Specifications

MIL-STD- 1472E
5.11.3.17 Li~hting. Means shall be provided for illumination of internal and external scales,
level vials, and other instruments that must be read under low light Jevel conditions. Continuously
variable control of illumination shall be provided as required by weapon system characteristics.
Illumination to be used under low light level conditions shall minimally affect the dark adaptation of the
observer. Red illumination or red filters should be used to maintain dark adaptation.
5.11.3.18 Maintenance.
5.11 .3.18.1 Modular desire. When practical, optical equipment should configured as modules
to provide for interchangeability of optical subassemblies,
5.11 .3.18.2 Positioning aids. Built-in aligning devices and other aids should be used wherever
possible for ease of positioning optical assemblies within an instrument or optical modules that have
multiple applications in equipment.
5.11.3 .18.3 Ou
ick release. Where practical, quick-release methods of removing optical
instruments should be used.
5.11 .3.18.4 Collimation. Optical instruments should be provided with built-in collimation
features to allow field adjustment.
5.11 .3.18.5 Purgin~ and chaining.
Where periodic purging and charging of optical instruments
are required, an instruction plate, indicating time interval and pressure requirements shall be provided
on the instrument. Purging and charging fittings shall be accessible for required maintenance.
5.11.3 .18.6 CornPO
nent nmlacement. Internal components such as Lightbulbs that requhe
frequent replacement, checkout, or maintenance should be easily auxssible, removable without special
tools, and qhceable without removid or disassembly or other comjx)nents. Components that require
frequent replacement and frequently used special tools and equipment shall be readily accessible.
Provision should be made for stonage of such components and tools in or on the specific equipment.
This particularly applies to items such as light bulbs whose failure could make the instrument
inopembk.
5.11.3 .18.7 Bomsighting.
5.11 .3.18.7.1 Positive locks. Boresight knobs shall be provided with a positive lock. (The
boresighting settings shall not change during the locking process.)
5.11 .3.18.7.2 Lock-unlock resistance. Boresight knob locks shaIl require not greater than 45 N
(10 lb) of force to lock and unlwk.
5.11 .3.18.7.3 Adjustment omxation. Boresight adjustment knobs should be capable of being
locked, unlocked, and adjusted by suitably clothed and equipped users with hand dimensions varying
between the 5th and 95th percentiles.
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