A controllability check is performed after which scenario?

A controllability check is typically performed after an event that compromises the integrity of the aircraft or its systems, such as a bird strike or structural damage. This is because these situations can result in significant alterations to the aircraft's aerodynamic properties or control surfaces, potentially affecting the pilot's ability to maintain control of the aircraft. The aim of a controllability check is to assess the aircraft's handling characteristics and determine if it remains safe and manageable for flight post-incident.

In the context of a bird strike or structural damage, it is crucial to verify that the aircraft can still be operated safely. Pilots must ensure that the control inputs result in the expected flight responses, making it vital to perform these checks after such events to avoid putting the aircraft and passengers at risk.

On the other hand, while engine failures and cabin pressure failures certainly require immediate attention and specific emergency procedures, they do not directly necessitate a controllability check in the same way structural damage does, and low fuel conditions are usually addressed through fuel management rather than a controllability assessment.