Lockheed C-5 Galaxy Operations Limits Practice Test

For Driftdown (2 or 3 Engine), what is the minimum indicated airspeed in knots?

240 250 230 260

Correct Answer:

250

Explanation:

Driftdown is the speed range you must maintain after losing two or three engines to ensure you have enough lift and control authority to safely descend. The minimum indicated airspeed for this engine-out condition is set to prevent control problems and stall as you operate with reduced thrust. For the C-5 in a two- or three-engine-out scenario, that minimum IAS is 250 knots. This value gives you the necessary margin to stay controllable and maintain safe flight with the remaining engines. Lower speeds, like 240 or 230 knots, would reduce wing lift and control effectiveness too far and risk a stall or loss of control. A speed of 260 knots is above the minimum, which would be acceptable but not the lowest safe speed specified for this case.

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