CHAPTER 6 HEADING ATTITUDE REFERENCE SYSTEM (HARS) MULTIPLEX READ CODES

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).