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CHAPTER 2 AIR DATA SYSTEM (ADS) MULTIPLEX READ CODES | Up
TM-1-1520-238-T-3 Army Model AH-64 Helicopter (NSN
1520-01-106-9519) (EIC: RHA) Multiplex Read Codes Manual | Next
ADS AIR DENSITY RATIO |
TM 1–1520–238–T–3
2–2
Change 5
2–2 SIGNAL NAME:
CPG ADS LIGHT
MEMORY LOCATION: 000565
MEMORY DATA BIT(S):
14
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Monitors ADS.
REMARKS: From FCC through copilot/gunner (CPG) MRTU Type III to CPG and pilot
caution/warning panels.
PASS:
If second digit on HOD is 4, 5, 6, or 7, go to paragraph 2–3.
FAIL: Location of fault: CPG MRTU Type III, wiring from CPG MRTU Type III to pilot caution/warning
panel, pilot caution/warning panel, wiring from CPG MRTU Type III to CPG caution/warning
panel, CPG caution/warning panel, wiring between pilot caution/warning panel and CPG
caution/warning panel. Troubleshoot wiring to isolate fault (TM 9–1230–476–20–2).
2–3 SIGNAL NAME:
OAS STATUS
MEMORY LOCATION: 002130
MEMORY DATA BIT(S):
9
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Monitors OAS status
REMARKS: NAV AIR DATA AC circuit breaker, wiring from NAV AIR DATA AC circuit breaker to
ADP, ADP, wiring from ADP to OAS, OAS, wiring from OAS to ADP, wiring from ADP to
DASEC, DASEC to FCC.
PASS:
If fourth digit displayed on HOD is 2, 3, 6, or 7, go to paragraph 2–4.
FAIL: Location of fault: NAV AIR DATA AC circuit breaker, wiring from NAV AIR DATA AC circuit
breaker to ADP, ADP, wiring from ADP to OAS, OAS, wiring from ADP to DASEC, DASEC.
Troubleshoot wiring to isolate fault (TM 9–1230–476–20–2).
2–4 SIGNAL NAME:
ADP STATUS
MEMORY LOCATION: 002130
MEMORY DATA BIT(S):
11
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Monitors ADP status.
REMARKS: NAV AIR DATA DC circuit breaker, wiring from NAV AIR DATA DC circuit breaker to
ADP, ADP, wiring from ADP to OAS, OAS, wiring from OAS to ADP, wiring from ADP to
DASEC, DASEC to FCC.
PASS:
If third digit displayed on HOD is 4, 5, 6, or 7, go to paragraph 2–5.
FAIL: Location of fault: NAV AIR DATA DC circuit breaker, wiring from NAV AIR DATA DC circuit
breaker to ADP, ADP, wiring from ADP to OAS, OAS, wiring from ADP to DASEC, DASEC.
Troubleshoot wiring to isolate fault (TM 9–1230–476–20–2).
2–5 SIGNAL NAME:
ADS TOTAL VEL
MEMORY LOCATION: 002135
MEMORY DATA BIT(S):
4–19 (ACY) 4–15 (ACZ)
(SCALAR)
CONDITION:
Monitor HOD; zero velocity should be indicated on the ground.
SIGNAL FUNCTION:
Sends ADS total velocity data to FCC.
REMARKS: From ADS through DASEC to FCC.
PASS:
If CONDITION corresponds to proper velocity indication, go to paragraph 2–6.
FAIL: Location of fault: ADP, wiring from ADP to DASEC, DASEC. Troubleshoot wiring to isolate fault
(TM 9–1230–476–20–2).
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