CHAPTER 4 REFERENCE GUIDE
EFD1000 PRO MAX PFD Pilot’s Guide
Page 4-67
091-00005-002 ()
8. Monitor the PFD CDI and verify that the autopilot intercepts and tracks the
final 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 final 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.
GPS APPR Mode Operation – WAAS GPS Underlay to ILS Approach Using Pilot
Navigation and GPSS
1. With a valid ILS approach loaded and activated in the GPS, use the CDI Source
Select button to couple the GPS to the PFD CDI
2. Verify that the correct ILS frequency is tuned.
3. When the active flight plan leg is the course to the Initial Approach Fix (IAF),
enable.
4. Engage the autopilot in Heading (HDG) and Altitude (ALT) Hold modes and
verify that the aircraft continues to fly the course to the IAF.
5. Monitor the PFD CDI and aircraft track to ensure the aircraft flies to the IAF
and then turns outbound for the course reversal.
6. A WAAS GPS navigator provides guidance along curved flight paths, and will
guide the aircraft through the course reversal and establish it inbound to the
FAF without pilot intervention.
7. Once established on the final approach course to the FAF, engage the
autopilot’s Approach (APPR) mode.
8. Use the PFD CDI Source Select button to change to the VLOC for the
approach (if not done automatically by the GPS/nav receiver).
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 fly 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 flown the
same way, much like an ILS approach. The pilot must
be aware of the differences and which minima to use.
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