# NTSB SEA95LA080: Cessna 172L, N7011Q, Wheatland, WY, April 17, 1995 - Type: NTSB accident investigation - Classification: Accident · Minor injuries · Limited investigation · Final report - Date: April 16, 1995, 22:30 local (Apr 17, 1995, 04:30 UTC) - Place: Wheatland, WY - Coordinates: 42.049514, -104.949935 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=42.0495&lon=-104.9499&mi=10 - Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping) - Highest injury: Minor injuries - Injuries: 2 minor - Status: Completed, report January 29, 1996 - Report: Approved by Office Director - NTSB case key (mKey): 42135 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=SEA95LA080 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/42135/pdf - Page: https://openairdocs.org/ntsb/SEA95LA080 ## Probable cause THE PILOT'S CONTINUED FLIGHT INTO KNOWN ADVERSE WEATHER CONDITIONS. A FACTOR IN THE ACCIDENT WAS THE AIRFRAME ICING ENCOUNTERED DURING THE FLIGHT. ## Analysis THE PILOT WAS ADVISED OF FORECAST OCCASIONAL MODERATE RIME ICING IN CLOUDS AND PRECIPITATION FROM THE FREEZING LEVEL TO 12000 FEET. EN ROUTE TO HIS DESTINATION, THE PILOT ENCOUNTERED AIRFRAME ICING CONDITIONS. AS THE AIRPLANE ICED UP, THE PILOT WAS UNABLE TO MAINTAIN LEVEL FLIGHT. ATC VECTORED THE PILOT TOWARDS WHEATLAND AIRPORT BEFORE HE LOST RADIO CONTACT. THE AIRPLANE CONTINUED DESCENDING UNTIL IT COLLIDED WITH TERRAIN IN ZERO VISIBILITY AND NOSED OVER. THE ELT FUNCTIONED AND THE PILOT AND HIS PASSENGER WERE RESCUED THE FOLLOWING MORNING. ## Factual narrative On April 16, 1995, approximately 2230 mountain daylight time (MDT), a Cessna 172L, N7011Q, impacted the terrain during a forced landing near Wheatland, Wyoming. The commercial pilot and his wife received minor injuries, and the aircraft sustained substantial damage. The personal pleasure flight, which departed Montrose County Airport, Montrose, Colorado, approximately 1830, was being operated in instrument meteorological conditions at the time of the accident. The pilot was operating on an IFR flight plan. The ELT actuated and assisted in the location of the crash site. According to Denver Center personnel, the pilot reported he had entered icing conditions and was unable to maintain altitude. The pilot stated that he encountered icing conditions about two- thirds into his flight. He advised Denver Center the he was unable to maintain altitude and that he was losing about 200-300 feet per minute and he needed the closest possible airport. Center turned the aircraft three or four times to different destination airports, but each time, after a few minutes on course, advised the pilot that he would be unable to make it to the destination. Center then turned the aircraft toward Wheatland airport and advised that the runway lights had been turned on. The pilot stated that shortly after that he lost communications with Center. He stated that with zero visibility the right main landing gear struck the ground. He then closed the throttle and tried to reduce speed. He stated that due to the ice on the left wing, he was unable to keep the left wing up and the left wing tip struck the ground. The aircraft then nosed over. The pilot and his wife were located and rescued about 0645 the following morning. During his weather briefing, the pilot had been advised of occasional moderate rime icing in clouds and precipitation from freezing level to 12,000 feet along his route of flight. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - In flight encounter with weather, cruise - weather condition - icing conditions (contributing factor) - flight into known adverse weather - continued, pilot in command (cause) - In flight collision with terrain/water, descent - wing - ice (contributing factor) ## Aircraft - Registration: [N7011Q](https://openairdocs.org/deregistered/N7011Q-2013-10-31), registration cancelled 2013-10-31, S/N 17260311, built 1971 (OpenAirDocs) - Reported make and model: CESSNA 172L - Registry model: [Cessna 172L](https://openairdocs.org/model/cessna-172l) (registry code 2072432) (OpenAirDocs) - Registry engine: [Lycoming 0-320 series](https://openairdocs.org/engine/lycoming-0-320-series) (registry code 41508, reciprocating) (OpenAirDocs) - Category: Airplane - Serial number: 17260311 - Engines: LYCOMING O-320-E2D 150 horsepower reciprocating - Damage: Substantial damage - Flight: Personal, Part 91 - Registered owner: Ham, Michael T. - Airworthiness certificate: Standard, Normal - Last inspection: Annual, April 15, 1994, 60 hours before - Departed: MTJ, MONTROSE, CO - Destination: CYS, CHEYENNE, WY - Flight plan: IFR ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 39; commercial; airplane ratings: single-engine land; instrument ratings: airplane; medical: class 2, valid medical--no waivers/lim.; seat: left; flight hours: 439 total, 71 in this make and model, 390 as pilot in command, 70 in the last 90 days, 47 in the last 30 days, 4 in the last 24 hours ## Weather - Conditions: Instrument (IMC), Night/dark - Wind: 110° at 10 knots - Visibility: 10 statute miles - Lowest ceiling: 800 ft overcast - Temperature: 30 °F, dew point 28 °F - Altimeter: 29.00 inHg - Observed at: LAR, 40 nm away From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date; 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.