- Date
- November 29, 1989, 15:30 local (23:30 UTC)
- Place
- Raymond, WA
- Injuries
- 1 uninjured
- Damage
- Substantial damage
- Phase of flight
- Maneuvering
- Aircraft
- N9762CHiller UH-12E
- Weather
- Visual (VMC) · Day
- Status
- Completed · report June 26, 1992
- Report
- Approved by Office Director
- FAA report
- 19891129047839A
- Case key
- 41155
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
Loss of engine power due to fatigue failure of the impeller. The helicopter was substantially damaged as a result of a roll-over on uneven terrain.
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
During an external load operation, while hauling a load uphill to the landing zone, the pilot heard a loud noise and the engine began to lose power. The pilot released the load and autorotated to a landing on inclined terrain. While landing, the helicopter rolled over. During an engine teardown, a section of the impeller was found to have failed from fatigue, which resulted in additional damage to the engine and a loss of power.
Aircraft
- Registration
- N9762C
- Reported as
- Hiller UH-12E
- Category
- Helicopter
- Serial number
- 2159
- Airframe hours
- 8,066
- Engine
- Allison 250-C20B, 420 horsepower, turbo shaft
- Damage
- Substantial damage
- Flight
- Other work use · Part 133
- Operator
- Glacier Helicopters
- Registered owner
- Evergreen International
- Airworthiness certificate
- Standard, Normal
- Last inspection
- 100 hour · November 18, 1989 · 42 hours before
- Departed
- Raymond, WA
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
- 38
- Certificate
- Commercial
- Medical
- Class 2, Valid Medical--no waivers/lim.
- Seat
- Left
- Flight hours
- 3,293 total · 68 in this make and model · 2,475 as pilot in command · 68 in the last 90 days · 28 in the last 30 days · 2 in the last 24 hours
Weather
- Conditions
- Visual (VMC) · Day
- Wind
- 270° at 5 knots
- Visibility
- 15 statute miles
- Temperature
- 50 °F
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 N9762C · 3
Matched to the same aircraft by N-number and date.