MIL-S-6551A(USAF)
3.1.1 Standard parts. AN standard parts and AN standard part numbers therefor shall be used wherever they are suitable for the purpose.
Commercial utility parts such as screws, bolts, nuts, washers, cotter pins, fluid fittings, etc, may be used provided they are replaceable by AN standard parts without alteration, and provided the corresponding AN part numbers are referenced on the drawings and in the parts lists. In applicaD tions for which no suitable corresponding AN part is in effect on date of invitation for bids, commercial parts may be used provided they conform to all requirements of this specification.
3.1.2 Protective treatment. When materials are used in the construction of the seat that are subject to corrosion in salt air or other atmospheric conditions likely to occur during service usage, they shall be protected against such corrosion in a manner that will in no way prevent compliance with the performance requirements of this specification. The use of any protective coating that will crack, chip or scale with age or extremes of atmospheric conditions shall be avoided.
* 3.1.3 Reclaimed materials. The use of reclaimed materials shall be encouraged to the maximum extent possible.
3.2 Design. The crew ejection seat shall be designed to the general configD
uration of Figures 1, 2, 3, 4, 5, 6, and 7.
3.2.1 Seat adjustment.
3.2.1.1 Vertical and fore-and-aft adjustment. The type H-1 seat shall be provided with a combined vertical and fore-and-aft adjustment as shown in Figure 7. The seat shall be provided with either a loading mechanism or a positive action mechanism (such as a jack) for accomplishing the adjustment. If provided with a loading mechanism, the force on the seat produced by the
mechanism shall not exceed 150 pounds when the seat is in the lowest position
and shall not be less than 35 pounds when at the highest position. Rubber shock cords shall not be used for this purpose. Where a loading mechanism is used, adjustment should be provided in increments of from 1/2 to 3/4 inch.
3.2.1.2 Vertical adjustment. The type be in accordance with paragraph 3.2.1.1 with a 4 inch vertical adjustment only. parallel to the ejection angle.
H-2 seat adjustment requirements shall except that the seat shall be provided This adjustment may be along a line
3.2.l.3 Locking mechanism. The lever for operating the seat adjustment shall be located on the right hand side of the seat as shown in Figure 1. The locking system shall be designed to lock the seat in the adjusted position
and retain it under the full ejection load. The lever and locking system
shall be designed in such a way that the lever cannot be moved into the locked position unless the seat is positively locked.
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