A lens support structure includes a tubular holding frame a flat holding surface orthogonal to a center axis of the frame, and a lens held within the holding frame with a planar part, orthogonal to the optical axis of an optically functioning surface, abutting the holding surface. The protocol outlines a specific sequence of events in order to ensure failsafe incorporation of a fuel shut off valve assembly within the low pressure turbine area and specifically within the engine casing of the turbo fan. The power amplification circuit selectively activates individual amplifier elements by, for example reducing power or increasing power to at least one amplifier element. Each of the modules is adapted for communication with at least one specific type of hearing assistance device. The soft SIM data has a one to one relationship with the device. As the tread wears, the inner tread layer defines a greater proportion of a running surface of the tread.