British G-Type Partial Pressure Aircrew Flying Helmet
Used for flying at high altitudes in conjunction with a pressure jerkin, in case of a cabin depressurisation. This equipment would allow the aircrew to "get down" safely.
Made by the GQ Parachute company, it is of fabric and rubber construction. It is very similar in appearance to the D-type partial pressure helmet, but includes an aluminium frame around the visor.
The purpose of the partial pressure helmet and Jerkin is to attempt to equalise the pressure in the aircrew's lungs with that applied to the outside of the body. This is particualrly important under cabin de-pressurisation at high altitude, where the pressure differential would be large.
The helmet (much like the pressure jerkin) contains bladders to exert pressure on the head, equal to the oxygen supply pressure at all times.
Images
Thses images the a complete G-Type partial pressure helmet with outer shell and visor Mk2.
Service Images
Maurice Rose Meyer
Posing next to an as yet unidentified aircraft (possibly a Canberra), test pilot Maurice Rose Mayer and another pilot are wearing GQ G-Type partial pressure helmets (without outer shells) and pressure jerkins.
