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NTSB Report
July 22, 1991 · Bell 47G-2 · N312SH
Slidell, LA
Overview
Report Status
Probable Cause
Event Type
Accident
Date
July 22, 1991
Injury Outcomes
No injuries (2 uninjured)
Location
Slidell, LA
Aircraft
Bell 47G-2
Tail Number
N312SH
Operator
Sunrise Helicopters
Injuries
None
Aircraft Damage
Substantial
NTSB Number
FTW91LA125
THE PILOT INITIATED THE AUTOROTATION AT APPROXIMATELY 500 FEET AND 60 KNOTS. THE PILOT AND THE FAA CHECK AIRMAN STATED THE MAIN ROTOR RPM WAS IN THE 'LOW GREEN' RANGE. A PARTIAL LOSS OF CONTROL WAS EXPERIENCED IN THE FLARE RESULTING IN THE RIGHT SKID SINKING SEVERAL INCHES INTO THE WET GRASSY TERRIN. THE HELICOPTER SKIDDED APPROXIMATELY 15 FEET, COMING TO REST IN A NOSE-LOW LEFT BANK ATTITUDE. THE MAIN ROTORS STRUCK THE TAILBOOM, SEVERING IT. THE PILOT STATED HE HAD INFORMED THE CHECK AIRMAN THE GRASS WAS WET. THE AUTOROTATION TO TOUCHDOWN WAS NOT A REQUIRED MANEUVER, NOR WAS IT PROHIBITED. THE CHECK AIRMAN DID NOT INTERVENE DURING THE CONDUCT OF THE AUTOROTATION.
NTSB Probable Cause
THE PILOT PERFORMING A TOUCHDOWN AUTOROTATION TO UNSUITABLE TERRAIN. FACTORS WERE THE SOFT TERRAIN AND THE INADEQUATE SUPERVISION BY THE FAA INSPECTOR.
Full Narrative
THE PILOT INITIATED THE AUTOROTATION AT APPROXIMATELY 500 FEET AND 60 KNOTS. THE PILOT AND THE FAA CHECK AIRMAN STATED THE MAIN ROTOR RPM WAS IN THE 'LOW GREEN' RANGE. A PARTIAL LOSS OF CONTROL WAS EXPERIENCED IN THE FLARE RESULTING IN THE RIGHT SKID SINKING SEVERAL INCHES INTO THE WET GRASSY TERRIN. THE HELICOPTER SKIDDED APPROXIMATELY 15 FEET, COMING TO REST IN A NOSE-LOW LEFT BANK ATTITUDE. THE MAIN ROTORS STRUCK THE TAILBOOM, SEVERING IT. THE PILOT STATED HE HAD INFORMED THE CHECK AIRMAN THE GRASS WAS WET. THE AUTOROTATION TO TOUCHDOWN WAS NOT A REQUIRED MANEUVER, NOR WAS IT PROHIBITED. THE CHECK AIRMAN DID NOT INTERVENE DURING THE CONDUCT OF THE AUTOROTATION.
Flight
Event TypeAccident
Event Time12:25 CDT
Nearest AirportSLIDELL (0nm N)
Runway0
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftBell 47G-2
Tail NumberN312SH
Aircraft CategoryHeli
DamageSubstantial
OperatorSunrise Helicopters
Operating RulePart 91
Engines1
Engine TypeReciprocating
Engine DetailsLycoming · VO-435-A1B · Reciprocating · 200
Seats3
People & Injuries
Injury SummaryNo injuries (2 uninjured)
Fatal0
Serious0
Minor0
Uninjured2
Total2
Crew 1Age 40 · Second Class
Conditions
ConditionsVMC
LightDaylight
Wind10° @ 6 kt
Visibility10 sm
CeilingBroken clouds 25000 ft
Temperature / Dew Point0 C / 0 C
Altimeter0
Weather SourcePILO