What is a possible consequence of failing to calibrate the altimeter correctly?

• A. Improved fuel efficiency
• B. Accurate navigation only
• C. Potential altitude misreading
• D. Enhanced climb performance

Answer: (C)

One of the critical functions of an altimeter is to provide accurate altitude readings, which are essential for maintaining safe vertical separation from terrain and other aircraft. If the altimeter is not calibrated correctly, it can lead to a potential altitude misreading. This misreading means that a pilot may believe they are at a different altitude than they actually are.

For instance, if the altimeter is set to an incorrect pressure setting (such as forgetting to adjust for local barometric pressure changes), the aircraft could be flying too low or too high relative to the intended altitude. This could result in unsafe situations, such as increasing the risk of mid-air collisions or terrain avoidance issues.

Accurate altimetry is particularly vital during approaches and landings, where precise altitude information is crucial. Therefore, failing to calibrate the altimeter correctly can significantly compromise flight safety.