MK.3A/B  &  3C FLIGHT HELMETS  

by   Mart Aviation   

 SPECIFICATIONS &  SIZES 

The Mk.3C supercedes the Mk.1A/G also the MK.2A & 3A/B type helmets & will cover in one basic design a helmet for aircrews concerned with low & high altitude (rotary & fixed wing) with or without ejection seats. The rigid outer shell of moulded glass fibre resinate is provided with a lining of shock absorbing cork. An internal cradle of nylon webbing minimises the transmitted force & distributes it over as large an area of the head as possible. The soft comfortable padded lining is replaceable & its attachment to the shell forms a windproof seal, which together with the chinstrap, visor & oxygen mask ensures security of the helmet under severe blast conditions. The attachment of lining to shell is so contrived that the lining can be removed either for replacement or for access to the avionic equipment or other interior fittings. A single miniature telephone No.13775 feeds the signal via sound tubes to acoustically designed ear capsules,the capsules on an adjustable light spring wire suspension can be held away from the face when donning the helmet but seal snugly on the head when tensioned by the chin & neck strap. The telephone is fully tropicalised & wound to give impedance of 300 OHMS. & DC. Resistance of 105 OHMS. The microphone plug is conveniently situated low down on the cheek & accepts the standard socket ref. 10H/14207.Headset seals & cable assembly are all replaceable either complete or as separate items. The oxygen mask attachment hooks are designed for use with a chain toggle harness MK.5 as on the P & Q type masks. (The P.& Q types are identical in design & differ in size of facepiece, Q being smaller). These attachments are fully adjustable, the knurled adjusters are immediately behind the fitting hooks. The MK.3C Helmet has a double visor system with a side mounted polycarbonate inner visor for blast & bird strike debris & an outer independently positioned anti-glare visor, both superimposed on common pivots. The inner blast visor is held down by a side mounted locking device. The MK.3A/B helmet has a single visor which locks in various positions on the centre rail, these visors were issued in various tints from clear to dark tinted. 

MK.3 series  Helmet Sizes

Small............53 - 56cm...(21" / 22")......6½- 7

Medium........56 - 59cm...(22" / 23").....7 - 7¼

Large........59 - 62cm...(23" / 24" )......7¼ - 7½

Back to 3C Helmets        3C Helmets Reconditioned        3C Helmets NEW