How Flying Works
Why Some Landings Are Hard and Some Are Smooth
On 3 May 2019, a Miami Air International Boeing 737 landed at Naval Air Station Jacksonville in a thunderstorm, carrying 143 people home from Guantánamo Bay. It touched down 1,580 feet beyond the start of the runway, well past where it should have, on a wet surface with no grooves cut into the pavement to channel water away. The tyres hydroplaned, unable to grip through the film of water building up under them, and the aircraft slid off the end of the runway into the St. Johns River. Everyone survived. The NTSB's investigation found the crew's approach was unstabilized and their touchdown too far down a runway that gave them no margin for it. It's a real, sobering illustration of the exact opposite of what most passengers instinctively want from a landing: that long, gentle, barely-felt touchdown people read as skill is, on a wet or short runway, often the more dangerous choice, not the safer one.
Why firm is sometimes exactly right
Runway margin disappears faster than passengers tend to assume. On a wet or contaminated surface, braking action can be significantly reduced, and a soft, floating touchdown that eats up several hundred extra feet of runway before the wheels are firmly down is a genuine problem when the runway is short, wet, or sloped, exactly the scenario that put Flight 293 in the river. A firm arrival gets weight onto the main gear immediately, which is the trigger that lets spoilers deploy, brakes bite, and reverse thrust actually do its job, all of which are delayed by a gentle, floating touchdown. Ungrooved wet runways carry a further specific risk: hydroplaning, where the tyres ride on a film of water rather than gripping pavement, which a firm touchdown helps avoid by getting the tyres rotating and biting sooner.
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What repeated hard landings actually cost
None of this means landing technique is free of consequence in the other direction. Modern airliners record vertical acceleration at touchdown, and a landing beyond a defined threshold automatically triggers a maintenance inspection of the airframe and landing gear before the next flight: real time and real cost, even when nothing is actually wrong. “Smooth” isn’t purely a comfort metric for passengers, in other words, but it isn’t a safety benchmark either. The aircraft manual itself specifies that a firm landing is the intended, correct technique in defined conditions, not merely tolerated.
Sources & Further Reading
Common Questions
Frequently Asked Questions
So a hard landing isn't a sign of a bad pilot?
Not automatically, and it can be the opposite — a firm, positive touchdown is the correct and sometimes manual-required technique on a wet, contaminated or short runway. A smooth, floating landing that eats extra runway distance is the riskier choice in those conditions, even though it feels nicer to passengers.
Why does a firm landing actually help on a wet runway?
Water, snow or ice on the runway can drastically reduce braking action and raise the risk of hydroplaning, where the tyres ride on a film of water instead of gripping the pavement. A positive touchdown gets weight onto the wheels immediately, which is what allows braking, spoilers and reverse thrust to actually start working — a soft float delays all of that, and every extra foot of runway used before touchdown is a foot less available to stop.
Does the aircraft actually track how hard a landing was?
Yes — modern airliners record landing-related data (vertical acceleration at touchdown, among other parameters), and a landing beyond a defined threshold automatically triggers a maintenance inspection of the airframe and landing gear before the aircraft flies again.
Why do some landings feel smooth even in a crosswind?
Crosswind technique often produces a firmer, more controlled touchdown by design — pilots prioritize getting the aircraft positively on the centerline and under control over a gentle arrival, since a "greased" landing in gusty crosswind conditions can mean the aircraft floated further off-center than is safe.