GUENEAU ZEUS C
During the mid-1980s, the Swiss AF was looking for an aircraft suitable to replace the Mirage III. Among those evaluated the Northrop F-20, Mirage 2000, F-16 and the F/A-18, the evaluation winner.
Due to the ever-improving performance and air combat tactics, pilots were increasingly exposed to high acceleration. As a result, according to the Dübendorf FAI (Fliegerärtzliches Institut - Aero Medical Institute), spinal disorders were increasing observed with the weight of the pilot's helmet/mask system playing an important role.
The FAI consequently proposed to the AF to evaluate/ purchase new lightweight helmet and mask systems, with the lowest possible weight, optimal centre of gravity and good wearing comfort.
For more details about the evaluation, see HERE
The helmet's low weight, stability, comfort, visibility, and mobility in the cockpit were positively rated, nevertheless some problems were detected:
• The distance between helmet crown - ear cups to be too small, so the ears not completely enclosed - reduced noise attenuation;
• Helmet “sitting high” on the back of the head;
• The distance between pilot's face and the inner visor being too small, preventing wearing glasses.
The evaluation had no winner; none of the systems tested fully met the requirements.
Below a scan of the cover of the September 1989 issue of “Aero Revue" magazine. It features Pilatus chief test pilot Hans Galli, wearing a combo ZEUS/MP90 on board a Pilatus PC-9.