Aircraft Accident/Incident Report

Mosca, Colorado 81146
Thursday, August 3, 2006 9:25 MDT

NTSB Narrative Summary Released at Completion of Accident

A witness, located about two miles from the accident site, said he heard an approaching airplane. He said the engine was "sputtering, like it was missing." He did not see the airplane, but he did hear a loud "pop." He went to a clearing and saw a fire on the mountainside. He said the sky was overcast and the mountaintops were obscured. He estimated the point of impact to be 500 feet below the overcast. After the wreckage was recovered, the engine was disassembled and examined. No anomalies were noted. There was camshaft and crankshaft continuity, and all connecting rods were attached. The carburetor, which had separated from the engine, was examined. The bowl was empty, and the throttle valve was closed. Both the engine-driven and auxiliary fuel pumps were destroyed by fire. The Carburetor Icing Probability Chart was consulted. The temperature and dew point recorded at the nearest weather reporting station, 37 miles south of the accident site, were conducive to "serious icing at cruise power." The temperatures and dew points recorded at the point of departure and destination were conducive to "serious icing at glide power."

NTSB Probable Cause Narrative

a non-mechanical partial loss of engine power due to carburetor ice, and the pilot's failure to maintain clearance from terrain. Contributing factors in this accident were weather conditions conducive to carburetor icing and the pilot inadvertently flying into instrument meteorological conditions.

Event Information

Type of Event Accident
Event Date 8/3/2006
Event Day of the Week Thursday
Time of Event 925
Event Time Zone Mountain Daylight Time
Event City Mosca
Event State COLORADO
Event Country --
Zipcode of the event site 81146
Event Date Year 2006
Event Date Month 8
MidAir Collision Indicator No
On Ground Collision occurred ? No
Event Location Latitude 375117N
Event Location Longitude 1052763W
Event Location Airport --
Event Location Nearest Airport ID --
Indicates whether the acc/inc occurred off or on an airport Off Airport/Airstrip
Distance from airport in statute miles --
Degrees magnetic from airport --
Airport Elevation --
Weather Briefing Completeness --
Investigator's weather source Weather Observation Facility
Time of the weather observation 854 Mountain Daylight Time
Direction of event from weather observation facility (degrees) 360
Weather Observation Facility ID VTP
Elevation of weather observation facility 10116
Distance of event from weather observation facility (units?) 37
Time Zone of the weather observation MDT
Lighting Conditions Day
Lowest Ceiling Height 1100
Lowest Non-Ceiling Height --
Sky/Lowest/Cloud Conditions --
Sky Condition for Lowest Ceiling Broken
Visibility Runway Visual Range (Feet) --
Visibility Runway Visual Value (Statute Miles) --
Visibility (Statute Miles) 10
Air Temperature at event time (in degrees celsius) 15
Dew Point at event time (in degress fahrenheit) 8
Wind Direction (degrees magnetic) 90
Variable Wind Indicator Wind direction could be determined
Wind Speed (knots) 12
Wind Velocity Indicator --
Wind Gust Indicator Gusting
Wind Gust (knots) 20
Altimeter Setting at event time (in. Hg) 30.54
Density Altitude (feet) --
Intensity of Precipitation --
METAR weather report --
Event Highest Injury Fatal
On Ground, Fatal Injuries --
On Ground, Minor Injuries --
On Ground, Serious Injuries --
Injury Total Fatal 1
Injury Total Minor --
Injury Total None --
Injury Total Serious --
Injury Total All 1
Investigating Agency NTSB
NTSB Docket Number (internal use) 21146
NTSB Notification Source FAA-Northwest Mountain Region
NTSB Notification Date Aug 3 2006 12:00AM
NTSB Notification Time --
Fiche Number and/or location -used to find docket information DMS
Date of most recent change to record Mar 26 2007 9:33AM
User who most recently changed record NTSB\lema
Basic weather conditions Visual Meteorological Cond
FAA District Office Denver, Colorado

Aircraft Involved

Aircraft #1

Aircraft Registration Number N5416P
NTSB Number DEN06FA109
Missing Aircraft Indicator Y
Federal Aviation Reg. Part Part 91: General Aviation
Type of Flight Plan filed VFR
Flight plan Was Activated? No
Damage Destroyed
Aircraft Fire Ground
Aircraft Explosion Ground
Aircraft Manufacturer's Full Name Piper
Aircraft Model PA-24-180
Aircraft Series Identifier --
Aircraft Serial Number 24-270
Certified Max Gross Weight 2550
Aircraft Category Airplane
Aircraft Registration Class --
Aircraft is a homebuilt? No
Flight Crew Seats --
Cabin Crew Seats --
Passenger Seats --
Total number of seats on the aircraft 4
Number of Engines 1
Fixed gear or retractable gear Retractable
Aircraft, Type of Last Inspection Annual
Date of Last Inspection Oct 1 2005 12:00AM
Airframe hours since last inspection --
Airframe Hours 2909
ELT Installed Yes
ELT Activated No
ELT Aided Location of Event Site --
ELT Type --
Aircraft Owner Name Michael P. Davis
Aircraft Owner Street Address 40 Tierra Casa Dr.
Aircraft Owner City Pueblo
Aircraft Owner State CO
Aircraft Owner Country --
Aircraft Owner Zipcode 81005
Operator is an individual? No
Operator Name --
Operator Same as Owner? Yes
Operator Is Doing Business As --
Operator Address Same as Owner? Yes
Operator Street Address --
Operator City --
Operator State --
Operator Country --
Operator Zip code --
Operator Code --
Owner has at least one certificate None
Other Operator of large aircraft? --
Certified for Part 133 or 137 Operation --
Operator Certificate Number --
Indicates whether an air carrier operation was scheduled or not --
Indicates Domestic or International Flight --
Operator carrying Pax/Cargo/Mail --
Type of Flying (Per_Bus / Primary) Personal
Second Pilot on Board No
Departure Point Same as Event No
Departure Airport Code PUB
Departure City Pueblo
Departure State CO
Departure Country USA
Departure Time 837
Departure Time Zone MDT
Destination Same as Local Flt --
Destination Airport Code ALS
Destination City Alamosa
Destination State CO
Destination Country USA
Specific Phase of Flight Descent
Report sent to ICAO? --
Evacuation occurred --
Date of most recent change to record Mar 20 2007 4:57PM
User who most recently changed record NTSB\HAMG
Since inspection or accident Last Inspection
Event Location Runway Number and Location NA
Runway Length --
Runway Width --
Sight Seeing flight No
Air Medical Flight No
Medical Flight --