Maintenance Guidelines.

I. Checking the Battery

1. Check the battery for damage and deformities. If there are any signs of damage to the battery, stop using it and discharge the battery to 10% or below for disposal. Do not disassemble the battery for an y

reason. 2. Check the battery pins and rub them clean with a n eraser if any residue is observed. This will help to

ensure a more reliable connection. 3. Check the metal battery power connectors for dam age. If the connectors appear burnt, try to clear them. This can be done by inserting a piece of sand paper (1mm thick) into the connectors to polish the

metal. 4. Check the contact pins in the battery compartmen t to ensure that the pins are clear. They should be able to establish easy contact with the battery con nectors and should not be bent. 5. Check the electrodes on the battery. If they app ear burnt, polish them with sandpaper. If there is serious erosion, send the battery in for repairs. 6. Check the components of the battery bracket to s ee it is in good condition and that all screws are secure. This prevents the battery from becoming loo se during flight. 7. Check the power cables between the arms and the center plate, if the cables are worn, replace. 8. For long term storage, please refer to the “Flig ht Battery Safety Guidelines” and check the battery once a month to prevent the battery cell from being damaged. 9. Monitor battery health and confirm that all batt ery cells are at similar voltage levels and stay at the same level when the battery is fully charged. If al l cells maintain voltage levels above 3.7V but any cell is 0.2V higher or lower than the others, replace batte ry.

II. Checking the Aircraft

1. Confirm that all the screws are still adequately tightened. 2. Check the aircraft for breaks or damage. If ther e is any reason to believe that detectable damage might affect flight safety, perform proper and nece ssary maintenance . 3. Check the tubes of the arms for damage. 4. Check the dampers on the landing gears. If they are loose, secure them with 502 glue.

5. Ensure that there are no obstacles on or around the GPS module or around the antennas on the landing gear. Remove any obstacles (such as tapes w ith conductive material) that might affect or block the signal. 6. Check that the right and left landing gear rest at the same tilt angle.

III. Checking the Motors

1. Check the rotors to confirm that they have not b ecome loose. 2. Detach the propellers and start the motors. List en carefully. If there is any abnormal noise, pleas e replace the motors. This may be a sign that the bea rings have been worn out. 3. Detach the propellers and start the motors. Care fully examine the edge of the rotor and confirm tha t the shaft is perfectly centered on the motor. Check for any abnormal or excessive vibration. If any problems are detected, replace motors.

4. Ensure that the screws used to secure the motor bases are tight and the plastic components around the motors are in good condition. If not please tig hten the screws and repair any broken plastic

components.IV. Checking the Propellers

1. Check the propellers. If there is any bending, b reakage or cracking on a propeller, replace. 2. Attach the propeller to the motor, turn on the a ircraft, and place it on the ground. Stand 1 meter away from the aircraft and observe the rotating pro pellers. If you can see two distinct propeller outl ine layers, when looking at a spinning propeller from t he side, this propeller is damaged and should not b e used.

VI. Checking the PixHawk Flight Control Unit (FCU)

1. Open the PixHawk/Mission planner app to check th e condition of the FCU and perform an advanced FCU calibration. Please place the aircraft in a coo l environment and on a flat, stable surface. Do no t touch the craft during the calibration.

V. Checking the Control and Video Transmission Syst em

1. Check the antenna on the landing gear to ensure that it is are secure. Also check for any bending o r damage.

2. Check the antennas of the remote controller for damage. 3. Check the neck strap for damage or wear, replace if necessary.

VI. Checking the Gimbal and Camera

1. The quick-mount connector for the camera is a pa rticularly vulnerable component. If the gimbal fail s to initialize when turned on, fails to work after i nitialization, or fails to transmit video to the ap p (while OSD data is displayed), the quick-mount connector m ay be worn. In this case, replace the rubber mat, circuit board, and/or connector on the gimbal quick -mount. 2. Check the metal contacts on the quick mount conn ector board, if any contact is bent, replace the quick-mount connector. 3. Check the contact pins on the quick-mount connec tor board, if there is any dirt, rub it clean with an eraser. If any contact pins are worn out it should be replaced. 4. Confirm that the gimbal is able to properly stab ilize itself. If its stabilizing performance deteri orates, Repair or replace.