MIL-P-50307(MU)
Determine that no binding is
( C W) a n d c o u n t e r c l o c k w i s e (C C W) d i r e c t i o n .
evident in the control using normal hand pressure and that the light
The light switch toggle
intensity control knob is secure on its shaft.
when manually operated shall be examined for ease
of manipulation with
positive indexing in both "ON" positions.
4 . 6 . 2 . 2 A r m 1 0 5 4 7 4 7 3 . - Utilize t h e
same test procedure specified in
4.6.5.3 and determine that Arm 10547473 torque measurements do not exceed
the values measured in 4.6.5.3 by more than 10 pound inches at each extreme
temperature in 3.5. Operating and stowed positions shall be as specified on
Observe that Arm 10547473 moves freely between operating and
Figure 1.
stowed positions and determine that the mechanism provided will fasten it
in both positions.
4.6.3
Humidity.- T h i s t e s t s h a l l b e p e r f o r m e d s u b s e q u e n t t o t h e
Except as specified
s e a l i n g test and prior to the
interior atmosphere t e s t .
herein, conduct this test in accordance with the "Test Facilities" and
"Humidity (Procedure 111)" requirements of MIL-F-13926. The projector
shall be exposed for at least 24 hours to a 97% relative humidity (RH) at
an ambient temperature of +160°F. Chamber temperature shall then be lowered
to between+60° and +90°F with condensation and the projector exposed
to this condition for at least four hours - within which time chamber
temperature may be adjusted to obtain other condensation periods. The
humidity phase of this test shall now cease and the external surface of
t h e projector shall be dried by wiping all a c c e s s i b l e
areas - do not dry by
air blast or oven. Protect electrical pins, not normally exposed, from humidity.
4.6.4 Vibration.- Prior to vibration, perform test 4.6.6.1, determine
compliance with 3.7.2, and record the optical-mechanical alignment demon-
strated by the projector.
Vibration shall be under the test conditions in
the "Test Facilities" requirement of MIL-F-13926, utilizing test equipment
c o n f o r m i n g t o 4 . 5 a n d w i t h 2 8 v d c a p p l i e d to
the projector's electrical
input - in proper polarity. Throughout vibration, the projector shall be
under constant surveillance to detect any evidence of optical, mechanical,
or electrical component failure or malfunction.
Except during dwells in
4 . 6 . 4 . 1$ e l e c t r i c a l c i r c u i t s s h a l l b e m o n i t o r e d t o v e r i f y t h a t n o i n p u t
current change occurs - indicative of intermittent electrical connection,
e l e c t r i c a l s h o r t c i r c u i t , o r c o m p o n e n t m a l f u n c t i o n i n e i t h e r "ON" position
of the filament selector switch. The constant current drawn by each
filament of the dual filament lamp - or between lamps - need not be of
identical value.
Subsequent to vibration, the projector shall be examined
for evidence of damage and again subjected to test 4.6.6.1 to determine
compliance with 3.7.1.
4.6.4.1 Vibratian A . - Perform this test in compliance with require-
ments of 3.7.1 and 3.7.1.1 and in accordance with procedure I (Parts 1, 2 and
3) of MIL-STD-81O and the
specific procedure herein and in 4.6.4. During
t h i s t e s t , set the light intensity control for maximum reticle lamp
illumination.
The filament selector switch shall be positioned in an al-
t e r n a t e "ON"
position, each time Arm 10547473 is relocated during each
During the first hour of each two hour
first hour vibration in each plane.
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