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INRAT Instrument Rating · Question

What is the primary function of an Outer Marker (OM) beacon during an ILS approach?

The Outer Marker primarily indicates the Final Approach Fix (FAF) on an ILS approach, typically located 4 to 7 NM from the threshold, and is identified by a slo

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Question: What is the primary function of an Outer Marker (OM) beacon during an ILS approach?

Answer options:

  • To indicate the Final Approach Fix (FAF) and provide a continuous tone.
  • To indicate the Middle Marker (MM) and provide a fast-paced tone.
  • To indicate the Missed Approach Point (MAP) and provide a slow-paced tone. ✅ To provide a fixed point approximately 4 to 7 NM from the runway threshold, usually co-located with the FAF, and transmit a slow-paced tone (dashes).

Correct answer: To provide a fixed point approximately 4 to 7 NM from the runway threshold, usually co-located with the FAF, and transmit a slow-paced tone (dashes).

Explanation: The Outer Marker primarily indicates the Final Approach Fix (FAF) on an ILS approach, typically located 4 to 7 NM from the threshold, and is identified by a slow Morse code tone (dashes) and a blue light.

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