TACAN Due to the increased cone of confusion associated with TACAN stations,
station passage is noted when DME stops decreasing. When flying directly over the TACAN
station, the range indicator will stop decreasing when it indicates the approximate aircraft altitude
above the station in nautical miles (NM). For example, an aircraft flying at 30,000 feet over a
TACAN station at sea level will indicate station passage at 5 DME (6000 feet per 1 NM).
Your instrument indications will fluctuate when close to the station;
this does not necessarily mean your aircraft is off course. Do not
chase either the VOR or TACAN needle when close to the station.
Limit your heading corrections to within 10º of drift corrected
heading when in close to avoid overshooting.
Reference: NIFM Part V, "Station Passage."
Amplification An overthestation intercept is a procedure used to intercept and fly
outbound on a specific radial after station passage. In Radio Instrument Stage, the overthe
station intercept will be practiced as a distinct maneuver. In the "real world" the overthestation
intercept is normally performed as part of an overall maneuver such as an instrument approach or
Missed Approach, or while flying the airways.
Procedure Upon station passage, perform the following procedures: (6 Ts as appropriate).
TIME Note time of station passage; write it down.
Turn in the shortest direction toward the outbound course.
Roll out on a heading the same as the outbound course (parallel the new
TIME As required.
TRANSITION As required.
TWIST Set the new course in the IND350.
Wait for the VOR or TACAN needle to settle down.
Note the number of degrees between the intended course and the tail of the
6-22 RADIO INSTRUMENT FLIGHT PROCEDURES