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Condition in which an engine turns beyond its design limit
important of which are the duration of the overspeed and the speed attained. With some engines, a momentary overspeed can result in greatly reduced engine life
Overspeed
Standard terms to define airspeeds
inoperative. VMO Maximum operating limit speed. Exceeding VMO may trigger an overspeed alarm. VMU Minimum unstick speed. VNE Never exceed speed. In a helicopter
V_speeds
2011 aviation accident in Papua New Guinea
propellers to overspeed and leading to a complete loss of engine power. A 'beta lockout' mechanism that would have prevented the overspeed even in case
Airlines_PNG_Flight_1600
US airliner with 4 piston engines, 1947
experienced an overspeed on the Romance less than six months before its loss, that an overspeed was a likely cause of the crash. The overspeed theory calls
Boeing_377_Stratocruiser
1945 train derailment in Bourne End, Hertfordshire, England
inattention led to overspeed through a curve – Little Falls Gulf Curve crash - overspeed through curve – Goswick rail crash - overspeed through turnout –
Bourne_End_rail_crash
Aviation accident in Havelian, Pakistan
beyond the overspeed value, the aircraft was equipped with a device called the overspeed governor (OSG). The protection system of the overspeed governor
Pakistan International Airlines Flight 661
Pakistan_International_Airlines_Flight_661
Large twin-aisle airliner family
computer-calculated framework of operating parameters, acting to prevent stalls, overspeeds, and excessively stressful maneuvers. This system can be overridden by
Boeing_777
Drag device streamed behind a vessel
becoming side-on to the waves. A boat that has deployed a drogue should not overspeed down the slope of a wave and crash into the next one, nor will the vessel
Drogue
Canadian turboprop airliner
High-speed airflow through the improperly configured props caused them to overspeed and drive the engines, which caused engine damage and a total loss of
De_Havilland_Canada_Dash_8
2006 video game
game was re-released in June 2008 by City Interactive under the title Overspeed: High Performance Street Racing, as a low-price (budget) game. Matt Peacock
L.A._Street_Racing
1996 aviation accident in the Atlantic Ocean
the circuit breakers. When the first circuit breaker was checked, the overspeed warning appeared, as the captain’s ASI, the primary source of the information
Birgenair_Flight_301
Train protection system in the UK and Victoria, Australia
the signal is clear, the loops will de-energise. The first pair, the Overspeed Sensor System (OSS), is sited at a position determined by line speed and
Train Protection & Warning System
Train_Protection_&_Warning_System
Mechanical issue caused by fuel released from an unintended source
in which the engine draws excessive fuel from an unintended source and overspeeds at higher RPM, resulting in a catastrophic mechanical failure due to a
Diesel_engine_runaway
Jet turbine-powered concept car
and operating a clutch with a manual gearbox would cause the turbine to overspeed. This concept car was the result of a collaboration between Jay Leno and
EcoJet_concept_car
Automatic shutdown of power generation turbine
generation. Many events can cause a turbine trip, including: turbine overspeed condition where the turbine accelerates over its design speed, typically
Turbine_trip
Railway cab signaling technology used on high-speed rail
Transmission voie-machine (French: [tʁɑ̃smisjɔ̃ vwamaʃin]; TVM; 'Track-to-train transmission') is a form of in-cab signalling originally deployed in France
Transmission_voie-machine
2010 aircraft accident in Libya
which their aircraft became overspeed during the approach to Tripoli. Knowing that they were going to pass the overspeed limit, Abu-Shawashi decided to
Afriqiyah_Airways_Flight_771
Turbine engine driving an aircraft propeller
The turboprop system consists of 3 propeller governors: a governor, an overspeed governor, and a fuel-topping governor. The governor works in much the
Turboprop
Train crash in Warwickshire, England
Salisbury rail crash - 1906 - Overspeed through sharp curve through station. 28 killed. Morpeth rail crashes - 1969 etc. - Overspeed through sharp curve. Waterfall
Sutton_Coldfield_rail_crash
2005 train derailment
Line Rock Island District Operator Metra Incident type Derailment Cause Overspeed through interlocking Statistics Trains 1 Passengers 185 Crew 4 Deaths
2005 Metra Rock Island derailment
2005_Metra_Rock_Island_derailment
Train wreck
Line Line 1 Operator Ferrocarrils de la Generalitat Valenciana Incident type Derailment Cause Overspeed at the curve Statistics Deaths 43 Injured 47
Valencia_Metro_derailment
Type of rotorcraft
engine cannot drive the blades at sufficient RPM to maintain flight. Rotor overspeed, which can over-stress the rotor hub pitch bearings (brinelling) and,
Helicopter
Turboshaft with power from independent exhaust
more at risk than a single-shaft turboprop. It could suffer a turbine overspeed to destruction after losing its connection to the propeller load. In a
Free-turbine_turboshaft
Family of interceptor and reconnaissance aircraft
