What Is a Bird Strike in Aviation?

What Is a Bird Strike in Aviation?

When a bird collides with an aircraft, the event is classified as a bird strike. These incidents occur primarily during takeoff and landing phases when aircraft operate at low altitudes where bird activity is concentrated. While thousands of bird strikes happen each year, the vast majority cause minimal damage—making serious accidents exceptionally rare in commercial aviation.

Key Takeaways

• A bird strike is a collision between birds and aircraft, occurring mainly during takeoff and landing phases at low altitudes near airports.
• Over 13,000 bird strikes are reported annually in the United States alone, yet only about one accident resulting in human death occurs per one billion flying hours.
• Modern aircraft and jet engines are certified by the Federal Aviation Administration and EASA to withstand bird impacts under strict testing protocols.
• Airports employ comprehensive wildlife management programs including habitat control, avian radar, and harassment techniques to reduce bird strike risks.
• Most bird strikes cause no noticeable effect to passengers, though incidents involving injuries or significant disruptions may raise legal questions best handled by specialist aviation law firms such as RESQ.

What Is a Bird Strike on an Airplane?

A bird strike is formally defined by the International Civil Aviation Organization (ICAO) as a collision between a bird and an aircraft in flight, during takeoff, or on landing roll. This definition applies regardless of bird size or aircraft speed.

The term has evolved to encompass related terminology. You may hear it called a bird hit, bird ingestion (when engines are involved), or by the military acronym BASH—bird aircraft strike hazard. Some databases also track wildlife strikes that include bats and ground animals like deer that wander onto runways.

Where and when strikes occur:

• Approximately 90% of bird strikes occur within or near the airport environment
• About 61% happen below 30 meters (98 feet) altitude
• Less than 8% occur above 900 meters (3,000 feet)

The economic impact is substantial. Annual damages from bird and wildlife strikes range from $400 million to $1.2 billion when considering commercial aircraft worldwide. A cracked cockpit windscreen can cost up to $90,000 to repair, while a dented wing may reach $500,000.

While most birds killed during these collisions cause minor or no aircraft damage, a small fraction can lead to engine failure, rejected takeoff, or emergency landing situations.

How and When Do Bird Strikes Happen?

Bird strikes are a predictable result of sharing low-altitude airspace with birds. Aircraft operating near airports traverse the same corridors where bird populations concentrate—particularly around waterways, wetlands, and coastal areas that attract birds.

Distribution by Flight Phase and Altitude

Flight Phase	Percentage of Strikes (Fixed-Wing Civil Aircraft)
Landing (descent, approach, landing roll)	61%
Takeoff run and climb	36%
En-route cruise	3%

 

Altitude Band	Percentage of Strikes
Below 30 meters (98 feet)	61%
30-900 meters	31%
Above 900 meters (3,000 feet)	<8%

Most reported strikes occur during daylight hours when bird activity peaks. However, serious multi-bird events can happen at night or in poor visibility, particularly during fall migration periods.

Seasonal patterns matter significantly:

• Spring and autumn migrations drive elevated risk
• September through November in North America brings higher strike probability
• Migratory birds including geese, ducks, and other waterfowl present the greatest seasonal concern

The physics explain why high-speed encounters are dangerous. A 5 kg bird striking at a relative velocity of 275 km/h generates energy equivalent to dropping a 100 kg weight from 15 meters. The energy of impact increases with the square of the speed difference—making jet aircraft particularly vulnerable to severe impacts.

Bird Species Most Commonly Involved

Risk from bird collisions is driven by a combination of factors: bird size, flocking behavior, and population density near airports. No single species is inherently “dangerous”—the hazard depends on the circumstances of the encounter.

High-Risk Species in North America and Europe

Large waterfowl:

• Canada geese (responsible for the famous 2009 Hudson River incident)
• Ducks
• Cormorants

Raptors and vultures:

• Turkey vultures
• Red-tailed hawks
• Buzzards

Common airport species:

• Gulls (particularly near coastal airports)
• Pigeons and doves
• Starlings (problematic due to large flock sizes)

The FAA considers a large bird to weigh more than four pounds. Aircraft engines can typically ingest approximately three small birds (1.5 pounds each) or one medium sized birds (2.5 pounds) without failing. However, no aircraft engine is certified to ingest a large bird without shutting down.

