Which statement compares the duration limits for normal two-engine takeoff versus APR one-engine power?

• A. Normal two-engine takeoff has the longer limit
• B. APR one-engine power has the longer limit
• C. They have the same limit
• D. There is no limit for APR

Answer: (B)

The key idea is how long you can safely hold a given thrust configuration during takeoff. In a normal two-engine takeoff, both engines are at full power and you’re expected to reach safe speed and establish climb quickly. That creates a relatively tight time window to complete the takeoff run. When you’re using APR one-engine power, you’re operating with a single engine at a reduced setting designed for an engine-out situation, which the system is built to sustain longer. Because thrust is limited but endurance is increased, the allowable duration is longer. So the statement that APR one-engine power has the longer limit is the best fit.