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CHAPTER FOUR
INSTRUMENT NAVIGATION
400. INTRODUCTION
You will be navigating from the rear cockpit. Check the clock for proper operation in addition to
performing those portions of the NATOPS Preflight your instructor assigns.
After the aircraft has been started, complete the Before-Taxi Checklist and begin to taxi.
Clearing the parking area (no sooner than abeam Delta row but prior to Taxiway Foxtrot), call
ground control for taxi clearance and call for the taxi check. Set your altimeter according to the
information included in your taxi instructions if it differs from the ATIS information. After the
taxi check is complete, start the Instrument Checklist.
NOTE
When able, perform an actual "in use" test of your NAVAIDs prior to
flight.
401. RADIO AND EQUIPMENT CHECKOUT
VOR Test Facility
VOR azimuth can be tested on selected civil and joint use airfields or certified checkpoints on
the airport surface (military and civil airfields). The VOR transmits a test signal identified by a
continuous series of dots or a continuous 1020-hertz tone. With the proper VOR Test (VOT)
Facility frequency tuned, the VOR bearing pointer points to180. Selecting a course of 180
should center the CDI with a "TO" indication. VOT frequencies are listed in the IFR Enroute
Supplement opposite "Radio Aids to Navigation" for selected airports.
Certified airborne checkpoints have been established on airways and in the vicinity of VOR
stations to check the accuracy of VOR azimuth in flight. VOR airborne checkpoints are
published in the FLIP AP1 under country listing. For instance, "CRESTVIEW, FL (Bob Sikes)
106, 8.6 NM; over rotating beacon; 1200 feet."
Example: When flying directly over the rotating beacon at Bob Sikes airport with Crestview
VORTAC tuned, the VOR bearing pointer and HSI should indicate a course of 106 with 8.6 in
the DME.
Ground Checkpoints. Military bases normally provide specific ground points to check TACAN
accuracy within + 4 of the designated radial.
NOTES
1.
With error in excess of + 4 during a ground check or + 6 during an
airborne check, IFR flight should not be attempted.
INSTRUMENT NAVIGATION
4-1


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