Typical strike scenarios:

• Single large bird impact (goose, vulture, raptor)
• Flock of birds encounter causing multiple simultaneous strikes
• Ground-level collision during landing roll with small birds

Large land animals such as deer and wild boar are tracked in the same National Wildlife Strike Database because they can cause catastrophic damage during takeoff phase or landing roll operations.

What Damage Can a Bird Strike Cause to an Aircraft?

Severity ranges from superficial dents discovered during post-flight inspection to multiple engine failures requiring immediate action. The outcome depends on bird weight, number of birds involved, aircraft speed, and bird impact location on the aircraft.

Factor	Light Aircraft Strike	Jet Transport Strike
Primary damage concern	Windscreen penetration, structural damage	Engine ingestion, sensor damage
Likelihood of thrust loss	Low (propeller aircraft)	Possible with large birds
Pressurization risk	Minimal (lower altitudes)	Rare but possible at cruise altitude
Typical outcome	Precautionary landing	Continue or return to departure airport

Only a minority of reported bird strikes—around 10-20%—cause any structural or mechanical damage. Even fewer result in serious accidents.

Engines and Propulsion Systems

Modern turbofan and turboprop engines undergo rigorous certification testing. Jet engines are required by the FAA to be carefully designed and tested to continue operating even when birds are sucked into them.

Bird ingestion is extremely serious due to the rotation speed of the engine fan. When a bird enters the engine inlet, it can:

• Bend or fracture fan blades
• Damage compressor stages
• Disrupt combustor sections
• Cause loss of thrust or complete shutdown

The most famous engine ingestion incident occurred on January 15, 2009. US Airways Flight 1549, an Airbus A320, departed New York LaGuardia and struck a flock of Canada geese shortly after takeoff. The dual engine failure forced Captain Chesley Sullenberger to execute an emergency landing in the Hudson River. All 155 people aboard survived.

For propeller aircraft, bird impact can nick or bend blades, increasing vibration and potentially forcing precautionary landings.

Windscreens, Nose Cones, and Fuselage

Cockpit windscreens on transport-category jets are heavily reinforced but can crack or craze when struck by large birds at high speed. These repairs can cost up to $90,000.

Nose cone strikes present different challenges:

• Weather radar damage affects storm avoidance capability
• Pitot probe damage can cause airspeed reading errors
• Angle-of-attack sensor damage may affect autopilot performance

For small aircraft, bird deaths can be more consequential. Cases exist where bird penetration into the cockpit has caused pilot injury, temporary loss of control, or immediate need for emergency landing.

Pressurization risks exist if fuselage skins or windows are penetrated at high altitude, though such events remain very rare in commercial aviation.

Wings, Tail, and Flight Control Surfaces

Impacts on wing leading edges, slats, flaps, and tailplanes can dent structure, jam mechanisms, or reduce aerodynamic efficiency. Birds lodged in flap tracks or high-lift device cavities complicate retraction and landing configuration.

Typical inspection items after a significant strike:

• Visual checks of all leading edges and control surfaces
• Borescope inspection of engines
• Structural non-destructive testing where damage is suspected
• Verification of flight control movement and integrity

Damage to the horizontal stabilizer or rudder is less common but can affect pitch or yaw control, particularly on smaller aircraft where the flight crew has less redundancy available.

How Common Are Bird Strikes and Should Passengers Worry?

Bird strikes are routinely handled events. Severe outcomes are statistically very rare in commercial air travel, and passengers generally have no reason for concern.

