Issued: June 2015
Effectivity: Beechcraft King Air Model F90, all serial numbers;
Beechcraft King Air 200 series (U.S. Military King Air models equipped with ground idle solenoids), all serial numbers; Beechcraft King Air 300 series (King Air 300, 300LW, B300, B300C), all serial numbers.
Subject: Uncommanded Yaw Events
Beechcraft Corporation is issuing this Safety Communiqué to advise owner/operators/flight crews of airplanes listed of a potential safety condition related to uncommanded yaw events during the flare portion of a normal landing.
Beechcraft Corporation has received uncommanded yaw event reports on the models listed above. Beechcraft and Pratt and Whitney Canada (PWC) have investigated previous reports and in some cases, corrected the issue by proper rigging of engine controls or replacement of the primary governor. Events have occurred on airplanes with various engine types including certain PWC PT-6A-42, PT-6A-60A, PT-6A-65, and PT-6A-67 series engines with similar ground idle solenoid/beta valve configurations.
The reports have described significant, uncommanded yaw events that were controlled by appropriate flight control input. Beechcraft Corporation is issuing this Safety Communiqué to advise owner/operators/flight crews of this condition and emphasize that there is a potential for the condition to repeat itself.
Beechcraft Corporation and PWC will continue to investigate this condition to gather more information concerning this issue. Additional information will be issued as appropriate. For technical questions, please contact your local Beechcraft Field Service Representative or Beechcraft Corporation Technical Support at 1 (800) 429-5372 or 1 (316) 676-3140.
The above information is abbreviated for space purposes.
For the entire communication, go to www.beechcraft.com.
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