According to NASA, what percentage of errors leading to accidents begin in preflight?

• A. 50%
• B. 60%
• C. 80%
• D. 90%

Answer: (C)

Preflight planning and preparation shape the entire flight; NASA reports that about 80% of errors that lead to accidents begin before the aircraft leaves the ground. This shows why thorough preflight checks are crucial in attitude instrument flying: you’re confirming weather and route, fuel requirements, weight and balance, and that all instruments and systems are functioning and correctly configured (altimeter setting, pitot-static system checks, etc.). When something isn’t right during preflight, it can set up hazardous conditions that cascade once you’re airborne, especially in instrument conditions where you rely on precise readings and procedures. Catching and correcting issues on the ground greatly reduces the likelihood of in-flight errors and risky situations.