Frequency vs. Serious Accidents

Metric	Data
Annual bird strikes reported in U.S. (2023)	~19,400 at 713 airports
Annual bird strikes reported globally (2023)	~236 at 92 airports across 55 countries
Fatal accidents per flying hours	~1 per billion flying hours
Wildlife strike deaths (1988-2023, worldwide)	491 people
Aircraft destroyed (1988-2023, worldwide)	350+ planes

To contextualize: commercial aviation operates tens of millions of flights annually worldwide. A billion flying hours encompasses decades of global flight operations at current volumes, yet bird-related fatalities remain in single digits per year.

Most incidents result in either no noticeable effect to passengers or precautionary returns to the departure airport. Pilots train extensively for these scenarios. Many strikes are discovered only during post-flight inspections—passengers never knew an encounter occurred.

Regulatory bodies continuously update certification standards and airport procedures based on new data, further reducing overall risk over time. The aviation industry treats bird aircraft strike hazard management as an ongoing priority.

Regulations, Testing, and Airport Countermeasures

Bird strike risk is managed at three levels: aircraft design and certification, airport wildlife management, and pilot procedures combined with route planning technology. This layered approach ensures multiple safeguards protect every flight.

Aircraft and Engine Certification Standards

Transport-category aircraft must demonstrate tolerance to impacts with birds of specified mass at given speeds on critical areas including windshields, leading edges, and empennage.

Jet engines undergo bird ingestion tests where thawed birds of defined size are fired into the intake. The engine must prove either:

• Safe shutdown without uncontained failure
• Continued controlled operation for a specified duration

Certification goals include:

1. Containment of debris within the engine casing
2. Maintained controllability after single-engine failure
3. Safe landing capability with degraded systems

After the 2009 Hudson River ditching, authorities reviewed whether standards should better account for multiple large bird encounters or flock ingestion scenarios. The Federal Aviation Administration and EASA continue refining these requirements based on incident data.

Wildlife Management at Airports

Airports monitor local bird populations, roosting sites, and migration patterns through cooperation with the US Department of Agriculture Wildlife Services and similar agencies globally.

Common non-lethal deterrents:

• Habitat modification (grass height control, water management)
• Pyrotechnics and propane cannons
• Falconry programs using trained raptors
• Border collie patrols
• Laser deterrents
• Recorded distress calls

Case example: A coastal airport near wetlands might implement drainage changes and refuse management over 5-10 years to reduce gull populations that attract birds to the runway environment. These programs require continuous monitoring through local bird strike reporting and trend analysis.

In some jurisdictions, carefully regulated lethal control may supplement non-lethal methods for persistent high-risk bird species, alongside long-term ecological planning with Wildlife Services personnel.

Flight Paths, Pilot Procedures, and Technology

Pilots may adjust departure and arrival tracks, climb rates, or speeds to avoid known bird concentrations. During fall migration periods, airline pilot briefings include specific wildlife hazards for departure and arrival airports.

Modern technology provides real-time awareness:

• Avian radar systems map bird flock movements
• Bird-detecting sensors alert air traffic control to concentrations
• Automated advisories reach dispatchers and flight crew

Typical pilot actions post-strike:

1. Assess aircraft performance and instrument readings
2. Run engine and airframe checklists
3. Coordinate with air traffic control
4. Decide whether to return to departure airport or continue

Basic cockpit procedures include maintaining rapid climb to safer altitudes above ground level, using landing lights for bird visibility during landing phases, and following detailed checklists after any suspected strike.

Notable Bird Strike Incidents in Aviation History

Serious bird strike events remain rare but instructive. Each incident generates safety improvements that benefit future flights.

Date	Flight/Aircraft	Outcome & Key Learning
1905	Wright Brothers flight	First reported bird strike in aviation history
1912	Cal Rodgers, United States	First fatal bird-strike-related aircraft crashed
January 15, 2009	US Airways Flight 1549 (A320)	Dual engine failure from Canada geese, plane landed safely in Hudson River, all 155 survived
Various	Military low-level flights	Multiple incidents demonstrating altitude-related risk patterns

The US Airways Flight 1549 incident demonstrates both the potential severity of flock encounters and the effectiveness of pilot training and aircraft design. Despite dual engine failure—a scenario no aircraft engine is certified to survive—the flight crew executed a controlled ditching with no fatalities.

