- Date
- August 20, 1983, 10:05 local (17:05 UTC)
- Place
- Shaver Lake, CA
- Injuries
- 2 fatal
- Damage
- Destroyed
- Phase of flight
- Maneuvering
- Aircraft
- N190CHBoeing Vertol BV-107-II
- Weather
- Visual (VMC) · Day
- Status
- Completed
- Report
- Approved by Office Director
- FAA report
- 19830820074729A
- Case key
- 23494
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
The only witness, the hooker, who gets logs ready for transport by the helicopter, stated that he heard noises and the rotor blades began coming apart as the acft started downhill with a log. Examination of the wreckage revealed that #3 sychronizing shaft (Boeing p/n 10703141-13) had failed a fatigue crack originating at a rivet hole. The total time on the shaft was 17492 hours with 435 hours since overhaul. The quality of the surface finish on the rivet holes was considered unsatisfactory in a post accident laboratory evaluation. As a interim measure Boeing vertol arbitraily imposed a life of 8750 hours on all synchronizing shafts of this type. This was based on the life of this failed part. A program is also being developed to do a flt strain survey on a BV-107 for logging operations. The hooker stated that the log being lifted by the accident acft weighed between 8000 and 9000 pounds.
Aircraft
- Registration
- N190CH
- Reported as
- Boeing Vertol BV-107-II
- Category
- Helicopter
- Serial number
- 2002
- Airframe hours
- 2,392
- Engine
- GE CT 581401A, 1,500 horsepower, turbo shaft
- Damage
- Destroyed
- Flight
- Part 133
- Registered owner
- Columbia Helicopters Leasing
- Airworthiness certificate
- Standard, Normal
- Last inspection
- AAIP · August 18, 1983 · 8 hours before
- Departed
- Shaver Lake, CA
- Flight plan
- Company VFR
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
- Certificates
- Airline transport, Commercial
- Airplane ratings
- Single-engine land
- Instrument ratings
- Helicopter
- Medical
- Class 2, Valid Medical--no waivers/lim.
- Seat
- Left
- Toxicology
- Performed
- Flight hours
- 2,422 in this make and model
Weather
- Conditions
- Visual (VMC) · Day
- Wind
- 250° at 15 knots
- Visibility
- 50 statute miles
- Temperature
- 61 °F
- Observed at
- FAT, 35 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.