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NTSB Report
March 27, 1989 · Sikorsky S-76A · N760P
Manhattan, NY
Overview
Report Status
Probable Cause
Event Type
Accident
Date
March 27, 1989
Injury Outcomes
No injuries (4 uninjured)
Location
Manhattan, NY
Aircraft
Sikorsky S-76A
Tail Number
N760P
Operator
Executive Air Fleet
Injuries
None
Aircraft Damage
Substantial
NTSB Number
NYC89FA106
THE MAIN ROTOR BLADES OF 2 SIKORSKY S-76A HELICOPTERS MADE CTC AT THE WALL STREET HELIPORT/PARKING BARGE, AS ONE (N586C)WAS PARKED IN SPOT 11 WITH THE ROTORS TURNING & THE OTHER (N760P) LNDD IN SPOT 12. THE PLTS OF N586C HAD LNDD 7 MINEARLIER & WERE WAITING FOR PAX. THE UNICOM OPERATOR SAID THAT AS N760P WAS ARRIVING, HE TOLD THE PLTS THERE WAS ANOTHERHELICOPTER 'TURNING ON SPOT 11 & TO PARK ALONG SIDE THEM AT THEIR DISCRETION.' AN INV REVEALED THE BARGE HAD 12 PARKINGSPOTS. THE PADS AT SPOTS 4, 5 & 6 WERE DESIGNATED FOR S-76 HELICOPTERS & MEASURED 57'. THE OTHER PARKING SPOTS WERE FORBELL 222'S & WERE 45' APART. THE MAIN ROTOR SPAN OF AN S-76 WAS 44'. N586C WAS PARKED ABT 4' LEFT OF SPOT 11'S CENTER-LINE. AS N760P LNDD IN THE CENTER OF SPOT 12 (LEFT OF SPOT 11), THE ROTOR BLADES INTERMESHED. NEITHER CREW WAS ADZD THATSPOTS 4, 5 & 6 WERE FOR LARGER (S-76) HELICOPTERS. EXISTING FAA ADVISORIES FOR HELIPORTS DID NOT PROVIDE FOR MARKINGSTO INDICATE THE MAXIMUM ROTOR DIAMETER ACCEPTABLE FOR DESIGNATED PARKING AREAS.
NTSB Probable Cause
THE PILOT OF THE OTHER HELICOPTER MISJUDGED CLEARANCE BETWEEN HIS AND THE OTHER HELICOPTER. FACTORS RELATED TO THE ACCIDENT WERE: INADEQUATE LAYOUT (MARKINGS) OF THE HELIPORT PARKING AREA, INSUFFICIENT STANDARD/REQUIREMENT FOR NUMERICAL INDICATION OF MAXIMUM ROTOR DIAMETER ACCOMMODATIONS AT THE HELICOPTER PARKING FACILITIES. FAILURE OF THE UNICOM OPERATOR TO ADVISE THE PILOTS OF PARKING SPOTS THAT WERE DESIGNATED FOR LARGER (S-76) HELICOPTERS, AND THE PROXIMITY OF THE OTHER HELICOPTER.
Full Narrative
THE MAIN ROTOR BLADES OF 2 SIKORSKY S-76A HELICOPTERS MADE CTC AT THE WALL STREET HELIPORT/PARKING BARGE, AS ONE (N586C)WAS PARKED IN SPOT 11 WITH THE ROTORS TURNING & THE OTHER (N760P) LNDD IN SPOT 12. THE PLTS OF N586C HAD LNDD 7 MINEARLIER & WERE WAITING FOR PAX. THE UNICOM OPERATOR SAID THAT AS N760P WAS ARRIVING, HE TOLD THE PLTS THERE WAS ANOTHERHELICOPTER 'TURNING ON SPOT 11 & TO PARK ALONG SIDE THEM AT THEIR DISCRETION.' AN INV REVEALED THE BARGE HAD 12 PARKINGSPOTS. THE PADS AT SPOTS 4, 5 & 6 WERE DESIGNATED FOR S-76 HELICOPTERS & MEASURED 57'. THE OTHER PARKING SPOTS WERE FORBELL 222'S & WERE 45' APART. THE MAIN ROTOR SPAN OF AN S-76 WAS 44'. N586C WAS PARKED ABT 4' LEFT OF SPOT 11'S CENTER-LINE. AS N760P LNDD IN THE CENTER OF SPOT 12 (LEFT OF SPOT 11), THE ROTOR BLADES INTERMESHED. NEITHER CREW WAS ADZD THATSPOTS 4, 5 & 6 WERE FOR LARGER (S-76) HELICOPTERS. EXISTING FAA ADVISORIES FOR HELIPORTS DID NOT PROVIDE FOR MARKINGSTO INDICATE THE MAXIMUM ROTOR DIAMETER ACCEPTABLE FOR DESIGNATED PARKING AREAS.
Flight
Event TypeAccident
Event Time15:55 EST
Nearest AirportWall St Heliport (0nm N)
Runway0
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftSikorsky S-76A
Tail NumberN760P
Aircraft CategoryHeli
DamageSubstantial
OperatorExecutive Air Fleet
Operating RulePart 91
Engines2
Engine TypeTurboshaft
Engine DetailsAllison · 250-C30S · Turboshaft · 650 | Allison · 250-C305 · Turboshaft · 650
Seats8
People & Injuries
Injury SummaryNo injuries (4 uninjured)
Fatal0
Serious0
Minor0
Uninjured4
Total4
Crew 1Age 57 · First Class
Crew 2Age 37 · First Class
Conditions
ConditionsVMC
LightDaylight
Wind160° @ 14 kt
Visibility10 sm
CeilingNone
Temperature / Dew Point55 / 41 C
Altimeter30.00 inHg
Observation Time21:00
Weather SourceWFAC