B747-200/300 NAV-INS

INS

1.3 INS IN MAIN EQUIP CNTR  AND THEIR BATT IS IN FLT EQUIP CNTR

2.ALSO A BATT WARN LOGIC IS IN E2

3.GREEN “READY NAV”  LIGHT  WHEN ALIGHNED

4.“BAT” LIT ON SEL PNL RED WHEN VOLTAGE DROP BELOW 19 AND BAT IN USE

5.“INS ON BAT “ CAUSE HORN ON THE GND

6.INS MODES:

            STBY : WARM UP

            ALIGN: PREPRATION

            NAV: NAV INFORMATION

            ATT: NO COMPUTED DATA (ONLY VG/DG )

7.A SW ON P4 CAN PARALLEL THE BAT 1 AND 3 FOR INS#1 SO INS #3 POWER CUT

8.INS CONN TO A/P IS HARD WIRE

9.30SEC BEFOR NEXT WAYPOINT IN MAN MODE  “ALERT “ LIT ON CDU FLASHES AND IS OFF IN AUTO MODE IN AUTO MODE FLASH 2MIN BEFOR THEN OFF IN LEG CHANGE

10.  “ WARN “ LIT FLASH WHEN PRESENT POS IS NOT MATCHED WITH GIVEN POS

11.  BAT CHARGER FOR INU IS INSIDE

12.  BAT VALIDITY IS NEEDED TO OPERATE INU

13.  INU DATA GOES TO HSI  VIA VOR/ILS/NAV SW

14.  INS HAS 3 ACCELEROMETER TO CALCULATE GND SPD AND WIND SPD

15.  ADC GIVES THE TAS TO INS TO CALCULATE THE WIND SPD