What is the maximum takeoff/landing temperature limit above ISA for TO/LND?

What is the maximum takeoff/landing temperature limit above ISA for TO/LND?

• A. ISA + 25°C (47°C)
• B. ISA + 35°C (52°C)
• C. ISA + 40°C (60°C)
• D. ISA + 45°C (70°C)

Answer: (B)

Takeoff and landing limits above ISA are about staying within the environmental conditions the airplane’s performance data and systems were certified to handle. For this aircraft, the published maximum ambient temperature for TO/LND is ISA plus 35°C. That sets a real-world cap of about 52°C. Staying within this limit keeps thrust, lift, engine/bleed system operation, and air conditioning within the tested envelope so the performance charts remain valid. Pushing beyond this temperature means operating outside the certified data, where margins and performance guarantees aren’t established.

Takeoff and landing limits above ISA are about staying within the environmental conditions the airplane’s performance data and systems were certified to handle. For this aircraft, the published maximum ambient temperature for TO/LND is ISA plus 35°C. That sets a real-world cap of about 52°C. Staying within this limit keeps thrust, lift, engine/bleed system operation, and air conditioning within the tested envelope so the performance charts remain valid. Pushing beyond this temperature means operating outside the certified data, where margins and performance guarantees aren’t established.