MIL-S-58095A (AV)
3.11.7 Occupant restraint. The occupant restraint subsystem shall conform to
Figure 2. The restraint harness shall be comfortable, light in weight, and
easy for the occupant to put on and take off even in the dark. The restraint
harness shall provide freedom of movement. to operate the aircraft controls.
Restraint webbing shall conform to MIL-W-25361 to the extent that other
characteristics are not specified herein. The restraint shall be attached to
the stroking portion of the seat such that relative position to the occupant
will be maintained.
3.11.7.1 Lap belt. The lap belt anchorage geometry shall be as shown on Figure
3. The lap belt end attachments shall be capable of rotating plus and minus 20
degrees (0.350 radians) vertically from design inclination. An adjustor shall
be provided in each strap.
3.11.7.2 Lap belt tiedown strap. The lap belt tiedown strap anchorage point
shall be located on the seat pan centerline between 14 to 15 inches (35 to 38 cm)
forward of the seat reference point. The buckle shall be affixed to the belt
tiedown strap. An adjustor shall be provided. The maximum webbing extension
allowed by the adjustor shall be limited to that required to fit a 95th percen-
tile aviator.
3.11.7.3 Shoulder straps. Shoulder harness anchorage geometry shall be as
shown on Figure 3. The guide at the top of the seat shall not be more that 0.5
inch (13 mm) wider than the strap passing through it. Edges and corners of the
guide in contact with webbing shall be smooth and rounded to a radius no less
than 0.25 inch (6mm) to minimize fraying. Motion through the webbing guide shall
not be impaired by shoulder strap design.
3.11.7.4 Restraint system construction. Stitch pattern and cord size shall con-
form to Figure 4. The strap wrap radius at buckles, anchorages, and adjustments
shall be not less than 0.062 inch (1.6mm) as shown on Figure 4. All surfaces in
contact with moving straps shall have a miximum surface roughness of 32 RMS to
prevent fraying.
3.11.7.5 Inertia reels. Both shoulder straps shall be served by a single
inertia reel conforming to type MA-6 of MIL-R-8236, except that the ultimate
strength of the inertia reel assembly shall be 5000 pounds (22,250 newtons)
-
minimum while statically loading the lead-in webbing- The reel shall be located.
as close to the shoulder strap guide as possible.
3.11.7.6 Buckle. The buckle shall be a five point quick release type
permanently attached to the tie-down strap and operable with gloves. The only
action required to secure the restraint system shall be insertion of the metal
end fittings into the buckle. The buckle shall be equipped with a pad to
provide a soft interface that distributes loads to the occupant. The buckle and
pad shall not exceed a total thickness of 1.75 inches (45 mm). Vibration,
decelerative loading or contact with occupant or aircraft controls shall not
inadvertently open the buckle. The intentional release of the restraint harness
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