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Model 400-X Feedback Control Loader System

The Model 400-X Feedback Control Loader System is a versatile apparatus that can be adapted for a variety of training simulation equipment such as steering wheels, throttles, collectives, seat shakers, and tillers. It uses minimal to zero-backlash gearboxes in various configurations with DC brush-type motors, which eliminates friction and inertia in the flight controls.

The system meets FAA Level D of certification from the JAA, FAA, and military equivalents for rotary and fixed-wing aircraft. The unique coupled-mass servo force-loop technology provides the technical foundation for all their systems, combined with highly responsive electric actuators and sophisticated math software models that provide the highest fidelity control loading anywhere.

The aircraft control model is based on a real aircraft data model and can simulate any type of control system: fully boosted, partially boosted, or non-boosted. The system's spring rate and damping can be varied to simulate the change in the force gradient and damping present with the change in dynamic pressure.

Friction, stops, breakouts, boost actuators, non-linear gearing, non-linear hinge moments, and auto-pilots (simulated and real) are available with this system. The controls can be linked via software, and separate actuators can be utilized for aircraft that have separate left and right controls.

The 400-X Feedback Control Loader System can be used with their 300-X Feedback Control Loader System and full Motion Base Platform product line, creating a comprehensive and cohesive system for simulation training.

All systems come with a full one-year warranty and lifetime email/phone technical support. Extended warranties are also available.

For information on our software packages for this system, please click here.
For information on our integration and installation support, please click here.

Standard Specifications for 400-X Systems include:

Force at Pushrod is 1000 Lbs max, 500 Lbs continuous (other available)
Velocity at Pushrod is 25in/sec
Actuator Stroke is 5in max, 4in usable
Actuator Bandwidth is 100Hz or greater

Iteration Rate is 4000Hz or better
Latency (Ethernet) is less that 1ms
Analog to Digital Converter is 16-bit high speed
Digital to Analog Converter is 16-bit high speed

Reliability. Proven.

System Failure is not an option for us... with a MTBF of decades and virtual no maintenance. HFCL-X was made to last.

Customized Systems

With several models and designs to choose from, we work with you to get the job done... from design, manufacture and installation.


Always at your fingertips... Need your team trained... we do that too.

Model 400-x Actuator - Other configurations available.

model 400-x actuator

Flight Control Model:

Coupled mass system. Model includes cable spring, coupled mass, friction, damping, aero hinge moment, aero damping, boost actuators, non-linear gearing, breakout, centering spring, for and aft stops (fixed or movable), trim, autopilot engage, weight on nose wheel, nose wheel velocity and nose wheel velocity angle.

Control Parameters from Host:

Dynamic pressure, roll rate, pitch rate, yaw rate, dynamic pressure divided by velocity, boost oil pressure, autopilot command, autopilot engage, weight on nose wheel, nose wheel velocity and nose wheel angle.

Variables to Host:

Stick positions, Pedal position, Surface positions, control forces, nose wheel angle, nose wheel force, error code. Others available upon request.


Several interfaces are available: Bit 3, Ethernet, DR-11W (Concurrent), HSD (Encore), and UBC (Universal Bus Controller, Harris). Bit 3 is the easiest to use, Ethernet is the lowest cost for hardware. RS-232 can be used but is usually too slow. DR-11W, HSD, and UBC are essentially obsolete and should only be used with older host computers.

Power Requirements:

115 (230) volts, 7 (3.5) amps peak per axis
115 (230) volts, 1 (0.5) amps quiescent per axis
115 (230) volts, 3 (1.5) amps for the processor

Fixed Wing Aircraft Experience

Embraer EMB-120

Beechcraft King Air

Boeing 737 Loft

Boeing 737 JTS


Cessna T-37

Cessna T-38 Talon

Beechcraft King Air C-90

Beechcraft Baron

Northrop F-5 Tiger

Piper Cheyenne Pa-42

Boeing C-17 Globemaster

Lockheed C-141 Starlifter

Cessna 421

Beechcraft Super King Air B200

Douglas A-1 Skyraider

Boeing B-52 Stratofortress


Beechcraft T-34 Mentor

McDonnell Douglas AV-8B Harrier II

Bombardier CL-415 Water Bomber

McDonnell Douglas DC-9


Cessna Ironbird Jet

Bombardier CRJ (Canadian Regional Jet)

McDonnell Douglas F-15 Eagle

Dornier 328

Northrop Grumman EA-6B Prowler

Beechcraft C-12 Huron

Lockheed C-130 Hercules

Lockheed F117 Nighthawk

Boeing KC-135 Stratotanker

Rotary Wing - Helicopter Experience

Robinson R-44

Airbus HH-65 Dolphin

Sikorsky MH-60 / SH-60 Seahawk

Bell B212

Bell UH-1N Twin Huey

Boeing AH-64 Apache

Boeing AH-64 Apache Longbow

Sikorsky MH-53 Pave Low

Boeing CH-47 Chinook

Control System Modeling

Multi-Mass Modeling
Aircraft Measurement
Aircraft Dynamic Curves
Verification and Validation

Terrain and Nautical Applications

Steering Wheels
Joystick Controls

Rotary Wing System Applications

Collective Lever
Cyclic Stick
Directional Pedals

Fixed-Wing Systems Applications - FAA Level D

Flight Stick, Wheel & Column
Rudder Pedals
Throttle Controls
Trim and Tillers