(2) Do the ADIRS start procedure (Ref. AMM TASK 34-10-00-860-002)

 (3) On the EFIS control panel of the FCU:

 - set the mode selector switches to ARC

 (4) on the center pedestal, on the WEATHER RADAR CONTROL-UNIT (3SQ), start the weather radar system.

 (5) On the FO EFIS switching panel 500VU:

 - make sure that the FO ND potentiometer (8WT2) is in the center position.
 B. Make sure that this(these) circuit breaker(s) is(are) closed:
 -------------------------------------------------------------------------------
PANEL DESIGNATION IDENT. LOCATION
 -------------------------------------------------------------------------------
**ON A/C 051-099,
 121VU COM NAV/RADAR/2 5SQ2 K14 R **ON A/C 051-099, 401-499,
 121VU COM NAV/RADAR/1 5SQ1 K13
 C. Test
 Do the EIS system test (Ref. AMM TASK 31-60-00-740-004)

 D. Put the aircraft back to its initial configuration.
 (1) Do the ADIRS stop procedure (Ref. AMM TASK 34-10-00-860-005)

 (2) De-energize the aircraft electrical circuits
 (Ref. AMM TASK 24-41-00-862-002)

 4. Fault Isolation
_______________
 **ON A/C 051-099,

 A. If the test gives the maintenance message WXR1(1SQ1)/WXR2(1SQ2)/DU ND FO(3WT2)/DMC2 (1WT2):
 - replace the DMC-2 (1WT2) (Ref. AMM TASK 31-63-34-000-001) (Ref. AMM TASK 31-63-34-400-001)
 「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1R EFF : 051-099, 401-499, ∞∞31-63-81∞∞∞∞∞∞∞∞∞∞Page B204
 Aug 01/05 CES

 (1) If the fault continues:

 - replace the ND-F/O (3WT2) (Ref. AMM TASK 31-63-22-000-001) (Ref. AMM TASK 31-63-22-400-001)

 (2) If the fault continues:

 - replace the XCVR-WEATHER RADAR, 1 (1SQ1) and the XCVR-WEATHER RADAR, 2 (1SQ2) (Ref. AMM TASK 34-41-33-000-004) (Ref. AMM TASK 34-41-33-400-003)

 (3) If the fault continues:

 - remove the DMC2 (1WT2) (Ref. AMM TASK 31-63-34-000-001)

 - remove the FO ND DU (3WT2) (Ref. AMM TASK 31-63-22-000-001)

 - remove the WEATHER RADAR-XCVR1 (1SQ1) and the WEATHER RADAR-XCVR2 (1SQ2) (Ref. AMM TASK 34-41-33-000-004)

 (a) Check the wiring of the WXR1 OUTPUT BUS from the DMC2 (1WT2) pins AB/14B, 14C to the FO ND DU (3WT2) (Ref. ASM 31-61/00)

 (b) Check the wiring between the DMC2 (1WT2) and the WEATHER RADAR-XCVR 1 (1SQ1) and the WEATHER RADAR-XCVR 2 (1SQ2) (Ref. ASM 31-62/00) (Ref. ASM 34-41/00)

 - install the DMC2 (1WT2) (Ref. AMM TASK 31-63-34-400-001)

 - install the FO ND DU (3WT2) (Ref. AMM TASK 31-63-22-400-001)

 - install the WEATHER RADAR-XCVR 1 (1SQ1) and the WEATHER RADAR-XCVR 2 (1SQ2) (Ref. AMM TASK 34-41-33-400-003)

R **ON A/C 401-499,
 A. If the test gives the maintenance message WXR1(1SQ1)/DU ND FO(3WT2)/DMC2 (1WT2):
 - replace the DMC-2 (1WT2) (Ref. AMM TASK 31-63-34-000-001) (Ref. AMM TASK 31-63-34-400-001)
 (1) If the fault continues:

 - replace the ND-F/O (3WT2) (Ref. AMM TASK 31-63-22-000-001) (Ref. AMM TASK 31-63-22-400-001)

 (2) If the fault continues:

 - replace the XCVR-WEATHER RADAR, 1 (1SQ1) (Ref. AMM TASK 34-41-33-000-004) (Ref. AMM TASK 34-41-33-400-003)

 (3) If the fault continues:

 - remove the DMC2 (1WT2) (Ref. AMM TASK 31-63-34-000-001)

 - remove the FO ND DU (3WT2) (Ref. AMM TASK 31-63-22-000-001)

 - remove the WEATHER RADAR-XCVR1 (1SQ1) (Ref. AMM TASK 34-41-33-000-004)

 (a) Check the wiring of the WXR1 OUTPUT BUS from the DMC2 (1WT2) pins AB/14B, 14C to the FO ND DU (3WT2) (Ref. ASM 31-61/00)
 「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1R EFF : 051-099, 401-499, ∞∞31-63-81∞∞∞∞∞∞∞∞∞∞Page B205
 Aug 01/05 CES

 (b) Check the wiring between the DMC2 (1WT2) and the WEATHER RADAR-XCVR 1 (1SQ1) (Ref. ASM 31-62/00) (Ref. ASM 34-41/00)
 - install the DMC2 (1WT2) (Ref. AMM TASK 31-63-34-400-001)

 - install the FO ND DU (3WT2) (Ref. AMM TASK 31-63-22-400-001)

 - install the WEATHER RADAR-XCVR1 (1SQ1) (Ref. AMM TASK 34-41-33-400-003)

R **ON A/C 051-099, 401-499,
 B. Do the test given in Para. 3.A.

 Loss of the Weather Radar Picture detected by DMC 3 when the ND is shown on the FO ND DU
 1. Possible Causes
_______________
 - DMC-3 (1WT3)

 - ND-F/O (3WT2)

 - XCVR-WEATHER RADAR, 1 (1SQ1)
　
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