Abstract: A method of power switching includes receiving a command from an external aircraft controller to power an aircraft load from an aircraft voltage bus. The method includes in response to the command from the external aircraft controller, controlling a relay to connect or disconnect an aircraft voltage bus from an aircraft load. Controlling the relay includes current monitoring the relay and voltage monitoring the relay power switching. The method can include receiving temperature feedback indicative of temperature of the relay, and using the temperature feedback for at least one of controlling the relay and/or prognostic and health monitoring. The method can include outputting feedback to the external aircraft controller relating to status, operation, and health of the relay.

Abstract: A portable communication device includes a subscriber identity module (SIM) card having a memory and a processor, a device-activity SIM application toolkit (SAT) application stored on the memory. When the device-activity SAT application is accessed by the processor and executed, the device-activity SAT application causes the SIM card to interface with the portable communication track device communication activity and/or device location, store device-activity data representative of the tracked device communication activity and/or device location, and upload the device-activity data to a remote device-activity server. The device-activity SAT application facilitates access to instantaneous device-activity data via device-activity data collection and uploading to a remote server accessible via the Internet.