FTW92LA155

NTSB accident investigation · Sikorsky S-76A · Morgan City, LA · June 14, 1992

Accident · No injuriesLimited investigationFinal report
Date
June 14, 1992, 07:00 local (12:00 UTC)
Place
Morgan City, LA
Injuries
3 uninjured
Damage
Substantial damage
Phase of flight
Enroute
Aircraft
N2620Sikorsky S-76A
Weather
Visual (VMC) · Day
Status
Completed · report June 30, 1993
Report
Approved by Office Director
FAA report
19920614020049A
Case key
18515

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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Probable cause

The second pilot's failure to maintain aircraft control.

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.

Airframe/component/system failure/malfunctionCruise
Rotor drive system,oil cooler drive shaft - sheared
Emergency procedure - performedCopilot/second pilot
Precautionary landing - initiatedCopilot/second pilot
Loss of control - on ground/waterTaxi - aerial
Landing gear,main gear - overload
Aircraft control - not maintainedCopilot/second pilotCause
Object - tree(s)
Object - fence
Roll overLanding - flare/touchdown

Analysis

The second pilot was flying the helicopter to an off shore oil platform when the oil cooler drive shaft sheared on the number two engine. The flight crew performed the emergency procedure for the failure and initiated a precautionary run on landing at their departure location. The second pilot lost control of the helicopter as he taxied onto a helipad when the right main landing gear caught the edge resulting in its collapse. The tailrotor and vertical fin struck a tree and a fence before the helicopter landed hard onto the helipad.

Aircraft

Registration
N2620
Reported as
Sikorsky S-76A
Category
Helicopter
Serial number
760211
Airframe hours
10,192
Engine
Allison 250C-30S, 700 horsepower, turbo shaft
Damage
Substantial damage
Fire
On-Ground
Flight
Executive/Corporate · Part 91
Operator
Mobil Oil Explor Prod Se Inc
Registered owner
Mobil Oil Explor Prod Se Inc
Airworthiness certificate
Standard, Transport
Last inspection
100 hour · June 13, 1992 · 1 hours before
Destination
NONE · Ship Shoal 72, GM
Flight plan
Company VFR
Airport
5LA2 · Mobil Heliport, runway 7, 700 × 100 ft, grass/turf

Matched to the registry by N-number and the event date; the registry’s history has gaps, so older matches can be wrong. Compare the reported make and model.

Flight crew

As NTSB recorded them. NTSB leaves out names.

Role
Pilot
Age
46
Certificates
Commercial, Airline transport, Flight instructor
Airplane ratings
Multi-engine land, Single-engine land, Single-engine sea
Instrument ratings
Airplane, Helicopter
Medical
Class 1, Valid Medical--w/ waivers/lim
Seat
Left
Flight hours
14,582 total · 5,237 in this make and model · 13,871 as pilot in command · 94 in the last 90 days · 48 in the last 30 days · 1 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
150° at 6 knots
Visibility
10 statute miles
Lowest ceiling
None
Temperature
73 °F, dew point 72 °F
Altimeter
29.00 inHg
Observed at
PTN, 2 nm away

FAA reports on this event · 1

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

Other investigations on N2620 · 1

Matched to the same aircraft by N-number and date.