Loss of the Weather Radar channel 2 bus iIdentified by the EIS 3

TASK 34-41-00-810-809-A
Loss of the Weather Radar channel 2 bus iIdentified by the EIS 3

1. Possible Causes

XCVR-WEATHER RADAR, 1 [1SQ1]
wiring

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 31-60-00-740-002	Perform Electronic Instrument System (EIS) Input Test
AMM 31-60-00-740-004	EIS System Test
ASM 344101
AMM 34-41-33-000-004	Removal of the Weather Radar Transceiver
AMM 34-41-33-000-802	Removal of the Weather Radar Transceiver
AMM 34-41-33-400-003	Installation of the Weather Radar Transceiver
AMM 34-41-33-400-802	Installation of the Weather Radar Transceiver

3. Fault Confirmation
Subtask 34-41-00-865-057-A

A. Make sure that this(these) circuit breaker(s) is(are) closed:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
121VU	COM NAV/RADAR/1	5SQ1	K13

Subtask 34-41-00-740-064-A ** ON A/C NOT FOR ALL

B. Test
(1) Do the EIS input test AMM 31-60-00-740-002.

Subtask 34-41-00-740-064-B ** ON A/C NOT FOR ALL

B. Test
Do the EIS system test AMM 31-60-00-740-004.

4. Fault Isolation
Subtask 34-41-00-810-061-A

A. If the test gives the maintenance message DMC3 : NO WXR 2 DATA or DMC3 : NO WXR1 CH2 DATA :
(1) on the weather radar control unit (3SQ), do a check of the position of the system selector switch.
(a) If the weather radar system 1 is set:

replace the XCVR-WEATHER RADAR, 1 [1SQ1] AMM 34-41-33-000-004 AMM 34-41-33-000-802 and AMM 34-41-33-400-003 AMM 34-41-33-400-802.

(b) If the weather radar system 2 is set:

do a check and repair the wiring of the TR1 DATA BUS 2 OUTPUT bus from the weather radar transceiver 1 (1SQ1) to the first terminal block ASM 344101.

Subtask 34-41-00-740-065-A

B. Do the test given in Para. 3.B.

[Rev.8 from Aug 2018] 2026.04.04 04:33:05 UTC