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NTSB Report
January 2, 1982 · Bell 206L-1 · N5745Y
Chamblee, GA
Overview
Report Status
Preliminary report
Event Type
Accident
Date
January 2, 1982
Injury Outcomes
No injuries (1 uninjured)
Location
Chamblee, GA
Aircraft
Bell 206L-1
Tail Number
N5745Y
Operator
Rocky Mountain Helicopters In
Injuries
None
Aircraft Damage
Substantial
NTSB Number
ATL82DA027
WHILE RETURNING TO REFUEL FROM AN AIR AMBULANCE FLIGHT THE HELICOPTER YAWED LEFT AND N2 DROPPED TO ABOUT 92% APPROXIMATELY ONE MILE FROM THE AIRPORT. AT 30-50 FEET WITH AIRSPEED AT ABOUT 20 KNOTS THE AIRCRAFT YAWED VIOLENTLY TO THE LEFT WITH CORRESPONDING DROPS IN N2 TO 55-60% THEN SURGED BACK TO 102-105%. THE PILOT ENTERED AUTOROTATION AND TOUCHED DOWN HARD 300 YARDS SHORT OF HIS INTENDED LANDING POINT. DETROIT DIESEL ALLISON COMMERCIAL ENGINE BULLETIN(CEB) A-73-2020 DATED 9/7/81 & REVISED 10/5/81 ADVOCATES DISARMING THE N2(ELECTRONIC) OVERSPEED CONTROL SYSTEM BECAUSE OF REPORTED INTERMITTENT AND SPURIOUS ACTIVATION OF THAT SYSTEM. THE SYSTEM WAS ONLY PARTIALLY DEACTIVATED IN COMPLIANCE WITH BELL ALERT SERVICE BULLETIN(ASB) 206L-81-24 DATED 9/11/81 DUE TO THE OPERATOR'S MAINTENANCE PERSONNEL REPORTING THAT THEY HAD NOT RECEIVED THE REFERENCED CEB AS OF THE DATE OF THE ACCIDENT.
Full Narrative
WHILE RETURNING TO REFUEL FROM AN AIR AMBULANCE FLIGHT THE HELICOPTER YAWED LEFT AND N2 DROPPED TO ABOUT 92% APPROXIMATELY ONE MILE FROM THE AIRPORT. AT 30-50 FEET WITH AIRSPEED AT ABOUT 20 KNOTS THE AIRCRAFT YAWED VIOLENTLY TO THE LEFT WITH CORRESPONDING DROPS IN N2 TO 55-60% THEN SURGED BACK TO 102-105%. THE PILOT ENTERED AUTOROTATION AND TOUCHED DOWN HARD 300 YARDS SHORT OF HIS INTENDED LANDING POINT. DETROIT DIESEL ALLISON COMMERCIAL ENGINE BULLETIN(CEB) A-73-2020 DATED 9/7/81 & REVISED 10/5/81 ADVOCATES DISARMING THE N2(ELECTRONIC) OVERSPEED CONTROL SYSTEM BECAUSE OF REPORTED INTERMITTENT AND SPURIOUS ACTIVATION OF THAT SYSTEM. THE SYSTEM WAS ONLY PARTIALLY DEACTIVATED IN COMPLIANCE WITH BELL ALERT SERVICE BULLETIN(ASB) 206L-81-24 DATED 9/11/81 DUE TO THE OPERATOR'S MAINTENANCE PERSONNEL REPORTING THAT THEY HAD NOT RECEIVED THE REFERENCED CEB AS OF THE DATE OF THE ACCIDENT.
Flight
Event TypeAccident
Event Time18:37 EST
Nearest Airport0nm N
Runway34
Runway Length5001 ft
Runway Width100 ft
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftBell 206L-1
Tail NumberN5745Y
Aircraft CategoryHeli
DamageSubstantial
OperatorRocky Mountain Helicopters In
Operating RulePart 135
Engines1
Engine TypeTurboshaft
Engine DetailsAllison · 250-C28B · Turboshaft · 435
Seats5
People & Injuries
Injury SummaryNo injuries (1 uninjured)
Fatal0
Serious0
Minor0
Uninjured1
Total1
Crew 1Age 37 · Second Class
Conditions
ConditionsVMC
LightDark Night
Wind90° @ 10 kt
Visibility10 sm
CeilingNone
Temperature / Dew Point12 C / 0 C
Altimeter30.00 inHg
Observation Time18:38