DEN05LA017

NTSB accident investigation · Miller Vans RV4 · Dotsero, CO · October 31, 2004

Accident · Serious injuriesLimited investigationFinal report
Date
October 31, 2004, 15:45 local (22:45 UTC)
Place
Dotsero, CO
Injuries
2 serious
Damage
Destroyed
Phase of flight
Enroute
Aircraft
N25HMMiller Vans RV4
Weather
Visual (VMC) · Day
Status
Completed · report March 30, 2005
Report
Approved by Office Director
Parties
Federal Aviation Administration
FAA report
20041031028859A
Case key
60484

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 pilot's improper in-flight planning and decision making and the loss of engine power due to carburetor ice. Contributing factors include the weather conditions conducive for carburetor icing and the lack of suitable terrain for a forced landing.

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.

Loss of engine power(total) - nonmechanicalCruise
In-flight planning/decision - improperPilot in commandCause
Weather condition - carburetor icing conditionsFactor
Fuel system,carburetor - iceCause
Forced landingEmergency descent/landing
In flight collision with objectDescent - emergency
Object - tree(s)
In flight collision with terrain/waterDescent - uncontrolled
Terrain condition - none suitableFactor

Analysis

According to the pilot, he did not file a flight plan for the flight stating that he wanted to "retain flexibility of refuel locations, based on observed weather patterns while en route." He stated that the en route weather conditions were known to be "VNR [visual flight rules not recommended] due to mountain obscuration and icing in clouds." The pilot stated that he opted for a "VFR over the top flight," while receiving en route weather updates. The departure was uneventful. At approximately 45 minutes in to the flight, the engine "failed." The pilot stated "no icing conditions were encountered." He "declared [an] emergency," and began to "search for holes," as the airplane descended into instrument meteorological conditions (IMC) conditions. The airplane "broke out" of IMC, into poor visibility conditions, at approximately 1500 to 2000 feet agl. The pilot attempted to restart the engine, but the "propeller seized" while he was on a base turn for an attempted forced landing to a road. The airplane struck the top of several aspen trees, impacted the ground in a level attitude and nosed over. A post-impact fire destroyed the airplane. The local recorded weather conditions, temperature, minus 1 degree C; dew point, minus 2 degrees C, were conducive for "serious carburetor icing affects at glide and cruise power settings." During an examination, engine continuity was confirmed and no anomalies were noted that would have precluded normal engine operation.

Factual narrative

On October 31, 2004, at approximately 1545 mountain standard time, a Miller Vans RV4 homebuilt airplane, N25HM, piloted by a commercial pilot, was destroyed when it impacted mountainous terrain following a loss of engine power near Dotsero, Colorado. Visual meteorological conditions prevailed at the time of the accident. The personal cross-country flight was being conducted under the provisions of Title 14 CFR Part 91 without a flight plan. The pilot and passenger received serious injuries. The flight originated at Vernal, Utah, at approximately 1500.

According to the pilot, the flight began at Morgan, Utah, at approximately 1330, with a destination of Colorado Springs, Colorado. The pilot did not file a flight plan for the flight and stated that he wanted to "retain flexibility of refuel locations, based on observed weather patterns while en route." He made a fuel stop at Vernal, Utah, and the departure from Vernal was uneventful. He stated that the weather conditions between Morgan and Colorado Springs were known to be "VNR [visual flight rules not recommended] due to mountain obscuration and icing in clouds." The pilot stated that he opted for a "VFR over the top flight," while receiving en route weather updates.

At approximately 45 minutes in to the second leg of the flight, the engine "failed." The pilot stated "no icing conditions were encountered." The pilot stated that he "declared [an] emergency," and began to "search for holes," as the airplane descended into Instrument meteorological conditions (IMC). The airplane "broke out of IMC, into poor visibility conditions," at approximately 1500 to 2000 feet agl.

The pilot stated that he attempted to restart the engine throughout the descent, but the "propeller seized" while he was on a base turn for an attempted forced landing to a fire road. The airplane struck the top of several aspen trees, impacted the ground in a level attitude and nosed over. A post impact fire destroyed the airplane.

At 1535, the recorded weather conditions at Eagle County Regional Airport (EGE), Eagle Colorado, (approximately 24 nautical miles at 090 degrees) was, wind, 000 degrees at 0 knots; visibility, 7 statute miles; sky condition, scattered at 100 feet, overcast at 1,600 feet; temperature, minus 1 degree C; dew point, minus 2 degrees C; altimeter setting, 29.88. The calculated density altitude was 6,211 feet msl. According to the recorded data, the local weather conditions were conducive for "serious carburetor icing affects at glide and cruise power settings."

Both propeller blades showed leading edge chordwise scratches. During an examination, engine continuity was confirmed and no anomalies were noted that would have precluded normal engine operation.

Aircraft

Registration
N25HM
Reported as
Miller Vans RV4
Category
Airplane, amateur-built
Serial number
1809
Airframe hours
505
Engine
Lycoming O-320E2D, 150 hp, reciprocating
Damage
Destroyed
Fire
On-Ground
Flight
Personal · Part 91
Registered owner
Ryan Dahlin
Airworthiness certificate
Special, Experimental (Special)
Last inspection
Annual · April 1, 2004 · 150 hours before
Departed
VEL · Vernal, UT
Destination
COS · Colorado Spring, CO

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
30
Injuries
Serious
Certificates
Private, Recreational
Airplane ratings
Single-engine land, Multi-engine land
Instrument ratings
Helicopter, Airplane
Medical
Class 2, Valid Medical--w/ waivers/lim
Last flight review
May 5, 2004
Seat
Front
Flight hours
1,281 total · 176 in this make and model · 720 as pilot in command · 115 in the last 90 days · 31 in the last 30 days · 2 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
0° at 0 knots
Visibility
7 statute miles
Lowest ceiling
5 ft broken
Temperature
30 °F, dew point 28 °F
Altimeter
29.87 inHg
Observed at
KEGE, 24 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.