A hard landing occurs when an
aircraft
An aircraft is a vehicle that is able to fly by gaining support from the air. It counters the force of gravity by using either static lift or by using the dynamic lift of an airfoil, or in a few cases the downward thrust from jet engines ...
or
spacecraft
A spacecraft is a vehicle or machine designed to fly in outer space. A type of artificial satellite, spacecraft are used for a variety of purposes, including communications, Earth observation, meteorology, navigation, space colonization, p ...
hits the ground with a greater vertical speed and
force
In physics, a force is an influence that can change the motion of an object. A force can cause an object with mass to change its velocity (e.g. moving from a state of rest), i.e., to accelerate. Force can also be described intuitively as a p ...
than in a normal landing.
Landing
Landing is the last part of a flight, where a flying animal, aircraft, or spacecraft returns to the ground. When the flying object returns to water, the process is called alighting, although it is commonly called "landing", "touchdown" or ...
is the final phase in
flight
Flight or flying is the process by which an object moves through a space without contacting any planetary surface, either within an atmosphere (i.e. air flight or aviation) or through the vacuum of outer space (i.e. spaceflight). This can be a ...
, in which the aircraft returns to the
ground. The average vertical speed in a landing is around ; any greater vertical speed should be classed by crew as ''hard''. Crew judgment is most reliable to determine hard landing, as determination based on recorded acceleration value is difficult and not advisable,
partially because there is no recording of true vertical acceleration.
Hard landings can be caused by
weather
Weather is the state of the atmosphere, describing for example the degree to which it is hot or cold, wet or dry, calm or stormy, clear or cloudy. On Earth, most weather phenomena occur in the lowest layer of the planet's atmosphere, the ...
conditions, mechanical problems,
overweight
Being overweight or fat is having more body fat than is optimally healthy. Being overweight is especially common where food supplies are plentiful and lifestyles are sedentary.
, excess weight reached epidemic proportions globally, with mo ...
aircraft,
pilot
An aircraft pilot or aviator is a person who controls the flight of an aircraft by operating its directional flight controls. Some other aircrew members, such as navigators or flight engineers, are also considered aviators, because they a ...
decision and/or
pilot error
Pilot error generally refers to an Aviation accidents and incidents, accident in which an action or decision made by the Aircraft pilot#Airline, pilot was the cause or a contributing factor that led to the accident, but also includes the pi ...
. The term ''hard landing'' usually implies that the pilot still has total or partial control over the aircraft, as opposed to an uncontrolled descent into terrain (a
crash
Crash or CRASH may refer to:
Common meanings
* Collision, an impact between two or more objects
* Crash (computing), a condition where a program ceases to respond
* Cardiac arrest, a medical condition in which the heart stops beating
* Couch su ...
).
Hard landings can vary in their consequences, from mild passenger discomfort to vehicle damage,
structural failure
Structural integrity and failure is an aspect of engineering that deals with the ability of a structure to support a designed structural load (weight, force, etc.) without breaking and includes the study of past structural failures in order to ...
, injuries, and/or loss of life. When an aircraft has a hard landing, it must be inspected for damage before its next flight.
[
Hard landings can cause extensive damage to aircraft if not carried out safely or properly. For example, on 20 June 2012, a ]Boeing 767
The Boeing 767 is an American wide-body aircraft developed and manufactured by Boeing Commercial Airplanes.
The aircraft was launched as the 7X7 program on July 14, 1978, the prototype first flew on September 26, 1981, and it was certified on ...
of All Nippon Airways
, also known as ANA (''Ē-enu-ē'') or is an airline in Japan. Its headquarters are located in Shiodome City Center in the Shiodome area of Minato ward of Tokyo. It operates services to both domestic and international destinations and had mo ...
landed with such force that a large crease formed in the aircraft's skin.
When the final approach
In aeronautics, the final approach (also called the final leg and final approach leg) is the last leg in an aircraft's approach to landing, when the aircraft is lined up with the runway and descending for landing.Crane, Dale: ''Dictionary of ...
isn't stabilised, the crew is to abort and go around
In aviation, a go-around is an aborted landing of an aircraft that is on final approach or has already touched down. A go-around can either be initiated by the pilot flying or requested by air traffic control for various reasons, such as an unsta ...
