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6.4.3 Back tangent. The back tangent is established by straight line
in the plane of symmetry of the ejection seat assembly and tangent to the
back of a seated aircrewmember at the thoracic region and buttocks (posterior).
6.4.4 Seated surface tangent. The seated surface tangent is established
by a straight line passing through the SIP, in the plane of symmetry of the
ejection seat assembly and tangent to the bottom of a seated aircrewmember
at the buttocks (ischial tuberosities).
6.4.5 Ejection plane. The ejection plane is defined as a plane parallel
to the ejection seat rails, slippers, or other fixed guide structure that
determines the ejection seat path during its initial upward travel.
6.4.6 Catapult pressure baseline. The catapult pressure baseline is
a theoretical smooth acceleration curve producing equivalent seat velocities
at some selected point in time prior to catapult separation (see 30.3.8.i).
6.5 Changes from previous issue. Asterisks are not used in this revision
to identify changes with respect to the previous issue due to the extensiveness
of the changes.
Preparing activity
Navy - AS
(Project 1680-N510)
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