A seat pan adjustment system for an ejection seat, comprising: a guide bracket defining a channel ; a seat pan mount configured to translate relative to the guide bracket; a support bracket extending from a surface of the seat pan mount; a rod located through a rod opening defined by the support bracket, wherein the rod is located in the channel; and a biasing member coupled to the rod and configured to force the rod away from the surface of the seat pan mount; wherein the channel includes: a lower rod recess ; an upper rod recess ; a first vertical chamber generally parallel to the surface of the seat pan mount; a horizontal chamber extending from the lower rod recess to the first vertical chamber and generally perpendicular to the surface of the seat pan mount; and a second vertical chamber located between the lower rod recess and the upper rod recess and generally parallel to the surface of the seat pan mount, wherein the first vertical chamber is located closer to the surface of the seat pan mount as compared to the second vertical chamber; and wherein the guide bracket further includes a backdraft damper located between at least one of the lower rod recess and the horizontal chamber, the upper rod recess and the second vertical chamber, or the upper rod recess and an upper interference surface located at an end of the second vertical chamber opposite the lower rod recess. a guide bracket defining a channel ; a seat pan mount configured to translate relative to the guide bracket; a support bracket extending from a surface of the seat pan mount; a rod located through a rod opening defined by the support bracket, wherein the rod is located in the channel; and a biasing member coupled to the rod and configured to force the rod away from the surface of the seat pan mount; wherein the channel includes: a lower rod recess ; an upper rod recess ; a first vertical chamber generally parallel to the surface of the seat pan mount; a horizontal chamber extending from the lower rod recess to the first vertical chamber and generally perpendicular to the surface of the seat pan mount; and a second vertical chamber located between the lower rod recess and the upper rod recess and generally parallel to the surface of the seat pan mount, wherein the first vertical chamber is located closer to the surface of the seat pan mount as compared to the second vertical chamber; and wherein the guide bracket further includes a backdraft damper located between at least one of the lower rod recess and the horizontal chamber, the upper rod recess and the second vertical chamber, or the upper rod recess and an upper interference surface located at an end of the second vertical chamber opposite the lower rod recess. a lower rod recess ; an upper rod recess ; a first vertical chamber generally parallel to the surface of the seat pan mount; a horizontal chamber extending from the lower rod recess to the first vertical chamber and generally perpendicular to the surface of the seat pan mount; and a second vertical chamber located between the lower rod recess and the upper rod recess and generally parallel to the surface of the seat pan mount, wherein the first vertical chamber is located closer to the surface of the seat pan mount as compared to the second vertical chamber; and wherein the guide bracket further includes a backdraft damper located between at least one of the lower rod recess and the horizontal chamber, the upper rod recess and the second vertical chamber, or the upper rod recess and an upper interference surface located at an end of the second vertical chamber opposite the lower rod recess. <EOS>