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NTSB Report
January 4, 1985 · Swearingen SA226TC · N322BA
St. Louis, MO
Overview
Report Status
Preliminary report
Event Type
Incident
Date
January 4, 1985
Injury Outcomes
No injuries (5 uninjured)
Location
St. Louis, MO
Aircraft
Swearingen SA226TC
Tail Number
N322BA
Operator
Britt Airways
Injuries
None
NTSB Number
MKC85IA045
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.
Full Narrative
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.
Flight
Event TypeIncident
Event Time16:10 CST
Nearest Airport0nm N
Runway0
Runway Length0
Runway Width0
Flight Plan FiledIFR
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftSwearingen SA226TC
Tail NumberN322BA
Aircraft CategoryAir
OperatorBritt Airways
Operating RulePart 135
Engines2
Engine TypeTurboprop
Engine DetailsAiresearch · TPE3313UW303G · Turboprop · 940
Seats17
People & Injuries
Injury SummaryNo injuries (5 uninjured)
Fatal0
Serious0
Minor0
Uninjured5
Total5
Crew 1Age 35 · First Class
Conditions
ConditionsVMC
LightDaylight
Wind290° @ 13 kt
Visibility7 sm
CeilingNone
Temperature / Dew Point36 C / 27 C
Altimeter29.00 inHg
Observation Time21:48
Weather SourceWFAC