NYC84MA270

NTSB accident investigation · Sikorsky S-76A · Fort Dix, NJ · August 11, 1984

Accident · FatalMajor investigationFinal report
Date
August 11, 1984, 13:10 local (17:10 UTC)
Place
Fort Dix, NJ
Injuries
1 fatal, 1 serious
Damage
Destroyed
Phase of flight
Enroute
Aircraft
N63WWSikorsky S-76A
Weather
Visual (VMC) · Day
Status
Completed
Report
Approved by Office Director
FAA report
19840811044489A
Case key
35782

From the NTSB’s public API. By law, NTSB reports can’t be used as evidence in lawsuits over the accident.

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Sequence of events

NTSB’s coding before 2008: each occurrence and phase of flight, and the causes and factors under it. The codes are defined in NTSB’s coding manual.

Loss of engine power(total) - mech failure/malfCruise - normal
Turbine assembly,turbine wheel - fatigueCause
Loss of control - in flightDescent - emergency
Rotorcraft flight control,tail rotor cable - overload
In flight collision with terrain/waterDescent - uncontrolled

Analysis

The aircrew of the helicopter contacted mcguire rapcon & obtained clearance to proceed thru the mcguire afb control zone at 1500 ft. a short time later, the crew declared an emergency. Witnesses on the ground heard a loud 'bang' & observed the helicopter suddenly lose alt. The helicopter recovered from the descent & began a turn toward rwy 6/24 at mcguire afb, then it veered sharply to the right & crashed into wooded terrain on ft dix. Trees at the accident site were damaged at an 80 deg angle from the horizon. Fire in the area of the engs was extinguished with halnon 1211 & afff agents. An exam revealed evidence of a left eng failure. There were indications that fragments from the left eng turbine had impacted the rgt eng while it (the rgt eng) was producing power. One of the tail rotor control cables & the tail rotor drive shaft were severed in the area of the rgt eng. A metalurgical check revealed indications of hi cyclic fatigue of the 2nd stage gas producer turbine wheel in the curvic coupling & labyrinth seal area.

Aircraft

Registration
N63WW
Reported as
Sikorsky S-76A
Category
Helicopter
Serial number
760188
Airframe hours
94
Engine
Allison 250-C3OS, 650 horsepower, turbo shaft
Damage
Destroyed
Flight
Business · Part 91
Registered owner
Capital Equipment Associates
Airworthiness certificate
Standard, Transport
Departed
MMU · Morristown, NJ
Destination
AIY · Atlantic, NJ
Flight plan
VFR
Airport
WRI · Mcguire Afb, runway 6, 10,000 × 200 ft, macadam

Flight crew

As NTSB recorded them. NTSB leaves out names.

Role
Pilot
Age
39
Certificates
Flight instructor, Airline transport, Commercial
Airplane ratings
Single-engine land, Multi-engine land
Instrument ratings
Helicopter, Airplane
Medical
Class 1, Valid Medical--no waivers/lim.
Seat
Right
Flight hours
4,100 total · 775 in this make and model

Weather

Conditions
Visual (VMC) · Day
Wind
100° at 5 knots
Visibility
7 statute miles
Lowest ceiling
2,200 ft overcast
Temperature
77 °F, dew point 68 °F
Altimeter
30.00 inHg
Observed at
WRI

FAA reports on this event · 1

The FAA’s own accident and incident reports, matched to the aircraft by N-number and date.