; this was the recommendation of the Australian Transport Safety Bureau
The Australian Transport Safety Bureau (ATSB) is Australia's national transport safety investigator. The ATSB is the federal government body responsible for investigating transport-related accidents and incidents within Australia. It covers air ...
after investigating the hard landing of a Malaysia Airlines
Malaysia Airlines Berhad (MAB; ms, Penerbangan Malaysia Berhad), formerly known as Malaysian Airline System (MAS; ), and branded as Malaysia Airlines, is the flag carrier airline of Malaysia and a member of the Oneworld airline alliance. (The ...
Airbus A330 at Melbourne Airport
Melbourne Airport , colloquially known as Tullamarine Airport, is the primary airport serving the city of Melbourne, and the second busiest airport in Australia. It opened in 1970 to replace the nearby Essendon Airport. Melbourne Airport is t ...
after arriving from Kuala Lumpur on 14 March 2015.
The Irish low-cost airline
A low-cost carrier or low-cost airline (occasionally referred to as '' no-frills'', ''budget'' or '' discount carrier'' or ''airline'', and abbreviated as ''LCC'') is an airline that is operated with an especially high emphasis on minimizing op ...
Ryanair
Ryanair is an Irish ultra low-cost carrier founded in 1984. It is headquartered in Swords, Dublin, Ireland and has its primary operational bases at Dublin and London Stansted airports. It forms the largest part of the Ryanair Holdings family ...
has acquired a reputation for hard landings.helicopter
A helicopter is a type of rotorcraft in which lift and thrust are supplied by horizontally spinning rotors. This allows the helicopter to take off and land vertically, to hover, and to fly forward, backward and laterally. These attributes ...
s, a hard landing can occur after mechanical or engine damage or failure when the rotor(s) are still intact and free to turn. Autorotation
Autorotation is a state of flight in which the main rotor system of a helicopter or other rotary-wing aircraft turns by the action of air moving up through the rotor, as with an autogyro, rather than engine power driving the rotor. Bensen, Igor ...
, in which airflow over the rotors keeps them turning and provides some lift
Lift or LIFT may refer to:
Physical devices
* Elevator, or lift, a device used for raising and lowering people or goods
** Paternoster lift, a type of lift using a continuous chain of cars which do not stop
** Patient lift, or Hoyer lift, mobile ...
, can allow limited pilot control during descent. As an unpowered descent, it requires considerable pilot skill and experience to safely execute.
A hard landing of a spacecraft
A spacecraft is a vehicle or machine designed to fly in outer space. A type of artificial satellite, spacecraft are used for a variety of purposes, including communications, Earth observation, meteorology, navigation, space colonization, p ...
such as a rocket stage
A multistage rocket or step rocket is a launch vehicle that uses two or more rocket ''stages'', each of which contains its own Rocket engine, engines and Rocket propellant, propellant. A ''tandem'' or ''serial'' stage is mounted on top of anot ...
usually ends with its destruction and can be intentional or unintentional. When a high-velocity impact
Impact may refer to:
* Impact (mechanics), a high force or shock (mechanics) over a short time period
* Impact, Texas, a town in Taylor County, Texas, US
Science and technology
* Impact crater, a meteor crater caused by an impact event
* Impac ...
is planned (when its purpose is to study consequences of impact), the spacecraft is called an impactor.
See also
* Deadstick landing
A deadstick landing, also called a dead-stick landing, is a type of forced landing when an aircraft loses all of its propulsive power and is forced to land. The "stick" does not refer to the flight controls, which in most aircraft are either ful ...
* Emergency landing
An emergency landing is a premature landing made by an aircraft in response to an emergency involving an imminent or ongoing threat to the safety and operation of the aircraft, or involving a sudden need for a passenger or crew on board to term ...
* Forced landing
A forced landing is a landing by an aircraft made under factors outside the pilot's control, such as the failure of engines, systems, components, or weather which makes continued flight impossible. For a full description of these, see article on ' ...
* Soft landing (rocketry)
A soft landing is any type of aircraft, rocket or spacecraft landing that does not result in significant damage to or destruction of the vehicle or its payload, as opposed to a hard landing. The average vertical speed in a soft landing shoul ...
References
External links
Stabilized Approach and Flare Are Keys to Avoiding Hard Landings
/ Flight Safety Foundation, FSF Digest, August 2004
{{DEFAULTSORT:Hard Landing
Aviation risks
Types of landing