A gas turbine engine having an active combustion control system including a sensor element positioned proximate the combustion chamber as part of a sensor assembly including a spring-action bellows. The aluminum structural members are preferably made from an extrusion process making the tailgate light and strong as well as cost effective. Alternatively, the cells of the honeycomb may be vertical convective air currents will flow under the wall of the enclosure, with or without the aid of a fan, the vertically directed cells of the honeycomb creating a chimney effect to dissipate the heat.