As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(DN8S) HAVE HAD (2) CARBURETORS DO THIS IN THE LAST 6 MONTHS. THE PUMP IDLER LEVER SCREW HAS COME LOOSE ON ITS OWN. IT USES A TABBED SAFETY GASKET AND TTHIS HAS NOT STOPPED IT FROM COMING LOOSE. WHEN THIS HAPPENS IT SIGNIFICANTLY AFFECTS THE ACFT`S PERFORMANCE. HAVE NARROWLY AVOIDED ACCIDENTS/ INCIDENTS.