4-11b. Fitting Procedure for HGU-56/P with the M45 CB Mask
INITIAL SETUP
Materials/Parts
General Safety Instructions
Helmet, Flyer’s, HGU-56/P (1680-ALSE-
101-1, -2, -3, -4, -5, -6)
Mask, Chemical-Biological: M45 (5-1-
2800-10, -20, -30, -40)
Lining, Helmet, Shock, M45 (5-1-2873-
10, -20, -30, -40, -50, -60)
Personnel Required
Operator wearing a properly sized and
fitted M45 Mask and HGU-56/P Helmet
Assembly with standard TPL
ALSE Specialist/Technician with ASI of
H2/Q2 (ALSE Qualified)
WARNING
Proper fitting of the helmet with
the M45 thermoplastic liner is
essential to the functioning
of the HGU-56/P when used with
the M45 Mask, all of its
modules, and the safety of the
operator. Take as much time as
necessary to install and fit the kit
properly. Use extreme
care in checking fit.
Tools/Equipment
Intercommunications Unit (1680-ALSE-
181-1)
M-170 Adapter ( 1680-ALSE-257-1)
PREPARING THE HELMET
NOTE
If optical systems, Aviator’s Night Vision Imaging System (ANVIS) or AH-l are to
be used, check helmet fit with optical systems attached.
During the fitting, the operator must wear a properly sized, fitted. and adjusted M45
Mask. Have the operator don the mask before donning the helmet.
In preparation for the fitting procedure, operator’s with long hair should arrange
their hair so that it lies flat and is completely covered by the helmet. Elevated hair
styles such as buns or French braids will prevent proper fitting of the helmet. The
helmet must be worn the same way thereafter.
Change 1
4-14.1
