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MIL-S-8551O(AS)
4.6.5.1 Webbing tests.  All webbing shall be tested in accordance with MIL-W-
25361 to show compliance with table II.
4.6.5.2 Hardware tests.
All restraint system hardware shall be tested as fol-
lows:
a.
Buckle release tests. The shoulder straps and lap belts shall be
connected to the buckle around a static body block in the correct
position for normal use.  The body block shall be loaded such that
each tensile load condition specified below exists in each re-
spective component.
Condition A
Condition B
Component
Load
Load
Lap belt
100 10 pounds
1 pound
Shoulder
100 10 pounds
1 pound
harness
The buckle shall then be opened and the force required to activate
the release mechanism shall be measured.  This sequence shall be
repeated 50 times for each condition.  For the rotary buckle, the
rotation necessary to release the straps shall be 30 to 45
degrees from the starting position. The torque necessary to
operate the release mechanism for each condition shall be 15 to
75 inch-pounds and the force required for the lift latch type
shall be between 5 to 10 pounds. The release arc for the lift
latch shall be no greater than 90.
b.
Buckle fitting release test. Mount buckle on a fixture with
all fittings fully engaged and no load (including that which might
be applied by the weight of the webbing) applied to them. Manually
actuate the buckle's release mechanism and visually inspect that
all fittings were released from the buckle's late-hing mechanism.
Then release the mechanism.  The straps should be able to be
pulled free from the buckle.  This sequence shall be repeated 50
times.
Inertia reel test.  If applicable, the inertia reel shall be
c.
tested in accordance with MIL-R-8236, if not a Qualified
Products List (QPL) item.  When specified by the acquiring
activity to meet specific mission requirements, the inertia
reel shall be tested in accordance with MIL-R-8236, if not
a Qualified Products List (QPL) item.
d.
Lap belt assembly test.  The lap belt shall be tested as an
assembly.  The lap belt anchors (end fittings) shall be at-
tached to fixtures (one fixed and one movable) and webbing
lengths adjusted to fit a 95th-percentile occupant. The test
shall be started from an initial preload of 100 pounds. The
fixtures shall be separated at a rate of 2 in./min. The
elongation and applied load shall be measured continuously
or at intervals not to exceed 0.5 inch of elongatin. If load-
18

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