TM 1–1520–238–T–3
Change 4
2–3
2–6 SIGNAL NAME:
ADS AIR DENSITY RATIO
MEMORY LOCATION: 002136
MEMORY DATA BIT(S):
4–19 (ACY) 4–15 (ACZ)
(SCALAR)
CONDITION:
Monitor HOD; a positive reading should be indicated.
SIGNAL FUNCTION:
Sends ADS air density ratio data to FCC.
REMARKS: From ADP through DASEC to FCC.
PASS:
If CONDITION corresponds to proper air density indication, go to paragraph 2–7.
FAIL: Location of fault: ADP, wiring from ADP to DASEC, DASEC. Troubleshoot wiring to isolate fault
(TM 9–1230–476–20–2).
2–7 SIGNAL NAME:
ADS LAT VEL
MEMORY LOCATION: 002141
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 lateral velocity data to FCC.
REMARKS: From ADP through DASEC to FCC.
PASS:
If CONDITION corresponds to proper velocity indication, go to paragraph 2–8.
FAIL: Location of fault: ADP, wiring from ADP to DASEC, DASEC. Troubleshoot wiring to isolate fault
(TM 9–1230–476–20–2).
2–8 SIGNAL NAME:
ADS AMBIENT TEMP
MEMORY LOCATION: 002144
MEMORY DATA BIT(S):
4–19 (ACY) 4–15 (ACZ)
(SCALAR)
CONDITION:
Monitor HOD; if outside air temperature is above zero degrees centigrade a positive
number will appear on HOD, if outside air temperature is below zero degrees
centigrade a negative number will appear on HOD.
SIGNAL FUNCTION:
Sends outside ambient temperature data to FCC.
REMARKS: From OAS through ADP and DASEC to FCC.
PASS:
If CONDITION corresponds to proper temperature indication, go to paragraph 2–9.
FAIL: Location of fault: OAS, wiring from OAS to ADP, ADP, wiring from ADP to DASEC, DASEC.
Troubleshoot wiring to isolate fault (TM 9–1230–476–20–2).
2–9 SIGNAL NAME:
ADS AMBIENT PRESSURE (ACY) STATIC PRESSURE (ACZ)
MEMORY LOCATION: 002145
MEMORY DATA BIT(S):
4–19 (ACY) 4–15 (ACZ)
(SCALAR)
CONDITION:
Monitor HOD; a positive reading will result if the barometric altimeter indicates above
field level, a negative reading will result if the barometric altimeter indicates below field
level.
SIGNAL FUNCTION:
Sends outside air pressure data to FCC.
REMARKS: From OAS through ADP and DASEC to FCC.
PASS:
If CONDITION corresponds to proper air pressure indication, go to paragraph 2–10.
FAIL: Location of fault: OAS, wiring from OAS to ADP, ADP, wiring from ADP to DASEC, DASEC.
Troubleshoot wiring to isolate fault (TM 9–1230–476–20–2).
