NTSB CAROL · Event
Event LAX98LA147
Aircraft involved
Probable cause & findings
The pilot's loss of control in flight for undetermined reasons.
Factual narrative
On April 28, 1998, at 1315 hours mountain standard time, a Schweizer SGS-1-35, N34187, crashed after premature release of the tow rope and impacted a ditch. The glider sustained substantial damage, and the pilot/owner, the sole occupant, suffered serious injuries. Visual meteorological conditions prevailed for the local personal flight and no flight plan was filed. In a written statement from the pilot towing the glider, he reported that the takeoff and initial climb were normal. About 450 feet agl, the glider pilot moved out of position to the right, which caused the tow plane to yaw hard to the left. After bringing the glider back to the normal tow position, the glider veered rapidly to the right. The tow plane yawed hard to the left and the towrope snapped while at an altitude of approximately 700 feet agl. The tow pilot reported that it is their usual practice to release the towrope at 2,000 feet agl. The tow pilot then returned to the airport for landing. According to a Federal Aviation Administration (FAA) inspector from the Scottsdale, Arizona, Flight Standards District Office, witnesses reported that during takeoff they saw the glider veer to the right and saw the tow line break. As the glider pilot attempted to return to the airport to land, it impacted a ditch that ran between the two runways. Rescue workers reported that the pilot was incoherent and they suspected that he had suffered a stroke. One witness reported that the pilot had medical problems that prohibited him from flying more than 2 hours at a time. The pilot did not possess a medical certificate. FAA Regulation Part 61.103 states that a private pilot with a glider rating has only to "certify that he has no known medical defect that makes him unable to pilot a glider or free balloon, as appropriate." The pilot spent approximately 1 month in the hospital for various injuries inflicted from the accident. His wife reported that he has no memory of the accident. She also reported that she was unable to find any aircraft or pilot logbooks. The pilot's family sold the glider and no further examination was possible. The pilot towing the glider reported that after takeoff, the glider veered to the right. The tow plane yawed hard to the left and the towrope snapped while at an altitude of approximately 700 feet agl. Witnesses reported that as the glider pilot attempted to return to the airport to land, it impacted a ditch that ran between the two runways. Rescue workers reported that the pilot was incoherent and they suspected that he had suffered a stroke. One witness reported that the pilot had medical problems that prohibited him from flying more than 2 hours at a time. The pilot did not possess a medical certificate, nor is he required to. The pilot spent approximately 1 month in the hospital and has no memory of the accident. His wife was unable to find any aircraft or pilot logbooks. The pilot's family sold the glider and no further examination was possible. Source: NTSB Aviation Accident Database (Pre-2008 Archive) Retrieved: 2026-02-12
Verbatim from NTSB's published report. Source file
NTSB_1998_LAX98LA147.txt.
Findings + structured fields enriched from FAA avall.mdb.
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Related research
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Academic papers and agency reports matching this event's aircraft type or causal vocabulary (loss of control). Sourced from NASA NTRS, NTSB Safety Studies, FAA CAMI, AOPA Air Safety Institute, Embry-Riddle Scholarly Commons, arXiv, and the Semantic Scholar academic graph.
- Embry-Riddle Scholarly Commons 2025 · Journal article (JAAER)
A Scoping Review of Aviation Loss of Control Inflight Research
Loss of control – inflight (LOC-I) contributes to aircraft accidents at unacceptably high rates. Significant industry efforts and research have aimed to improve LOC-I prevention, detection, and recove…
- SKYbrary (Eurocontrol) 2024 · SKYbrary article
Loss of Control In-Flight (LOC-I) — SKYbrary Knowledge Base
SKYbrary comprehensive knowledge-base entry on Loss of Control In-Flight — definitions, contributing factors, accident case studies (Air France 447, Colgan 3407), and prevention strategies.
- NTSB Aircraft Accident Reports 2022 · Accident report
Loss of Control on Takeoff in Icing Conditions — Citation 560XL
Cessna Citation 560XL fatal takeoff icing accident, March 2018. Investigation of a Citation 560XL loss-of-control takeoff accident in icing conditions.
- Semantic Scholar 2021 · Article (Aviation)
ANALYSIS OF GENERAL AVIATION FIXED-WING AIRCRAFT ACCIDENTS INVOLVING INFLIGHT LOSS OF CONTROL USING A STATE-BASED APPROACH
Inflight loss of control (LOC-I) is a significant cause of General Aviation (GA) fixed-wing aircraft accidents. The United States National Transportation Safety Board’s database provides a rich source…
- NASA NTRS 2021 · Presentation
Use of Design of Experiments in Determining Neural Network Architectures for Loss of Control Detection
Abstract—We describe empirical methods for selecting a neural network architecture to implement belief state inference on generic commercial transport aircraft.
- NASA NTRS 2021 · Conference Paper
Use of Design of Experiments in Determining Neural Network Architectures for Loss of Control Detection
We describe empirical methods for selecting a neural network architecture to implement belief state inference on generic commercial transport aircraft.
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