Other Position Instruments

CHAPTER TWO

T-6A INSTRUMENT NAVIGATION

2. Full scale deflection on the course indication scale represents approximately 2 1/2 of LOC

course deviation.

3. The course indicator will display whether the aircraft is right or left of course regardless of

the course selected with the course set knob.

The CDI displays only whether the aircraft is on course or right or left of course based upon

signal information from a specific selected LOC transmitter. Therefore, always set the published

inbound front course of the ILS/LOC in the course selector window. This enables you to

interpret aircraft position through use of the course indicator in the same manner described for

VOR course and position determination.

The Glideslope Indicator (GSI) displays glideslope position in relation to the actual position of

the aircraft. For example, if the GSI bar is above the center of the gauge, the glideslope is above

the aircraft. Each of the four dots in the vertical row represents approximately 1/4 of deviation

from the glideslope.

NOTE

ILS course and glideslope displays are reliable only if their

warning red X fail annunciations are not in view and the aural ILS

identification is being received.

The marker beacon light(s) on the course indicator indicate proximity to a 75 MHz marker

beacon (e.g., ILS OM or MM.) As the aircraft flies through the marker beacon signal pattern, the

light flashes in Morse Code indicating the type of beacon being over flown. The marker beacon

light is not used in conjunction with VOR or GPS approaches.

204. OTHER POSITION INSTRUMENTS

Modern naval aircraft are tending toward more sophisticated instruments for determining aircraft

position. Some of these systems include radar, inertial and GPS navigation, and computerized

visual displays. These systems are explained in appropriate NATOPS flight manuals.

2-6 INTRODUCTION TO AIRCRAFT FLIGHT INSTRUMENT