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NTSB Report
November 16, 1986 · Hickham Twinstar · N9731N
Bay St. Louis, MS
Overview
Report Status
Preliminary report
Event Type
Accident
Date
November 16, 1986
Injury Outcomes
No injuries (1 uninjured)
Location
Bay St. Louis, MS
Aircraft
Hickham Twinstar
Tail Number
N9731N
Injuries
None
Aircraft Damage
Substantial
NTSB Number
MIA87LA033
SHORTLY AFTER TAKEOFF ON THE INITIAL TEST FLT, SEVERE VIBRATION WAS FELT AND THE PLT ATTEMPTED TO RETURN THE FLOAT EQUIPPED ACFT TO THE WATER FOR A FORCED LDG. DUE TO LOW ALT, THE PLT HAD TO LAND IN TREES. AN EXAM OF ONE OF THE BLADES OF THE 3 BLADED COMPOSITE PROP REVEALED IT HAD SEPARATED CREATING A VIBRATION SO SEVERE THAT IT SHOOK BOTH CARBURETORS FROM THE ENGINE CAUSING THE ENG FAILURE.
Full Narrative
SHORTLY AFTER TAKEOFF ON THE INITIAL TEST FLT, SEVERE VIBRATION WAS FELT AND THE PLT ATTEMPTED TO RETURN THE FLOAT EQUIPPED ACFT TO THE WATER FOR A FORCED LDG. DUE TO LOW ALT, THE PLT HAD TO LAND IN TREES. AN EXAM OF ONE OF THE BLADES OF THE 3 BLADED COMPOSITE PROP REVEALED IT HAD SEPARATED CREATING A VIBRATION SO SEVERE THAT IT SHOOK BOTH CARBURETORS FROM THE ENGINE CAUSING THE ENG FAILURE.
Flight
Event TypeAccident
Event Time12:30 CST
Nearest Airport0nm N
Runway0
Runway Length0
Runway Width0
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftHickham Twinstar
Tail NumberN9731N
Aircraft CategoryAir
DamageSubstantial
Operating RulePart 91
Engines1
Engine TypeReciprocating
Engine DetailsRotax · 532 · Reciprocating · 40
Seats2
People & Injuries
Injury SummaryNo injuries (1 uninjured)
Fatal0
Serious0
Minor0
Uninjured1
Total1
Crew 1Age 52 · Second Class
Conditions
ConditionsVMC
LightDaylight
Wind180° @ 6 kt
Visibility4 sm
CeilingBroken clouds 15000 ft
Temperature / Dew Point68 F
Altimeter30.00 inHg
Observation Time17:47
Weather SourceWFAC