A Boeing 767 arriving at Miami with a gusty quartering tailwind, heavy precipitation nearby and a rapidly increasing descent rate presents a troubling sequence well before the aircraft leaves the runway. Juan Brown builds his analysis around preliminary ADS-B data showing the cargo jet descending at roughly 1,700 to 2,000 feet per minute near the end of the approach while carrying considerably more ground speed than the preceding American Airlines 737. His comparison makes the central concern unusually easy to see: the accident aircraft’s numbers look dramatically different from those of a more conventional stabilized arrival.
The strongest portion of the presentation is the reconstruction of the approach itself. Brown combines reported winds, radar precipitation, ATC exchanges and flight-tracking data to argue that the crew faced a left-quartering tailwind and an increasingly unstable descent. He is careful at several important points to acknowledge what remains unknown, particularly the exact touchdown point and the contents of the cockpit voice and flight data recorders. That restraint matters because his broader interpretation is still preliminary, even when the available data appears strongly suggestive.
His explanation of the 767’s landing-gear tilt and air-ground sensing system is especially useful. Brown argues that video imagery appears to show the left main gear remaining lightly loaded while the right gear and nose gear are already on the runway, potentially preventing the aircraft from transitioning fully into ground mode. He then connects that condition to delayed availability of automatic ground spoilers and thrust reversers, providing a technically coherent explanation for why the aircraft’s speed may have decayed so slowly after touchdown. The accompanying training material makes a complicated system understandable without reducing it to a vague mechanical failure.
Some conclusions, however, move ahead of what has yet been formally established. Brown repeatedly describes the approach as unstabilized and states that the air-ground sensing issue explains the slow deceleration and eventual overrun, but the recorder data had not yet been released during his discussion. His interpretation may fit the visible and tracking evidence, yet determining exactly when the aircraft touched down, what control inputs were made, which systems activated and why the crew continued the landing requires information he explicitly says investigators were still retrieving. The distinction between a persuasive working theory and a confirmed accident sequence could therefore be emphasized more consistently.
The discussion of airport infrastructure is similarly valuable but somewhat categorical. Brown pushes back on criticism that Miami lacked an engineered materials arresting system, arguing that EMAS is intended primarily for substantially lower overrun speeds and that the airport instead had a 1,000-foot runway safety area. That provides useful context against simplistic claims that one missing installation necessarily caused the fatalities. Still, his assertion that the aircraft would have effectively passed over EMAS at its apparent speed is presented as a conclusion rather than something demonstrated with accident-specific performance evidence.
Brown also widens the scope beyond cockpit technique by raising questions about 21Air’s rapid growth, contracting model, management and FAA oversight. Those are legitimate areas investigators may examine, and he appropriately invokes the broader “Swiss cheese” concept rather than portraying one bad decision as the complete cause. Yet this section is inherently more speculative than the aerodynamic and systems analysis because no evidence is presented tying the operator’s organizational structure or growth directly to the accident. His dismissive remark about another commentator also adds unnecessary friction to an otherwise professional technical discussion.
Pros
- Comparing the accident aircraft’s descent rates and ground speeds with the preceding 737 clearly illustrates why the approach raises stabilization concerns.
- The explanation of the 767 landing-gear tilt sensors, ground spoilers and thrust-reverser logic turns a complex aircraft system into an understandable potential contributor.
- Weather, wind components, ATC recordings, tracking data and accident imagery are combined into a coherent preliminary reconstruction.
- Important unknowns, including touchdown location and recorder evidence, are explicitly acknowledged.
- The discussion usefully separates runway-safety-area requirements from simplistic assumptions that EMAS would necessarily have prevented the overrun.
Cons
- Several preliminary interpretations, particularly the claimed air-ground sensing sequence, are stated more definitively than the still-missing recorder evidence warrants.
- The suggestion that 21Air’s growth, management or regulatory oversight may form part of the causal chain is not supported with accident-specific evidence at this stage.
- The EMAS discussion would be stronger with more direct support for the assertion that it could not have materially affected an overrun at the apparent speed involved.
- A dismissive aside about another aviation commentator detracts from an otherwise measured technical presentation.
Brown provides a detailed and largely accessible early analysis that makes the unstable approach, wind conditions and unusual landing-gear behavior understandable without pretending every investigative question has already been answered. Its technical reasoning is often persuasive, but some provisional explanations harden into conclusions before the flight recorder evidence is available. As an initial reconstruction it is highly informative, provided viewers keep that distinction in mind.
