A (increase) and C (no change) are wrong because higher temp reduces performance. Between B (-10%) and D (-20%): For a 15°C rise from +30°C to +45°C, performance charts typically show ~10‑12% reduction in max take‑off mass. Correct answer: B. Final Tip The ATPL exam does not test memorisation of isolated facts – it tests integrated decision‑making under time pressure. Train yourself to read every question like a mini flight scenario. If a question seems too easy, re‑read it: there is usually a hidden constraint.
Sea level, field length limited (not obstacle limited). Higher OAT reduces air density → lower engine thrust and lower lift → need longer take‑off distance for same mass → to stay within same field length, mass must decrease. atpl exam questions
A) Increases by approx. 5% B) Decreases by approx. 10% C) No change D) Decreases by approx. 20% A (increase) and C (no change) are wrong