Garmin GNC 420W Pilots Guide - Page 103

DO NOT USE FOR NAVIGATION     SECTION 6 PROCEDURES Figure 6-53 Heading of 025° 4) ATC instructs the pilot to turn right to a heading of 115° (Figure 6-54). Figure 6-52 Terminal Mode In this example, we'll assume ATC vectors result in a rectangular course to intercept final, as follows (refer to Figure 6-52 for the following steps): 1) Within 30 nm of KTOP, the GNC 420 switches from enroute mode to terminal mode and the CDI scale transitions from 5.0 to 1.0 nm, full scale deflection. 2) If the approach has not already been activated, activate the approach (with vectors-to-final). This allows the GNC 420 to provide guidance to the final approach course. 3) ATC instructs the pilot to turn left to a heading of 025°. This places the aircraft parallel to the final approach course in the opposite direction (Figure 6-53). CDI needle deflection is to the left. Figure 6-54 Heading of 115° 5) ATC instructs the pilot to turn right to a heading of 175° to intercept the final approach course. When converging with the final approach course the needle moves toward the center. (In Figure 6-55, the needle has not yet returned to the on-screen CDI, since the current position is still 1.7 nm right of the final approach course.) Figure 6-55 CDI Off Scale 190-00140-20 Rev. K GNC 420(A) Pilot's Guide and Reference 6-19