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NTSB Report
August 12, 1987 · Bell 206L-1 · N2764F
New Iberia, LA
Overview
Report Status
Preliminary report
Event Type
Accident
Date
August 12, 1987
Injury Outcomes
No injuries (2 uninjured)
Location
New Iberia, LA
Aircraft
Bell 206L-1
Tail Number
N2764F
Operator
Petroleum Helicopters
Injuries
None
Aircraft Damage
Substantial
NTSB Number
FTW87LA195
CREW PERFORMING PRACTICE TOUCHDOWN AUTOROTATIONS DURING A TRNG FLT. ON 4TH AUTOROTATION, ACFT TOUCHED DOWN WITH EXCESS GRND SPEED AND SKIDDED FOR APPROX 75' ON THE WET, SOFT GRASS. WHEN CREW APPLIED POWER BACK TO FLIGHT RPM THEY HEARD A GRINDING SOUND AND FELT A VIBRATION. VISUAL INSP REVEALED THAT THE TAILBOOM HAD SEPARATED AFT OF THE ATTACHMENTS DUE TO RESONANCE. THIS ACFT IS SUBJECT TO RESONANCE IF ROTOR RPM IS ALLOWED TO DECAY BELOW 70% DURING TOUCHDOWN AUTOROTATIONS OR DURING LENGTHY GROUND RUNS.
Full Narrative
CREW PERFORMING PRACTICE TOUCHDOWN AUTOROTATIONS DURING A TRNG FLT. ON 4TH AUTOROTATION, ACFT TOUCHED DOWN WITH EXCESS GRND SPEED AND SKIDDED FOR APPROX 75' ON THE WET, SOFT GRASS. WHEN CREW APPLIED POWER BACK TO FLIGHT RPM THEY HEARD A GRINDING SOUND AND FELT A VIBRATION. VISUAL INSP REVEALED THAT THE TAILBOOM HAD SEPARATED AFT OF THE ATTACHMENTS DUE TO RESONANCE. THIS ACFT IS SUBJECT TO RESONANCE IF ROTOR RPM IS ALLOWED TO DECAY BELOW 70% DURING TOUCHDOWN AUTOROTATIONS OR DURING LENGTHY GROUND RUNS.
Flight
Event TypeAccident
Event Time09:00 CDT
Nearest AirportAcadiana Reg. (0nm N)
Runway16
Runway Length5000 ft
Runway Width200 ft
Flight Plan FiledCvfr
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftBell 206L-1
Tail NumberN2764F
Aircraft CategoryHeli
DamageSubstantial
OperatorPetroleum Helicopters
Operating RulePart 91
Engines1
Engine TypeTurboshaft
Engine DetailsAllison · 250-C28 · Turboshaft · 435
Seats6
People & Injuries
Injury SummaryNo injuries (2 uninjured)
Fatal0
Serious0
Minor0
Uninjured2
Total2
Crew 1Age 39 · First Class
Conditions
ConditionsVMC
LightDaylight
Wind220° @ 7 kt
Visibility7 sm
CeilingOvercast 2000 ft
Temperature / Dew Point0 C
Altimeter29.00 inHg
Observation Time14:00
Weather SourceWFAC