# During the Landing Sequence Depending on the mission plan or flight mode, the Evo can perform a straight-line, loiter-down, or manual landing. When the Evo is executing a landing sequence, it will significantly lower the altitude. **Special care must be taken during the descent stage to avoid collision with obstacles.** When a collision seems imminent, the pilot must take control of the drone and increase altitude either by switching to a manual control mode and pulling the pitch stick down (nose up) or by repositioning the vehicle and increasing altitude. In such an occurrence, it is advised to either change the mission plan and execute an **RTL** after the change or land the vehicle manually. ### **Unstable Descent** Operator Action: **None** If the vehicle becomes unstable during landing, the landing speed, as indicated in the **Safety** features, is likely set too high. ### **No Auto Disarm After Touchdown** Operator Action: **DISARM (Emergency Action -> SHUTDOWN)** The DeltaQuad Evo should disarm automatically 5 to 10 seconds after touchdown. If the vehicle does not disarm automatically, the disarm command (Shutdown) should be sent. This command can be sent by selecting Emergency Actions - Shutdown. The reason for this could be related to landing on a significantly uneven surface or slope. It can also indicate that the sensors need calibration. ### Landing gear legs do not deploy Operator Action: **None or reposition above soft ground** If one of the landing gear legs does not deploy during descent, do not interfere, as the DeltaQuad Evo is designed to balance itself on the ground even with only three legs deployed. If two legs or more do not deploy during descent, position the vehicle above soft ground (NUDGING), such as grass, and avoid hard ground, such as concrete. {% hint style="warning" %} After an incident or crash wait **10 minutes** as the battery may become unstable. Take pictures of the vehicle from every direction. Try to document the crash and crash site as thoroughly as possible. {% endhint %} --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.deltaquad.com/tac/flight/executing-and-monitoring-a-mission/emergency-procedures/during-the-landing-sequence.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.