- do a check of the wiring of the ATH OWN ENGD MON OWN discrete

 on the FMGC 1 (1CA1) (from pin AE/12E to pin AE/1F) (Ref. ASM 22-31/01).
 1 If there is no continuity:
_ - repair the above wiring.
 2 If there is continuity:
_
 - replace the FCU (2CA) (Ref. AMM TASK 22-81-12-000-001) and (Ref. AMM TASK 22-81-12-400-001).
 a If the fault continues:
_
 - do a check and repair the wiring of the A/THR 1 SW MON discrete from the FCU (2CA) to the FMGC 1 (1CA1) (Ref. ASM 22-31/01).
 B. If the A/THR does not engage when you open the circuit breaker 10CA1 only:
 - do the operational test of the AFS (Ref. AMM TASK 22-96-00-710-001) and read the result for the FMGC 2.
 (1) If the test gives the maintenance message AFS : FMGC 2/ATHR DISC CKT:

 - do a check and repair the wiring of the ATH INST DISC NO and ATH INST DISC NC discretes (from the FMGC 2 (1CA2) to the first terminal block) (Ref. ASM 22-31/01).

 (2) If the test gives the message LRU TEST NOT COMPLETED:

 - push the line key adjacent to the RETURN indication until the AFS MAIN MENU page comes into view

 - push the line key adjacent to the TROUBLE SHOOTING DATA indication

 - push the line key adjacent to the FG 2 COM indication, then FG 2 MON indication: . make sure that there is a snapshot related to an event 1 at AFS TEST time

 - on word 5, make sure that the third number is equal to: . 1 or 3 or 5 or 7 or 9 or B or D or F (on command and monitoring channels).
 (a) If the third number is not equal to the above values on the command channel:
 - do a check of the wiring of the ATH OWN ENGD COM OPP discrete on the FMGC 2 (1CA2) (from pin AA/14D to pin AB/1D)
 「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1 EFF : ALL ∞∞22-31-00∞∞∞∞∞∞∞∞∞∞Page 208
 Feb 01/98 CES - do a check of the wiring of the ATH OWN ENGD COM OWN discrete

 on the FMGC 2 (1CA2) (from pin AB/12D to pin AB/1F) (Ref. ASM 22-31/01).
 1 If there is no continuity:
_ - repair the above wiring.
 2 If there is continuity:
_
 - replace the FCU (2CA) (Ref. AMM TASK 22-81-12-000-001) and (Ref. AMM TASK 22-81-12-400-001).
 a If the fault continues:
_
 - do a check and repair the wiring of the A/THR 2 SW COM discrete from the FCU (2CA) to the FMGC 2 (1CA2) (Ref. ASM 22-31/01).
 (b) If the third number is not equal to the above values on the monitor channel:
 - do a check of the wiring of the ATH OWN ENGD MON OPP discrete on the FMGC 2 (1CA2) (from pin AD/14F to pin AE/1D)

 - do a check of the wiring of the ATH OWN ENGD MON OWN discrete

 on the FMGC 2 (1CA2) (from pin AE/12E to pin AE/1F) (Ref. ASM 22-31/01).
 1 If there is no continuity:
_ - repair the above wiring.
 2 If there is continuity:
_
 - replace the FCU (2CA) (Ref. AMM TASK 22-81-12-000-001) and (Ref. AMM TASK 22-81-12-400-001).
 a If the fault continues:
_
 - do a check and repair the wiring of the A/THR 2 SW MON discrete from the FCU (2CA) to the FMGC 2 (1CA2) (Ref. ASM 22-31/01).
 C. Do the test given in Para. 3.C.(2).
 5. Close-up
________
 A. Put the aircraft back to its initial configuration.
 (1) De-energize the aircraft electrical circuits
 (Ref. AMM TASK 24-41-00-862-002).

 A/THR Pushbutton Switch does not Come on at A/THR Engagement
 1. Possible Causes
_______________
 - FCU (2CA)

 - wiring of the A/THR 2 SW MON and A/THR 2 SW COM discretes (from the FCU (2CA) to the first terminal block)

 - wiring of the A/THR 1 SW MON and A/THR 1 SW COM discretes (from the FCU (2CA) to the first terminal block)

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
R AMM 22-81-12-000-001 Removal of the FCU (2CA) AMM 22-81-12-400-001 Installation of the FCU (2CA) AMM 24-41-00-861-002 Energize the Aircraft Electrical Circuits from the
 External Power AMM 24-41-00-862-002 De-energize the Aircraft Electrical Circuits Supplied from the External Power ASM 22-31/01
 3. Fault Confirmation
__________________
 A. Job Set-up
 (1) Aircraft Maintenance Configuration
 (a) Energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-861-002).
 B. Make sure that this(these) circuit breaker(s) is(are) closed:
　
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