FAA Military Competency Practice Exam

What is the barometric pressure threshold above which flight operations may not be authorized based on weather information?

1. 29.92 inches of mercury

2. 30.50 inches of mercury

3. 31.00 inches of mercury

4. 32.00 inches of mercury

The correct answer is: 31.00 inches of mercury

The barometric pressure threshold relevant to flight operations is an important operational standard, as it helps ensure safety and efficiency in aviation. Typically, 29.92 inches of mercury is the standard atmospheric pressure at sea level and is commonly used as a reference in aviation. The threshold indicates the maximum barometric pressure at which certain operational procedures, including specific flight operations, may not be authorized. With values exceeding this threshold, certain aircraft might be restricted from operating due to considerations such as performance limitations or regulatory constraints established for specific missions. In this context, a barometric pressure of 31.00 inches of mercury is considered to be a significant threshold because, at pressures higher than this, aircraft performance can be noticeably affected. This level serves as a critical indicator for determining whether weather conditions allow for safe flight operations, aligning with the need for precision in aviation protocols. Thus, operational guidelines often set such thresholds based on established procedures and safety regulations.