Which statement correctly describes the final reserve for a reciprocating engine in TTCAFE?

Which statement correctly describes the final reserve for a reciprocating engine in TTCAFE?

• A. 5 minutes of flight time
• B. 45 minutes of cruising fuel for reciprocating engines
• C. 30 minutes of fuel
• D. 60 minutes of reserve fuel

Answer: (B)

Final reserve fuel is the safety buffer added to your planned trip fuel to cover delays, headwinds, or the need to divert and still reach a safe landing. In TTCAFE, for reciprocating engines, this final reserve is defined as 45 minutes of cruising fuel. That means you carry enough fuel to burn at a typical cruising rate for three-quarters of an hour, using normal cruise power settings, after accounting for trip fuel, contingency, and alternate fuel. This ensures you have a reliable cushion if things take longer than planned or if you need to hold or divert for any reason. Five minutes of fuel is far too small to provide a meaningful safety margin. Thirty minutes is a common figure in some contexts, but the standard final reserve for piston-engined aircraft in TTCAFE is 45 minutes. Sixty minutes exceeds the typical required reserve and isn’t the standard specification here.

Final reserve fuel is the safety buffer added to your planned trip fuel to cover delays, headwinds, or the need to divert and still reach a safe landing. In TTCAFE, for reciprocating engines, this final reserve is defined as 45 minutes of cruising fuel. That means you carry enough fuel to burn at a typical cruising rate for three-quarters of an hour, using normal cruise power settings, after accounting for trip fuel, contingency, and alternate fuel. This ensures you have a reliable cushion if things take longer than planned or if you need to hold or divert for any reason.

Five minutes of fuel is far too small to provide a meaningful safety margin. Thirty minutes is a common figure in some contexts, but the standard final reserve for piston-engined aircraft in TTCAFE is 45 minutes. Sixty minutes exceeds the typical required reserve and isn’t the standard specification here.