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3.  HSI and Magnetic Compass
8.  Transponder  AN/APX-100  and  Radar  Signal Detecting Set AN/APR-39

TM-1-1520-240-MTF Army Model CH-47D Heilcopter (EIC:RCD) Manual
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TM 1-1520-240-MTF 4-53 5.  ILS (if available). a.   At  a  distance  of  at  least  9  nautical  miles, tune to the localizer frequency. Start on ILS approach. b.   Check that NAV and GS warning flags are concealed. c.   Steer right and left. Check that the localizer pointer moves left and right, respectively. d.   Climb  and  descend.  Check  that  the  glide slope    pointer    moves    up    and    down, respectively. e.   Check   marker   beacon   lights   and   audio during   approach.   Check   high   and   low sensitivity. f.   With pointers centered, continue approach to runway to ascertain that proper landing can be made. 6.  ADF. a.   Tuning, reception and volume. b.   Check ADF, ANT and LOOP operation. c.   ADF   on   HSI   MODE   SELECT   panel   — Engaged and lit. d.   No. 2 pointer on HSI within $3_ of magnetic bearing to station. e.   No. 2 pointer fluctuation $5_. f.   Station passage. 7.  Marker beacon. a.   Push to test any MKR BCN light. (One light tests all three). b.   Check audio high and low sensitivity over appropriate markers.







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