Airman Certification Standards
ACS PA.X.A
Maneuvering with One Engine Inoperative (AMEL, AMES)
Knowledge
Factors affecting minimum controllable speed (VMC).
VMC (red line) and best single-engine rate of climb airspeed (VYSE) (blue line).
How to identify, verify, feather, and secure an inoperative engine.
Importance of drag reduction, including propeller feathering, gear and flap retraction, the manufacturer's recommended control input and its relation to zero sideslip.
Feathering, securing, unfeathering, and restarting.
Risk Management
Potential engine failure during flight.
Collision hazards.
Configuring the airplane.
Low altitude maneuvering, including stall, spin, or controlled flight into terrain (CFIT).
Distractions, task prioritization, loss of situational awareness, or disorientation.
Skill
Recognize an engine failure, maintain control, use manufacturer’s memory item procedures, and use appropriate emergency procedures.
Set the engine controls, identify and verify the inoperative engine, and feather the appropriate propeller.
Use flight controls in the proper combination as recommended by the manufacturer, or as required to maintain best performance, and trim as required.
Attempt to determine and resolve the reason for the engine failure.
Secure the inoperative engine and monitor the operating engine and make necessary adjustments.
Restart the inoperative engine using manufacturer’s restart procedures.
Maintain altitude ±100 feet or minimum sink rate if applicable, airspeed ±10 knots, and selected headings ±10°.
Complete the appropriate checklist(s). Private Pilot for Airplane Category ACS (FAA-S-ACS-6C)59
Retrieved from ecfr.gov on July 17, 2026.