W DOC AIRBUS | TSM A320F

A/THR Instinctive Disconnect Pushbutton Switch Inoperative

TASK 22-31-00-810-807-A
A/THR Instinctive Disconnect Pushbutton Switch Inoperative

1. Possible Causes
  • LEVER ASSEMBLY-THROTTLE CONTROL, L [211VU]
  • wiring of the CAPT A/THR instinctive disconnect pushbutton switch (7CA1)
  • LEVER ASSEMBLY-THROTTLE CONTROL, R [210VU]
  • wiring of the F/O A/THR instinctive disconnect pushbutton switch (7CA2)
  • RELAY-A/THR1 INST DISC [5CA1]
  • wiring of the relay (5CA1)
  • diode module (1803VD)
  • wiring of the diode module (1803VD)
  • P/BSW-A/THR INST DISC, CAPT [7CA1]
  • P/BSW-A/THR INST DISC, F/O [7CA2]
  • RELAY-A/THR2 INST DISC [5CA2]
  • wiring of the relay (5CA2)
2. Job Set-up Information
 A. Referenced Information
REFERENCE
DESIGNATION
TSM TASK 22-83-00-810-827-A
Loss of the Reception of the ATH INST DISC Discretes by the FMGC 1
TSM TASK 22-83-00-810-828-A
Loss of the Reception of the ATH INST DISC Discretes by the FMGC 2
AMM 22-30-00-710-003
Operational Test of the Engine / Autothrust System Isolation (with AIDS)
ASM 223101
AMM 22-96-00-710-001
Operational Test of the AFS
AMM 76-11-41-000-040
Removal of the Throttle Control Lever Assembly
AMM 76-11-41-000-042
Removal of the Throttle Control Lever Assembly
AMM 76-11-41-400-040
Installation of the Throttle Control Lever Assembly
AMM 76-11-41-400-042
Installation of the Throttle Control Lever Assembly
3. Fault Confirmation
Subtask 22-31-00-710-062-A
A. Test
   (1) Do the operational test of the engine/autothrust system isolation AMM 22-30-00-710-003.
4. Fault Isolation
Subtask 22-31-00-810-056-A ** ON A/C NOT FOR ALL
A. If the A/THR disengagement does not operate with the circuit breaker 10CA2 open:
  • do the operational test of the AFS AMM 22-96-00-710-001 with one A/THR instinctive disconnect pushbutton switch pushed and read the result for the FMGC 1.
   (1) If the test gives the maintenance message AFS: FMGC1/ATHR DISC CKT:
   (2) If the test does not give the message and if the A/THR pushbutton switch remains on on the FCU when you push the CAPT A/THR instinctive disconnect pushbutton switch only:
     (a) If the fault continues:
  • do a check and repair the wiring of the CAPT A/THR instinctive disconnect pushbutton switch (7CA1) from pin A/4 to the ground and from pin A/5 to the first terminal block ASM 223101.
   (3) If the test does not give the message and if the A/THR pushbutton switch remains on on the FCU when you push the F/O A/THR instinctive disconnect pushbutton switch only:
     (a) If the fault continues:
  • do a check and repair the wiring of the F/O A/THR instinctive disconnect pushbutton switch (7CA2) from pin A/4 to the ground and from pin A/5 to the first terminal block ASM 223101.
   (4) If the test does not give the message and if the A/THR pushbutton switch remains on on the FCU when you push the two A/THR instinctive disconnect pushbutton switches:
  • replace the RELAY-A/THR1 INST DISC [5CA1] .
     (a) If the fault continues:
  • do a check of the wiring of the relay (5CA1) from pin A/X to the first terminal block and from pin A/Z to the diode module (1803VD) pin A/22 ASM 223101.
       1 If there is no continuity:
  • repair the above wiring.
       2 If there is continuity:
  • replace the diode module (1803VD).
         a If the fault continues:
  • do a check and repair the wiring of the diode module (1803VD) from pin A/7 to the first terminal block ASM 223101.
Subtask 22-31-00-810-056-B ** ON A/C NOT FOR ALL
A. If the A/THR disengagement does not operate with the circuit breaker 10CA2 open:
  • do the operational test of the AFS AMM 22-96-00-710-001 with one A/THR instinctive disconnect pushbutton switch pushed and read the result for the FMGC 1.
