NTSB CAROL · Event
Event LAX98LA065
Aircraft involved
Probable cause & findings
The student and flight instructor's failure to verify that the landing gear was in the down position, and the design of the electrical system in which a single-point aircraft system malfunction (one open circuit breaker) disabled both the landing gear warning system and the main gear downlock switches.
Factual narrative
On December 30, 1997, at 1400 hours Pacific standard time, a Cessna 172RG, N5404V, was substantially damaged during landing with the gear partially extended at the Van Nuys, California, airport. There were no injuries to the flight instructor or student pilot. The flight departed Van Nuys on a local instructional flight and no flight plan was filed. Visual meteorological conditions prevailed for the personal flight. The flight instructor stated in his report of accident that the student pilot had extended the landing gear on the downwind leg of the traffic pattern, but then retracted it after being told to go around by the control tower. On the second downwind leg, the student again placed the gear switch in the down position; however, neither the student pilot nor the instructor visually verified that the gear was down and locked. During the final flare for landing, the instructor noted that the gear was not down and that the 5 amp gear warning circuit breaker had opened. He then closed the circuit breaker and noted the gear starting to extend but it had achieved only an intermediate position at the time of touchdown. The airplane subsequently settled on to the runway and incurred damage to the underside, the right wing, and the right horizontal stabilizer. A review of the Cessna 172RG Service Manual, Drawing No. 2471000, "Wiring Diagram-Landing Gear System" indicated that subject circuit breaker, in addition to providing power to the gear indicator lights and warning horn, also powers the main gear downlock switches and the stall warning horn. This was verified by a telephone conversation with the Cessna Aircraft Engineering Department. The flight instructor stated that the student pilot had extended the landing gear on the downwind leg of the traffic pattern, but then retracted it after being told to go around by the control tower. On the second downwind leg, the student again placed the gear switch in the down position; however, neither the student nor the instructor visually verified that the gear was down and locked. During the final flare for landing, the instructor noted that the gear was not down and that the 5 amp gear warning circuit breaker had opened. He then closed the circuit breaker and noted the gear starting to extend, but it had achieved only an intermediate position at the time of touchdown. The airplane subsequently settled on to the runway and incurred damage to the underside, the right wing, and the right horizontal stabilizer. A review of the Cessna 172RG Service Manual, Drawing No. 2471000, 'Wiring Diagram-Landing Gear System' indicated that subject circuit breaker, in addition to providing power to the gear indicator lights and warning horn, also powers the main gear downlock switches and the stall warning horn. Source: NTSB Aviation Accident Database (Pre-2008 Archive) Retrieved: 2026-02-12
Verbatim from NTSB's published report. Source file
NTSB_1997_LAX98LA065.txt.
Findings + structured fields enriched from FAA avall.mdb.
Full investigation docket on
data.ntsb.gov ↗.
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Related research
What the literature says.
Academic papers and agency reports matching this event's aircraft type or causal vocabulary (stall). Sourced from NASA NTRS, NTSB Safety Studies, FAA CAMI, AOPA Air Safety Institute, Embry-Riddle Scholarly Commons, arXiv, and the Semantic Scholar academic graph.
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- arXiv 2023 · arXiv preprint
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Two-dimensional square ice in graphene nanocapillaries at room temperature is a fascinating phenomenon and has been confirmed experimentally.
- arXiv 2023 · arXiv preprint
Polycrystallinity enhances stress build-up around ice
Damage caused by freezing wet, porous materials is a widespread problem, but is hard to predict or control. Here, we show that polycrystallinity makes a great difference to the stress build-up process…
- arXiv 2022 · arXiv preprint
Enhanced Prediction of Three-dimensional Finite Iced Wing Separated Flow Near Stall
Icing on three-dimensional wings causes severe flow separation near stall. Standard improved delayed detached eddy simulation (IDDES) is unable to correctly predict the separating reattaching flow due…
- Embry-Riddle Scholarly Commons 2021 · Journal article (JAAER)
Analysis on the Negative Emotional, Physiological, and Cognitive Responses Elicited from of the Activation of a Stall Alarm
Failing to identify an aerodynamic stall can lead to the inability of an aircraft to sustain flight. To warn pilots of an impending or fully-developed stall, many aircraft have safety devices installe…
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