Loss of the Weather Radar 1 Discrete Input of the GPWC

TASK 34-48-00-810-839-A
Loss of the Weather Radar 1 Discrete Input of the GPWC

1. Possible Causes

GPWC [1WZ]
CTL UNIT-WEATHER RADAR [3SQ]
wiring of the WEATHER RADAR 1 ON/OFF discrete between the CTL UNIT-WEATHER RADAR and the GPWC

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 34-41-12-000-001	Removal of the Weather Radar Control Unit
AMM 34-41-12-400-001	Installation of the Weather Radar Control Unit
AMM 34-48-00-740-002	BITE Test of the GPWS
ASM 344802
AMM 34-48-34-000-001	Removal of the GPWC
AMM 34-48-34-400-001	Installation of the GPWC

3. Fault Confirmation
Subtask 34-48-00-740-090-A

A. Test
(1) Do the BITE test of the Enhanced GPWS AMM 34-48-00-740-002.

4. Fault Isolation
Subtask 34-48-00-810-103-A

A. If the test gives the maintenance message: WXR1 (1SQ1)/GPWC (1WZ)

(1) If the fault continues:

replace the CTL UNIT-WEATHER RADAR [3SQ] AMM 34-41-12-000-001 and AMM 34-41-12-400-001.

(a) If the fault continues:

do a check and repair the wiring of the WEATHER RADAR 1 ON/OFF discrete between the CTL UNIT-WEATHER RADAR and the GPWC: between pin A/V and pin AB/14A ASM 344802.

Subtask 34-48-00-740-091-A

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:33:17 UTC