MIL-S-6551A(USAF)
3.2.8 Shoulder harness reel. The seat shall incorporate the shoulder harness take-up inertia lock reel, conforming to Specification MIL-R-8236, installed in accordance with Drawing No 46Dl28 as shown in Figure 4. The reel shall be located on the stationary part of the seat, as is the shoulder harness support, when the seat bucket is adjustable with respect to the bucket support structure. In addition to the quadrant control shown on
Drawing 46Dl28, the inertia lock reel s�.:i_!-_l control is operated.
3.2.9 Shoulder harness support structure.
�e_.!_o,���g _Fh�I). the emergency
3.2.9.1 Seat bucket adjustable with respect to bucket support structure. The shoulder harness support shall be a part of the stationary seat structure and shall be located 30 inches above the seat reference point when the seat is adjusted to the down or lowest position.
3.2.9.2 Seat bucket stationary with respect to bucket support structure. The shoulder harness support shall be located 27 inches above the seat reference point.
3.2.10 Upholstery. The seat shall be padded on the head rest. The permaD
nent padding shall be of a high energy absorbing material approved by the
Procuring Agency. Padding |
thickness shall be a minimum of 1/2 inch. |
The |
color shall be maroon red, |
color No 21136 of Federal Standard 595. |
3.2.11 Head rest.
3.2.11.1 The front face of the head rest shall be parallel to a reference plane which passes through the front surface of the oxygen pack. The top of the head rest shall be located 39 inches from the seat reference point
measured parallel to the seat back when the seat is in the bottom or lowest position. To avoid interference with the parachute, the underside of the head rest shall be faired in as shown in Figure 1.
3.2.11.2 Type H-1 seat. When the seat is bottomed prior to ejection, the front surface of the head rest shall be located one inch to the rear of the reference plane with the seat in the bottom position. If the seat is ejectable from any position, the front surface of the head rest shall be located one inch to the rear of the reference plane in all positions of adjustment.
3.2.11.3 Type H-2 seat. The front surface of the head rest shall be located in the reference plane.
3.2.12 Foot rests. Foot rests shall be provided at the front of the seat pan (see Figure 1). They shall be of the type which remain at the level of and are parallel to the floor as the seat is adjusted. The foot rests shall have retainers which shall be so designed that they will laterally restrain the occupant's feet and prevent them from moving upward during downward ejection, regardless of whether the occupant is wearing cold weather flying boots or standard shoes. The method of accomplishing this vertical
restraint shall be such that the occupant's feet shall be automatically released after ejection. The foot rests shall not have any sharp edges.
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