W DOC AIRBUS | TSM A320F

Continuous Transmission of the VHF 3 Transceiver

TASK 23-12-00-810-812-A
Continuous Transmission of the VHF 3 Transceiver

1. Possible Causes
2. Job Set-up Information
 A. Referenced Information
REFERENCE
DESIGNATION
AMM 23-12-00-710-001
Operational Test of the VHF System
ASM 231203
AMM 23-12-33-000-001
Removal of the VHF Transceiver
AMM 23-12-33-400-001
Installation of the VHF Transceiver
ASM 235102
ASM 235103
ASM 235104
AWM 235105
ASM 235106
AWM 235106
AIPC 235108
AMM 23-51-12-000-001
Removal of the Audio Control Panel (ACP) (2RN1, 2RN2, 2RN3, 2RN4, 2RN5)
AMM 23-51-12-400-001
Installation of the Audio Control Panel (ACP) (2RN1, 2RN2, 2RN3, 2RN4, 2RN5)
AMM 23-51-34-000-001
Removal of the Audio Management Unit (AMU) (1RN)
AMM 23-51-34-400-001
Installation of the Audio Management Unit (AMU) (1RN)
AMM 27-92-41-000-010
Removal of the Radio PTT Switch
AMM 27-92-41-000-802
Removal of the New-Generation Side-Stick Unit
AMM 27-92-41-400-010
Installation of the Radio PTT Switch
AMM 27-92-41-400-802
Installation of the New-Generation Side-Stick Unit
AMM 27-92-41-860-801
Identification of the Side Stick Installed on the Aircraft
AMM 31-55-34-000-001
Removal of the SDAC
AMM 31-55-34-400-001
Installation of the SDAC
3. Fault Confirmation
Subtask 23-12-00-710-054-E
A. Test
Do the operational test of the VHF system AMM 23-12-00-710-001.
NOTE: Do the transmission test for more than 30 s and less than 40 s to see the ECAM warning on the upper ECAM DU.
(The COM VHF 3 EMITTING message comes into view after 30 s of continuous transmission. It is then replaced by the COM SINGLE PTT STUCK message after 40 s of continuous transmission).
NOTE: Do this test at each crew station to find which station is related with the failure.
NOTE: Do this test for the VHF 3 system only.
NOTE: At the end of the test (before you do the fault isolation procedure), make sure that these controls are not in the transmit position:
  • The VHF 3 transmission pushbutton switch on an audio control panel
  • A radio PTT switch on one of the two side sticks
  • A radio PTT pushbutton switch
  • A hand mike selector.
Subtask 23-12-00-875-061-A
B. Table of the circuit breakers used in this procedure:
PANELDESIGNATIONFINLOCATION
** ON A/C ALL
49VUFWS/FWC1/SPLY3WWF01
** ON A/C NOT FOR ALL
121VUCOM NAV/VHF/32RC3L05
** ON A/C ALL
121VUEIS/FWC2/SPLY2WWQ07
** ON A/C NOT FOR ALL
121VUCOM/VHF/32RC3L05
Subtask 23-12-00-810-065-E
C. Open this(these) circuit breaker(s):
C/B-FWS/FWC1/SPLY [3WW] and C/B-EIS/FWC2/SPLY [2WW] .
Close this(these) circuit breaker(s):
C/B-FWS/FWC1/SPLY [3WW] and C/B-EIS/FWC2/SPLY [2WW] .

