1. Possible Causes
_______________
- GPWC (1WZ)
- wiring of the GLIDE SLOPE MANUAL INHIBIT discrete from the GPWC (1WZ) to the first terminal block
2. Job Set-up Information
______________________
A. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
34-48-00-810-817 Self-Test Function of the GPWS Inoperative AMM 34-48-00-710-001 Operational Test of Enhanced GPWS Ground Self-test
Function
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
__________________
**ON A/C 001-049, 051-099, 101-105, 151-199, 201-214,
A. Test
(1) Do the operational test of Enhanced GPWS ground self-test function (Ref. AMM TASK 34-48-00-710-001).
(2) Make sure that you can do the test with the two GPWS/G/S pushbutton switches (4WZ and 5WZ).
R **ON A/C 106-149, 215-299, 301-399, 401-499,
A. Test
(1) Do the operational test of Enhanced GPWS ground self-test function (Ref. AMM TASK 34-48-00-710-001).
(2) Make sure that you can do the test with the two PULL UP/GPWS pushbutton switches (4WZ and 5WZ).
4. Fault Isolation
_______________
A. Do the procedure:
(1) If the test is not possible with one or two pushbutton switches:
- refer to the procedure (Ref. TASK 34-48-00-810-817).
(2) If the test is possible with the two pushbutton switches and inhibition is not possible:
- 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 GLIDE SLOPE MANUAL INHIBIT discrete from the GPWC (1WZ) to the first terminal block (Ref. ASM 34-48/01).
B. Do the test given in Para. 3. R
The OFF Legend of the GPWS/G/S MODE Pushbutton Switch Does not Come on
1. Possible Causes
_______________
- wiring of the GPWS/G/S MODE pushbutton switch (11WZ)
- P/BSW-GPWS/G/S MODE (11WZ)
2. Job Set-up Information
______________________
A. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
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 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 ASM 34-48/01
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:
-------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------
122VU LIGHTING/ANN LT SPLY/XFMR/BUS 1 26LP X04
C. Test On the GPWS section of panel 21VU, push the GPWS/G/S MODE pushbutton switch and make sure that the OFF legend comes on.
4. Fault Isolation
_______________
A. If the OFF legend of the GPWS/G/S MODE pushbutton switch stays off:
- on the panel 25VU, set the INT LT/ANN LT switch to TEST and do a check to see if the OFF legend comes on.
(1) If the OFF legend comes on:
- do a check and repair the wiring of the GPWS/G/S MODE pushbutton switch (11WZ) from pin A/A1 to the ground point (Ref. ASM 34-48/01).
(2) If the OFF legend does not come on:
- 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) from pin A/4 to pin A/A3 (Ref. ASM 34-48/01).
B. Do the test given in Para. 3.C.
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