- ATSU (1TX1)

 - wiring of the DATA LOADER INPUT BUS

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION
 -------------------------------------------------------------------------------
AMM 31-38-22-000-001 Removal of the MDDU (1TD)
 AMM 31-38-22-400-001 Installation of the MDDU (1TD)
 AMM 46-21-00-740-001 BITE Test of the ATIMS
 AMM 46-21-34-000-001 Removal of the Air Traffic Service Unit (ATSU) (1TX1)
 AMM 46-21-34-400-001 Installation of the Air Traffic Service Unit (ATSU)

 (1TX1)
 ASM 46-21/05

 3. Fault Confirmation
__________________
 A. Test
 (1) Do the BITE test of the ATIMS (Ref. AMM TASK 46-21-00-740-001).
 4. Fault Isolation
_______________
 A. If the test gives the maintenance message DATA LOADER(1TD)/ATSU1(1TX1):
 - replace the MDDU (1TD) (Ref. AMM TASK 31-38-22-000-001) and (Ref. AMM TASK 31-38-22-400-001).
 (1) If the fault continues:
 - replace the ATSU (1TX1) (Ref. AMM TASK 46-21-34-000-001) and (Ref. AMM TASK 46-21-34-400-001).
 (a) If the fault continues:
 - remove the MDDU and the ATSU

 - do a check and repair the wiring of the DATA LOADER INPUT BUS : between pins A/24,25 of the MDDU and pins AA/8J,8K of the ATSU (Ref. ASM 46-21/05)

 - install the MDDU and the ATSU.

 B. Do the test given in Para. 3.
 「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 : 106-149, 151-199, 201-299, 301-399, ∞∞46-21-00∞∞∞∞∞∞∞∞∞∞Page 230
 401-499, Aug 01/05 CES Loss of the Frequency Control by the ATSU on the RMP3

 1. Possible Causes
_______________
 - RMP-COM FREQ SEL, 3 (1RG3)

 - wiring of the DFS PORT SELECT DISCRETE

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 23-13-13-000-001 Removal of the Radio Management Panel (CRMP) (1RG1, 1RG2, 1RG3) AMM 23-13-13-400-001 Installation of the Radio Management Panel (CRMP)
 (1RG1, 1RG2, 1RG3) AMM 46-21-00-710-001 Operational Test of the ATSU ASM 46-21/04
 3. Fault Confirmation
__________________
 A. Test
 (1) Do the fifth part of the operational test of the ATSU (Ref. AMM TASK 46-21-00-710-001).
 4. Fault Isolation
_______________
 A. If, during the operational test, the ATSU cannot control the VHF3
 frequency through the RMP3 only:

 - replace the RMP-COM FREQ SEL, 3 (1RG3) (Ref. AMM TASK 23-13-13-000-001) and (Ref. AMM TASK 23-13-13-400-001).
 (1) If the fault continues:
 - repair the wiring of the DFS PORT SELECT DISCRETE from the RMP3 (1RG3) pin A/F to the first terminal block (Ref. ASM 46-21/04).
 B. Do the test given in Para. 3.
 「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 : 106-149, 151-199, 201-299, 301-399, ∞∞46-21-00∞∞∞∞∞∞∞∞∞∞Page 231
 401-499, Aug 01/05 CES

 Loss of the Frequency Control by the ATSU
 1. Possible Causes
_______________
 - ATSU (1TX1)

 - XCVR-VHF, 3 (1RC3)

 - wiring of the DFS PORT SELECT DISCRETE

 - wiring of ATSU SYS5 OUTPUT BUS

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 23-12-33-000-001 Removal of the VHF Transceiver (1RC1, 1RC2, 1RC3) AMM 23-12-33-400-001 Installation of the VHF Transceiver (1RC1, 1RC2,
 1RC3) AMM 46-21-00-710-001 Operational Test of the ATSU AMM 46-21-34-000-001 Removal of the Air Traffic Service Unit (ATSU) (1TX1) AMM 46-21-34-400-001 Installation of the Air Traffic Service Unit (ATSU)
 (1TX1)
 ASM 46-21/04
 ASM 46-21/06

 3. Fault Confirmation
__________________
 A. Test
 (1) Do the fifth part of the operational test of the ATSU (Ref. AMM TASK 46-21-00-710-001).
 4. Fault Isolation
　
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