TM 1–1520–238–T–3
Change 5
2–1
CHAPTER 2
AIR DATA SYSTEM (ADS) MULTIPLEX READ CODES
FAILURE SYMPTOM INDEX
Symptom
Refer to paragraph
ADS INDICATOR ON CAUTION/WARNING PANEL LIT . . . . . . . . . . . . . . . . . . .
2–1
AIR DATA PROCESSOR NO–GO AFT AVIONICS BAY . . . . . . . . . . . . . . . . . . . 2–1
OMNI DIR AIRSPEED SENSOR NO–GO MAIN ROTOR MAST . . . . . . . . . . . . 2–3
ERRATIC AIRSPEED INDICATION ON HOD . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–5
ERRATIC STABILATOR OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–10
ERRATIC SIDESLIP INDICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–11
Personnel Required:
(2)
References:
TM 9–1230–476–20–2
Equipment Conditions:
Ref
Condition
TM 9–1230–476–20–2
AIR DATA SUBSYSTEM –
MAINTENANCE
OPERATIONAL CHECK in
progress
NOTE
All multiplex read code responses are read from right to
left.
Multiplex read codes must be used in conjunction with
applicable Maintenance Operational Check (MOC) in
progress.
Multiplex read codes are observed on the HOD (ADC) or
CDU (ADD).
MULTIPLEX READ CODE INTERPRETATIONS
2–1 SIGNAL NAME:
ADS TEST STATUS
MEMORY LOCATION: 002106
MEMORY DATA BIT(S):
7
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Interprets air data system (ADS) status.
REMARKS: From omnidirectional airspeed sensor (OAS) through air data processor (ADP) and
digital automatic stabilization equipment computer (DASEC) multiplex remote terminal
unit (MRTU) to fire control computer (FCC).
PASS:
If fifth digit displayed on heads out display (HOD) is 0, 2, 4, or 6, go to paragraph 2–2.
FAIL: Location of fault: go to paragraph 2–3.
