# NTSB LAX98LA125: Cessna 150G, N2952J, Sonoma, CA, March 26, 1998 - Type: NTSB accident investigation - Classification: Accident · Serious injuries · Limited investigation · Final report - Date: March 25, 1998, 16:15 local (Mar 26, 1998, 00:15 UTC) - Place: Sonoma, CA - Coordinates: 38.24023, -122.460311 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=38.2402&lon=-122.4603&mi=10 - Phase of flight: [Initial climb](https://openairdocs.org/ntsb-phases/350) (OpenAirDocs' grouping) - Highest injury: Serious injuries - Injuries: 1 serious, 1 minor - Status: Completed, report February 15, 2001 - Report: Approved by Office Director - NTSB case key (mKey): 30058 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=LAX98LA125 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/30058/pdf - Page: https://openairdocs.org/ntsb/LAX98LA125 ## Probable cause The instructor pilot's inadequate in-flight planning/decision and subsequent inadequate supervision of the situation to simulate an engine failure on takeoff, as well as both pilot's not maintaining a visual lookout. A related factor was the diverted attention of both the instructor and student pilot's. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - Loss of engine power, takeoff - initial climb - in-flight planning/decision - inadequate, pilot in command(cfi) (cause) - engine shutdown - intentional, pilot in command(cfi) (cause) - In flight collision with object, maneuvering - object - wire,transmission - maneuver to avoid obstructions - attempted, pilot in command(cfi) - diverted attention, pilot in command(cfi) (contributing factor) - visual lookout - not maintained, pilot in command(cfi) (cause) - supervision - inadequate, pilot in command(cfi) (cause) - In flight collision with terrain/water, descent - uncontrolled - terrain condition - ground ## Analysis The instructor pilot and student pilot were preparing for the student pilot's private pilot check ride. Both pilot's remember practicing maneuvers for 40 minutes before returning to the airport to practice soft and short field takeoff's and landings. On the landing preceding the accident takeoff the instructor simulated an engine failure and the student landed without any difficulty. On the accident takeoff the student pilot raised the flaps and the instructor simultaneously leaned the mixture to simulate a power loss. The instructor took over on the controls when the student did not recognize the situation. He attempted a restart of the engine, while the student flew the aircraft to an open field. While attempting to restart the engine the instructor observed a power line and instructed the student to fly underneath the power line. Both pilot's stated that on the last attempt to restart the engine, it started. They both looked up and saw power lines and attempted to maneuver the aircraft underneath the power lines. The student pilot stated that his instructor did not indicate to him that he was going to simulate an engine failure. ## Factual narrative On March 25, 1998, at 1615 hours Pacific standard time a Cessna 150G, N2952J, lost engine power after takeoff, struck power lines, and came to rest inverted in the back yard of a residence near the Sonoma Sky Park, Sonoma, California. The aircraft sustained substantial damage. The commercial rated flight instructor pilot/owner received serious injuries, and the student pilot received minor injuries. Visual meteorological conditions existed for the local instructional flight and no flight plan was filed. The student pilot reported that he was preparing for his private pilot check ride and had asked his flight instructor to practice flight maneuvers with him. The student pilot reported that they flew for approximately 40 minutes and returned to the airport to practice soft and short field takeoff's and landings. On the landing preceding the accident takeoff the instructor simulated an engine failure and the student landed without incident. The student pilot stated that they taxied back to runway 26 for a soft field takeoff. Approximately 200 feet above ground level (agl) the student raised the flaps. He reported that at this time the instructor leaned the mixture. The engine stopped and both pilot's attempted to restart the engine. The student pilot stated that on the last attempt the engine "caught" and they both looked up and saw power lines and attempted to maneuver the aircraft underneath the power lines. The student pilot reported feeling a big jerk and then a tumbling sensation. In a telephone interview, the student pilot reported that a couple of days after the accident he had an opportunity to speak to the instructor. The instructor informed him that the reason he had leaned the mixture was to simulate an engine failure on takeoff. The student pilot stated that his instructor did not indicate to him that he was going to simulate an engine failure. In the instructor's written statement to the Safety Board he reported that at approximately 400 feet agl he initiated a simulated emergency. He stated that when the student did not lower the nose he took over the controls, lowered the nose and enriched the mixture. The instructor pilot reported that the engine was "slowly wind milling and did not restart." He attempted a restart of the engine, while the student flew the aircraft to an open field. The instructor reported that after repeated attempts to restart the engine, he observed a power line in their flight path and instructed the student to fly underneath it. The instructor stated that they did not see the telephone and cable lines underneath the power lines until it was too late. The instructor believed that the engine restarted at the same time they impacted the telephone and cable lines. An officer from the Sonoma County Sheriff's Department reported that a steel cable was wrapped around the propeller. This was verified by a Federal Aviation Administration (FAA) inspector from the Oakland, California, Flight Standards District Office who examined the aircraft on-scene The FAA inspector could not establish control continuity due to the aircraft being inverted. He did note that the belly of the aircraft was covered in oil to the tail cone and there was no evidence of a fuel spill. ## Aircraft - Registration: [N2952J](https://openairdocs.org/deregistered/N2952J-2000-03-10), registration cancelled 2000-03-10, S/N 15065752 (OpenAirDocs) - Reported make and model: Cessna 150G - Registry model: [Cessna 150G](https://openairdocs.org/model/cessna-150g) (registry code 2071816) (OpenAirDocs) - Category: Airplane - Serial number: 15065752 - Airframe hours: 3111 - Engines: Continental O-200-A reciprocating - Damage: Substantial damage - Flight: Instructional, Part 91 - Registered owner: John D. Carmichael - Airworthiness certificate: Standard, Normal - Last inspection: Annual, October 23, 1997, 67 hours before - Departed: 0Q3 - Airport: 0Q9, Sonoma Sky Park, runway 26, 2,480 × 40 ft, asphalt ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 57; commercial, flight instructor; airplane ratings: single-engine land, multi-engine land, single-engine sea; instrument ratings: airplane; medical: class 2, valid medical--w/ waivers/lim; flight hours: 7,686 total, 4,500 in this make and model, 7,411 as pilot in command ## Weather - Conditions: Visual (VMC), Day - Wind: variable at 6 knots - Visibility: 20 statute miles - Lowest ceiling: 8,000 ft broken - Temperature: 50 °F, dew point 48 °F - Altimeter: 29.00 inHg - Observed at: STS, 25 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 19980325009389A](https://openairdocs.org/incident/19980325009389A), Mar 25, 1998: Cessna 150G, Sonoma, CA, Substantial damage. (.4)The instructor pilot and student pilot were preparing for the student pilot's private pilot check ride. Both pilot's remember practicing maneuvers for 40… 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.