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|  MIL-S-25073A(USAF)
3.4.2.3 Recline adjustment. When the seat is in the normal position, the
back shall be inclined aft at an angle of 13-1/2 degrees from a line per-
pendicular to the plane of the tracks. The back shall be adjustable aft from
the normal position through 20 degrees in increments of 5 degrees. The
design shall permit this adjustment to be made easily while the seat is
carrying a weight of 250 pounds (man plus equipment). Suitable stops shall
be provided at the ends of the adjustment range.
3.4.2.4 Locking mechanisms. The control lever for operating the vertical
adjustment shall be located on the right hand side of the seat pan near
the front. of the pan, and shall be easily accessible to the occupant. The
control for the shoulder harness inertia reel shall be located on the
left hand side of the seat pan approximately 3 inches aft of the front face
of the seat pan. The control for operating the fore-and-aft adjustment
shall be located on the left side of the seat in a position accessible to
the seat occupant with the seat in either the extreme up or down positions.
The control lever for the reclining adjustment shall be accessible to the
pilot on the right hand side of the seat and shall not interfere with the
Other seat adjustment levers. The locking mechanisms shall be released by
an upwardmovement of the levers. The angular movement of the levers shall
not exceed 50 degrees, and the mechanisms shall automatically lock when the
levers are released.
3.4.3 Armrests Armrests shall be provided on each side of the seat at
the approximate location indicated in Figures 2 and 3. The armrests shall
fold into a position where they will not interfere with the egress and
ingress of the occupant when wearing a back-type parachute. The covering
material on the armrests shall be 7-1/4 ounce nylon cloth conforming to
MIL-C-7219, Type III. The top surface of the armrests shall be cushioned
with a 3/4 inch thickness of foam rubber conforming to MIL-R-5001, Type II,
class medium. The color of the covering material shall be maroon red con-
forming to color No. 21136 of FED-STD-595, unless otherwise specified by the
procuring agency.
3.4.4 Headrest. The seat shall incorporate a headrest in the approximate
location shown in Figures 1 and 2. The headrest shall be so designed and
installed as not to interfere with the egress or ingress of the occupant
wearing a back-type parachute. The headrest cushioning material shall be
resilient, durable, comfortable, and shall not pack due to use. The covering
material shall be 7-1/4 ounce nylon cloth conforming to MIL-C-7219, Type III.
The color shall be maroon red conforming to color No. 21136 of FED-STD-595,
unless otherwise specified by the procuring agency.
3.4.5 Shoulder harness reel. The seat shall incorporate a shoulder
harness take up, inertia lock reel in accordance with MIL-R-8236, Type
MA-2 for the Type I seat and Type MA-1 for the Type II seat. The reel
shall be located so that the center line of the shoulder harness attaching
bolt is 20 inches below the top of the shoulder harness roller. It shall
be located so that the cable pulls off the reel in a plane which includes
the longitudinal (fore-and-aft) and vertical centerlines of the seat.
The angle between the mounting plane of the reel and the floor plane of
the seat shall not be less than 75 degrees when the seat back is reclined
at the 13-1/2 degree position.
3.4.6 Shoulder harness roller and guide. A shoulder harness roller and
guide shall be provided on the seat back. The dimensions and location of
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