- install the HFDR1 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 246
 401-499, Aug 01/05 CES

 Loss of the HFDR2 Data Detected by the ATSU
 1. Possible Causes
_______________
 - XCVR-HF, 2 (3RE2)

 - ATSU (1TX1)

 - wiring of the HF2 OUTPUT BUS

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------
REFERENCE DESIGNATION
 -------------------------------------------------------------------------------
AMM 23-11-33-000-001 Removal of the HF Transceiver (3RE1, 3RE2)
 AMM 23-11-33-400-001 Installation of the HF Transceiver (3RE1, 3RE2)
 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. Table of the circuit breakers used in this procedure:
 -------------------------------------------------------------------------------
PANEL DESIGNATION IDENT. LOCATION
 -------------------------------------------------------------------------------
121VU ATSU 1 3TX1 L16
 121VU ATSU 1/SWTG 5TX1 L15
 **ON A/C 151-199, 201-210, 301-399,
 121VU COM NAV/HF2 1RE2 L13
R **ON A/C 106-149, 151-199, 201-299, 301-399, 401-499,
 B. Test
 (1) Do the BITE test of the ATIMS (Ref. AMM TASK 46-21-00-740-001).
 「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 : 106-149, 151-199, 201-299, 301-399, ∞∞46-21-00∞∞∞∞∞∞∞∞∞∞Page 247
 401-499, Aug 01/05 CES

 4. Fault Isolation
_______________

 A. If the test gives the maintenance message HFDR2(3RE2)/ATSU1(1TX1):
 (1) Make sure that the circuit breakers 1RE2, 3TX1 and 5TX1 are closed.

 (a) If the fault continues: - open and close the circuit breaker 1RE2 to reset the HFDR2.

 (2) If the fault continues:

 1_ If the fault continues:
 - open and close the circuit breakers 3TX1 and 5TX1 to reset
 the ATSU.

 - replace the XCVR-HF, 2 (3RE2) (Ref. AMM TASK 23-11-33-000-001) and (Ref. AMM TASK 23-11-33-400-001).
 (a) 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).
 1 If the fault continues:
_
 - remove the HFDR2 and the ATSU

 - do a check and repair the wiring of the HF2 OUTPUT BUS : between pins AA/9C,9D of the HFDR2 and pins AA/4E,4F of the ATSU (Ref. ASM 46-21/05)

 - install the HFDR2 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 248
 401-499, Aug 01/05 CES

 ATSU Software Failure
 1. Possible Causes

_______________

 2. Job Set-up Information

______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 46-21-00-740-001 BITE Test of the ATIMS
 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 ATSU1(1TX1):
 (1) Open and close the circuit breakers 3TX1 and 5TX1 to reset the ATSU (wait one minute approximately).
 5. Close-up
________
 A. 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 249
 401-499, Aug 01/05 CES

 Loss of GPS Data Detected by the ATSU
 1. Possible Causes
　
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