The tunnel controls are a series of connecting links,
idlers, and control arms mounted on top of the cabin
section. The tunnel controls transmit second stage
control motions aft to the aft flight controls.
Connecting links with 26 have a special coating that
increases their resistance to heat and fire.
The aft controls are in the pylon. Connecting links
and bellcranks transmit tunnel control motions to
control valves located in two dual servocylinders. The
servocylinders are connected to the structure and
the controllable swashplate. An LCT actuator, yoke
and forward fixed link are part of the aft flight controls
and are located on the forward side and below the aft
swashplate. The LCT actuator is controlled by manually
applied electrical inputs from the cockpit or by the AFCS.
Bellcranks and connecting links with 26 have a special
coating that increases their resistance to heat and fire.
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