DOC AIRBUS | TSM A320FFailure of the Mechanic Call Horn
TASK 23-42-00-810-804-A
Failure of the Mechanic Call Horn
1. Possible Causes
A. Referenced Information
3. Fault Confirmation
Subtask 23-42-00-710-056-A 4. Fault Isolation
Subtask 23-42-00-810-054-A
[Rev.8 from Aug 2018]
2026.04.04 04:25:42 UTC
Failure of the Mechanic Call Horn
1. Possible Causes
- HORN-MECH CALL [15WC]
RELAY-HORN SUPPLY (4WC) P/B SW-CALLS/MECH (1WC) DIODE MODULE (1160VD) - wiring
A. Referenced Information
| REFERENCE | DESIGNATION |
|---|---|
| AMM 23-42-00-710-001 | Operational Test of the Mechanic Call |
| ASM 234201 | |
| AMM 23-42-21-000-001 | Removal of the Mechanic Call Horn |
| AMM 23-42-21-400-001 | Installation of the Mechanic Call Horn |
Subtask 23-42-00-710-056-A 4. Fault Isolation
Subtask 23-42-00-810-054-A
A. If during the operational test the mechanical call horn does not operate:
Subtask 23-42-00-710-057-A - replace the HORN-MECH CALL [15WC] AMM 23-42-21-000-001 and AMM 23-42-21-400-001.
- replace the
RELAY-HORN SUPPLY (4WC) .
- replace the
P/B SW-CALLS/MECH (1WC) .
- do a check of
DIODE MODULE (1160VD) pins 4 and 19 ASM 234201.
- replace the
DIODE MODULE (1160VD)
- do a check and repair the wiring of these components:
. horn (15WC)
. relay (4WC)
. diode module (1160VD)
. pushbutton switch (1WC) ASM 234201.
B. Do the test given in Para. 3.