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MIL-S-60828A(MU)
3.7.14.  Actual values of direct force required for each examination shall
be determined by the formula:
Torque value in 3.7,14 (Pound inches)
Direct Force Applied
Arm Length Upon Which Force Acts (Inches)
(pounds)
Arm length upon which force acts shall be measured along Arm 10547473 toward
the beamsplitter from an axis through the center of the bore in the yoke
casting supporting Arm 19547473.  Place Arm 10547473 in an operating posi-
tion with the force gage (see 4.5.2.4) inserted - weighted end down - between
the stop surfaces.  Use a spring scale and apply sufficient force to cause
the gage to fall clear.  The measured value of slowly applied force that
moves Arm 10547473 a distance in excess of 0.002 inch, which allows the
gage to fall clear, shall be used to verify compliance with the applicable
requirement in 3.7.14.  Now use the spring scale and measure the force
required to freely move Arm 10547473 from (not out of) its operating posi-
tion to its stowed position and verify compliance with the applicable
requirement in 3.7.14.  Arm 10547473 shall then be placed in a stowed
position.  Again use the spring scale and measure the force required to
cause the restraining linkage to fold permitting Arm 10547473 to move
freely toward its operating position.
4.6.4.18 Range knob torque.- To perform this test, utilize a standard
torque wrench with appropriate adapter.  The range knob shall be rotated
throughout the ranges in Column 1 of Table I in both cw and ccw directions.
Observe that torque readings remain within the limits specified in 3.7.15,
each time the knob is moved out of detent in both a cw and ccw direction.
.
NOTE: It is necessary to depress the detent plunger 10547323 to change
"
from one scale to the other.
`
4.6.4.19 Sealing .- This test shall be performed prior to the humidity
test 4.6.3 - when a humidity test is required (see 4.4) - utilizing test
equipment conforming to 4.5.  Housing 10547482 shall be internally
pressurized with dry nitrogen gas to the pounds-per-square-inch gage
pressure (psig) in 3.7.16 for not less than two hours.  Throughout this
period, no pressure drop greater than the limit specified in 3.7.16 shall
be evident.  Upon completion of this test, flush the housing with dry
nitrogen gas through a regulator to prevent excessive internal pressure
during flushing.  Utilize a dew point tester and continue flushing until
the gas bled from the housing exhibits a dew point at least as low as -25F
with an internal pressure of between 0.10 and 0.25 psig. Housing 10547482
shall then be sealed.
q
4.6.4.20 Interior atmosphere.- This test shall utilize the procedure
in 4.6.4.19 except that the examination previously performed to detect ex-
cessive loss of pressure need not be repeated.  This examination shall
.
17

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