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Keeping Me in Suspense

As an active instrument instructor, I frequently see confusion in my customers about making the transition from an approach to the missed-approach procedure using a GPS. Even many pilots with a great deal of instrument time don’t demonstrate mastery of a GPS navigator’s “suspend” mode, or know how vital its proper use is to safely executing a missed approach.

Gemini Sparkle

Key Takeaways:

  • GPS navigators automatically enter "suspend mode" at the Missed Approach Point (MAP) during a missed approach to halt automatic waypoint sequencing, as they cannot predict an aircraft's climb performance or safe turning altitude.
  • Pilots must manually fly straight ahead and climb to the specified safe "turn altitude" before exiting suspend mode (e.g., by pressing the OBS button) to allow the GPS to safely provide guidance for the remainder of the missed approach.
  • Exiting suspend mode prematurely is a common and dangerous error, as it can cause the GPS to direct the aircraft into obstacles or conflicting airspace before it's safe to turn.
  • Thoroughly briefing the entire instrument approach procedure, including the specific missed approach requirements and altitude callouts, is crucial for safe execution.
See a mistake? Contact us.

As an active instrument instructor, I frequently see confusion in my customers about making the transition from an approach to the missed-approach procedure using a GPS. Even many pilots with a great deal of instrument time don’t demonstrate mastery of a GPS navigator’s “suspend” mode, or know how vital its proper use is to safely executing a missed approach.

Basically, a GPS navigator in normal operation always is navigating to the next fix. But when it arrives at a missed approach point, it doesn’t know what to do: sequence to the destination airport, to the holding fix or do something else? So, it goes into suspend mode. Of course, there’s more to it than that, so let’s review how the GPS suspend function protects you, and how you must use it to assure a safe “missed.”

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