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|  MIL-S-27174B(USAF)
3.5.3.2 Seat panels. Adjacent seat bottoms shall be attached by a slide
fastener conforming to the requirements of V-F-106, type IV, size MH, style 7,
class A. The joint shall not sag but provide a continuous seat bottom.
Seats shall be easily joined and unjoined when the seat bottoms have varying
adjusted cloth tensions in relation to each other.
3.5.3.3 Back support. The tape (webbing) material used for the seat
back and seat back adjustment straps shall be 1-1/4 inches in width, conform-
ing to MIL-W-4088, type III. The tapes shall be equally spaced as shown in
Figures 5 and 6 and shall be sewed together at the points where they cross
or intersect. Snap fasteners conforming to MS27983-1N and MS27983-2N shall
be installed in accordance with Figures 5 and 6. The lower part of the back
support shall be nylon cloth, conforming to MIL-C-7219, Type III. The seat
back shall be adjustable and shall be quickly detachable from the upper seat
support tube.
3.5.3.4 Back support length. The back support, in addition to having
material to provide for an adjustment of 36-40 inches, shall have enough
material to allow the back support to lay against the seat bottom. Snap
fasteners conforming to the requirements of MS27983-1N shall be spaced as
shown in Figures 3 and 4 to provide the maximum seating space for para-
troopers carrying full equipment.
3.5.4 Front support tube. Each seat shall be so designed that the front
support tube, seat bottom and seat back may be joined to the corresponding
parts of an adjacent seat in any combination on either the left side or
right side of the aircraft. The front support tube shall be easily and
quickly connected to or disconnected from the adjoining seat. The mechanism
should have a mimimum number of parts as practicable and shall not require
lubrication. The mechanism shall lock positively and shall be provided with a
positive lock for stowing the interlocking portion of the mechanism when not
in use. Any two installed adjoining seats shall have a clearance between
butting front support tubes not exceeding 1/16 inch. The mating parts shall
conform with the dimensions of Figure 7.
3.5.5 Independent release. It shall be possible to release the legs and
front support tubes of adjoining and joined seats in any combination or
number and stow them without disturbing the remaining seats.
3.6 Construction.
3.6.1 Methods. Riveting or welding may be used for assembly of component
parts fabricated of metals suitable for this type of construction. Fittings
and joints, which require disassembly of the component parts of the seat,
shall be bolted. All thread and stitches used for sewing seat back and seat
bottom shall be in accordance with V-T-295 and FED-STD-751, type 301,
respectively.
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