   (1) If the test gives the maintenance message AFS: FMGC1/ATHR DISC CKT:
   (2) If the test does not give the message and if the A/THR pushbutton switch remains on on the FCU when you push the CAPT A/THR instinctive disconnect pushbutton switch only:
     (a) If the fault continues:
  • do a check and repair the wiring of the CAPT A/THR instinctive disconnect pushbutton switch (7CA1) from pin A/4 to the ground and from pin A/5 to the first terminal block ASM 223101.
   (3) If the test does not give the message and if the A/THR pushbutton switch remains on on the FCU when you push the F/O A/THR instinctive disconnect pushbutton switch only:
     (a) If the fault continues:
  • do a check and repair the wiring of the F/O A/THR instinctive disconnect pushbutton switch (7CA2) from pin A/4 to the ground and from pin A/5 to the first terminal block ASM 223101.
   (4) If the test does not give the message and if the A/THR pushbutton switch remains on on the FCU when you push the two A/THR instinctive disconnect pushbutton switches:
  • replace the RELAY-A/THR1 INST DISC [5CA1] .
     (a) If the fault continues:
  • do a check of the wiring of the relay (5CA1) from pin A/X to the first terminal block and from pin A/Z to the diode module (1803VD) pin A/22 ASM 223101.
       1 If there is no continuity:
  • repair the above wiring.
       2 If there is continuity:
  • replace the diode module (1803VD).
         a If the fault continues:
  • do a check and repair the wiring of the diode module (1803VD) from pin A/7 to the first terminal block ASM 223101.
Subtask 22-31-00-810-057-A
B. If the A/THR disengagement does not operate with the circuit breaker 10CA1 open:
  • do the operational test of the AFS AMM 22-96-00-710-001 with one A/THR instinctive disconnect pushbutton switch pushed and read the result for the FMGC 2.
   (1) If the test gives the maintenance message AFS: FMGC2/ATHR DISC CKT:
   (2) If the test does not give the message and if the A/THR pushbutton switch remains on on the FCU when you push the CAPT A/THR instinctive disconnect pushbutton switch only:
  • replace the P/BSW-A/THR INST DISC, CAPT [7CA1] .
     (a) If the fault continues:
  • do a check and repair the wiring of the CAPT A/THR instinctive disconnect pushbutton switch (7CA1) from pin A/1 to the ground and from pin A/2 to the first terminal block ASM 223101.
   (3) If the test does not give the message and if the A/THR pushbutton switch remains on on the FCU when you push the F/O A/THR instinctive disconnect pushbutton switch only:
  • replace the P/BSW-A/THR INST DISC, F/O [7CA2] .
     (a) If the fault continues:
  • do a check and repair the wiring of the F/O A/THR instinctive disconnect pushbutton switch (7CA2) from pin A/1 to the ground and from pin A/2 to the first terminal block ASM 223101.
   (4) If the test does not give the message and if the A/THR pushbutton switch remains on on the FCU when you push the two A/THR instinctive disconnect pushbutton switches:
  • replace the RELAY-A/THR2 INST DISC [5CA2] .
     (a) If the fault continues:
  • do a check of the wiring of the relay (5CA2) from pin A/X to the first terminal block and from pin A/Z to the diode module (1803VD) pin A/23 ASM 223101.
       1 If there is no continuity:
  • repair the above wiring.
       2 If there is continuity:
  • replace the diode module (1803VD).
         a If the fault continues:
  • do a check and repair the wiring of the diode module (1803VD) from pin A/8 to the first terminal block ASM 223101.
Subtask 22-31-00-710-063-A
C. Do the test given in Para. 3.
[Rev.8 from Aug 2018] 2026.04.04 04:25:09 UTC
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