- Date
- June 1, 1988, 19:00 local (23:00 UTC)
- Place
- Callahan, FL
- Injuries
- 1 uninjured
- Damage
- Substantial damage
- Phase of flight
- Maneuvering
- Aircraft
- N9080TContinental Copters MK6B
- Weather
- Visual (VMC) · Day
- Status
- Completed · report July 21, 1989
- Report
- Approved by Office Director
- FAA report
- 19880601060419A
- Case key
- 32189
From the NTSB’s public API. By law, NTSB reports can’t be used as evidence in lawsuits over the accident.
On this page
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
While maneuvering the helicopter during an aerial application flt the eng quit. During the autorotative landing the helicopter landed hard. Examination of the eng revealed the accessory drive gear, which is attached to the crankshaft by 6 AN-4A bolts with the torque transmitted to the gear through 3 press-fit dowel pins, separated when the bolts failed due to fatigue, resulting in the total loss of eng power. There was no evidence that the dowel pins were installed. According to the eng manufacturer, the dowel pins are the principal torque carrying mechanism of the accessory drive gear.
Aircraft
- Registration
- N9080T
- Reported as
- Continental Copters MK6B
- Category
- Helicopter
- Serial number
- CCI-76-4
- Airframe hours
- 5,500
- Engine
- Lycoming VO-435-B1A, 265 horsepower, reciprocating
- Damage
- Substantial damage
- Flight
- Aerial application · Part 137
- Registered owner
- Cecil G. Register
- Airworthiness certificate
- Special, Restricted (Special)
- Last inspection
- Annual · June 8, 1987 · 580 hours before
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
- 36
- Certificate
- Commercial
- Airplane ratings
- Single-engine land
- Medical
- Class 2, Valid Medical--no waivers/lim.
- Seat
- Center
- Flight hours
- 10,000 total · 9,000 in this make and model · 9,500 as pilot in command · 110 in the last 90 days · 25 in the last 30 days · 5 in the last 24 hours
Weather
- Conditions
- Visual (VMC) · Day
- Wind
- 130° at 5 knots
- Visibility
- 6 statute miles
- Lowest ceiling
- None
- Temperature
- 77 °F, dew point 66 °F
- Altimeter
- 29.00 inHg
- Observed at
- CRG, 19 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.
Other investigations on N9080T · 2
Matched to the same aircraft by N-number and date.