# NTSB DEN04LA110: American AA-1, N5667L, Guernsey, WY, July 25, 2004 - Type: NTSB accident investigation - Classification: Accident · Serious injuries · Limited investigation · Final report - Date: July 25, 2004, 10:30 local (16:30 UTC) - Place: Guernsey, WY - Coordinates: 42.250831, -104.717781 - Nearby events: https://openairdocs.org/map.md?lat=42.2508&lon=-104.7178&mi=10 - Phase of flight: [Initial climb](https://openairdocs.org/ntsb-phases/350) (OpenAirDocs' grouping) - Highest injury: Serious injuries - Injuries: 1 serious - Status: Completed, report June 8, 2005 - Report: Approved by Office Director - Parties: FAA Flight Standards Field Office - NTSB case key (mKey): 59732 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=DEN04LA110 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/59732/pdf - Page: https://openairdocs.org/ntsb/DEN04LA110 ## Probable cause the pilot's inadequate use of carburetor heat which resulted in the formation of carburetor ice and loss of engine power. Factors contributing to the accident were weather conditions conducive for carburetor icing, and a lack of suitable terrain for a forced landing. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - Loss of engine power, takeoff - initial climb - carburetor heat - inadequate, pilot in command (cause) - fuel system,carburetor - ice (cause) - weather condition - carburetor icing conditions (contributing factor) - Forced landing, descent - emergency - On ground/water encounter with terrain/water, emergency landing - terrain condition - none suitable (contributing factor) - terrain condition - high vegetation - object - fence ## Analysis According to the pilot, he just departed and was climbing. The pilot stated that the "engine started sputtering, and the tachometer went to 2200 rpm" and he was unable to maintain altitude. The pilot elected to land straight ahead due to "flatter" terrain. The airplane impacted a barbed wire fence and sage brush during the forced landing, causing substantial damage. The aviation routine weather report (METAR) reported the temperature as 77 degrees Fahrenheit (F) and the dewpoint was 54 degrees F. According to the Carburetor Icing Chart, these conditions are conducive for "serious icing at glide power." The contents of the airplane were weighed to calculate a weight and balance. The total weight of the airplane was calculated to be 1,580 pounds and the center of gravity was calculated to be 3 inches aft the most aft center of gravity limit. ## Factual narrative On July 25, 2004, at 1030 mountain daylight time, an American AA-1, N5667L, piloted by a private pilot, was destroyed when it impacted terrain during a forced landing near Camp Guernsey Airport (7V6), Guernsey, Wyoming. Visual meteorological conditions prevailed at the time of the accident. The personal flight was being conducted under the provisions of Title 14 CFR Part 91 without a flight plan. The pilot sustained serious injuries. The cross-country flight was originating at the time of the accident and was en route to Oshkosh, Wisconsin. According to the accident report submitted by the pilot, he had just departed from runway 14 and was climbing. The pilot stated that the "engine started sputtering, and the tachometer went to 2200 rpm" and he was unable to maintain altitude. The pilot elected to land straight ahead due to "flatter" terrain. The airplane impacted a barbed wire fence and sage brush during the forced landing, separating the nose gear and both wings. The engine mounts separated on the upper left side of the firewall, the propeller separated at the hub and then firewall buckled. The both wings were crushed aft longitudinally and separated from the fuselage, the canopy was crushed and fragmented and the cabin area was crushed in on the left side. According to the FAA inspector who traveled to the scene, the contents of the airplane were weighed to calculate a weight and balance. The total weight of the airplane was calculated to be 1,580 pounds and the center of gravity was calculated to be 3 inches aft the most aft center of gravity limit. On November 4, 2004, the engine was examined, under the auspices of the NTSB, in Greeley, Colorado. The engine was checked for continuity and compression and the magnetos were checked for spark. During a compression check, conditions consistent with lower compression were present in the #1 cylinder. According to the engine logbook, the airplane underwent an annual inspection on July 14, 2004. During the inspection, the cylinders produced the following compression: #1 66/80, #2 70/80, #3 78/80, and #4 78/80. The FAA inspector stated these results are within acceptable tolerances. The Torrington aviation routine weather report (METAR), 22 miles south east of Guernsey reported the temperature as 77 degrees Fahrenheit (F) and the dewpoint was 54 degrees F. According to the Carburetor Icing Chart, these conditions are conducive for "serious icing at glide power." ## Aircraft - Registration: [N5667L](https://openairdocs.org/deregistered/N5667L-2007-03-29), registration cancelled 2007-03-29, S/N AA1-0067, built 1969 (OpenAirDocs) - Reported make and model: American AA-1 - Registry model: [American AA-1](https://openairdocs.org/model/american-aa-1) (registry code 0630610) (OpenAirDocs) - Registry engine: [Lycoming 0-235 series](https://openairdocs.org/engine/lycoming-0-235-series) (registry code 41505, 4 cycle) (OpenAirDocs) - Category: Airplane - Serial number: AA1-0067 - Airframe hours: 2377.9 - Engines: Lycoming O-235-C2C 108 horsepower reciprocating - Damage: Destroyed - Flight: Personal, Part 91 - Airworthiness certificate: Standard, Normal - Last inspection: Annual, July 14, 2004, 11.6 hours before - Departed: 7V6, Guernsey, WY - Destination: OSH, OSHKOSH, WI - Airport: 7V6, Camp Guernsey, runway 14, 5,500 × 75 ft, asphalt ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 39; injuries: serious; private; airplane ratings: single-engine land; instrument ratings: airplane; medical: class 2, valid medical--w/ waivers/lim; last flight review February 14, 2004; seat: left; flight hours: 425 total, 100 in this make and model, 350 as pilot in command, 50 in the last 90 days, 25 in the last 30 days, 6 in the last 24 hours ## Weather - Conditions: Visual (VMC), Day - Wind: 130° at 12 knots - Visibility: 10 statute miles - Lowest ceiling: 3,300 ft broken - Temperature: 64 °F, dew point 54 °F - Altimeter: 30.34 inHg - Observed at: TOR, 28 nm away From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.