II Morrow Inc. NMC 2001 Operating Manual page 58

Message Displays Operations
pressing the OBS/HOLD button and exercise the missed approach
procedure.
Parallel Track - Approach Conflict
Before an "Enable Approach" alert can occur, parallel track must be
"Off." the following message provides the warning and a fast means to
stop parallel track by pressing ENT, as indicated. This does not
become an old message after viewing.
Enable Approach
If an approach is loaded in the active plan but not enabled, then at 30
nm to the destination airport and again at 3 nm to the FAF waypoint,
the Enable Approach alert will occur. Parallel Track will be disabled
when approach operation is enabled. Pressing ENT will: enable
approach (approach transition operation), turn the APPRCH indicator
solid, lock on the GPS sensor, and display a barometric alert.
If Loran position inputs are available, the bottom line of the message
will also display "and Lock on GPS," indicating that automatic sensor
selection will be disabled when approach in enabled.
Approach Enabled Too Late
When the approach is enabled less than 2 nm inbound to the FAF or
after crossing the FAF (inbound to MAP), the Approach Enabled Late
alert will occur. This does not become an old message after viewing.
You must abort the approach by pressing the OBS/HOLD button and
exercise the missed approach procedure.
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