• For GPS-based approaches, receiver autonomous integrity monitoring (RAIM)
will monitor satellite conditions and alert you—using an "INTEG" or "WARN"
annunciation at the bottom left corner of the display (see page 10)—if
protection limits cannot be maintained. If this occurs, the GPS receiver should
not be used for primary navigation guidance. Revert to an alternate navigation
source, such as an external VOR/ILS receiver, or select an alternate destination
airport.
• Within 30 nautical miles of the destination airport, CDI scaling will transition
from 5.0 nautical miles (enroute mode; or "ENR") to 1.0 nautical mile (terminal
mode; or "TERM")—or when leaving the departure airport, from 1.0 nm to
5.0 nm. Within 2.0 nautical miles of the final approach fix, GPS-based
approaches will see a second transition from 1.0 nautical mile to 0.3 nautical
mile (approach mode; or "APR").
• A "START PROC TURN" prompt will appear in the lower right corner of the
display to remind you to initiate a procedure turn (if you haven't already begun
the procedure turn). The procedure turn is displayed on the Default NAV and
Map pages, 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 you through a DME arc. Just keep the needle centered as
you 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).
Approaches
• As you cross the missed approach point
(MAP), "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 the Missed Approach
1. After crossing the missed approach point, press the OBS key. The next
waypoint in the approach is automatically offered as the destination
waypoint.
2. Follow the missed approach procedures, as published on your approach
plate, for proper climb and heading instructions.
3. An alert message in the lower right hand
corner of the screen will recommend entry
procedures for a holding pattern (i.e.,
"HOLD DIRECT", "HOLD PARALLEL", or
"HOLD TEARDROP"). As you fly the
holding pattern, a timer appears on the
Default NAV page. The timer automatically
resets on the outbound side of the hold when you are abeam the hold
waypoint. The timer again resets as you turn inbound (within approximately
30° of the inbound course). This allows you to use standard timing
(typically one minute) to fly the inbound and outbound legs of the hold.
4. The GPS 500 will provide 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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