# During Takeoff ### **Toilet Bowling** Operator Action: **LAND or ALTITUDE** The vehicle should take off in a straight line after the first few meters. If the vehicle starts "toilet bowling" (circling up), the mission should be aborted and a sensor calibration must be performed. If an autonomous landing does not stop the toilet bowling behavior, **ALTITUDE** mode should be engaged for a manual landing. ### **Not Holding Position** Operator Action: **LAND or ALTITUDE** The vehicle should take off in a straight line. If the vehicle starts drifting from its position by more than a few meters, it should be commanded to **LAND**. Contact support to have your log files analyzed. If an autonomous landing cannot safely be performed, **ALTITUDE** mode should be engaged for a manual landing. **When operating in GNSS-Denied mode, some drift is expected above 10 meters.** ### **Takeoff Failure** Operator Action: **DISARM (Emergency Action -> SHUTDOWN)** If the vehicle fails to take off or only one-half of the vehicle rises, the VTOL propellers are likely damaged, mounted incorrectly, or upside down. The operator should disarm the vehicle and review the propeller configuration as described in the [manual](/tac/maintenance/propeller-replacement.md). --- # 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-takeoff.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.