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b.   Verify   proper   response   of   CDU   panel lighting
15.  HF Radio (AN/ARC-220)/COMSEC (KY-100)

TM-1-1520-240-MTF Army Model CH-47D Heilcopter (EIC:RCD) Manual
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TM 1-1520-240-MTF 4-63 k.   Fly shortest distance to first destination from present  position,  set  DISPLAY  switch  to DIST/BRG/TIME position and steer helicopter to bearing displayed. As an aid to maintaining course, set DISPLAY switch to XTK/TKE  position  and  steer  helicopter  to keep track angle error (TKE) nominally zero. If display indicates a L (left) TKE, the aircraft must be flown to the left to zero the error. l.   At  first  destination  set  DISPLAY  switch  to PP   and   KYBD   key   is   depressed   and released   note   the   position   altitude   and magnetic variation. m.   Fly to the remaining destination using the procedures described in (K) and (L) above. n.   Return to ground station. 14.  DGNS Flight Test Data Analysis. Compare all MARK positions with the actual positions of the corresponding Check Point. Compare differences, if any, with Allowable Navigation Error Limits outlines in TM 11-5841-305-12. If errors exceed the Allowable Navigation Error Limits, use the self-test of the GPS system and fault isolation procedures to determine the failure mode. NOTE Zeroize at termination of test flight or so dic- tated by operations. NOTE Aircraft power must be connected, or power applied to aircraft. a.   Lift zeroize switch guard and toggle switch. b.   Release  toggle  switch  and  close  switch guard.







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