MIL-HDBK-1027/4A
electrical actuation to simulate functions. Electrical power for NAMT
equipment usually matches actual naval aircraft power characteristics of
200Y/115 volt, three phase, 400 cycle with 28 volts direct current. Some
training facilities use "hybrid" trainers which use actual hands-on equipment
with computer enhancement. Hybrid systems are usually operated from a PC or
mini/microcomputer which requires the same air conditioning needs as other
automated data processing (ADP) systems. Totally PC based ICW may be used
with dual touch screen.
Maintain a continuing update of the proposed equipment with the
user, to ensure all items are current and are adequately accommodated in the
design.
3.3.3.2
Audiovisual Requirements
a) Rear Screen Projection. Rear screen projection is discouraged
in light of improved state-of-the-art media and additional space
requirements. Where rear screen projection is essential, provide at least 6
feet clear space width behind the screen, which can accommodate the
projection path and serve as media storage and instructor work space.
b) Presentation Hardware and Projection Systems. Personal
computer (PC) based digitizing graphics hardware and projectors are current
state-of-the-art media for visual aids in the classroom.
c) Slide and Overhead Projectors. Provide stowage space for
portable carts. See concerns for aspect ratios below.
d) Projection Screens. Base selection of permanently mounted or
stand alone screens on user preference. Permanently mounted screens can
limit chalkboard area. Base justification of electrified projection screens
on local requirements; however, maintenance and repair costs must be
considered. Successful visual presentations depend on arrangements of the
chalkboard and projection screen relative to the seating configuration.
1) Avoid visual obstructions. Provide clearspan structural
systems where possible. Large demonstration tables when raised on platforms
can obscure the lower areas of chalkboards.
2) Slope the floor and raise the speaker's platform only where
space is dedicated to projection and large capacity lecture functions.
3)
Consider the viewing distances.
4) Conform to the vertical and horizontal viewing angles.
Place seats at a distance from a screen not less than twice nor more than six
times the width of the screen image to be viewed. The angle of elevation
from the eye to the top edge of the screen or chalkboard should not exceed 30
degrees. Where room or seating depth is known, the screen width can be
determined by W=D/6 (preferred) or W=D/10 (minimum), where W=screen width and
D=depth of room or seating. Select particular projection equipment based on
aspect ratios compatible with height and width ratios for the screen. Refer
to Time-Saver Standards for Building Types, 2nd edition, McGraw-Hill Book
82
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