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NTSB Report
September 12, 1984 · Agusta A109 · N57BL
Clifton, AZ
Overview
Report Status
Preliminary report
Event Type
Accident
Date
September 12, 1984
Injury Outcomes
No injuries (2 uninjured)
Location
Clifton, AZ
Aircraft
Agusta A109
Tail Number
N57BL
Injuries
None
Aircraft Damage
Substantial
NTSB Number
LAX84LA478
THE PLT REPORTED THAT HE LANDED FIRMLY ON THE GROUND AT THE MAIN RAMP & WENT INTO THE 2 MIN COOL DOWN MODE FOR ENG SHUTDOWN. HE STATED THAT IMMEDIATELY AFTER THE POWER LEVERS WERE RETARDED TO IDLE, HE FELT A SLIGHT LATERAL MOVEMENT OF THE CONTROLS WHICH WAS FOLLOWED BY AN ACCELERATED LATERAL MOVEMENT OF THE HELICOPTER. HE STATED THAT THE HELICOPTER THEN WENT INTO A VIOLENT LATERAL & FORWARD VIBRATION. HE SHUT OFF THE ENG & APPLIED THE ROTOR BRAKE. HOWEVER, BEFORE THE VIBRATION STOPPED, THE TAILROTOR ASSEMBLY HIT THE GROUND & THE MAIN GEAR COLLAPSED. NO PRE-ACCIDENT PART FAILURE OR MALFUNCTION WAS FOUND THAT WOULD HAVE RESULTED IN THE VIBRATION OR GROUND RESONANCE.
Full Narrative
THE PLT REPORTED THAT HE LANDED FIRMLY ON THE GROUND AT THE MAIN RAMP & WENT INTO THE 2 MIN COOL DOWN MODE FOR ENG SHUTDOWN. HE STATED THAT IMMEDIATELY AFTER THE POWER LEVERS WERE RETARDED TO IDLE, HE FELT A SLIGHT LATERAL MOVEMENT OF THE CONTROLS WHICH WAS FOLLOWED BY AN ACCELERATED LATERAL MOVEMENT OF THE HELICOPTER. HE STATED THAT THE HELICOPTER THEN WENT INTO A VIOLENT LATERAL & FORWARD VIBRATION. HE SHUT OFF THE ENG & APPLIED THE ROTOR BRAKE. HOWEVER, BEFORE THE VIBRATION STOPPED, THE TAILROTOR ASSEMBLY HIT THE GROUND & THE MAIN GEAR COLLAPSED. NO PRE-ACCIDENT PART FAILURE OR MALFUNCTION WAS FOUND THAT WOULD HAVE RESULTED IN THE VIBRATION OR GROUND RESONANCE.
Flight
Event TypeAccident
Event Time16:20 MST
Nearest AirportGreenlee Co. (0nm N)
Runway25
Runway Length4960 ft
Runway Width75 ft
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftAgusta A109
Tail NumberN57BL
Aircraft CategoryHeli
DamageSubstantial
Operating RulePart 91
Engines2
Engine TypeTurboshaft
Engine DetailsAllison · 250-C20B · Turboshaft · 420
Seats7
People & Injuries
Injury SummaryNo injuries (2 uninjured)
Fatal0
Serious0
Minor0
Uninjured2
Total2
Crew 1Age 40 · First Class
Conditions
ConditionsVMC
LightDaylight
Wind240° @ 5 kt
Visibility50 sm
CeilingNone
Temperature / Dew Point59
Altimeter0
Observation Time16:20
Weather SourcePILO