# NTSB SEA96LA148: Mooney M18LA, N4077, Beaver Marsh, OR, July 9, 1996 - Type: NTSB accident investigation - Classification: Accident · Serious injuries · Limited investigation · Final report - Date: July 9, 1996, 12:41 local (19:41 UTC) - Place: Beaver Marsh, OR - Coordinates: 43.149211, -121.800041 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=43.1492&lon=-121.8000&mi=10 - Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping) - Highest injury: Serious injuries - Injuries: 1 serious - Status: Completed, report February 28, 1997 - Report: Approved by Office Director - NTSB case key (mKey): 42411 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=SEA96LA148 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/42411/pdf - Page: https://openairdocs.org/ntsb/SEA96LA148 ## Probable cause the loss of engine power for undetermined reason(s). A factor relating to the accident was: the presence of trees near the forced landing area. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - Loss of engine power, cruise - normal - reason for occurrence undetermined (cause) - Forced landing, emergency descent/landing - In flight collision with object, emergency landing - object - tree(s) (contributing factor) ## Analysis While cruising about 2000 feet agl, the engine began to lose power. The pilot attempted to make a forced landing on a road, but the airplane hit trees and crashed. Examination of the airplane by FAA inspectors did not reveal any mechanical discrepancy. ## Factual narrative On July 9, 1996, approximately 1241 Pacific daylight time, a Mooney M18LA, N4077, registered to Bryce Boylan, sustained substantial damage when it impacted terrain near Beaver Marsh, Oregon. The private pilot, the sole occupant was seriously injured. The 14 CFR 91 flight originated at Tulelake, California approximately 1130 and was en route to College Place, Washington. Visual meteorological conditions existed in the area. The pilot stated in a telephone interview that he had topped off both tanks in Tulelake and expected to have enough fuel to make it all the way to College Place. However, he planned on stopping in Redmond, Oregon, for fuel anyway. During the trip, he transferred fuel from the lower tank to the upper tank and the transfer pump seemed to be working normally. He was maintaining about 2000 feet above the ground level and about 90-95 miles per hour indicated airspeed. He was not using any carburetor heat. In the Beaver Creek area, about 78 nautical miles from the departure airport, the engine started slowing down. He attempted to transfer fuel using the transfer pump but wasn't sure it was working. After about 10-15 seconds the engine was windmilling, so the pilot attempted a landing on a road. The next thing he could recall was someone cutting him out of the wreckage. In the pilot's written accident report, he stated that "...it is my feeling that I ran out of gas..." and "...tanks were both filled before leaving Tulelake..." The salvage crew which picked up the aircraft about 6 hours after the accident found fuel running from the fuel tank and the ground was saturated with fuel. They also documented the wreckage location and two trees that had been damaged. Examination of the flight controls, engine, transfer pump and fuel system by FAA inspectors did not reveal any discrepancies. There were no weather observations taken in the Beaver Creek area. Weather conditions listed in this report came from Redmond, Oregon, about 75 miles north of the accident site. Using a lapse rate of 3 degrees Centigrade, the conditions there at 2000 feet above ground level would have been between "serious icing- descent power" and "moderate icing- cruise power" as listed on the Carburetor Icing chart published by Transport Canada. ## Aircraft - Registration: N4077 (not matched to a registry record) - Reported make and model: Mooney M18LA - Category: Airplane - Serial number: 119 - Engines: Lycoming O-145-B 65 horsepower reciprocating - Damage: Substantial damage - Flight: Personal, Part 91 - Registered owner: Bruce & Bryce Boylan - Airworthiness certificate: Standard, Normal - Last inspection: Annual, February 1, 1996, 2 hours before - Departed: 081, TULELAKE, CA - Destination: S95, COLLEGE PLACE, WA ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 72; private; airplane ratings: single-engine land; medical: class 3, valid medical--w/ waivers/lim; seat: center; flight hours: 300 total, 75 in this make and model, 275 as pilot in command, 10 in the last 90 days ## Weather - Conditions: Visual (VMC), Day - Wind: 20° at 5 knots - Visibility: 10 statute miles - Lowest ceiling: none - Temperature: 82 °F, dew point 41 °F - Altimeter: 30.00 inHg - Observed at: RDM, 75 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 19960709016179A](https://openairdocs.org/incident/19960709016179A), Jul 9, 1996: Mnmite M18LA, Beaver Marsh, OR, Substantial damage. Lost power. Struck trees landing on road. No anomalies. Fuel on board. Conditions good for carburetor icing. 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.