Figure 1-5 Course Indicator

BASIC INSTRUMENT PROCEDURES

CHAPTER ONE

the heading pointer points toward the CDI will turn the aircraft toward the

selected course.

iv.

The four dots on the course deviation scale are used in conjunction with the

course deviation indicator bar to signify 5 and 10 radials right or left of the

selected course.

An OFF flag will appear at the top of the instrument when the course

information signal is too weak or unreliable to provide accurate course or course

deviation information.

vi.

The TACAN needle and the CDI are each provided navigation data

independently. If there is a difference between the two indications, it can only

be concluded that at least one indication must be incorrect. Both could be

incorrect. Either one (or both) may have failed. A third source of aircraft

location information would be needed to determine which indication is incorrect

(or if both are incorrect), such as a wingman's TACAN indications, a RADAR

position, or a bearing indication on the BDHI #1 (ADF) needle. If only the

TACAN needle is inoperative, the CDI may still be used for navigation.

vii. If it is decided that the TACAN needle is correct and the CDI is still

functioning, but is merely displaying indications that do not agree exactly with

indications of the TACAN needle, the CDI may still be used by rotating the

course set knob until the Course Deviation Indicator matches the indications of

the TACAN needle on the BDHI. The CDI will then accurately indicate

deviations from the radial.

NOTE

As stated in NATOPS, the Glideslope bar is not enabled in the

T-2C. It is therefore a normal indication to see an orange "off"

flag on the CDI at the nine o'clock position.

Figure 1-5 Course Indicator

BASIC INSTRUMENT PROCEDURES 1-17