MIL-S-655 lA(USAF)
3.2.2 Ejection position. The seat may be ejected from any adjusted position. However, the seat shall be bottomed prior to ejection if adequate cockpit and/or hatch clearances are not obtainable for any adjusted
position. If the seat is to be bottomed prior to ejection, the emergency control shall be interconnected with the seat adjustment control mechanism so as to cause the seat to automatically move to its lowest and most aft position for ejection. The force tending to move the seat to its lowest position shall have a vertical component equal to three (3) times the sum of the weight of the occupant and his equipment plus the weight of the movable portion of the seat. The time required to move the seat the full adjustment shall be not more than one second. The means provided shall
not cause any undesirable jolt to be imposed on the occupant.
3.2.3 Parachute and oxygen pack. The seat back shall provide space for the back-type parachute and oxygen pack. The space requirement for this parachute and oxygen pack is specified in Figure 6.
3.2.3.1 Parachute support. A shelf or ledge shall be provided in the rear bottom portion of the s-at located on a line through the reference point perpendicular to the seat back and so designed that no matter what the height adjustment of the seat, the full weight of the parachute as worn by the occupant will be borne by the ledge or shelf, and the harness of the parachute shall be slack at the shoulder of the wearer. This shelf, or ledge, shall not touch any portion of the body of the user nor interfere
in any way with the comfort characteristics of the seat. The top forward edge shall be beveled as shown in Figure 5.
3.2.4 Survival kit. The seat bottom shall provide space for a survival kit. The space requirement for the survival kit is specified in Figure 6. The 17-inch dimension shall be placed transversely in the seat pan. It is intended that the survival kit be placed in the pan so that it extends from the front of the pan to the reference plane.
3.2.S Disconnect. Provision shall be made for the attachment of an emergency disconnect fitting for personal leads on the left side of the seat. This disconnect will provide for the automatic separation of the
crew members' personal leads upon ejection. The contractor shall fabricate the disconnect in accordance with applicable drawings and specifications
to be provided by the Procuring Agency.
3.2.6 Safety belt. Provisions shall be made for use of the Type B-18 safety belt, conforming to drawing No 51H3977. The belt shall be attached with a 1/4 inch diameter bolt which shall be placed in double shear. The point of attachment to the seat shall be so located that when the belt is inclined upward and forward with the plane of the belt at an angle of 40° to the plane of the seat bottom, the center line of the belt shall pass through the reference point.
3.2.6.1 Tiedown strap. Provisions shall be made for the use of the tiedown strap conforming to Drawing No 52F6624.
3.2.7 Shoulder harness. Provisions shall be made for the use of the G-3 shoulder harness conforming to Drawing No 50D3772.
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