Mach 3.2, a limit of Mach 2.83 had to be imposed as the engines tended to overspeed and overheat at higher airspeeds, possibly damaging them beyond repair
Mikoyan-Gurevich_MiG-25
2007 aircraft accident in Indonesia
Accident Date 7 March 2007 (2007-03-07) Summary Runway overrun caused by overspeed approach and improper landing configuration due to pilot error Site Adisutjipto
Garuda_Indonesia_Flight_200
Airport in Richmond, British Columbia, Canada
flight to Prince Rupert Airport when the starboard propeller went into overspeed and the decision was made to return to Vancouver International. On October
Vancouver International Airport
Vancouver_International_Airport
1974 aviation accident in France
distorted transmission from the plane and the aircraft's pressurisation and overspeed warnings were heard over the pilots' words in Turkish, such as the co-pilot
Turkish_Airlines_Flight_981
System of identifying electrical power devices
Reversing Device 10 - Unit Sequence Switch 11 - Multifunction Device 12 - Overspeed Device 13 - Synchronous-Speed Device 14 - Underspeed Device 15 - Speed
ANSI_device_numbers
1991 aircraft accident in Thailand
warning and a second snapping sound, followed by various alerts such as overspeed and a second master caution, and Welch's last recorded words: "Jesus Christ"
Lauda_Air_Flight_004
Transport accident in Mexico
27 January 2026, the FGR reported that the cause of the derailment was overspeed when passing through the derailment curve (65 kilometers per hour [40 mph]
2025_Oaxaca_train_derailment
2000 railway incident in Germany
Kingdom – overspeed through turnout Bourne End rail crash, United Kingdom – overspeed through turnout Goswick rail crash, United Kingdom – overspeed through
Brühl_train_derailment
Train accident in Tuusula, Finland, on 21 April 1996
accident – overspeed through turnout Australia Waterfall rail accident – overspeed through sharp curve Germany Brühl train disaster – overspeed through turnout
Jokela_rail_accident
Vertical transport machine
nondestructively grips the plunger and stops the car. A device known as an overspeed or rupture valve is attached to the hydraulic inlet/outlet of the cylinder
Elevator
Family of turbofan aircraft engines
manufactured oil feed stub pipe cracking and causing a turbine disc to overspeed and fracture. In the aftermath of the incident, Qantas, Lufthansa and
Rolls-Royce_Trent
Reciprocating internal combustion engine
QSK95 Mitsubishi SR2-PTA series engine "Caterpillar C175 spec sheet". Derived from governed RPM times overspeed capability given in spec sheet. v t e
Caterpillar_C175
First artificial Earth satellite
thrust termination to occur one second earlier when a sensor detected overspeed of the empty RP-1 turbopump. There were 375 kg (827 lb) of LOX remaining
Sputnik_1
2008 aviation accident over the Indian Ocean
autopilot and inertial reference systems, and contradictory audible stall and overspeed warnings. During this time, the captain began to control the aircraft
Qantas_Flight_72
2000 aviation accident in the Atlantic Ocean
for just 50 milliseconds (a mere "Whoop-") as the stall warning and the overspeed warning took priority over the GPWS warning. Investigators concluded that
Kenya_Airways_Flight_431
Machine that uses steam to rotate a shaft
control. Uncontrolled acceleration of the turbine rotor can lead to an overspeed trip, which causes the governor and throttle valves that control the flow
Steam_turbine
2017 train accident in Washington, US
experience all elements of the controls, including the overspeed alarms. Unfamiliar with the overspeed alarms and not practiced for the appropriate response
2017 Washington train derailment
2017_Washington_train_derailment
Britain's first jet fighter, 1943–1980s
the cause believed to have been an engine compressor failure due to overspeed. DG208/G made its début on 20 January 1944, by which time the majority
Gloster_Meteor
Aircraft control computer software
autothrottle. High speed protection will automatically recover from an overspeed. There are two speed limitations for high-altitude aircraft, VMO (maximum
Flight_control_modes
Train derailment in 1947
Railroad Service Eastbound Red Arrow #68 Incident type Derailment Cause Overspeed caused by human error Statistics Trains 1 Vehicles 18 Deaths 24 Injured
The_Wreck_of_the_Red_Arrow
1970s German experimental helicopter
found to be unsuccessful for this size of aircraft. Due to a high rotor overspeed, they could perform jump take-offs to 280 feet (85 m) at a rate of 1,600
VFW-Fokker_H3_Sprinter
1955 railway accident in the UK
crash – similar overspeed through turnout Goswick rail crash – similar overspeed through turnout Jokela rail crash – similar overspeed accident in Finland
Milton_rail_crash
2020 aviation accident in Pakistan
the aircraft had an airspeed of 242 kn (448 km/h). This resulted in an "overspeed" warning after the flaps were extended. Soon afterward, the aircraft's
Pakistan International Airlines Flight 8303
Pakistan_International_Airlines_Flight_8303
American aerospace and industrial products company
aviation and commuter aircraft rely on Woodward designed propeller and overspeed governors for turboshaft and turboprop engines. As of September 2016[update]
Woodward,_Inc.
