Garmin GPS 175 Pilot's Manual page 134

Navigation
APPROACH
PERFORMING A
LPV APPROACH
3-60
DESCRIPTION AND INSTRUCTIONS
1. Within 31 nm of the destination, the GPS/GNX switches
from En Route mode to Terminal mode and the CDI scale
transitions from 2 to 1 nm, full-scale deflection.
2. Approaching the IAF, a waypoint message appears on the
bottom of the screen.
3. As the IAF distance approaches zero, an Time to Turn
advisory message appears and counts down 10 seconds
prior to the turn.
4. Approaching the FAF, the GPS/GNX rescales the angle. At
2.0 nm from the FAF, CDI scaling tightens from 1 nm to
the approach-defined angular full-scale deflection.
5. Sixty seconds prior to reaching the FAF, the GPS/GNX
checks the required Horizontal Alarm Limit (HAL) and
Vertical Alarm Limit (VAL) ensuring the GPS position
integrity is within approach limits.
If the HAL or VAL exceed the limits, the approach
•
downgrades to a non-precision approach
indicated by LNAV on the moving map. A
downgraded message appears and the
glideslope indicator flags, until the message is
viewed. Continue the approach using LNAV
non-precision minimums (if applicable).
If GPS integrity does not meet the non-precision
•
HAL limits, the GPS/GNX messages to abort the
approach. After acknowledging the message,
the unit reverts to terminal limits of 1 nm to
support navigation to the missed approach.
After the aircraft has passed the FAF, a loss of
WAAS integrity causes the approach to abort
instead of downgrade.
6. Capture the glideslope (the same as for an ILS glideslope).
7. When crossing the FAF, the waypoint sequences to the
MAP (e.g., RW31, the runway threshold). With the
needle on the external CDI (or HSI) centered, fly toward
the MAP, observing the altitude minimums published on
the approach plate.
8. In the Map Page, the final course segment shows in
magenta as the active leg of the flight plan.
9. Approaching the MAP, an Arriving at Waypoint message
appears on the bottom of the screen.
10.As the GPS/GNX crosses the MAP and sequencing
suspends, prepare the aircraft for a missed approach
operation. Tap Unsuspend to sequence to the missed
approach procedure.
11.Using the GPS/GNX guidance, fly to the MAHP and hold.
GPS 175/GNX 375 Pilot's Guide 190-02207-02 Rev. 1