Which statement is true regarding APPR or NAV mode usage?

Which statement is true regarding APPR or NAV mode usage?

• A. APPR mode is used to intercept the localizer
• B. NAV mode is used to join the approach
• C. APPR mode is used for missed approach guidance
• D. NAV mode is used after landing

Answer: (B)

NAV mode is used to join the approach because you tune the localizer (or RNAV course) and let the autopilot follow that course to the approach path. Intercepting and tracking the localizer is accomplished in NAV mode, which gets you established on the approach course and into the published procedure. Once you’re on the localizer and within range to follow the vertical path, you arm APPR to fly the approach itself. APPR mode then provides the vertical guidance (glideslope for an ILS, or the RNAV/VNAV path) and keeps you aligned with the final approach segment. APPR isn’t used to intercept the localizer itself; that intercept happens in NAV mode. Missed approach guidance isn’t provided by APPR; it’s a separate procedure you execute when instructed or required. After landing, you’d simply complete the approach and disengage as needed.

NAV mode is used to join the approach because you tune the localizer (or RNAV course) and let the autopilot follow that course to the approach path. Intercepting and tracking the localizer is accomplished in NAV mode, which gets you established on the approach course and into the published procedure.

Once you’re on the localizer and within range to follow the vertical path, you arm APPR to fly the approach itself. APPR mode then provides the vertical guidance (glideslope for an ILS, or the RNAV/VNAV path) and keeps you aligned with the final approach segment. APPR isn’t used to intercept the localizer itself; that intercept happens in NAV mode.

Missed approach guidance isn’t provided by APPR; it’s a separate procedure you execute when instructed or required. After landing, you’d simply complete the approach and disengage as needed.