Loss of the Weather Radar 2 Input Data

TASK 34-48-00-810-842-A
Loss of the Weather Radar 2 Input Data

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 34-41-33-000-004	Removal of the Weather Radar Transceiver
AMM 34-41-33-400-003	Installation of the Weather Radar Transceiver
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 34-48-00-740-096-A ** ON A/C NOT FOR ALL

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

4. Fault Isolation
Subtask 34-48-00-810-106-A ** ON A/C NOT FOR ALL

A. If the test gives the maintenance message: WXR2 (1SQ2) BUS HAZARD/GPWC (1WZ)

If the second weather radar transceiver is not installed:
. On the center pedestal, on the weather radar control unit, set the SYS switch to 1. The message goes out of view.
If the second weather radar transceiver is installed:
. Replace [1SQ2] AMM 34-41-33-000-004 and AMM 34-41-33-400-003.

(1) If the fault continues:
(a) Do a check and repair the wiring of the weather radar 2 DATA INPUT bus between:

Pins AB/6C, AB/6D of the GPWC and pins AB/5J, AB/6J of weather radar transceiver 2 (1SQ2) ASM 344802.

1 If the fault continues:

Subtask 34-48-00-740-097-A ** ON A/C NOT FOR ALL

B. Do the test given in Para. 3.

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