Garmin GNC 420 - Manual (Page 14)

GNC 420(A) Pilot’s Guide and Reference 1-6
SECTION 1
INTRODUCTION
190-00140-20 Rev. K
The Database Versions Page (Figure 1-5) appears
next, which shows the current database information
on the NavData Card and Terrain Data cards. Database
information highlighted in yellow indicates the database
is not within its effective dates. The NavData database is
updated every 28 days and must be current for approved
instrument approach operations. Information on database
subscriptions is available inside the GNC 420 package.
Figure 1-5 Database Versions Page
Acknowledging the database information:
Press the ENT Key.
Instrument Panel Self-test Page
Once the database has been acknowledged, the
Instrument Panel Self-test Page appears (Figure 1-6).
Figure 1-6 Instrument Panel Self-Test Page
To ensure that the GNC 420 and any connected
instruments are working properly, check for the following
indications on the CDI/HSI , RMI, external annunciators,
and other connected instruments:
• Course deviation - half left/no flag
• TO/FROM flag - TO
• Bearing to destination - 135°
• Distance to destination - 10.0 nautical mi.
• All external annunciators (if installed) - on
• Glideslope - half up/no flag
• Time to destination - 4 minutes
• Desired track - 149.5°
• Ground speed - 150 knots
The Instrument Panel Self-test Page (Figure 1-6)
indicates the currently selected OBS course, fuel capacity
(CAP), fuel on board (FOB), and fuel flow (FF). The fuel
capacity, fuel on board, and fuel flow may be manually
entered if the installation does not include connection to
sensors which automatically provide these figures.
Entering fuel capacity, fuel on board,
or fuel flow figures (if not provided by
sensors):
1) Turn the large right knob to select the ‘CAP’,
‘FOB’, or ‘FF’ field.
2) Turn the small and large right knobs to enter
the desired figure (Figures 1-6 and 1-7), then
press the ENT Key.