Loss of Qualifiers B1/B2 on the Weather Radar Transceiver 1

TASK 34-41-00-810-850-A
Loss of Qualifiers B1/B2 on the Weather Radar Transceiver 1

1. Possible Causes

XCVR-WEATHER RADAR, 1 [1SQ1]
wiring between the weather radar transceiver 1 and the EIU-1
wiring between the weather radar transceiver 1 and the EIU-2
diode module 1805VD
diode module 1802VD

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
ASM 344100
AMM 34-41-00-740-002	BITE Test of the Weather Radar
AMM 34-41-33-000-004	Removal of the Weather Radar Transceiver
AMM 34-41-33-400-003	Installation of the Weather Radar Transceiver

3. Fault Confirmation
Subtask 34-41-00-740-138-A ** ON A/C NOT FOR ALL

A. Test
Do the BITE test of the weather radar (system 1) AMM 34-41-00-740-002

4. Fault Isolation
Subtask 34-41-00-810-113-A ** ON A/C NOT FOR ALL

A. If the test gives the maintenance message QUALIFIER B1/2WXR1(1SQ1):
(1) Replace the XCVR-WEATHER RADAR, 1 [1SQ1] AMM 34-41-33-000-004 and AMM 34-41-33-400-003.
(2) If the fault continues:

do a check and repair the wiring between the weather radar transceiver 1 and the EIU-1 ASM 344100 : pin AB/11B and pin AB/7A
do a check and repair the wiring between the weather radar transceiver 1 and the EIU-2 ASM 344100 : pin AB/12B and pin AB/7A.

(3) If the fault continues:

do a check and repair the diode module 1805VD : pin A/25 and pin A/10
do a check and repair the diode module 1802VD : pin A/44 and pin A/43.

(4) If the fault continues:

refer to the trouble shooting procedures of the EIUs.

Subtask 34-41-00-740-139-A ** ON A/C NOT FOR ALL

B. Do the test given in Para. 3.

5. Close-up
Subtask 34-41-00-860-050-A ** ON A/C NOT FOR ALL

A. Put the Aircraft back to its Initial Configuration

[Rev.8 from Aug 2018] 2026.04.04 04:33:07 UTC