Procedures - P-8710064

CHAPTER FOUR

T-6A INSTRUMENT NAVIGATION

Monitor the station identifier to ensure continuous signal integrity.

5. Confirm the correct source for the bearing pointer and CDI. Navigation information is

reliable only when:

The warning indicator (red X) is not displayed.

The NAVAID identifier is received.

The aircraft is in within the usable range of the equipment.

Twist the proper course into the CDI.

7. Update Navigation. Ensure the present heading falls between the head of the bearing

pointer and the desired radial. Then use the "pencil-method" to further refine the aircraft track

toward the fix.

Establish the fix with the greater distance (20 NM) at the edge of the compass card on

its radial (180).

Establish the remaining fix (090 radial/10 NM) along its radial at a proportionate

distance from the center of the card (halfway).

Draw an imaginary line with the aid of a pencil or finger (no other straight edge aid is

authorized in the cockpit) from the aircraft's present position through the next fix

(Figure 4-9). Move the "line" to the center of the card. Now read the no-wind

heading to the desired fix (approximately 030 in this case). Be aware, the taper of

the pencil point and thickness of the pencil will induce a slight heading error.

NOTE

The time required to proceed to the new fix can be derived by

estimating the length of the "line" between the two fixes and using

the scale already determined as the distance to the outer edge of the

compass card (in this case about 25 miles). Divide the distance by

the GS in miles per minute to determine the time enroute and the

ETA to the new fix.

4-26 INSTRUMENT NAVIGATION