W DOC AIRBUS | TSM A320F

Self-Test Function of the GPWS Inoperative

TASK 34-48-00-810-817-A
Self-Test Function of the GPWS Inoperative

1. Possible Causes
  • P/BSW-GPWS/G/S [5WZ]
  • wiring of the GPWS/G/S pushbutton switch (5WZ)
  • P/BSW-GPWS/G/S [4WZ]
  • wiring of the GPWS/G/S pushbutton switch (4WZ)
  • GPWC [1WZ]
  • wiring of the SELF TEST discrete from the GPWC (1WZ) to the first terminal block
  • wiring of the PULL UP/GPWS pushbutton switch (5WZ):
  • wiring of the PULL UP/GPWS pushbutton switch (4WZ)
2. Job Set-up Information
 A. Referenced Information
REFERENCE
DESIGNATION
ESPM 2045110
AMM 34-48-00-710-001
Operational Test of GPWS Ground Self-test Function
ASM 344801
AMM 34-48-34-000-001
Removal of the GPWC
AMM 34-48-34-400-001
Installation of the GPWC
3. Fault Confirmation
Subtask 34-48-00-710-058-B
A. Test
   (1) Do the operational test of Enhanced GPWS ground self-test function AMM 34-48-00-710-001.
4. Fault Isolation
Subtask 34-48-00-810-069-A ** ON A/C NOT FOR ALL
A. If the self-test of the GPWS is inoperative:
  • do a check of the GPWS/G/S pushbutton switches.
   (1) If the CAPT GPWS/G/S pushbutton switch is inoperative:
     (a) If the fault continues:
  • do a check and repair the wiring of the GPWS/G/S pushbutton switch (5WZ):
    . pin A/D1 to the first terminal block
    . pin A/D3 to the ground point
    ASM 344801.
   (2) If the F/O GPWS/G/S pushbutton switch is inoperative:
     (a) If the fault continues:
  • do a check and repair the wiring of the GPWS/G/S pushbutton switch (4WZ):
    . pin A/D1 to the first terminal block
    . pin A/D3 to the ground point
    ASM 344801.
   (3) If the two GPWS/G/S pushbutton switches are inoperative:
     (a) If the fault continues:
  • do a check and repair the wiring of the SELF TEST discrete from the GPWC (1WZ) to the first terminal block ASM 344801.
Subtask 34-48-00-810-069-D ** ON A/C NOT FOR ALL
A. If the self-test of the GPWS is inoperative:
  • do a check of the PULL UP/GPWS pushbutton switches.
   (1) If the CAPT PULL UP/GPWS pushbutton switch is inoperative:
     (a) If the fault continues:
  • do a check and repair the wiring of the PULL UP/GPWS pushbutton switch (5WZ)::
    . pin A/D1 to the first terminal block
    . pin A/D3 to the ground point
    ASM 344801.
   (2) If the F/O PULL UP/GPWS pushbutton switch is inoperative:
     (a) If the fault continues:
  • do a check and repair the wiring of the PULL UP/GPWS pushbutton switch (4WZ):
    . pin A/D1 to the first terminal block
    . pin A/D3 to the ground point
    ASM 344801.
   (3) If the two PULL UP/GPWS pushbutton switches are inoperative:
     (a) If the fault continues:
  • do a check and repair the wiring of the SELF TEST discrete from the GPWC (1WZ) to the first terminal block ASM 344801.
Subtask 34-48-00-710-059-A
B. Do the test given in Para. 3.
[Rev.8 from Aug 2018] 2026.04.04 04:33:15 UTC
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