Apparatus and method for testing a linear acuator

An apparatus in combination with a linear actuator;

• wherein the linear actuator comprises a first part moveably connected to a second part, and is configured to exert an actuation force in an actuation direction by movement of the first part relative to the second part;
• and
• wherein the apparatus is configured for in-situ testing of the linear actuator and comprises:
• a test device mounted on the linear actuator such that in an activated configuration of the linear actuator a first surface of the test device contacts the first part of the linear actuator and a second surface of the test device, which is moveable relative to the second surface of the test device in the actuation direction, contacts the second part of the linear actuator;
• a test actuator coupled to the test device and configured to exert a test force in a test direction opposite to the actuation direction, the test force being to drive movement of the second surface away from the first surface;
• and
• a measurement device for detecting a change in the distance between the first surface and the second surface, wherein the measurement device is integrated with the test device and/or the test actuator.

A method of testing of a linear actuator in-situ, wherein the linear actuator is configured to exert an actuation force in an actuation direction by movement of a first part of the linear actuator relative to a second part of the linear actuator, the method comprising:

• providing a test device on the linear actuator such that, in an activated configuration of the linear actuator, a first surface of the test device contacts the first part of the linear actuator and a second surface of the test device contacts the second part of the linear actuator;
• operating the linear actuator to exert the actuation force on the test device;
• operating the test device to apply a predetermined test force in a direction opposite to the actuation direction, the test force being to increase the distance between the first surface and the second surface;
• and
• detecting a change in a distance between the first surface and the second surface.