Track Button Removal
1. Turn the latch capscrew of each button
counterclockwise until the latches are aligned
with the buttons. The button can then be lifted
out of the slot with the speed wrench.
Perform a count of the buttons to ensure they
have all been removed.
Return the buttons to their storage cart and
return the cart to their designated storage area.
Any missing or damaged button shall be
reported to the catapult officer.
After the catapult slot has been cleared of
buttons, stow the shuttle forward.
Cylinder Expansion Indicator
The cylinder expansion indicators (fig. 4-33)
provide a flight deck visual indication of cylinder
thermal expansion. There are two expansion indicators,
each connected to the forward end of each launching
engine cylinder. The indicator support is fastened to the
cylinder cover inner male guide, and supports the
pointer assembly. The pointers normally extend
through slots in the deck, but are spring loaded to
prevent damage during deck access cover removal.
Recessed in the deck beside each deck slot is a scale
with 0.10-inch graduations. The expansion indicators
move with the cylinders, and expansion can be
measured directly by reading the scale beside the
1. Inner male guide
5. Pointer assembly
7. 9-foot Cylinder
Figure 4-33.Expansion indicator.