B747-200/300 NAV-ADF

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ADF

1.      ADF FREQUENCY : 190KHZ TO1749.5 KHZ

2.      ADF RX AND R/A IS IN CENTER EQUIPMENT BUT 747-SP IS IN CARGO

3.      LOOP ANT GIVES SIGNALS TO QUADRANT ERROR CORRECTION THEN ADF RX

4.      RMI CAN BE SELECTED FOR ADF OR VOR

5.      IF ANT MODE IS SELECTED LOOP ANT DISABLED SO POINTER SHOWS 9 O'CLOCK

6.      ADF TEST FROM CONT PNL OR RX : 1020HZ TONE HEARD, RMI SHOWS 315 DEGREE, POINTER ON RX SHOWS 45 DEG (LOOP ANT BLOCKED , SENSE ANT IS NULL

7.      ADF FAIL POINTER SHOWS 3 O’CLOCK