Set the published front course

Confirm the chart

Identify the published front course.

Identify the localizer back-course procedure, the published front course, altitude restrictions and missed approach.

Select the coupled side

Set SRC to the coupled side and tune that side’s receiver. Select LOC as the navigation source, or use LOC preview while FMS remains selected, as described by FSS.

Set the course

FSS says to use the localizer front course for the back-course setup. Cross-check the setting with the chart.

Position for intercept

Select HDG and use the cleared intercept heading and altitude. Check the active lateral mode and the aircraft’s position relative to the localizer.

Arm guidance

FSS describes using NAV or APP to arm the applicable mode. Watch the FMA: depending on the geometry, LOC may initially appear before BC.

Verify capture

FSS says glideslope capture is inhibited.

Confirm the actual lateral tracking. FSS says glideslope capture is inhibited on a back-course approach, so manage the vertical profile using the published procedure and appropriate guidance.

FSS says LOC may arm first when the heading is less than 100° from the front course. The armed indication changes to BC once the heading is more than 100° from it. CDI sensing reverses automatically. FSS describes capture when BC is armed and the localizer deviation comes alive within approximately 0.9 of full scale. Watch the FMA and the actual tracking. ^[37]