According to PPL standards, what is the acceptable range for climb-out speed during VY?

The acceptable range for climb-out speed during VY under Private Pilot License (PPL) standards is indeed expressed as +10 to -5 knots. This range reflects a tolerance for variations in airspeed while still ensuring that the aircraft is climbing efficiently.

VY, or best rate of climb speed, is critical as it allows the aircraft to gain the maximum altitude in the shortest period of time. Maintaining this speed within the specified range ensures that the aircraft operates safely and effectively during the climb phase.

The positive margin of +10 knots acknowledges that small variations above the recommended VY speed can still provide effective climb performance without greatly affecting safety or climb efficiency. The negative margin of -5 knots offers some leeway for unavoidable fluctuations in speed, allowing pilots the flexibility to adjust while ensuring that the climb remains optimized.

Understanding this acceptable speed range is fundamental for new pilots, as it instills the importance of speed management during critical phases of flight.