Futaba GYA573 6-Axis Flight Control System

Product Overview

The Futaba GYA573 is a compact and lightweight 6-axis flight control system designed for RC airplanes. It provides control for ailerons (roll axis), elevators (pitch axis), and rudders (yaw axis). The GYA573 features a recovery mode to avoid danger, simple setup, and S.BUS2 connectivity. It supports remote gain and four flight modes: Auto Recovery, Normal, AVCS, and Gyro OFF.

Key features include support for various airplane configurations such as 4 ailerons, 2 elevators, 2 rudders, flying wings, gasoline planes, and EP planes. It is compatible with FASSTest 26CH and supports 4D flight, roll flat, air brake mixing, and camber mixing.

Note: Gyro control is not possible if the aircraft stalls. The fail-safe function of the transmitter should not be set to the channel used by the gyro. The GYA573 requires a Futaba transmitter system of 10 channels or more and an S.BUS2 receiver.

GYA573 Ratings

• Gyro sensor: MEMS vibrating structure gyro
• Operating voltage: DC 3.8 V to 8.4 V
• Current drain: 27 mA (excluding servo)
• Operating temperature range: -10°C to +45°C
• Dimensions: 28 x 26 x 16 mm (1.10 x 1.02 x 0.63 in)
• Weight: 8.5 g (0.30 oz)

Set Contents

• GYA573 x 1
• Double-sided tape x 2
• Receiver connection cable x 1
• Manual x1

Precautions

• Ensure sufficient transmitter battery capacity for flight.
• Determine operating time for receiver, gyro, and servo batteries and allow a margin.
• Analog servos cannot be used in "digital servo" mode. Using analog servos in digital mode may cause damage.
• Do not strike or drop the gyro.
• Do not use trims or mixing in AVCS mode.
• The GYA573 is designed for RC airplanes only.
• Avoid placing the gyro near heating equipment (engine, motor, ESC, battery, servo, etc.). Allow the gyro to adjust to ambient temperature before flight.
• Ensure correct connector orientation to prevent short circuits.

Installation and Connections

Servo Connection: Link servos according to the kit manual. Adjust linkage rods for minimal trim. For dual servos, ensure correct operating direction (aileron: same direction, elevator: opposite direction).

Digital/Analog Servo Selection: Set servo type in parameter settings. Use 'DG: 285 Hz' for digital servos and 'AN: 70 Hz' for analog servos. Using analog servos in digital mode can cause damage.

ELEVON/V-TAIL Connection: Set the wing type in the GYA573. Turn off elevon/V-tail mixing on the transmitter. Use gyro neutral offset for adjustments, not transmitter sub-trim.

S.BUS2 Connection: Connect to the S.BUS2 port of the receiver using the provided cable. Telemetry sensors should be connected to the receiver's S.BUS2 port, not the GYA573.

Mounting: Firmly attach the gyro to a level area near the center of gravity using the supplied double-sided tape. Avoid areas with high vibration. The gyro mount direction can be adjusted if installed on the side or rear of the fuselage.

Gyro Sensitivity and AVCS Switching

The GYA573 offers two operation modes: NORMAL (rate control) and AVCS (angle control with stronger neutral keeping). AVCS mode helps maintain flight attitude and compensates for aircraft idiosyncrasies. It is recommended to switch to NORMAL mode for takeoff and landing.

Remote Gain Function: AVCS mode is selected at the '+' rate side and NORMAL mode at the '-' rate side of the transmitter's remote gain channel. Sensitivity is adjusted via endpoint settings. For AVCS, using a 3-position switch for sensitivity is recommended.

Sensitivity Adjustment: Sensitivity is zero between -50% and +50% endpoint rate, and 100% at +130%. Refer to the transmitter manual for endpoint settings.

GYA573 Startup and Operation

Initialization: Upon power-on, the GYA573 initializes and reads neutral positions (especially in AVCS mode). Successful initialization is indicated by two repetitive servo movements. Always check gyro operation direction.

Startup Time: Allow 6-7 seconds after power-on for accurate attitude grasping. Keep the aircraft horizontal (within 30° tilt) during this period. If tilted more than 30°, a startup error occurs (red LED blink), requiring the aircraft to be returned to horizontal.

Servo Operation on Ground: When sticks are moved on the ground, servos may move to their limit. In AVCS mode, servos may not return to neutral when sticks are centered, which is normal. Moving sticks fully left/right three or more times within one second will temporarily return servos to neutral.

Recovery Mode

Activating the recovery mode via transmitter channel 10 allows the aircraft to automatically return to level flight. This mode can be activated from NORMAL, AVCS, or GYRO OFF states. When recovery mode is ON, releasing the stick to neutral brings the aircraft to level flight. The roll and pitch tilt angle is limited to 70° at 100% transmitter travel rate, preventing inverted flight. Decreasing travel rate reduces the maximum tilt angle and makes maneuvering feel duller.

Note: To turn off recovery mode safely, ensure the stick is at neutral before switching off the recovery mode. The MODE LED flashes white when recovery mode is ON.

Parameter Settings (via Transmitter or GPB-1)

Parameters can be set using a compatible Futaba transmitter or the GPB-1 gyro program box (requires update for GYA573, CIU-3/2 needed). Settings include:

• 1. Mount direction: Face up (default), Face left, Face down, Face right.
• 2. Servo type: DG: 285 Hz (default) for digital, AN: 70 Hz for analog.
• 3. Wing type: Normal (default), Elevon, V-tail.
• 4. SB/R2 port: RUD2 S.BUS (default), S.BUS-STD, S.BUS-HS.
• 5. E2/TH port: ELE2 PWM (default), CH3 (THR).
• Gyro reverse: Sets the direction of gyro operation for each axis. Critical for dual servos.
• Neutral offset: Sets the neutral position for each servo.
• Limit setting: Sets the maximum operating position for each servo to prevent overload and damage.
• Reset: Resets parameters to default settings.

Note: Transmitter adjustments should not be made while flying. Adjust trims at GAIN 0% or NORMAL. For AVCS mode neutral trim, switch the gain switch between 0% and AVCS mode three times within one second, ending in AVCS mode.

Monitor LED Display

GYA573 Update

The GYA573 can be updated from a PC using the separately sold CIU-3/2. Visit the Futaba website for the latest firmware and update methods: https://futabausa.com/