Reduced/FLEX thrust for Takeoff is NOT authorized when which condition is present?

Reduced/FLEX thrust for Takeoff is NOT authorized when which condition is present?

• A. Contaminated Runway with standing water, slush, snow, or ice
• B. Antiskid system is inoperative
• C. Bleeds - Wing and/or cowl anti-ice bleed are in use
• D. Downdrafts - Windshear warnings

Answer: (A)

Reduced/FLEX takeoff thrust is a derated power setting used to save wear and fuel, but it relies on predictable runway performance. On a contaminated runway with standing water, slush, snow, or ice, friction is uncertain and braking versus acceleration margins are reduced. In those conditions, the aircraft may not meet required takeoff and stop performance with FLEX, and the risk of insufficient climb gradient or longer than acceptable takeoff/abort distances increases. For safety, full takeoff thrust is required to ensure the necessary performance margins are met when the surface is contaminated. The other listed conditions affect different systems or contingencies and do not by themselves necessitate rejecting FLEX in the same way, though they would prompt other checks or precautions as appropriate. On a dry or clean surface, FLEX can be considered within the airline’s procedures, but contaminated surfaces prohibit it to maintain safe performance margins.

Reduced/FLEX takeoff thrust is a derated power setting used to save wear and fuel, but it relies on predictable runway performance. On a contaminated runway with standing water, slush, snow, or ice, friction is uncertain and braking versus acceleration margins are reduced. In those conditions, the aircraft may not meet required takeoff and stop performance with FLEX, and the risk of insufficient climb gradient or longer than acceptable takeoff/abort distances increases. For safety, full takeoff thrust is required to ensure the necessary performance margins are met when the surface is contaminated.

The other listed conditions affect different systems or contingencies and do not by themselves necessitate rejecting FLEX in the same way, though they would prompt other checks or precautions as appropriate. On a dry or clean surface, FLEX can be considered within the airline’s procedures, but contaminated surfaces prohibit it to maintain safe performance margins.