Before Takeoff Check
Private Pilot ACS · Area II · Task F · 14 CFR 91, POH/AFM, FAA-H-8083-3
Everything you need to know about Before Takeoff Check for your private pilot checkride. Aligned to FAA-S-ACS-6C Task II-F, covering before takeoff check.
Runup Sequence (Typical) §
• Mag check: From BOTH to each magneto individually. Max acceptable: 125 RPM drop per mag, 50 RPM differential between mags. Larger drop = fouled plug or failing magneto.
• Carb heat check: Apply full carb heat — expect RPM drop (normal = carb heat working). If RPM rises then drops back further = carb ice present and melting.
• Fuel selector on correct tank, primer locked.
• Mixture set per POH (full rich at low elevations).
• Flight controls: free and correct (not just free — verify correct deflection direction).
• Trim set for takeoff. Instruments set (altimeter, DI aligned with compass).
• Carb heat check: Apply full carb heat — expect RPM drop (normal = carb heat working). If RPM rises then drops back further = carb ice present and melting.
• Fuel selector on correct tank, primer locked.
• Mixture set per POH (full rich at low elevations).
• Flight controls: free and correct (not just free — verify correct deflection direction).
• Trim set for takeoff. Instruments set (altimeter, DI aligned with compass).
AFH Ch.2; POH
Takeoff Performance Review §
Before every takeoff, the ACS expects the pilot to have reviewed: takeoff distance required for current weight and conditions, obstacle clearance requirements, abort point (where you will stop if the takeoff is rejected), crosswind component versus aircraft limitation, and whether a go-around is possible if the landing is not satisfactory.
Rejected takeoff: If anything abnormal occurs below rotation speed — abort. Throttle idle, maintain directional control with rudder and brakes, stop on the runway if possible.
Rejected takeoff: If anything abnormal occurs below rotation speed — abort. Throttle idle, maintain directional control with rudder and brakes, stop on the runway if possible.
ACS PA.II.F.R4; POH