MIL-B-21518A (Wep)
Operating Life and Flexure - The flexible-
3.3.2
bellows assembly shall withstand 150 cycles of axial flexure
and 150 cycles of lateral flexure at the rate of one cycle-
In axial flexure, the free end of the bellows
per-minute.
is moved through an elliptical path having axes. of 8 and
12 inches, with the plane of motion and the minor axis per-
pendicular to the mounting ring. In lateral flexure, the
free end of the bellows is moved through an elliptical path
having axes of 8 and 12 inches, with the,Plane of motion
parallel to and 9 inches from the mounting ring.
flexing, the bellows shall show no damage and shall meet
all performance requirements and product characteristics
of this specification.
Deflection - The flexible-bellows assembly, in
3.3.3
a horizontal position and with the ends fixed axially 9 inches
apart, shall not deflect to the extent of obstructing the
4-1/2 inch diameter clear line of sight.
Environmental
Conditions
3.4
Temperature and Humidity
3.4.1
3.4.1.1
Normal
Temperature
-
The
flexible-bellow
assembly shall be capable of withstanding continuous
sure to air temperature of +8o ± 3 degrees Fahrenheit with
a relative humidity of 5O percent or less for 90 days, shall
show no damage, and thereafter shall meet all performance
requirements and product characteristics of this specifica-
tion.
Low Temperature - The flexible-bellows assembly
3.4.1.2
shall withstand temperature of +28 ± 4 degrees Fahrenheit
for 4 hours, shall show no damage, and thereafter shall meet
all performance requirements and product characteristics of
this specification.
High Temperature - The flexible-bellows assem-
3.4.1.3
bly shall withstand temperature of +110 ± 4 degrees Fahren-
heit, with a relative humidity between 95 and 98 percent,
for 12 hours, shall show no damage, and thereafter shall
meet all performance requirements and product characteristics
of this specification.
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