udev rules are installed correctly

Rules of the Road (see: Navigation Rules)

installed eavesdropping device

No webview application installed / enabled

Check that the Roll, Pitch and other bar graphs move correctly

Configure the Receiver settings correctly

data might not have been written correctly

verify all motors are spinning correctly

international rules in force

regulations, rules and policies

Rules of Engagement (ROE)

clearance rules

certification rules

aeronautical rules

visual flight rules (VFR)

air safety rules

design rules

flying safety rules

general operating rules

instrument flight rules (IFR)

instrument flight rules operation

instrument rules flight

visual flight rules

VFR traffic (visual flight rules)

navigation rules

security rules

firing rules