4. Fault Isolation
_______________

 **ON A/C 001-049, 051-099, 101-105, 151-199, 201-214,
 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:

 - replace the P/BSW - GPWS/G/S (5WZ) (Ref. AMM TASK 33-10-00-000-002) and (Ref. AMM TASK 33-10-00-400-002).
 (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 (Ref. ASM 34-48/01).

 (2) If the F/O GPWS/G/S pushbutton switch is inoperative:

 - replace the P/BSW - GPWS/G/S (4WZ) (Ref. AMM TASK 33-10-00-000-002) and (Ref. AMM TASK 33-10-00-400-002).
 (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 (Ref. ASM 34-48/01).

 (3) If the two GPWS/G/S pushbutton switches are inoperative:

 - replace the GPWC (1WZ) (Ref. AMM TASK 34-48-34-000-001) and (Ref. AMM TASK 34-48-34-400-001).
 (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 (Ref. ASM 34-48/01).
R **ON A/C 106-149, 215-299, 301-399, 401-499,
 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:
 - replace the P/BSW - PULL UP/GPWS (5WZ) (Ref. AMM TASK 33-10-00-000-002) and (Ref. AMM TASK 33-10-00-400-002).
 (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
 「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 ∞∞34-48-00∞∞∞∞∞∞∞∞∞∞Page 235
 Aug 01/05 CES

R  . pin A/D3 to the ground point 
R  (Ref. ASM 34-48/01). 
R  (2) If the F/O PULL UP/GPWS pushbutton switch is inoperative: 
R  - replace the P/BSW - PULL UP/GPWS (4WZ) (Ref. AMM TASK 33-10-00-000-
R  002) and (Ref. AMM TASK 33-10-00-400-002). 
R  (a) If the fault continues: 
R  - do a check and repair the wiring of the PULL UP/GPWS pushbutton 
R  switch (4WZ): 
R  . pin A/D1 to the first terminal block 
R  . pin A/D3 to the ground point 
R  (Ref. ASM 34-48/01). 
R  (3) If the two PULL UP/GPWS pushbutton switches are inoperative: 
R  - replace the GPWC (1WZ) (Ref. AMM TASK 34-48-34-000-001) and (Ref. 
R  AMM TASK 34-48-34-400-001). 
R  (a) If the fault continues: 
R  - do a check and repair the wiring of the SELF TEST discrete from 
R  the GPWC (1WZ) to the first terminal block (Ref. ASM 34-48/01). 
R  **ON A/C ALL
 B. Do the test given in Para. 3.

 Permanent Inhibition of the Glide Slope Mode Impossible
 1. Possible Causes
_______________
 - GPWC (1WZ)

 - P/BSW - GPWS/G/S MODE (11WZ)

 - wiring of the GPWS/G/S MODE pushbutton switch (11WZ)

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 33-10-00-000-002 Removal of the Bulbs and the Body of a Pushbutton Switch in the Cockpit AMM 33-10-00-400-002 Installation of the Bulbs and the Body of a
 Pushbutton Switch in the Cockpit AMM 34-48-34-000-001 Removal of the GPWC (1WZ) AMM 34-48-34-400-001 Installation of the GPWC (1WZ) ASM 34-48/01
 3. Fault Confirmation
__________________
 A. Test
 Not applicable, you cannot confirm this fault on the ground.

 4. Fault Isolation
_______________
 A. If permanent inhibition of the glide slope mode is inoperative:
 - replace the GPWC (1WZ) (Ref. AMM TASK 34-48-34-000-001) and (Ref. AMM TASK 34-48-34-400-001).
 (1) If the fault continues:
 - replace the P/BSW - GPWS/G/S MODE (11WZ) (Ref. AMM TASK 33-10-00-000-002) and (Ref. AMM TASK 33-10-00-400-002).
 (a) If the fault continues:
 - do a check and repair the wiring of the GPWS/G/S MODE pushbutton switch (11WZ): . pin A/B3 to the ground point . pin A/B1 to GPWC (1WZ) pin AB/1B (Ref. ASM 34-48/01).
　
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