Which value is NOT a correct operational limit for takeoff and landing?

• A. Minimum ambient temperature -40°C
• B. Bleed air from the APU not permitted above 25,000 ft
• C. Direct tailwind 12 knots
• D. Flaps 30 speed 185 KIAS

Answer: (C)

The idea being tested is how takeoff and landing limits cover wind, temperature, and equipment use to keep performance safe. A direct tailwind limit is a specific operational parameter: it caps how much tailwind is allowed during takeoff or landing because tailwind increases landing distance and reduces braking effectiveness, making a safe stop or stop/go decision harder. In most airplane manuals, the maximum tailwind component for both takeoff and landing is about 10 knots. A direct tailwind of 12 knots would exceed that published limit, so it isn’t an allowed operating condition.

The other values fit common published limits: a minimum ambient temperature of -40°C is a recognized lower operating limit in many aircraft manuals; APU bleed air restrictions often state it isn’t permitted above a certain altitude (here, 25,000 ft) to manage bleed air source and system limits; and a flap setting of 30 having a maximum speed around 185 KIAS is a standard flap-configuration limit for safe handling and structural reasons.