
  • The NAV RA1 FAULT indication comes into view.
    On the CAPT and F/O glareshield panels:
  • The MASTER CAUT lights come on.
    In the loud speakers:
  • You can hear the single chime
  • Open the circuit breaker 1SA2.
On the CAPT and F/O PFDs:
  • The altitude previously displayed goes out of view.
  • The RA warning comes into view.
    On the upper ECAM display unit:
  • The NAV RA1 FAULT indication stays in view.
  • The NAV RA2 FAULT indication comes into view.
    On the CAPT and F/O glareshield panels:
  • The MASTER CAUT lights stay on.
    In the loud speakers:
  • you can hear the single chime.
3.On the rear circuit breaker panel 121VU:

  • Close the circuit breakers 1SA1 and 1SA2.
On the CAPT and F/O PFDs:
  • The RA warning goes out of view after 15 seconds.
  • The altitude 0 ft. comes into view. On the upper ECAM display unit:
  • The NAV RA1 FAULT and NAV RA2 FAULT indications go out of view.
5. Close-up
Subtask 34-42-00-860-051-A
A. Put the aircraft back to its initial configuration.
   (1) Do the EIS stop procedure (Ref. AMM TASK 31-60-00-860-002).
   (2) Put the aircraft in clean configuration (Ref. AMM TASK 27-80-00-866-005).
   (3) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).
   (4) Make sure that the work area is clean and clear of tools and other items.
[Rev.10 from 2021] 2026.04.02 06:23:23 UTC
"WTRUIB" 2025