Why did my drone crash?
Free AI crash analysis for PX4 ULog flight logs.
Upload your .ulg file and get an expert-style Flight Evidence Report — verdict, severity, likely cause, the exact signals that prove it, and the next action before you fly again. No manual digging through plots.
Free instant report PX4 ULog Your log, your account
You'll sign in first, then pick your .ulg file.
What the free crash report checks
PX4 EKF errors and estimator divergence
GPS loss, GPS drift, and position-loss failsafes
Vibration, IMU clipping, and motor/frame resonance
Battery voltage sag, power brownouts, and failsafe triggers
Yaw estimate errors, velocity inconsistent warnings, and flyaways
Mode changes, arming events, warnings, and crash timeline evidence
Common problems it can answer
Built for searches like why did my drone crash, PX4 ULog analyzer, PX4 EKF error crash, drone GPS loss crash, drone vibration flight log, and free drone flight log analysis.
Frequently asked questions
- What flight logs are supported?
- PX4 ULog (.ulg / .ulog) files. Upload the log straight off your SD card or QGroundControl.
- What does the report tell me?
- A verdict and severity, a confidence level, the most likely issue, an evidence timeline, the topics/signals checked (EKF, GPS, vibration, power, failsafes, parameter changes), and the recommended next action before your next flight.
- Is the drone crash analysis free?
- Yes. This page is a free PX4 ULog analyzer. Sign in, upload your own .ulg file, and FlightAssistant generates the first crash report automatically.
- Can it help with EKF, GPS, vibration, or failsafe problems?
- Yes. The report checks common PX4 crash causes including EKF innovation problems, GPS quality loss, vibration or IMU clipping, battery and power issues, failsafes, and sudden mode changes.
- Can I ask follow-up questions?
- Yes. After the report you're in a full chat with the agent — ask anything about the flight and it digs into the same log.