Fenn NG201 Night Vision Goggles are designed for use in fast jets.
They feature an auto-detach bracket powered by a gas motor housed within the mounting assembly to separate the NVGs from the helmet during the ejection sequence.
The electrical supply to the gas motor is taken from the ejector start assembly and routed to the mounting via electrical contacts fitted in the helmet mounting plate. These contacts interface directly with the associated electrical contacts on the gas motor assembly. It is possible to manually detach the NVG assembly from the helmet by using release levers mounted on each side of the unit.
This design also features a single inter-pupillary adjustment mechanism and has the on/off switch mounted on the right. Please note, a right hand side mounted switch mechanism is not suitable for use on a rotary wing aircraft.