Gentex HGU-84/P, Инструкция по эксплуатации и обслуживанию

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CHAP TER 2
PREP A RA TION FOR USE
2-1 SIZING
To se lect the proper size hel met shell as sem bly
for the aircrew mem ber, pro ceed as fol lows:
NOTE
Ideally, aircrew mem bers will wear the
same size hel mets as in pre vi ous
des ig na tions. How ever, if a good fit is
not pos si ble, ad di tional siz ing pro ce dures
may be re quired.
1. If hel mets are avail able, aircrew mem ber
should trial-fit to de ter mine cor rect size to be
or dered. If hel mets are not avail able, mea -
sure the cir cum fer ence of the head with a
tape mea sure as shown in Fig ure 2-1. Re fer
to Ta ble 2-1 as a guide for siz ing.
NOTE
Sizing in struc tions are pro vided only as gen eral guid ance. Be cause of the
wide vari a tion in head shapes likely to be en coun tered, it is not pos si ble to
pres ent de tailed guid ance. The hel met is de signed to pro vide light weight
head pro tec tion and should fit close to the head. For this rea son, aircrew
mem bers should be fit ted with the small est hel met size that pro vides an
ac cept able fit.
2. Once the cor rect size has been de ter mined, req ui si tion the hel met shell as sem bly
through nor mal sup ply chan nels.
Ta ble 2.1. HELMET SHELL AS SEM BLY SIZING GUIDE
CIR CUM FER ENCE (INCHES/MIL LI ME TERS) SHELL AND LINER SIZE RE QUIRED
Less than 21-1/2 in. (546 mm.) Me dium
21-1/2 to 22-1/2 in. (546 to 571 mm) Large
22-1/2 to 23-1/2 in. (571 to 596 mm) or more X-Large
23-1/2 in. (596 mm) or more X-Large Wide
2-1
Fig ure 2-1. Head Cir cum fer ence
for Hel met Sizing