Garmin 500W Series, Pilot'S Manual & Reference

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5 - PROCEDURES
114 190-00357-00 Rev G
LNAV Approach
5. Sixty seconds prior to reaching the FAF (LOTKE),
the unit will check the required Horizontal Alarm
Limit (HAL) and Vertical Alarm Limit (VAL) to
ensure the GPS position integrity is within limits
to complete the LPV precision approach. In
the event the HAL or VAL limits are exceeded,
the approach will be downgraded to a non-
precision approach indicated by “LNAV” on
the moving map, a message that the approach
is downgraded (“Approach downgraded - Use
LNAV minima”), and the glideslope indicator
will be flagged. You may continue the approach
using LNAV non-precision minimums if there
are LNAV minimums for this approach. In the
rare event the GPS integrity cannot meet the
non-precision HAL limits, the unit will send a
message to the pilot to abort the approach
(“Abort Approach - Loss of Navigation”). The
unit will revert to terminal limits to support
navigation to the missed approach when the
message is acknowledged.
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