> For the complete documentation index, see [llms.txt](https://avss.gitbook.io/prs-m4ex-for-dji-m4e-and-m4t-easa-c5/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://avss.gitbook.io/prs-m4ex-for-dji-m4e-and-m4t-easa-c5/prs-m4ex-for-dji-m4e-and-m4t/operating-procedures.md).
# Operating Procedures
### 1. Installation Checklist
* [ ] Ensure that the PRS-M4EX is not damaged.
* [ ] Check that the connector on the electronics module is clean and undamaged.
* [ ] Ensure the Drone PSDK port is clear of damage or debris.
* [ ] Plug in the PRS-M4EX to the top Drone USB-C connector.
* [ ] Ensure the top mounting screws (QTY2) are properly secured and the mounting bracket (QTY 1) is installed correctly around the body of the Drone as outlined in the installation instructions.
{% hint style="danger" %}
DO NOT USE PROPELLER GUARDS WHEN USING THE PRS-M4EX, AS THIS WILL RESULT IN INTERFERENCE BETWEEN THE PRS-M4EX AND THE PROPELLERS.
{% endhint %}
### 2. Pre-Flight Checklist
* [ ] Perform the Drone's preflight checks.
* [ ] Verify and note any high-power RF emitters in the operational volume.
* [ ] Ensure the Drone is in the appropriate flight mode.
* [ ] Ensure the Drone is level and in the takeoff location.
* [ ] Turn on the PRS-M4EX by powering on the Drone.
{% hint style="danger" %}
DO NOT HANDLE OR MOVE THE DRONE ONCE THE PRS-M4EX IS TURNED ON UNLESS CALIBRATING EITHER THE PRS-M4EX IMU OR THE DRONE COMPASS. REFER TO THE "[CALIBRATION PROCESSES](/prs-m4ex-for-dji-m4e-and-m4t-easa-c5/prs-m4ex-for-dji-m4e-and-m4t/calibration-processes.md)" SECTION FOR INSTRUCTIONS ON HOW TO CALIBRATE EACH OF THESE COMPONENTS.
{% endhint %}
* [ ] Move at least five (5) metres (16 feet) away from the Drone.
* [ ] Wait for successful initialization.
* [ ] Ensure that the PSDK is connected.
* [ ] Ensure no errors are present using the PSDK info screen on the Drone's transmitter.
* [ ] Ensure the Drone's downward-facing sensors are enabled.
* [ ] Arm the MTD (Toggle the ARM button).
* [ ] Takeoff and climb to minimum deployable altitude.
{% hint style="danger" %}
AUTO-TRIGGER WILL ONLY ARM ONCE AN ALTITUDE OF 40 METRES IS REACHED. VERIFY THE ARM STATUS ON THE PSDK TEXT WINDOW \[ARMED: ATS].
{% endhint %}
{% hint style="danger" %}
MANUAL TRIGGER DEVICE CAN ONLY BE ARMED ONCE AN ALTITUDE OF 5 METRES IS REACHED.
{% endhint %}
### 3. In-Flight Checklist
{% hint style="danger" %}
THE MINIMUM FLYABLE ALTITUDE RATING FOR THE PRS-M4EX IS 40 METRES. WHEN OPERATING OVER PEOPLE, DO NOT FLY BELOW THE 40 METRES. IF THE PRS IS DEPLOYED BELOW THE MFAR, AVSS DOES NOT WARRANT THE PRS WILL PERFORM AS INTENDED.
{% endhint %}
* [ ] Always fly in Normal Mode (N-Mode), Mission Mode, or Low-Speed Mode (T-Mode).
* [ ] Fly in a safe and controlled manner.
* [ ] Avoid flying over people if unnecessary.
* [ ] Monitor the PRS status throughout the flight.
### 4. Landing Checklist
* [ ] Land the Drone gently on a level surface at a safe distance from people.
* [ ] The ATS should be temporarily disabled when the Drone is within five (5) meters (16 feet) of the ground and will be indicated by the "GROUND DETECTED!" message in the PSDK text window. The ATS should disarm approximately five (5) seconds after landing. The Drone Transmitter will indicate when the ATS disarms. Do not approach the Drone until the ATS is disarmed. If the ATS does not disarm ten (10) seconds after landing, then power off the drone without moving the drone and ensure the PRS is powered off.
* [ ] Check for the "DISARMED" message in the PSDK text window on the Drone Transmitter.
* [ ] Once the PRS-M4EX is disarmed, turn off the Drone.
* [ ] After the Drone is off, the PRS-M4EX will turn off after a few seconds.
{% hint style="danger" %}
ENSURE THE PRS-M4EX LED IS OFF BEFORE HANDLING THE DRONE.
{% endhint %}
### 5. Post-Flight Checklist (No Deployment)
* [ ] DO NOT STAND DIRECTLY OVER THE PRS-M4EX WHEN APPROACHING THE DRONE.
* [ ] Ensure the PRS-M4EX is disarmed before approaching the Drone.
* [ ] Turn off the Drone and wait three (3) seconds for the PRS to automatically turn off BEFORE handling the Drone.
* [ ] Inspect PRS-M4EX and the Drone for damage.
### 6. Deployment Checklist
* [ ] If necessary, the system can be deployed using the MTD.
* [ ] If possible, fly over a safe area free of people, cars, or obstacles.
* [ ] Press and hold the trigger button on the MTD (three {3} seconds if on the main screen, once if on a custom button).
* [ ] Visually follow the Drone’s descent to the ground.
### 7. Post-Flight Checklist (With Deployment)
* [ ] Hold the parachute by the lines and fold the canopy to prevent wind from inadvertently inflating the parachute.
* [ ] Turn off the PRS-M4EX.
* [ ] Turn off the Drone.
* [ ] Take ground photos and videos of the Drone and PRS on the ground.
* [ ] Disconnect the PRS-M4EX from the Drone.
* [ ] Verify that no components are missing.
* [ ] Contact AVSS.