NOTE: Only a FWC reset (or during the transition of the flight phases 1 or 10) will clear the COM SINGLE PTT STUCK ECAM alert.
After 30 s, but before 40 s (period "P"), when the VHF 3 transmission stops, this ECAM warning does not go out of view:
  • COM VHF 3 EMITTING.
    During the same period "P":
  • Push the VHF 3 transmission pushbutton switch (green bars off) (on the ACP of the related station):
   (1) If the above warning goes out of view and the COM SINGLE PTT STUCK message does not come into view (after 40 s):
  • Go to Para. 4.B.
   (2) If the above warning does not go out of view, but is replaced by the COM SINGLE PTT STUCK message (after 40 s):
  • Go to Para. 4.A.
4. Fault Isolation
Subtask 23-12-00-810-067-I
A. The fault is at one of the 3 crew stations.
   (1) If the fault is at the Captain station:
     (a) If the side stick assembly is installed:
  • On plug connector 2181VC-A pins 10 and 15, disconnect the wires which comes from the Captain radio PTT switch (11RV)
  • Do a check for continuity between connector 2181VC-A pins 10 and 15 and AMU (1RN) pins AA/9J, 9K AWM 235105.
       1 If there is continuity between the wires:
NOTE: Only a FWC reset (or during the transition to flight phases 1 or 10) will clear the COM SINGLE PTT STUCK ECAM alert.
         a If the fault continues:
         b If the fault continues:
  • Do a check and repair the wiring between connector 2181VC-A pins 10 and 15 and AMU (1RN) pins AA/9J, 9K AWM 235105.
       2 If there is no continuity between the two pins:
         a If the fault continues:
  • Connect a new hand microphone to the Captain hand microphone receptacle (19RN1) on the panel 17VU.
         b If the fault continues:
         c If the fault continues:
  • Do a check and repair the wiring (between AMU (1RN) pins AA/10F, 10G and pins 1 and 2 of the Captain hand microphone receptacle (19RN1)) AWM 235105.
         d If the fault continues:
     (b) If the new-generation side-stick unit is installed:
  • On plug connector 2189VC-A pins L and M, disconnect the wires which comes from the new-generation side-stick unit (100CE1)
  • Do a check for continuity between connector 2189VC-A pins L and M and AMU (1RN) pins AA/12E, 5B ASM 235102.
       1 If there is continuity between the wires:
NOTE: Only a FWC reset (or during the transition to flight phases 1 or 10) will clear the COM SINGLE PTT STUCK ECAM alert.
         a If the fault continues:
         b If the fault continues:
  • Do a check and repair the wiring between connector 2189VC-A pins L and M and AMU (1RN) pins AA/12E, 5B ASM 235102.
       2 If there is no continuity between the two pins:
         a If the fault continues:
  • Connect a new hand microphone to the Captain hand microphone receptacle (19RN1) on the panel 17VU.
         b If the fault continues:
         c If the fault continues:
  • Do a check and repair the wiring (between AMU (1RN) pins AA/14E, 8E and pins 1 and 2 of the Captain hand microphone receptacle (19RN1)) ASM 235102.
         d If the fault continues:
   (2) If the fault is at the First Officer station:
     (a) If the side stick assembly is installed:
  • On plug connector 2192VC-A pins 10 and 15, disconnect the wires which comes from the F/O radio PTT switch (12RV)
  • Do a check for continuity between connector 2192VC-A pins 10 and 15 and AMU (1RN) pins AA/12J, 12K AWM 235106.
       1 If there is continuity between the wires:
NOTE: Only a FWC reset (or during the transition to flight phases 1 or 10) will clear the COM SINGLE PTT STUCK ECAM alert.
         a If the fault continues:
         b If the fault continues:
  • Do a check and repair the wiring between connector 2192VC-A pins 10 and 15 and AMU (1RN) pins AA/12J, 12K AWM 235106.
       2 If there is no continuity between the two pins:
         a If the fault continues:
  • Connect a new hand microphone to the First Officer hand microphone receptacle (19RN2) on the panel 16VU.
         b If the fault continues:
         c If the fault continues:
  • Do a check and repair the wiring (between AMU (1RN) pins AA/13F, 13G and pins 1 and 2 of the First Officer hand microphone receptacle (19RN2)) AWM 235106.
         d If the fault continues:
     (b) If the new-generation side-stick unit is installed:
  • On plug connector 2180VC-A pins J and K, disconnect the wires which comes from the new-generation side-stick unit (100CE2)
  • Do a check for continuity between connector 2180VC-A pins J and K and AMU (1RN) pins AA/12D, AB/6B ASM 235103.
       1 If there is continuity between the wires:
NOTE: Only a FWC reset (or during the transition to flight phases 1 or 10) will clear the COM SINGLE PTT STUCK ECAM alert.
         a If the fault continues:
         b If the fault continues:
  • Do a check and repair the wiring between connector 2180VC-A pins J and K and AMU (1RN) pins AA/12D, AB/6B ASM 235103
       2 If there is no continuity between the two pins:
         a If the fault continues:
  • Connect a new hand microphone to the First Officer hand microphone receptacle (19RN2) on the panel 16VU.
         b If the fault continues:
         c If the fault continues:
  • Do a check and repair the wiring (between AMU (1RN) pins AA/8B, AB/4H and pins 1 and 2 of the First Officer hand microphone receptacle (19RN2)) ASM 235103.
         d If the fault continues:
   (3) If the fault is at the Third Occupant station:
     (a) If the fault continues:
  • Connect a new hand microphone to the Third Occupant hand microphone receptacle (19RN3) on the panel 62VU.
     (b) If the fault continues:
     (c) If the fault continues:
  • Do a check and repair the wiring (between AMU (1RN) pins AA/1F, 1G and pins 1 and 2 of the Third Occupant hand microphone receptacle (19RN3)) ASM 235104.
     (d) If the fault continues:
Subtask 23-12-00-810-066-A
B. Open the circuit breaker 2RC3 on the panel 121VU, then close it.
   (1) If the fault continues:
  • do a check for ground at the pin AB/1D of the VHF 3 transceiver (1RC3) ASM 231203.
     (a) If there is no ground signal at this pin:
  • do a check and repair the wiring from VHF 3 transceiver (1RC3) pin AB/1D to the first terminal block ASM 231203.
     (b) If there is a ground signal at this pin:
       1 If the fault continues:
       2 If the fault continues:
       3 If the fault continues:
       4 If the fault continues:
  • do a check and repair the wiring between AMU (1RN) pin AA/3F and VHF 3 transceiver (1RC3) pin AB/1C ASM 235106
Subtask 23-12-00-710-055-A
C. Do the test given in Para. 3.
[Rev.8 from Aug 2018] 2026.04.04 04:25:37 UTC
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