Garmin GNC 420 User Manual download pdf (Page 21)

GNC 420/420A Quick Reference

190-00140-21 Rev. F

FLYING THE MISSED APPROACH

21

• A ‘START PROC TRN’ prompt will appear in the

lower right corner of the display to advise the

pilot when the aircraft is at a safe distance to

initiate a procedure turn. The procedure turn is

displayed on the Map Page, but guidance through

the turn itself is not provided.

• Alerts for proper holding pattern entry (e.g.,

‘HOLD DIRECT’) are displayed in the lower right

corner of the display. Waypoint sequencing is

automatically suspended (indicated by ‘SUSP

directly above the OBS Key) at the holding

waypoint. Press the OBS Key again to return

to automatic waypoint sequencing. For course

reversals, waypoint sequencing is suspended

for one trip around the holding pattern only

(after which it will return to automatic waypoint

sequencing).

• The CDI will guide the pilot through a DME arc.

Just keep the needle centered to ﬂy along the arc.

When using an autopilot, the course select on the

CDI (or HSI) must be periodically updated with

the desired track (DTK).

• When crossing the missed approach point, ‘SUSP’

will appear above the OBS Key, indicating that

automatic sequencing of waypoint is suspended at

the missed approach point, and a ‘from’ indication

will appear on the CDI (or HSI).

Flying a Missed Approach:

1) Press the OBS Key. The next waypoint in

the approach (MAHP; in this case ‘SWARM’

intersection) is automatically offered as the

destination waypoint.

2) Follow the missed approach procedures, as

published on the approach plate, for proper

climb and heading instructions.

3) An alert message in the lower right-hand corner

of the screen recommends entry procedures for

the holding pattern (e.g., ‘HOLD TEARDROP’).

When flying the holding pattern, a timer

appears on the Default NAV Page. The timer

automatically resets on the outbound side of

the hold when the aircraft turns abeam the

hold waypoint. The timer again resets as the

pilot turns inbound (within approximately 30°

of the inbound course). This allows use of

standard timing (typically one minute) to ﬂy

the inbound and outbound legs of the hold.

4) The GNC 420 provides course guidance only

on the inbound side of the holding pattern.

When leaving the holding pattern to re-fly

the approach (or another approach) press the

PROC Key to ‘Select Approach?’ or ‘Activate

Approach?’ as previously described. (Or, use the

Direct-to Key to select another destination.)

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