28
FLIGHT CONTROLS
C-1300 Control Yoke and Trim Controls
Flap Controls
The C-130 has convention flight control surfaces consisting of elevator, ailerons, and a single
rudder. Trim is provided in all three axes by electrically powered surface trim tabs. The elevator,
ailerons, and rudder are “boosted” by independent hydraulic booster packs, two for each control
surface, each powered independent hydraulic systems. The control boost arrangement uses a
“weighting arm” to divide the control surface aerodynamic hinge moment between the pilot and
the hydraulic cylinders. The flight control system is reversible, as the control surfaces are
mechanically connected to the rudder pedals and yoke, and the control forces felt by the pilot are
provided by the aerodynamic loads on the control surface. Retaining some aerodynamic hinge
moment for the pilot to work against provides the feel of an unaugmented aircraft (higher forces
at higher airspeeds, and buffet through the flight controls), and eliminates the need for an
artificial feel system, as well as allowing for manual reversion in the event of a dual hydraulic
system failure, albeit with vastly increased control forces. This was state-of-the art flight control