- Date
- April 7, 1998, 11:55 local (17:55 UTC)
- Place
- Riverton, WY
- Injuries
- 1 serious, 1 minor, 2 uninjured
- Damage
- Destroyed
- Phase of flight
- Enroute
- Aircraft
- N4728FCessna P206B
- Weather
- Instrument (IMC) · Day
- Status
- Completed · report October 30, 1998
- Report
- Approved by Office Director
- FAA report
- 19980407011359A
- Case key
- 20573
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
continued flight by the pilot into instrument meteorological conditions (IMC), and his failure to maintain sufficient altitude from terrain, while manuevering to reverse direction. Related factors were: the adverse weather conditions, mountainous terrain, and the pilot's lack of instrument experience.
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 pilot obtained a weather briefing before departing on a flight from Rock Springs, WY, to Broadus, MT. He was told that Gillette, WY, and Billings, MT, were reporting instrument meteorological conditions (IMC), and that no weather was available for Riverton, WY. Since visual meteorological conditons (VMC) prevailed at Rock Springs, he made a decision to takeoff and assess the weather en route. While in cruise flight, the aircraft penetrated a line of light drizzle and snow showers. While attempting to reverse direction, the airplane collided with terrain.
Factual narrative
On April 7, 1998, approximately 1155 mountain daylight time, a Cessna P206B, N4728F, was substantially damaged when it collided with terrain while maneuvering to reverse direction 19 miles southeast of Riverton, Wyoming. The commercial pilot was seriously injured, one passenger sustained minor injuries, and two passengers were not injured. Instrument meteorological conditions prevailed, and no flight plan was filed for the personal flight being conducted under Title 14 CFR Part 91. The flight originated at Rock Springs, Wyoming, approximately 30 minutes prior to the accident.
The following is based on the accident report submitted by the pilot. He and his passengers had flown from Utah and landed at Rock Springs, Wyoming. He obtained a weather briefing and was told that Gillette, Wyoming, and Billings, Montana, were reporting instrument meteorological conditions, and no weather was available for Riverton, Wyoming. Since visual meteorological conditions prevailed at Rock Springs, he made the decision to proceed and assess the weather en route.
While in cruise flight, the aircraft penetrated a line of light drizzle and snow showers. The pilot noticed "what appeared to be a limitation to forward visibility" ahead of him, but due to the flat light (sic) conditions, he underestimated his distance from the terrain. As a result, he did not slow the airplane down from cruise speed in enough time, and subsequently lost visual references for approximately 20 to 30 seconds. After he had regained visual conditions, he attempted to slow the aircraft down and turn 180 degrees, following a return course on his Global Positioning System. As he established himself on the course, he noticed a hill in front of their path and began to turn away from it to the left. In an attempt to shorten his turn, he added flaps. The left lower wing struck a rise in the terrain, and the airplane impacted the ground. In his accident report, the pilot said that there was 1 mile visibility, a broken ceiling between 500 to 1,000 feet, and moderate snow showers.
The left wing was torn off, and there was damage to the engine, the right wing, the nacelle, landing gear, and fuselage.
Aircraft
- Registration
- N4728F
- Reported as
- Cessna P206B
- Category
- Airplane
- Serial number
- P2060328
- Airframe hours
- 6,251
- Engine
- Continental I0-520, 285 horsepower, reciprocating
- Damage
- Destroyed
- Flight
- Personal · Part 91
- Registered owner
- Jeffrey G. Wash
- Airworthiness certificate
- Standard, Normal
- Last inspection
- Annual · June 10, 1997
- Departed
- RKS · Rock Springs, WY
- Destination
- BDX · Broadus, MT
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
- 37
- Certificate
- Commercial
- Airplane ratings
- Single-engine land
- Medical
- Class 2, Valid Medical--no waivers/lim.
- Seat
- Left
- Flight hours
- 3,200 total · 1,500 in this make and model · 3,100 as pilot in command · 19 in the last 90 days · 17 in the last 30 days · 5 in the last 24 hours
Weather
- Conditions
- Instrument (IMC) · Day
- Wind
- 250° at 7 knots
- Visibility
- 30 statute miles
- Lowest ceiling
- 3,700 ft broken
- Temperature
- 59 °F, dew point 41 °F
- Altimeter
- 30.00 inHg
- Observed at
- RIV, 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.