Figure 1-3 TACAN Orientation

BASIC INSTRUMENT PROCEDURES

CHAPTER ONE

Figure 1-3 TACAN Orientation

iv.

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.

Bearing-Distance-Heading-Indicator (BDHI)

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).

ii.

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