Loss of the Weather Radar Discrete Input of the Enhanced GPWC

TASK 34-48-00-810-849-A
Loss of the Weather Radar Discrete Input of the Enhanced GPWC

1. Possible Causes

wiring of the WEATHER RADAR 1 ON/OFF discrete between the Enhanced GPWC (1WZ) and the weather radar control unit (3SQ)
CTL UNIT-WEATHER RADAR [3SQ]
GPWC [1WZ]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
ASM 344101
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
AMM 34-48-34-000-001	Removal of the GPWC
AMM 34-48-34-400-001	Installation of the GPWC

3. Fault Confirmation
Subtask 34-48-00-740-110-A ** ON A/C NOT FOR ALL

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

4. Fault Isolation
Subtask 34-48-00-810-113-A ** ON A/C NOT FOR ALL

A. If the BITE test gives the maintenance message WXR CONTROL PANEL(3SQ)/GPWC(1WZ):

do a check and repair the wiring of the WEATHER RADAR 1 ON/OFF discrete between the Enhanced GPWC (1WZ) and the weather radar control unit (3SQ): between pin AB/14A and pin AA/V ASM 344101.

(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:

Subtask 34-48-00-740-111-A ** ON A/C NOT FOR ALL

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:33:18 UTC