Garmin GPS 165TSO Pilot's Manual

Contents

The GPS 165 works in conjunction with a set of external switches and your HSIto fly GPS approaches. The external switches are used to control GPS functions, andcontain 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.modeafter 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 theapproach. The GPS APPR switch is used to deactivate an approach and return the CDIscale to the 1 nm setting in the event of a missed approach between the FAF and theMAP waypoints. You may also choose to keep the switch set to the ‘ARM’ position atall times to simplify the approach procedure. Remember, arming a GPS approach onlyprepares the GPS to transition to the active approach mode.If you have selected an approach, the GPS 165 will prompt you to arm theapproach mode 30 nm from your destination airport, and again 3 nm before the finalapproach fix if the approach has not been already armed. Once the GPS mode isarmed (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 sequencingfeatures to their default settings (‘auto’ CDI scaling & auto leg sequencing ‘on’).63APPROACH NAVIGATIONGPS Approach SwitchArm Approach ModeThe external GPS APPR switch should be set tothe ARM position 30 nm from the destination air-port. Once the approach is armed, the unit willprovide a smooth transition from the 5.0 to 1.0nautical mile CDI scale, and down to 0.3 nmwithin 2 nm inbound to the FAF.GPS APPRARM ACTVGPS APPRARM ACTV