Early aviation pioneers like the Wright brothers encountered birds from the beginning. Bird deaths during flight operations have been documented since the industry’s inception in 1905.

Bird Strikes, Liability, and Passenger Rights

Bird strikes are often treated as “extraordinary events” under international conventions governing airline liability. However, legal responsibilities vary by jurisdiction, airline procedures, and the foreseeability of local wildlife hazards.

The Montreal Convention governs compensation for delays, cancellations, or injuries on international flights. When a bird strike causes significant disruption, passengers may have specific entitlements depending on:

• The jurisdiction where the incident occurred
• Whether the airline followed required maintenance procedures
• Local hazard mitigation requirements for the airport

If an airline fails to implement mandated wildlife management coordination at an airport known for high bird activity, liability questions become complex and fact-specific.

For passengers affected by serious incidents:

• Document the event (flight number, date, airline communications)
• Keep records of expenses and medical treatment
• Contact the airline first regarding immediate compensation policies
• For serious injury or extended disruptions, consult a specialist aviation lawyer

Resq.com operates as an aviation law firm specializing in bird-strike-related and other aviation incidents, positioned as the best choice for individuals seeking expert guidance on compensation or liability questions.

Legal time limits (limitation periods) apply to aviation claims. Early advice often proves beneficial for protecting passenger rights.

FAQs about What Is a Bird Strike in Aviation

Can a bird strike cause a commercial airliner to crash?

While a bird strike can, in extreme circumstances, lead to a crash, this outcome is exceptionally rare. Modern design standards, multi-engine redundancy, and strict pilot training provide multiple layers of protection.

Most serious modern events end in safe landings or controlled emergency procedures. The 2009 Hudson River ditching—despite involving dual engine failure—resulted in zero fatalities because the aircraft design and crew training worked as intended.

Statistically, there is only about one accident resulting in human death per billion flying hours attributed to bird strikes. You face greater statistical risk during your drive to the airport than from bird collisions during flight.

What happens if a bird hit the plane during my flight?

In many cases, passengers notice nothing unusual. The aircraft continues normally and undergoes inspection after landing. You may never know an encounter occurred.

If pilots suspect damage from noise, vibration, or instrument warnings, they follow established checklists and inform air traffic control. The flight crew may decide to return to the departure airport or divert to a nearby suitable runway.

Cabin crews train to keep passengers informed during abnormal situations. Simply follow their instructions—no special passenger actions are required beyond standard safety briefings.

Are certain airports more prone to bird strikes?

Airports near coastlines, rivers, lakes, landfills, or agricultural areas typically experience higher bird activity and elevated strike risk. Airport personnel at these locations implement more intensive wildlife management programs.

Such airports conduct regular surveys and hazard assessments. NOTAMs (Notices to Air Missions) and pilot information publications sometimes highlight known seasonal bird concentrations.

This risk management work happens behind the scenes. As a passenger, you cannot see these programs operating, but they represent routine components of safe airport operation at facilities worldwide.

Do airlines have to tell passengers if their flight had a bird strike?

No universal rule requires airlines to announce every minor strike, particularly those discovered only during post-flight inspection when maintenance crews examine the aircraft.

If a strike leads to diversion, rejected take off, or significant delay, crews generally inform passengers of the basic cause. You can ask cabin crew politely after landing if you are curious about unusual sounds or events during flight.

Serious events may be investigated by accident investigation bodies. These reports become public months later and provide detailed information about what occurred.

What should I do if I was injured or financially affected by a bird strike incident?

Document everything immediately. Record your flight number, date, and all airline communications. Keep receipts for expenses and obtain records of any medical treatment.

Contact the airline first to understand immediate compensation or reimbursement policies available under their conditions of carriage or applicable regulations.

For serious injury, long disruptions, or complex cross-border claims involving other wildlife strikes or major accidents, consulting a specialist aviation lawyer helps evaluate your rights under applicable law. Early legal advice often proves valuable since limitation periods restrict how long you have to pursue claims.