Backbone. Head and tail left on. Trim, split, and covered with.

Dy STAR TRACKER DOORS (2) CREW TRANSFER T UNNEL KIT (NOT ON STS-1) | ~ 1 SIDE) "ai - | dy STAR TRACKER DOORS (2) CREW INGRESS/ EGRESS SIDE HATCH EGRESS BAR BAR IS 3.2 m (10.5 FT} FROM GROUND WHEN ORBITER RESTS.