GPS Arcing Approach -Cont.

T-34C INSTRUMENTS

CHAPTER SEVEN

The double RMI needle now provides information from the KLN

900, but the NACWS display continues to indicate DME from the

selected TACAN or VOR/DME.

Brief the approach. If required determine step-down altitudes using the profile view

on the approach plate.

WARNING

The GPS always displays distance to the active waypoint, which

is different than the DME distance from the NAVAID on the

instrument approach procedure. Pilots must exercise extreme

caution to preclude either a dangerously early or late descent on

final. DO NOT confuse GPS distance with DME.

Verify APR ARM is annunciated within 30 NM of the airfield.

Select the SUPER NAV 5 display set the scale to AUTO.

NOTE

The CDI scale factor will smoothly change for + 5.0NM to + 1.0 NM

full deflection at this time. The CDI scale is in nautical miles not

degrees.

Press ALT to verify the altimeter setting in the KLN 900.

Select LEG mode prior to IAF.

At IAF perform 6 Ts.

Once established on the arc:

Twist in the Desired Track from the GPS into the CDI.

ii.

The Active WPT will now be the point at the end of the arc. This is where the

GPS needle will be pointing.

iii.

Configure to BAC 5 NM prior to FAWP.

NOTE

If the aircraft is on the arc the CDI will be centered. The GPS

INSTRUMENT NAVIGATION 7-45