When is APR armed on takeoff?

When is APR armed on takeoff?

• A. Within 4% of target thrust
• B. Within 6% of target thrust
• C. Within 8% of target thrust
• D. Within 10% of target thrust

Answer: (C)

APR is designed to monitor and potentially adjust thrust to meet the planned takeoff target, but it won’t engage right away. It arms only when your actual thrust comes close enough to the calculated target so that small changes won’t trigger unnecessary corrections. That threshold is eight percent of the target thrust. Being within this window lets APR be reliable—close enough to act if needed, but not so eager that it fights you during the early roll or with normal throttle wiggle. If the band were tighter, say four or six percent, arming could be too sensitive to normal fluctuations and engine lag; if it were looser, like ten percent, it could arm too early and start making adjustments when you don’t need them. So eight percent is the sweet spot for arming APR on takeoff.

APR is designed to monitor and potentially adjust thrust to meet the planned takeoff target, but it won’t engage right away. It arms only when your actual thrust comes close enough to the calculated target so that small changes won’t trigger unnecessary corrections. That threshold is eight percent of the target thrust. Being within this window lets APR be reliable—close enough to act if needed, but not so eager that it fights you during the early roll or with normal throttle wiggle. If the band were tighter, say four or six percent, arming could be too sensitive to normal fluctuations and engine lag; if it were looser, like ten percent, it could arm too early and start making adjustments when you don’t need them. So eight percent is the sweet spot for arming APR on takeoff.