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NTSB Report
June 13, 1992 · Mcdonnell Douglas 369E · N684F
Yukon, OK
Overview
Report Status
Probable Cause
Event Type
Accident
Date
June 13, 1992
Injury Outcomes
No injuries (2 uninjured)
Location
Yukon, OK
Aircraft
Mcdonnell Douglas 369E
Tail Number
N684F
Operator
Oklahoma City Police Dept
Injuries
None
Aircraft Damage
Substantial
NTSB Number
FTW92GA160
THE MANUFACTURER'S TRAINING PILOT WAS CONDUCTING UNAPPROVED 'ZERO AIRSPEED' AUTOROTATION TRAINING IN CONJUNCTION WITH ANNUAL PROFICIENCY TRAINING FOR THE POLICE AVIATION SUPPORT UNIT. HE WAS NOT A CERTIFIED FLIGHT INSTRUCTOR. AFTER HE DEMONSTRATED THE MANEUVER, THE POLICE PILOT ATTEMPTED IT. THE HELICOPTER CONTACTED THE GROUND WITH LOW MAIN ROTOR RPM AND NOT IN A LEVEL ATTITUDE. THE MAIN ROTOR BLADES SEVERED THE TAIL OF THE HELICOPTER. THE POLICE PILOT STATED THAT THIS AND OTHER EMERGENCY PROCEDURE MANEUVERS WERE NOT COVERED IN THE BRIEFING CONDUCTED BEFORE THE FLIGHT.
NTSB Probable Cause
THE DUAL STUDENT'S FAILURE TO MAINTAIN ADEQUATE MAIN ROTOR RPM AND FAILURE TO LEVEL THE HELICOPTER AT TOUCHDOWN. FACTORS WERE THE MANUFACTURER'S TRAINING PILOT'S INADEQUATE SUPERVISION AND THE DUAL STUDENT PERFORMING THE MANEUVER.
Full Narrative
THE MANUFACTURER'S TRAINING PILOT WAS CONDUCTING UNAPPROVED 'ZERO AIRSPEED' AUTOROTATION TRAINING IN CONJUNCTION WITH ANNUAL PROFICIENCY TRAINING FOR THE POLICE AVIATION SUPPORT UNIT. HE WAS NOT A CERTIFIED FLIGHT INSTRUCTOR. AFTER HE DEMONSTRATED THE MANEUVER, THE POLICE PILOT ATTEMPTED IT. THE HELICOPTER CONTACTED THE GROUND WITH LOW MAIN ROTOR RPM AND NOT IN A LEVEL ATTITUDE. THE MAIN ROTOR BLADES SEVERED THE TAIL OF THE HELICOPTER. THE POLICE PILOT STATED THAT THIS AND OTHER EMERGENCY PROCEDURE MANEUVERS WERE NOT COVERED IN THE BRIEFING CONDUCTED BEFORE THE FLIGHT.
Flight
Event TypeAccident
Event Time10:35 CDT
Nearest AirportClarence E. Page (0nm)
Runway0
Runway Length1500 ft
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftMcdonnell Douglas 369E
Tail NumberN684F
Aircraft CategoryHeli
DamageSubstantial
OperatorOklahoma City Police Dept
Operating RulePart 91
Engines1
Engine TypeTurboshaft
Engine DetailsAllison · 250-C20B · Turboshaft · 425
Seats4
People & Injuries
Injury SummaryNo injuries (2 uninjured)
Fatal0
Serious0
Minor0
Uninjured2
Total2
Crew 1Age 46 · Second Class
Conditions
ConditionsVMC
LightDaylight
Wind50° @ 6 kt
Visibility6 sm
CeilingNone
Temperature / Dew Point64 F
Altimeter29.00 inHg
Observation Time15:48
Weather SourceWFAC