The second and more "classic" modification, was the "gullwing cut" to improve pilot's visibility. This modification was initiated by the former chief instructor of air combat and proved to be more successful than a third proposal described below.

The third modification consisted in cutting and re-shaping the rear edge of the helmet in order to improve the pilot's capability to move his head upwards towards the vertical axis.

This proposal was rejected by the Air Force Medical Institute reportedly due to a major exposure to possible injury of the pilot's head.

Despite the refusal, some pilots personally modified their helmets, anyway.

The picture above gives an example of a not modified (LH) and a modified (RH) H-5.

Fourth modification, installation of a British built visor, as the one fitted on the MK-1 helmet.

Visor components.

The visor also underwent modification. It was grinded/sanded in order not interfere with the MS22001 oxygen mask and the oxygen mask receivers fitted on helmet. This picture shows a visor with original shape cut.

All Swiss AF pilot equipment part numbers carried the acronym P.A.

(Pilotenausruestung)

The purpose of the rear side installed switch was to select comms between oxy mask (LH) and boom mike (RH).

The boom mike fitting.

MA/6U boom mike.

Headset installation.

Headset position was adjusted and damping was carried out by means of handmade leather cushions fitted as required with rubber foam disks of various thicknesses.

A view of the original wiring harness.

During the restoration of such a flight helmet the original US Navy gold color often surfaces from under the later applied white paint livery.