Aspen Avionics Evolution EFD 1000 C3 Pro PFD - GPS;RNAV APV WAAS Approach

CHAPTER 4 REFERENCE GUIDE
Page 4-62
091-00019-001 REV B
EFD1000 C3 Pro PFD Pilot’s Guide
NOTE
WAAS GPS navigators can provide vertical guidance
on several types of GPS/RNAV instrument approaches.
RNAV (GPS) APV (Approaches with Vertical Guidance),
such as LPV and LNAV/VNAV approaches, often have
lower approach minima shown on the approach
plate. Aircraft equipped with appropriate WAAS GPS
equipment may use these lower minima.
Even with more traditional lateral guidance- only
GPS/RNAV approaches (e.g. (LNAV) with step-down
altitudes) WAAS GPS may still provide a pseudo-glide
slope that enables a continuous descent to the MDA
(Minimum Descent Altitude). The autopilot may
consider this a glide slope and attempt to y it. For this
type of instrument approach, the vertical guidance
is advisory only and the MDA is the appropriate
approach minimum.
These types of approaches are set up and own the
same way, much like an ILS approach. The pilot must
be aware of the dierences and which minima to use.
APPR Mode Operation – GPS or GPS/RNAV APV WAAS Approach
1. With a valid GPS approach programmed in the GPS, use the CDI Source Select
Button to couple the GPS to the PFD (see Section 4.4.5.).
2. If AUTOCRS is disabled, set the Course Pointer to the desired course (see Section
4.4.7.), or enable AUTOCRS (see Section 4.4.7.).
3. With GPSS disabled, set the PFD Heading Bug to a value that will intercept the
active leg of the ight plan (see Section 4.4.9.) or enable GPSS via GPSS Hot Key.
4. Engage the autopilot in Heading (HDG) mode and verify that the aircraft turns to a
heading to intercept the active leg of the approach.
5. For autopilots that do not support automatic heading mode to Navigation (NAV)
or Approach (APPR) mode transitions, use the Heading Bug to establish the aircraft
inbound to the Final Approach Fix (FAF) and then engage the autopilot’s Approach
(APPR) mode.
6. For autopilots that support automatic Heading (HDG) to Approach (APPR) mode
transitions, monitor the PFD CDI and verify that, upon intercepting the active leg of
the approach, the autopilot turns to track the GPS approachcourse guidance.
THE FOLLOWING APPLY FOR WAAS GPS/RNAV APV APPROACHES ONLY
7. Once cleared for the GPS/RNAV approach, select the autopilot’s Approach (APPR) mode.
8. Monitor the PFD CDI and verify that the autopilot intercepts and tracks the nal
approach course and the GPS switches to its Approach mode.
9. Most WAAS GPS navigators will not arm or activate vertical guidance until the
aircraft is within two miles of the FAF (unlike an ILS where the VDI will display as
soon as the aircraft is established on the nal approach course and a valid localizer
signal with glide slope signal is received). As you approach the FAF, watch for the
VDI to appear on the PFD Attitude Display. This indicates that the autopilot is
ready to capture the glide slope.
10. Monitor the autopilot lateral approach course tracking with the PFD CDI and LDI.
Upon intercepting the WAAS GPS glide slope, verify that the autopilot switches
captures the glide slope and starts a descent.