GNC 420(A) Pilot’s Guide and Reference
SECTION 6
PROCEDURES
6-6
Flying the Procedure Turn
Figure 6-13 Sample Approach with Procedure Turn
DO NOT USE FOR
NAVIGATION
Refer to Figure 6-13 for the following steps:
1) Within 30 nm of the destination airport, the GNC
420 switches from ‘enroute’ mode to ‘terminal’
mode (as indicated in the lower left corner of
the screen). The switch to terminal mode is
accompanied by a gradual Course Deviation
Indicator (CDI) scale transition from 5.0 to 1.0
nm, full scale deflection (Figure 6-14).
Figure 6-14 CDI Scale at 1.0 nm
2) Several miles prior to reaching the IAF (LYH),
the pilot may wish to review the approach
sequence. Press the
FPL
Key to display the
Active Flight Plan Page. Press the small
right
knob, and then turn the large
right
knob to
review each segment of the approach (Figure
6-15). When finished, press the
FPL
Key again
to return to the previous page.
Figure 6-15 Active Flight Plan Page
3) When approaching the IAF (LYH), a waypoint
alert (‘NEXT DTK 205°’) appears in the lower
right corner of the screen (Figure 6-16). As
the distance (DIS) to the IAF approaches zero,
the alert is replaced by a turn advisory (‘TURN
TO 205°’). Dial the outbound course of 205°
into the CDI (or HSI) using the OBS knob.
190-00140-20 Rev. K
Summary of Contents for GNC 420
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