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Operations
Approach Operations
GPS Approach Operations
The information in this section covers GPS Approach Procedures for
use with the Navigation Management System. The first part provides
an overview of approach operations. The second part is a check list that
gives an overview of the process for setting up and performing an
approach to a suitable airport. The third part gives more detailed
directions that cover many of the situations you will encounter
including example approaches. A fourth gives a background about
what RAIM is and what it means to your approach navigation.
Operations
There are three general areas of operation (see the diagram on the next
page): En Route, Approach Transition, and Approach Active.
En route operations describe what you do to set up your approach
information before you are within 30 nm of destination airport and
prior to enabling your approach. Load your approach to the active
flight plan. At 30 nm your NMC will ask if you want to enable
approach, press the ENT button. Then, enter the local altimeter setting.
If you are less than 30 nm from your destination when you load an
approach, you will be prompted immediately to enable it.
Approach Transition operations occur after you enable approach
operation. The APPRCH annunciator will turn on. The CDI sensitivity
will gradually scale from 5.0 to 1.0 nm full scale per side automatically.
The IAF is in the Approach Transition operation area. The ACTIVE
annunciator will start flashing when you are within 3 nm inbound to the
FAF and not on hold. When you are 2 nm from the FAF, CDI sensitivity
will gradually scale from 1.0 to 0.3 nm full scale per side automatically.
Approach Active operation begins when you cross the FAF and ends when
you cross the MAP. The CDI is at 0.3 nm full scale per side. The OBS/HOLD
Annunciator is on steady. The ACTIVE annunciator is on steady. If the
ACTIVE annunciator is not on steady, do NOT continue the approach.
Approach Transition operation begins again when you cross the
MAP. Decide whether you are going to land or perform a missed
approach. If you are performing a missed approach procedure, press
the OBS/HOLD annunciator to enable waypoint sequencing. The CDI
will scale back to 1.0 nm.
Waypoint Arrival Alert
A standard Waypoint Arrival Alert message is generated when you
reach each approach waypoint. Press the MSG button to view and
acknowledge the message. Information for navigating to the next
waypoin. Generally you will then press the NAV button to return to the
navigation displays. The Waypoint Alert indicates that you are close
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