BASIC INSTRUMENT PROCEDURES
Figure 1-3 TACAN Orientation
Any time the aircraft is not tracking directly inbound or outbound to the station,
you will fly across radials. This is represented on the BDHI by upward
movement of the tail of the needle. "The tail always rises" (it still rises in
advanced training, just as it did in primary and intermediate training).
Radial crossing rate is at its maximum when the number two needle is
horizontal on the compass card. It is at a minimum when the number two
needle approaches the vertical on the compass card. Distance (DME) rate of
change is at its maximum when the number two needles is vertical on the
compass card, and at its minimum when the number two needle is horizontal on
the compass card.
The BDHI is the primary navigation instrument in the aircraft. A thorough
understanding of its operation and the techniques involved in utilizing the
information provided by the BDHI is essential for flight in instrument
conditions. Flight during instrument conditions requires the crew to use
instruments to determine the geographical location of the aircraft. The BDHI is
the key to visualizing the location of the aircraft in relation to the selected
navigational aid (Figure 1-4).
The BDHI display is powered by the Monitored AC bus (# 2 inverter).
Indications are received through a remote compass transmitter and directional
gyro, which are powered through the Primary AC bus (#1 inverter). For
additional information, refer to the T-2C NATOPS Flight Manual.
BASIC INSTRUMENT PROCEDURES 1-15