misejection

Misejection is a term used in certain technical and engineering contexts to describe an ejection event that does not occur as intended or occurs in an unintended manner. The word is formed from mis- plus ejection, and there is no single standardized definition; its meaning varies by domain and usage.

In aerospace and defense, misejection may refer to a mis-timed, misdirected, or otherwise faulty ejection of a payload, stage, or safety device. This can include ejector mechanisms, separation events, or deployment modules where timing, orientation, or velocity depart from design specifications, potentially posing safety risks or jeopardizing mission success.

In manufacturing and robotics, misejection can describe an improper expulsion or release of a component, part, or material from tooling, grippers, or ejector devices. Such events can cause damage to parts, jeopardize product integrity, or create safety hazards for operators.

Causes of misejection typically include control-system errors, sensor faults, software bugs, mechanical wear, or maintenance deficiencies. Consequences range from mission or process disruption to safety incidents and equipment damage. Prevention usually involves rigorous testing, redundancy, precise alignment of sensors and actuators, and clear operating procedures.

Terminology and usage vary by field; some writers prefer more specific terms such as misdeployment, misrelease, misfiring, or misseparation, depending on the context. Misejection remains a descriptive label rather than a universally adopted technical term across industries.

Related terms include ejection, misdeployment, misfire, and ejecta.