# NTSB IAD01LA056: Cessna 172N, N1674E, Ashland, ME, May 12, 2001 - Type: NTSB accident investigation - Classification: Accident · Minor injuries · Limited investigation · Final report - Date: May 12, 2001, 16:00 local (20:00 UTC) - Place: Ashland, ME - Location: 46.6169° N, 68.3928° W: Placed by OpenAirDocs: center of Ashland, ME, within about 6 miles (OpenAirDocs) - Nearby events: https://openairdocs.org/map.md?lat=46.6169&lon=-68.3928&mi=10 - Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping) - Highest injury: Minor injuries - Injuries: 1 minor - Status: Completed, report May 13, 2003 - Report: Approved by Office Director - NTSB case key (mKey): 53330 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=IAD01LA056 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/53330/pdf - Page: https://openairdocs.org/ntsb/IAD01LA056 ## Probable cause loss of partial engine power due to carburetor icing. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - Loss of engine power(partial) - nonmechanical, cruise - weather condition - carburetor icing conditions (contributing factor) - fuel system,carburetor - ice (cause) - Forced landing, descent - emergency - In flight collision with object, emergency descent/landing - object - tree(s) ## Analysis While on a fire patrol flight, the pilot encountered weather and decided to return to the airport. After initiating a turn towards the airport, the engine began to run rough and lose RPM. The pilot checked all pertinent systems and pulled the carburetor heat on, which had a limited effect. While looking for a suitable place to land, the engine power dropped from 2,000 rpm to 400-800 rpm, and the pilot landed on a logging road about 45 nautical miles west of Presque Isle, Maine. Examination of the airplane revealed there were no mechanical deficiencies, and fuel drained from the wing tanks and fuel sump was absent of debris and water. Interpolation of a carburetor icing probability chart revealed that conditions for moderate icing at cruise power and serious icing at glide power existed. ## Factual narrative On May 12, 2001, at 1600 eastern daylight time, a Cessna 172N, N1674E, was substantially damaged during a forced landing to wooded terrain near Ashland, Maine. The certificated commercial pilot sustained minor injuries. The flight originated from Caribou Regional Airport, Caribou, Maine. Visual meteorological conditions prevailed and no flight plan was filed for the fire patrol flight conducted under 14 CFR Part 91. In a written statement, the pilot reported that the airplane was refueled by the operator at 1430, and at 1500 he completed his pre-flight inspection. After completing all of the appropriate checklists, he departed at 1513. The pilot climbed to 600 feet agl and began his normal fire patrol route. After departing one of the checkpoints, he observed light rain showers ahead of him with visibility greater than 20 miles and cloud cover near 4,000 feet msl. He decided to return to Caribou due to the weather. After initiating a turn back toward Caribou, the engine began to lose rpm and run rough. The pilot checked the fuel selector valve, mixture, primer, and pulled the carburetor heat on, which had a "limited effect." However, he "suspected carburetor icing", and left the carburetor heat on. While looking for a suitable place to land, the pilot reported that the engine rpm dropped from 2,000 to 400-800. He was unable to maintain altitude and attempted to land on a logging road. The airplane came to rest in wooded terrain about 45 nautical miles west of Presque Isle, Maine. The operator responded to the scene and recovered the airplane. According to the operator, the fuselage was compromised, the firewall was wrinkled, and the engine mounts were broken. One of the propeller blades was bent aft. Both wings, the empennage and right horizontal stabilizer exhibited impact damage. Engine continuity was established by manual rotation of the propeller. The right wing fuel tank was breached, but the operator was able to drain 20-25 gallons of fuel from both wing tanks. He also reported that the fuel strainer bowl was filled with fuel. Fuel extracted from the wing tanks and fuel strainer bowl was absent of debris and water. The pilot reported a total of 518 flight hours, of which, 222 hours were in make and model. He also reported that there were no mechanical deficiencies. Weather at Presque Isle/Northern Maine Regional Airport, Presque Isle, Maine, at 1555, was reported as winds from 140 degrees at 11 knots gusting to 16 knots, visibility 10 statute miles, sky clear, temperature 73 degrees F, dewpoint 48 degrees C, and altimeter 29.72 inches HG. Interpolation of a carburetor icing probability chart revealed that conditions for moderate icing at cruise power and serious icing at glide power existed. ## Aircraft - Registration: [N1674E](https://openairdocs.org/deregistered/N1674E-2002-04-08), registration cancelled 2002-04-08, S/N 17271091, built 1978 (OpenAirDocs) - Reported make and model: Cessna 172N - Registry model: [Cessna 172N](https://openairdocs.org/model/cessna-172n) (registry code 2072434) (OpenAirDocs) - Registry engine: [Lycoming 0-320 series](https://openairdocs.org/engine/lycoming-0-320-series) (registry code 41508, reciprocating) (OpenAirDocs) - Category: Airplane - Serial number: 17271091 - Airframe hours: 5585.9 - Engines: Lycoming O-320-H2AD 180 horsepower reciprocating - Damage: Substantial damage - Flight: Aerial observation, Part 91 - Registered owner: Caribou Air Inc - Airworthiness certificate: Standard, Normal - Last inspection: Annual, August 25, 2000, 75.9 hours before - Departed: CAR, CARIBOU, ME ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 35; injuries: minor; flight instructor, commercial; airplane ratings: single-engine land; instrument ratings: airplane; medical: class 2, valid medical--w/ waivers/lim; last flight review May 1, 1999; seat: left; flight hours: 518 total, 222 in this make and model, 414 as pilot in command, 6 in the last 90 days, 6 in the last 30 days, 3 in the last 24 hours ## Weather - Conditions: Visual (VMC), Day - Wind: 140° at 11 knots, gusting 16 - Visibility: 10 statute miles - Lowest ceiling: none - Temperature: 75 °F, dew point 48 °F - Altimeter: 29.71 inHg - Observed at: PQI, 11 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 (OpenAirDocs). - [Accident 20010512034439A](https://openairdocs.org/incident/20010512034439A), May 12, 2001: Cessna 172N, Ashland, ME, No damage. (-23) The aircraft was being operated on a low altitude fire patrol for the Maine forest service under 14 CFR part 91. The pilot stated that he had refueled… ## Other investigations on N1674E (1) 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. - [NTSB CHI96LA227](https://openairdocs.org/ntsb/CHI96LA227), Jun 27, 1996: Cessna 172 (N1674E), Cottage Grove, WI, substantial damage. Probable cause: the pilot's failure to maintain directional control of the airplane during landing. A factor was the delayed go-around. 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.