Which pair correctly matches the maximum altitude and the maximum altitude for single-pack operation?

• A. 41,000 ft; 31,000 ft
• B. 41,000 ft; 29,000 ft
• C. 40,000 ft; 31,000 ft
• D. 42,000 ft; 31,000 ft

Answer: (A)

Altitude ceilings scale with available power. When you have two packs, there’s more energy to climb and sustain flight at higher altitude, so the ceiling is higher. With only one pack, there’s less energy, so the ceiling is lower. The pairing that matches this relationship is a higher maximum altitude for dual-pack operation (41,000 ft) and a lower maximum altitude for single-pack operation (31,000 ft). Therefore, the correct matching is 41,000 ft for dual-pack and 31,000 ft for single-pack. The other options would either swap these ceilings or give inconsistent numbers that don’t reflect the decreased capability with a single pack.