STEP 3: Lift the TYPHOON H PLUS airframe straight and level. When the LEDs on two motors start to blink greenas illustrated, turn it forward as shown by the red arrow until a tone is heard and the two LEDs turn off.STEP 4: Repeat this procedure for all six positions.If the calibration has been successful, the flight controller will restart. You will recognize this when you hearthe acknowledgement tone, the same one you hear when you switch the system on.IMPORTANT NOTE: If the calibration has failed, all LED Status Indicators will blink red rapidly and youmust repeat the calibration process. If the calibration continues to fail, either the site of calibration is unsuit-able or the compass is defective. Refer to YUNEEC service center.Compass CalibrationCAUTION: Do not calibrate the compass in parking garages, close tobuildings or near roads with a metal core. For optimum perfor-mance, only calibrate TYPHOON H PLUS in open spaces, far awayfrom power lines and other metal structures or concrete buildings.NOTICE: Be sure to perform the compass calibration procedure atleast 11 feet away from the nearest cell phone or other electronicdevices to ensure proper calibration.STEP 1: Power on the ST16S Ground Station first and then the air-craft, and make sure they are connected correctly. If they are notconnected correctly, the telemetry data will not display on thescreen.STEP 2: Tap the System icon on the top right corner on the ST16S,and then enter the aircraft setting interface by tapping , selectthe Compass Calibration.Installing the PropellersEach arm of theTYPHOON H PLUS has a letter A or letter B labeled on it.“A” arms have black center buttons; “B” arms have white center buttons.Each propeller has an A or B label etched into the blade. “A” propellerscannot be attached to “B” motors, nor can “B” motors be mounted to an“A” motor.Match the A propellers with the A arms (black center button) and the Bpropellers with the B arms (white center button). Place the prop on themotor, lightly press down and while holding the motor and turn the propa quarter turn. A click will be heard and the center button will slightly popup. Hold the motor and test propeller security to assure a locked propeller.Disassembling the propellersPress and hold the center button into the mounting plate, and then rotatethe propeller in the direction the arrow points to.IMPORTANT NOTE: Always check the props for damage and roughedges. Damaged props may cause in flight vibrations causing unwantedflight characteristics. Propellers should be replaced every 20 flight hours.ABBB09