NTSB Identification: CHI84IA114.
The docket is stored on NTSB microfiche number 24534.
Scheduled 14 CFR
Incident occurred Wednesday, February 22, 1984 in CHAMPAIGN, IL
Aircraft: BEECH 99, registration: N313BA
Injuries: 5 Uninjured.

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

THE PLT REPORTED THAT DURING ARRIVAL TO THE DESTINATION ARPT, HE HEARD A LOUD BANG & THE ACFT BEGAN ROLLING TO THE RIGHT. HE REPORTED THAT HE WAS UNABLE TO CONTROL THE ROLL WITH THE AILERONS, SO HE REDUCED POWER ON THE LEFT ENG & APPLIED LEFT RUDDER. THE CREW WAS THEN ABLE TO MAINTAIN DIRECTIONAL CONTROL OF THE ACFT & MADE A SAFE LANDING. AFTER LANDING, THE LEFT AILERON WAS FOUND TO BE BENT AT THE 2ND HINGE POINT. AN INVESTIGATION REVEALED THAT ON 2/20/84, THE SCREWS ON THE OUTBOARD HINGE OF THE LEFT AILERON WERE IMPROPERLY INSTALLED. THIS ALLOWED THE OUTBOARD SECTION OF THE AILERON TO COME LOOSE.

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

FLIGHT CONTROL,AILERON ATTACHMENT..DISCONNECTED

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

MAINTENANCE,INSTALLATION..IMPROPER..COMPANY MAINTENANCE PERSONNEL

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