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|  MIL-S-3644B
4.4.2.3 Static load. A straight length of the casing shall be subjected
to a static load of 125 pounds applied in line with the axis of the casing for
a period of 5 minutes (see 3.5.3).
4.4.2.4 Push-back. The casing shall be stretched to its maximum length
and measured, then compressed to its minimum straight-line length and measured
again (see 3.5.4).
4.4.3 Shafting.
4.4.3.1 Deflection due to torque. A torque of 16 ounce-inches shall be
applied to the shafting first in the winding and then in the unwinding direc-
tion (see 3.6.1).
4.4.3.2 Torque to rotate. With the 8-inch length of shafting inside a 90
degree bend of 4 inch mean radius, the torque required to rotate the shafting
at room ambient temperature and at -55 centigrade, under no load, shall be
determined. The bend shall be made of seamless tubing having an inside diame-
ter of 0.25 inch (see 3.6.2).
4.4.3.3 Torsional strength. A load of 8 1/2 pound inches shall be applied
to a straight section of shafting in both the winding and unwinding directions
for a period of 1 minute in each direction.
NOTE:
Torque required to rotate the shafting in swaged area of aplined
sleeve must exceed torsion strength of shaft.
4.5 Inspection of the preservation, packaging, packing and marking for
shipment and storage. Sample items or packs shall be inspected to determine
the preservation, packaging, packing and marking for shipment and storage
conform to the requirements of section 5.
*
5.
PACKAGING
5.1 Preservation and packaging. . Preservation and packaging shall be
level A or C as specified (see 6.2).
5.1.1 Level A.
5.1.1.1 Cleaning and drying. Tuning shafts shall be cleaned in accordance
with process C-1 and dried in accordance with procedure D1 or D4 of MIL-P-116.
5.1.1.2 Unit protection. The tuning shafts shall be preserved at each end
of the shaft with P2 preservative in accordance with MIL-P-116, method Ic. The
preserved shafts shall then be individually unit packaged in a container con-
forming to PPP-B-636, class domestic. Tuning shafts 72 inches or less in
length shall be placed straight in flat containers with necessary cushioning
to prevent damage. Tuning shafts more than 72 inches in length shall be soiled
on a wood or fiberboard form or core-mounted in the container. The inside
diameter of the coil shall be not less than 24 inches.
Suitable cushion mate-
rial shall be placed in the corners of the container to prevent shifting or
kinking of the shaft in transit.
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