Instrument Rating Checkride Practice Test

Which color identifies the Outer Marker (OM)?

1. Red

2. Amber

3. Blue

4. White

The correct answer is: Blue

The Outer Marker (OM) is identified by a blue light. This illumination signifies a specific location along the approach to a runway, particularly for an instrument landing system (ILS) approach. The blue light serves as a marker indicating when the aircraft is at a certain distance from the airport, typically at a distance of around 4 to 7 miles, depending on the specific airport and approach procedure. It's essential for pilots to recognize the significance of the Outer Marker, as it helps them maintain situational awareness during their approach and ensures they are on the correct path towards landing. While other colors are used for different markers or signals within aviation, such as red or white for other navigational aids, the blue color distinctly signifies the Outer Marker in proximity to the runway during an instrument approach. Understanding these color codes is crucial for safe navigation in instrument conditions.