# NTSB FTW96LA068: Aviat A-1, N236CD, Collinsville, OK, December 2, 1995 - Type: NTSB accident investigation - Classification: Accident · Minor injuries · Limited investigation · Final report - Date: December 2, 1995, 14:00 local (20:00 UTC) - Place: Collinsville, OK - Coordinates: 36.369663, -95.849525 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=36.3697&lon=-95.8495&mi=10 - Phase of flight: [Approach](https://openairdocs.org/ntsb-phases/500) (OpenAirDocs' grouping) - Highest injury: Minor injuries - Injuries: 1 minor - Status: Completed, report May 17, 1996 - Report: Approved by Office Director - NTSB case key (mKey): 19725 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=FTW96LA068 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/19725/pdf - Page: https://openairdocs.org/ntsb/FTW96LA068 ## Probable cause The pilot's improper planning/decision, his failure to periodically clear the engine during the glide, and failure to see-and-avoid the transmission line during the approach for an emergency landing. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - Loss of engine power(total) - nonmechanical, approach - planning/decision - inadequate, pilot in command (cause) - weather condition - carburetor icing conditions - carburetor heat - selected, pilot in command - powerplant controls - improper use of, pilot in command (cause) - Forced landing, emergency descent/landing - In flight collision with object, emergency landing - object - wire,transmission - clearance - not maintained, pilot in command (cause) - In flight collision with terrain/water, emergency landing ## Analysis The pilot reported that while approaching his private airstrip to land, he reduced the engine power to idle, 'pulled on the carburetor heat,' and glided for 3 to 5 minutes. He also reported that he never 'cleared his engine' during this glide. Subsequently, he realized the approach would be 'short' and that additional power would be needed to reach the airstrip. He moved the throttle forward, but there was no increased power response. The pilot further stated that the airplane was very low to the ground, and there was not enough room to maneuver. During a forced landing, the airplane impacted transmission wires and then the ground. The temperature and dew point were 75 and 53 degrees, respectively. According to icing probability charts, conditions were favorable for carburetor ice. ## Factual narrative On December 2, 1995, at 1400 central standard time, an Aviat A-1, N236CD, registered to and operated by a private owner under Title 14 CFR Part 91 was substantially damaged during a forced landing following a power loss near Collinsville, Oklahoma. The private pilot sustained minor injuries. Visual meteorological conditions prevailed for the cross country flight that originated at Vinita, Oklahoma, approximately 45 minutes before the accident. No flight plan was filed. The pilot reported in his Pilot/Operator Report and during a telephonic interview with the investigator-in-charge that he was approaching his private airstrip to land. He reduced the engine power to idle, pulled on the carburetor heat, and glided for 3 to 5 minutes during the approach for landing (the pilot reported that he never "cleared his engine" during this glide). He realized that he was "short", and needed power to make the airstrip. He moved the throttle forward and there was no increased power response. The pilot further stated that he was very low to the ground and had no room to maneuver. During the forced landing, the airplane impacted transmission wires and the ground. Evaluation of the weather, at the time of the accident, revealed a temperature of 75 degrees and dew point of 53 degrees. The enclosed icing probability curve chart indicates that this float type carbureted engine was being operated in a region of serious carburetor icing conditions. ## Aircraft - Registration: [N236CD](https://openairdocs.org/aircraft/N236CD), registered now, S/N 1219, built 1992 (OpenAirDocs) - Reported make and model: AVIAT A-1 - Registry model: [Aviat A-1](https://openairdocs.org/model/aviat-a-1) (registry code 2210302) (OpenAirDocs) - Registry engine: [Lycoming 0-360-A1D](https://openairdocs.org/engine/lycoming-0-360-a1d) (registry code 41504, reciprocating) (OpenAirDocs) - Category: Airplane - Serial number: 1219 - Airframe hours: 134 - Engines: Lycoming O-360-C1G 180 horsepower reciprocating - Damage: Substantial damage - Flight: Personal, Part 91 - Registered owner: Harry R. Humphrey - Airworthiness certificate: Standard, Normal - Last inspection: Annual, October 15, 1994, 25 hours before - Departed: HO4, VINITA, OK ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 70; commercial, private, flight engineer; airplane ratings: single-engine land; medical: unknown, expired; seat: front; flight hours: 5,000 total, 3 in the last 90 days, 2 in the last 30 days, 1 in the last 24 hours ## Weather - Conditions: Visual (VMC), Day - Wind: 210° at 20 knots, gusting 25 - Visibility: 10 statute miles - Lowest ceiling: none - Temperature: 75 °F, dew point 54 °F - Altimeter: 29.00 inHg - Observed at: TUL, 18 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 19951202039479A](https://openairdocs.org/incident/19951202039479A), Dec 2, 1995: Chris A1, Collinsville, OK, Substantial damage. Failed to clear engine on glide to Private strip. Used carb heat after idling engine. Struck power line short. 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.