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The GPS 165 works in conjunction with a set of external switches and your HSI
to fly GPS approaches. The external switches are used to control GPS functions, and
contain illuminated annunciators to indicate when functions are active. Your installa-
tion must also have annunciators for waypoint arrival and GPS messages.
The GPS APPR switch is used to arm the GPS 165 for approach navigation.mode
after a desired approach has been selected. Once armed, the GPS 165 will begin auto-
matic CDI scaling and ensure that receiver autonomous integrity monitoring (RAIM)
is available to provide the required level of accuracy and satellite coverage during the
approach. The GPS APPR switch is used to deactivate an approach and return the CDI
scale to the 1 nm setting in the event of a missed approach between the FAF and the
MAP waypoints. You may also choose to keep the switch set to the ‘ARM’ position at
all times to simplify the approach procedure. Remember, arming a GPS approach only
prepares the GPS to transition to the active approach mode.
If you have selected an approach, the GPS 165 will prompt you to arm the
approach mode 30 nm from your destination airport, and again 3 nm before the final
approach fix if the approach has not been already armed. Once the GPS mode is
armed (you have selected an approach and set the GPS APPR switch to the ‘ARM’
position), the ARM annunciator will illuminate, and automatic CDI scaling will begin.
The GPS 165 will also automatically set the CDI scaling and automatic leg sequencing
features to their default settings (‘auto’ CDI scaling & auto leg sequencing ‘on’).
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APPROACH NAVIGATION
GPS Approach Switch
Arm Approach Mode
The external GPS APPR switch should be set to
the ARM position 30 nm from the destination air-
port. Once the approach is armed, the unit will
provide a smooth transition from the 5.0 to 1.0
nautical mile CDI scale, and down to 0.3 nm
within 2 nm inbound to the FAF.
GPS APPR
ARM ACTV
GPS APPR
ARM ACTV
165 manual 7/13/98 3:59 PM Page 63