# NTSB FTW98LA091: Cessna 152, N757CH, Boyd, TX, January 9, 1998 - Type: NTSB accident investigation - Classification: Accident · Minor injuries · Limited investigation · Final report - Date: January 9, 1998, 12:45 local (18:45 UTC) - Place: Boyd, TX - Coordinates: 33.079673, -97.560684 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=33.0797&lon=-97.5607&mi=10 - Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping) - Highest injury: Minor injuries - Injuries: 2 minor - Status: Completed, report December 8, 1998 - Report: Approved by Office Director - NTSB case key (mKey): 20514 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=FTW98LA091 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/20514/pdf - Page: https://openairdocs.org/ntsb/FTW98LA091 ## Probable cause loss of engine power resulting from the pilot's delayed use of carburetor heat during serious carburetor icing conditions. Factors were: the lack of suitable terrain for the forced landing and an evasive maneuver which led to an inadvertent stall. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - Loss of engine power, descent - normal - weather condition - carburetor icing conditions (contributing factor) - fuel system,carburetor - ice (cause) - carburetor heat - delayed, pilot in command (cause) - Forced landing, emergency descent/landing - In flight collision with terrain/water, landing - flare/touchdown - terrain condition - none suitable (contributing factor) - terrain condition - rough/uneven - object - wire,transmission - object - fence - maneuver to avoid obstructions - intentional, pilot in command (contributing factor) - stall - inadvertent, pilot in command ## Analysis The instrument student was practicing standard rate (500 fpm) descents and climbs, and the flight had descended with the power at 2,000 RPM from 3,000 feet MSL to 1,500 feet MSL. When the student applied full throttle for the climb, the engine power did not increase. The flight instructor took the flight controls and applied carburetor heat; however, the power decreased through 1,500 RPM to 1,200 RPM. The field selected for the forced landing was rough and the airplane struck the ground and again became airborne. The flight instructor, observing a powerline and fence ahead of the airplane, flew the airplane under the powerline and over the fence. Subsequently, the airplane 'stalled' and impacted the ground. The NWS reported the temperature was 46.4 degrees Fahrenheit with a dew point of 39.2 degrees Fahrenheit and a relative humidity of 61 per cent. The icing probability curves showed the conditions to be favorable for serious carburetor icing. ## Factual narrative On January 9, 1998, at 1245 central standard time, a Cessna 152, N757CH, impacted terrain during a forced landing following a loss of engine power near Boyd, Texas. The airplane was operated by Bourn Ammenson Aviation, Inc., Fort Worth, Texas, under Title 14 CFR Part 91. The private pilot/instrument student and the commercial pilot/flight instructor received minor injuries, and the airplane sustained substantial damage. Visual meteorological conditions prevailed and a flight plan was not filed for the local instructional flight that departed Hicks Airfield at 1230. During personal interviews, conducted by the investigator-in-charge, and on the Pilot/Operator Aircraft Accident Report (NTSB Form 6120.1/2), the flight instructor and instrument student reported that the student was practicing standard rate (500 fpm) descents and climbs. The flight descended with the power at 2,000 RPM from 3,000 feet MSL to 1,500 feet MSL, and the instrument student applied full throttle for the climb; however, the engine power did not increase. The flight instructor took the flight controls and applied carburetor heat and performed the emergency checklist; however, the power decreased through 1,500 RPM to 1,200 RPM. At a descent rate of 200 fpm, the flight instructor selected a field which "appeared to be suitable for the landing." However, the field was rough and the airplane struck the ground and again became airborne. The flight instructor, observing a powerline and fence ahead of the airplane, flew the airplane under the powerline and over the fence. Subsequently, the airplane "stalled" as it approached a hill. The left wing and the nose gear struck the ground, and the airplane came to rest inverted. The left wing, vertical stabilizer, and rudder sustained damage. The flight instructor reported the temperature at 55 degrees Fahrenheit with a dew point of 40 degrees Fahrenheit. The National Weather Service (METAR) observation at 1253 for the Alliance Airport (14 miles east of the accident site) reported the temperature at 46.4 degrees Fahrenheit with a dew point of 39.2 degrees Fahrenheit and a relative humidity of 61 per cent. The icing probability curves showed the conditions to be favorable for serious carburetor icing. ## Aircraft - Registration: [N757CH](https://openairdocs.org/deregistered/N757CH-2017-02-28), registration cancelled 2017-02-28, S/N 15279629, built 1977 (OpenAirDocs) - Reported make and model: Cessna 152 - Registry model: [Cessna 152](https://openairdocs.org/model/cessna-152) (registry code 2071835) (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: 15279629 - Airframe hours: 7483 - Engines: Lycoming O-235-L2C 110 horsepower reciprocating - Damage: Substantial damage - Flight: Instructional, Part 91 - Registered owner: Bourn Ammenson Aviation, Inc. - Airworthiness certificate: Standard, Normal - Last inspection: 100 hour, December 30, 1997 - Departed: T67, FORT WORTH, TX ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 25; commercial; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: class 1, valid medical--no waivers/lim.; seat: right; flight hours: 1,300 total, 700 in this make and model, 1,250 as pilot in command, 90 in the last 90 days, 30 in the last 30 days, 5 in the last 24 hours ## Weather - Conditions: Visual (VMC), Day - Wind: 170° at 14 knots, gusting 17 - Visibility: 10 statute miles - Lowest ceiling: 3,000 ft broken - Temperature: 46 °F, dew point 39 °F - Observed at: AFW, 14 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 19980109000239A](https://openairdocs.org/incident/19980109000239A), Jan 9, 1998: Cessna 152, Boyd, TX, Substantial damage. Loss of power on descent. Bounced and stalled on rough field landing. Possible carb icing conditions. (.4)the instrument student was practicing standard rate… 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.