What is the minimum spoiler deployment speed?

What is the minimum spoiler deployment speed?

• A. 170 kts
• B. 175 kts
• C. 180 kts
• D. 190 kts

Answer: (C)

Spoilers rely on airflow to move into the deployed position and to provide effective lift reduction and drag. There’s a defined airspeed at which the spoiler system will allow deployment to ensure the panels extend reliably and the airplane remains controllable. Below that speed, the dynamic pressure isn’t enough for proper actuation or for the spoiler to produce the expected aerodynamic effect, so the system prevents deployment to avoid unstable handling or insufficient braking capability. Among the given options, the correct choice is the one that corresponds to the higher threshold. The lower speeds would be below the minimum required airflow, meaning spoilers would either not deploy or would not function effectively. In other words, the minimum speed is set high enough to guarantee reliable spoiler operation, which is why the higher option is the right one.

Spoilers rely on airflow to move into the deployed position and to provide effective lift reduction and drag. There’s a defined airspeed at which the spoiler system will allow deployment to ensure the panels extend reliably and the airplane remains controllable. Below that speed, the dynamic pressure isn’t enough for proper actuation or for the spoiler to produce the expected aerodynamic effect, so the system prevents deployment to avoid unstable handling or insufficient braking capability.

Among the given options, the correct choice is the one that corresponds to the higher threshold. The lower speeds would be below the minimum required airflow, meaning spoilers would either not deploy or would not function effectively. In other words, the minimum speed is set high enough to guarantee reliable spoiler operation, which is why the higher option is the right one.