TM 1–1520–238–T–3
Change 7
6–1
CHAPTER 6
HEADING ATTITUDE REFERENCE SYSTEM (HARS)
MULTIPLEX READ CODES
FAILURE SYMPTOM INDEX
Symptom
Refer to paragraph
HARS WILL NOT ALIGN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6–1
HSI HDG WARNING FLAG IS VISIBLE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6–1.1
HSI HDG, RAI AND RMI OFF FLAG ARE IN VIEW OR HARS GO
INDICATION IS NOT DISPLAYED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6–1
HARSHDG? MESSAGE IS DISPLAYED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6–2
HARS ELECTRONIC UNIT NO–GO AFT AVIONICS BAY . . . . . . . . . . . . . . . . . 6–9
HSI COMPASS CARD DOES NOT INDICATE CHANGES IN HEADING
MOVEMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6–15
RMI COMPASS CARD DOES NOT INDICATE CHANGES IN HEADING
MOVEMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6–15
HDG OR A.C. REF FAIL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6–15
RAI DOES NOT INDICATE PITCH UP AND PITCH DOWN . . . . . . . . . . . . . . . . 6–16
RAI DOES NOT INDICATE LEFT AND RIGHT ROLLS . . . . . . . . . . . . . . . . . . . . 6–18
NO MOVEMENT IN YAW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6–20
CANNOT PROGRAM PRESENT POSITION IN HARS . . . . . . . . . . . . . . . . . . . . 6–31
INACCURATE HEADING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6–29
INACCURATE READINGS IN LATITUDE AND LONGITUDE . . . . . . . . . . . . . . . 6–32
INACCURATE INDICATION IN PITCH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6–36
INACCURATE INDICATION IN ROLL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6–39
INACCURATE VELOCITY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6–43
Personnel Required:
(2)
References:
TM 1–1520–238–T–6
TM 9–1230–476–20–2
TM 11–1520–238–23–2
Equipment Conditions:
Ref
Condition
TM 11–1520–238–23–2
HARS –MAINTENANCE
OPERATIONAL CHECK in
progress
TM 9–1230–476–20–2
MULTIPLEX SUBSYSTEM
– POWER UP completed
TM 11–1520–238–23–2
DOPPLER – POWER UP
completed
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).
