NTSB Identification: CEN11LA192
Nonscheduled 14 CFR Part 91: General Aviation
Accident occurred Tuesday, February 15, 2011 in Des Moines, IA
Probable Cause Approval Date: 07/21/2011
Aircraft: BEECH E-90, registration: N51DN
Injuries: 2 Uninjured.

NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.

The airplane had recently undergone maintenance, which included an inspection of the ailerons requiring removal, reinstallation, and a functional check. Prior to the test flight, the pilot performed a pre-flight inspection of the airplane and a flight control free and correct check with no anomalies noted. While executing a turn at flight level 180, the right aileron departed the airplane. The airplane landed without further incident. Examination of the airplane revealed the inboard and middle airframe aileron hinge brackets were attached to the aft spar, intact, and showed no visible damage. The outboard airframe aileron hinge bracket was pulled and separated from the aft spar. The aileron was not located. Based on the condition of the hinge brackets, the evidence indicated the aileron bolts were not properly engaged in the aileron nut plates which caused the bolts to fall out and the aileron to depart the airplane.

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

The improper installation of the right aileron by maintenance personnel.

Full narrative available

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