Result of the BITE Test of the Weather Radar 1 not Satisfactory on CAPT ND/PFD

TASK 34-41-00-810-838-A
Result of the BITE Test of the Weather Radar 1 not Satisfactory on CAPT ND/PFD

1. Possible Causes

DMC-1 [1WT1]
XCVR-WEATHER RADAR, 1 [1SQ1]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 31-63-34-000-001	Removal of the DMC
AMM 31-63-34-400-001	Installation of the DMC
AMM 34-41-00-740-002	BITE Test of the Weather Radar
ASM 344101
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 34-41-00-740-114-A

A. Test
(1) Do the BITE test of the weather radar 1 with the EIS DMC selector switch on the SWITCHING panel 8VU in CAPT/3 position AMM 34-41-00-740-002.

4. Fault Isolation
Subtask 34-41-00-810-097-A

A. If the test result is satisfactory:
(1) Replace the DMC-1 [1WT1] AMM 31-63-34-000-001 and AMM 31-63-34-400-001.
(2) If the fault continues:

do a check of the wiring between DMC1 (1WT1) pins AA/12A, 12B and terminal block 1851VT39 pins A, F and between DMC1 (1WT1) pins AA/12C, 12D and terminal block 1851VT38 pins F, A ASM 344101.

Subtask 34-41-00-810-098-A

B. If the test gives the maintenance message DMC1/2/3(1WT1/2/3)/WXR1(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 of the wiring between weather radar transceiver 1 (1SQ1) pins AB/2D, 3D and terminal block 1851VT39 pins D, J and between weather radar transceiver 1 (1SQ1) pins AB/2G, 3G and terminal block 1851VT38 pins J, D ASM 344101.

5. Close-up
Subtask 34-41-00-740-115-A

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

[Rev.8 from Aug 2018] 2026.04.04 04:33:06 UTC