NTSB Identification: MKC85IA045.
The docket is stored on NTSB microfiche number 28158.
Scheduled 14 CFR
Incident occurred Friday, January 04, 1985 in ST. LOUIS, MO
Aircraft: SWEARINGEN SA226TC, registration: N322BA
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.

AFTER DEPARTING ST LOUIS AND REACHING CRUISE FLT THE CREW EXPERIENCED A CONTINUAL TRIM PITCH-UP WHICH HAD TO BE RELIEVED BY A REDUCED AIRSPEED. NO AURAL INDICATION WAS NOTED BY THE CREW. THE RETURN TO THE AIRPORT WAS UNEVENTFUL. FOLLOW-UP INSPECTION OF THE TRIM SYSTEM REVEALED A OUT OF TOLERANCE TRIM ACTUATOR WITH 355 OPERATIONAL HOURS SINCE O-TIME OVERHAUL. NORMAL LIFE FOR A TRIM ACTUATOR IS ABT 2000 HOURS. THIS UNIT WAS CERTIFIED AS O-TIME BY AN FAA CERTIFIED SHOP. A TEARDOWN INSPECTION OF THE TRIM ACTUATOR UNIT REVEALED THAT THE UNIT WAS NOT OVERHAULED TO SPECIFICATIONS OF THE UNIT MANUFACTURER. THE TRIM ACTUATOR WAS INADEQUATE FOR OPERATION AS OVERHAULED.

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

MAINTENANCE,OVERHAUL..INADEQUATE..OTHER MAINTENANCE PERSONNEL



Contributing Factors

INADEQUATE SURVEILLANCE OF OPERATION..FAA(ORGANIZATION)

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