Australia CASA Instrument Proficiency Practice Exam 2025 – All-in-One Guide to Master Your CASA Certification!

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What obstacle clearance is provided by the 10nm and 25nm Minimum Safe Altitudes (MSAs)?

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The 10nm and 25nm Minimum Safe Altitudes (MSAs) provide a vertical obstacle clearance of 1,000 feet. This clearance is designed to ensure that, in the event of an emergency or during a visual approach, pilots can safely navigate through the airspace without the risk of colliding with terrain or obstacles within a defined radius of the MSA.

MSAs are crucial for both situational awareness and safety. The 1,000-foot clearance is particularly significant because it allows for variations in terrain elevation and ensures that aircraft have a buffer zone, which provides more safe operational space, particularly in areas where there might be high terrain or obstacles. Thus, the 1,000-foot clearance height is an established standard that ensures pilot confidence and safety while flying in potentially challenging environments.

Understanding this concept is vital for pilots to effectively interpret and utilize MSAs in flight operations.

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1500'

2000'

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