MIL-DTL-43511D
(This section contains information of a general or explanatory nature that may be helpful, but is
not mandatory.)
6.1 Intended use. The class 1, class 2, and class 3 visors are intended to be used on flight
helmets used by aircrew personnel.
6.2 Acquisition requirements. Acquisition documents should specify the following:
a. Title, number and date of this specification.
b. Class of visor required (see 1.2)
c. Issue of DODISS to be cited in the solicitation and, if
required, the specific issue of individual documents
referenced (see 2.2.1 and 2.3)
d. When first article is required (see 3.1)
e. When abrasion resistant coating is required (see 3.5.11)
f. Packaging requirements (see 5.1).
6.3 First article. When a first article is required, it will be inspected and approved under the
appropriate provisions of FAR 52.209. The first article should be a preproduction sample. The
contracting officer should specify the appropriate type of first article and the number of units to
be furnished. The contracting officer should also include specific instructions in acquisition
documents regarding arrangements for selection, inspection, and approval of the first article.
6.4 Coatings. All requirements for abrasion resisting coatings applied to polycarbonate visors
are included in this document.
6.5 Luminous transmittance. For the purpose of this specification, luminous transmittance is
defined as the ratio of the luminous flux transmitted by the visor to the luminous flux incident on
the visor. It is measured with a sensor corrected to compare with the photopic sensitivity of the
human eye without regard to specific wavelengths. ASTM D 1003 or a specified modification
thereof is a way of determining luminous transmittance. A CIE C source (average daylight) is
used to make the luminous transmittance measurements.
6.6 Spectral transmittance. For the purpose of this specification, spectral transmittance is
defined as radiant transmittance evaluated for a specific range of wavelengths of incident energy.
It is desirable that it be measured with an automatic recording spectrophotometer of the required
range of sensitivity and evaluated according to the applicable instructions.
6.7 Suggested source of supply. Navy has determined that Gentex Corporation is an acceptable
source for visors meeting the requirements stated in this document.
6.8 Subject term (key word) listing
Aircrew personnel
Armor
Eye protection
Flight
Shield
6.9 Changes from previous issue. Marginal notations are not used in this revision to identify
changes with respect to the previous issue due to the extent of the changes.
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