Approach Notes

underlying approach. There are many GPS overlay approaches, such as the VOR or GPS-B approach to Wenatchee Washington, where there is no FAF inbound. The EAT VOR is the Initial Approach Fix (IAF), Final Approach Fix (FAF), Missed Approach Point (MAP), and Missed Approach Holding Point (MAHP). When there is no FAF inbound waypoint for a GPS approach, it is necessary to add one so that the equipment can do these TSO required tasks. This equipment-required FAF is called a sensor FAF and it is always located on the final approach course prior to the MAP. If there is already a named waypoint which can be used, it becomes the sensor FAF. If not, a sensor FAF waypoint is created. In the Wenatchee approach example, this waypoint is named FF285. FF285 is the sensor FAF and the inbound course for the approach is 285°. FF285 appears on the Jeppesen approach procedure chart, but not on the National Ocean Service (NOS) approach procedure chart for this approach.

This is especially important to understand when a procedure turn or course reversal is required. If you are inbound from the CASHS intersection, a procedure turn is required. You must execute this procedure turn on your Apollo GX relative to FF285, the TSO C129a FAF, not relative to the EAT VOR as depicted on the NOS chart as it is necessary to cross this sensor FAF waypoint inbound in order for the Apollo GX to go approach active (approach active annunciator lit) and allow you to complete the approach. This is clearly depicted on the Jeppesen approach procedure chart.

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