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NTSB Report
July 12, 1988 · Mbb BK-117 · N135CP
Manhattan, NY
Overview
Report Status
Probable Cause
Event Type
Incident
Date
July 12, 1988
Injury Outcomes
No injuries (1 uninjured)
Location
Manhattan, NY
Aircraft
Mbb BK-117
Tail Number
N135CP
Operator
Colgate Palmolive
Injuries
None
Aircraft Damage
Minor
NTSB Number
NYC88IA186
AS THE PLT OF AN S-76 HELICOPTER WAS HOVERING TO PARK NEXT TO A PARKED MBB BK 117 HELICOPTER, N135CP, THE MAIN ROTOR BLADES OF N135CP BEGAN FLAPPING. SUBSEQUENTLY, ONE BLADE FAILED FROM DOWNWARD OVERLOAD, ABOUT 29 INCHES FROM THE MAIN RETAINING PIN CENTER.
NTSB Probable Cause
FAILURE OF THE MAIN ROTOR BLADE APPEARS TO BE THE RESULT OF A STATIC DOWNWARD BENDING OVERSTRESS, CAUSED BY ANOTHER HELICOPTER HOVERING OVER OR VERY CLOSE TO THE MAIN ROTOR BLADE AS IT WAS IN A STATIC/STOPPED POSITION.
Full Narrative
AS THE PLT OF AN S-76 HELICOPTER WAS HOVERING TO PARK NEXT TO A PARKED MBB BK 117 HELICOPTER, N135CP, THE MAIN ROTOR BLADES OF N135CP BEGAN FLAPPING. SUBSEQUENTLY, ONE BLADE FAILED FROM DOWNWARD OVERLOAD, ABOUT 29 INCHES FROM THE MAIN RETAINING PIN CENTER.
Flight
Event TypeIncident
Event Time12:10 EDT
Nearest Airport0nm N
Runway0
Runway Length0
Runway Width0
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftMbb BK-117
Tail NumberN135CP
Aircraft CategoryHeli
DamageMinor
OperatorColgate Palmolive
Operating RulePart 91
Engines2
Engine TypeTurboshaft
Engine DetailsLycoming · LTS-101 · Turboshaft · 550
Seats8
People & Injuries
Injury SummaryNo injuries (1 uninjured)
Fatal0
Serious0
Minor0
Uninjured1
Total1
Crew 1Age 51 · First Class
Conditions
ConditionsUnknown
LightDaylight
WindCalm
CeilingNone
Temperature / Dew Point0 C / 0 C
Altimeter0