NTSB CAROL · Event
Event LAX05LA049
Aircraft involved
Probable cause & findings
The activation of the low main rotor rpm warning system for undetermined reasons.
Factual narrative
HISTORY OF FLIGHT
On December 11, 2004, at 1013 Pacific standard time, a Robinson R22B, N145RJ, made a hard landing and collided with obstacles while attempting to execute an emergency autorotation onto the rooftop heliport on the Wells Fargo Bank Building, downtown Los Angeles, California. Rainbow Air Academy, Inc., was operating the helicopter under the provisions of 14 CFR Part 91. The private pilot and the one passenger were not injured; the helicopter sustained substantial damage. The personal local flight departed Long Beach, California, about 0915. Day visual meteorological conditions prevailed, and no flight plan had been filed. The primary wreckage was at 34 degrees 3.182 minutes north latitude and 118 degrees 15.099 minutes west longitude. The renter pilot reported that while flying over downtown Los Angeles, about 1,200 feet mean sea level (msl), he observed the low rotor speed warning light illuminate followed by the low rotor speed warning horn activating. He entered an autorotation and attempted to land on top of the Wells Fargo Bank Building, which is a 56-story office building. During the landing phase the helicopter overshot the landing pad, and the main rotor blades came in contact with window washing equipment. The helicopter missed the helipad, and came to rest below the helipad on the roof. The helicopter sustained damage to the main rotor blades and tail boom. The helicopter was recovered from the rooftop and transported to storage for further examination. Investigators from the National Transporatio Safety Board, the Federal Aviation Administration, Robinson Helicopter Company, and Textron Lycoming were parties to the investigation. The wreckage was examined at Robinson Helicopter Company, Torrance, California, on January 6, 2005. Investigators established control continuity for the throttle and mixture controls. Both controls moved freely from stop to stop. The bottom spark plugs were removed from each cylinder. The spark plug electrodes were gray in color, which corresponded to normal operation according to the Champion Aviation Check-A-Plug AV-27 Chart. Fuel samples were taken from the main and auxiliary fuel tanks and the gascolator. All three samples were blue in color with no water present. The vent lines were disconnected from the fuel tanks, which appeared to be a result of contact with push/pull tubes at ground impact. The vent lines were clear. Without using any extraneous or substitute equipment, the engine was started, warmed up and run at 104 percent for approximately 10 minutes with no anomalies. The governor was switched on, and it functioned properly. A magneto ground check was performed with the following results: When switched to the "L" position, the rpm dropped (approximately 15 percent). When switched to the "R" position, there was no rpm drop. When switched to the "OFF" position, the rpm dropped, but the engine continued to run. Examination of the wires on the left magneto revealed the "P" lead was attached to the "Retard" terminal, and the "Retard" lead was attached to the "Print" terminal. The leads were removed and reinstalled properly. The engine was again run, and a magneto ground check was performed. Both magnetos responded properly.
ADDITIONAL INFORMATION
The Safety Board investigator released the wreckage to the owner's representative. While flying over downtown Los Angeles, about 1,200 feet mean sea level, the pilot observed the low rotor warning light illuminate followed by the low rotor warning horn activating. He entered an autorotation and attempted to land on a helipad on top of a 56-story office building. During the landing phase the helicopter overshot the landing pad and the main rotor blades came in contact with the window washing equipment. The helicopter missed the helipad and came to rest below the helipad on the roof. Examination of the aircraft systems and the engine failed to disclose any abnormality. Source: NTSB Aviation Accident Database (Pre-2008 Archive) Retrieved: 2026-02-12
Verbatim from NTSB's published report. Source file
NTSB_2004_LAX05LA049.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.
- NASA NTRS 2026 · Conference Paper
Computational Analysis of Steady State Aerodynamics of Transonic Truss-Braced Wing Configuration in Deep Stall
This study presents a computational investigation of steady state aerodynamics of the Subsonic Ultra-Green Aircraft Research (SUGAR) Transonic Truss-Braced Wing (TTBW) configuration over a wide range …
- arXiv 2023 · arXiv preprint
Automating Bird Diverter Installation through Multi-Aerial Robots and Signal Temporal Logic Specifications
This paper tackles the task assignment and trajectory generation problem for bird diverter installation using a fleet of multi-rotors.
- arXiv 2023 · arXiv preprint
Variation of Critical Crystallization Pressure for the Formation of Square Ice in Graphene Nanocapillaries
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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