- Date
- June 13, 1992, 10:35 local (15:35 UTC)
- Place
- Yukon, OK
- Injuries
- 2 uninjured
- Damage
- Substantial damage
- Phase of flight
- Landing
- Aircraft
- N684FMcdonnell Douglas 369E
- Weather
- Visual (VMC) · Day
- Status
- Completed · report June 30, 1993
- Report
- Approved by Office Director
- FAA report
- 19920613020279A
- Case key
- 18382
From the NTSB’s public API. By law, NTSB reports can’t be used as evidence in lawsuits over the accident.
On this page
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.
Sequence of events
NTSB’s coding before 2008: each occurrence and phase of flight, and the causes and factors under it. The codes are defined in NTSB’s coding manual.
Analysis
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.
Aircraft
- Registration
- N684F
- Reported as
- Mcdonnell Douglas 369E
- Category
- Helicopter
- Serial number
- 0491E
- Airframe hours
- 442
- Engine
- Allison 250-C20B, 425 horsepower, turbo shaft
- Damage
- Substantial damage
- Flight
- Public aircraft · Part 91
- Operator
- Oklahoma City Police Dept
- Registered owner
- Oklahoma City Police Dept
- Airworthiness certificate
- Standard, Normal
- Last inspection
- 100 hour · May 8, 1992 · 35 hours before
- Departed
- 2DT · Oklahoma City, OK
- Destination
- F29
- Airport
- F29 · Clarence E. Page
Matched to the registry by N-number and the event date; the registry’s history has gaps, so older matches can be wrong. Compare the reported make and model.
Flight crew
As NTSB recorded them. NTSB leaves out names.
- Role
- Pilot
- Age
- 46
- Certificate
- Commercial
- Instrument ratings
- Helicopter
- Medical
- Class 2, Valid Medical--w/ waivers/lim
- Seat
- Right
- Flight hours
- 8,200 total · 1,400 in this make and model · 7,676 as pilot in command · 60 in the last 90 days · 30 in the last 30 days · 7 in the last 24 hours
Weather
- Conditions
- Visual (VMC) · Day
- Wind
- 50° at 6 knots
- Visibility
- 6 statute miles
- Lowest ceiling
- None
- Temperature
- 81 °F, dew point 64 °F
- Altimeter
- 29.00 inHg
- Observed at
- PWA, 5 nm away
FAA reports on this event · 1
The FAA’s own accident and incident reports, matched to the aircraft by N-number and date.