Motor which works on direct current
counter-EMF to balance the supply voltage. The motor can be damaged by overspeed. This is called a runaway condition. Series motors called universal motors
DC_motor
Electric switch that uses the centrifugal force of a rotating shaft
and ignition circuits, the governed speed indication circuit and the overspeed protection circuit of the auxiliary power unit. This switch is mounted
Centrifugal_switch
1962 aircraft ditching in the Atlantic Ocean
by Garrett, it was too late because lack of oil in the engine led to overspeed. Investigators also criticized the captain for landing into the waves
Flying_Tiger_Line_Flight_923
1996 aviation accident in the Pacific Ocean
including the altitude and airspeed indicator, rudder ratio, mach speed trim, overspeed, underspeed and flying too low. The crew declared an emergency and requested
Aeroperú_Flight_603
Airline in Yukon, Canada
flight to Prince Rupert Airport when the starboard propeller went into overspeed and the decision was made to return to Vancouver International. On 14
Air_North
Unit of rotational speed
per second Rotational speed Compressor map Turn (geometry) Idle speed Overspeed (engine) Redline Rev limiter Tachometer ISO 80000-3:2019. "Physical parameters"
Revolutions_per_minute
American action-comedy television series
maglev train in Kazakhstan and are successful in stopping the theft but overspeed the train risking a crash at the terminal. 3 3 "Honeyplot" Holly Dale
FUBAR_(TV_series)
Light rail vehicle
MBTA Muni Seats 52 68 Cab Signalling No Yes Steps Fixed Convertible Overspeed Control Yes No Destination Signs Manual Automatic Air Conditioning Yes
US Standard Light Rail Vehicle
US_Standard_Light_Rail_Vehicle
Motor vehicle
control functions, date reminder, trip computer and user-configurable overspeed alarm, as well as diagnostic access to the vehicle's electronic systems
Buick_Reatta
1997 helicopter accident
to the engine overspeed protection system. The splined sleeve disintegrated, severing the high-speed shaft, which led to an overspeed of the right-hand
Helikopter_Service_Flight_451
1994 aircraft accident in Indiana
of the hold and forget they're down we'll get the overspeed," referencing the aural flap overspeed warning that activates if the aircraft speed exceeds
American_Eagle_Flight_4184
Canadian video game company
Racing 2007 Invictus Games Published by City Interactive in Europe as Overspeed: High Performance Speed Racing UTour Golf 2007 Groove Games Not for retail
Groove_Media
Russian cargo airline
separated and moved the low pressure turbine (by design to avoid turbine overspeed) backwards braking on surrounding hardware.[vague][importance?] On July
AirBridgeCargo
1981 Canadian ferry
causing the engine, clutches, and propellers to increase in speed until overspeed safety devices tripped and shut down the entire propulsion system. The
MV_Queen_of_Oak_Bay
Subcompact crossover SUV/Pick-up truck by Dacia
with pedestrian and two-wheeler detection, traffic sign recognition with overspeed alert, lane keep warning and alert, drowsiness monitoring, rear park assist
Dacia_Duster
2000 aviation accident in the Persian Gulf
the approach controller. The first officer alerted the captain to the overspeed condition. With TO/GA thrust and insufficient nose-up attitude for climb
Gulf_Air_Flight_072
Tunisian airline
set the autothrottle to full power, causing the aircraft touched down overspeed, nose-first, and around 600 meters past the touchdown zone. The throttle
Nouvelair
1998 train accident in Jyväskylä, Finland
Jokela rail accident – overspeed through turnout Brühl train disaster – overspeed through turnout Waterfall rail accident – overspeed through sharp curve
Jyväskylä_rail_accident
Maritime patrol and anti-submarine aircraft family
from VP-22 operating from NAS Cubi Point Philippines, had a propeller overspeed shortly after departure. The number 4 propeller then departed the aircraft
Lockheed_P-3_Orion
main engine ran at 60 rpm, this would otherwise have been a disastrous overspeed. Some engines instead used a final pinion on a helical spline, similar
Barring_engine
2021 railway crash in the United Kingdom
acknowledged within 2.5 seconds. TPWS provides, amongst other features, the Overspeed Sensor System (OSS), which can automatically stop a train if it passes
Kirkby_train_crash
Light rail vehicle in use in the UK
middle and end of 2023 saw the introduction of Alstom’s collision and overspeed monitoring and prevention assistance system (COMPAS) being installed on
Flexity_2_(Blackpool)
2011 train derailment in Baby, Piotrków County, Poland
Katowice Operator PKP Intercity Incident type Derailment Cause Disputed: Overspeed caused by driver (PKBWK) Signal fault (driver and Karol Trammer) Statistics
2011_Baby_derailment
Regional airline brand of the US
Archived from the original on September 29, 2007. Retrieved June 26, 2015. "Overspeed and Loss of Power on both Engines During Descent and Power-Off Emergency
American Eagle (airline brand)
American_Eagle_(airline_brand)
Train protection system in North America
system is designed to prevent train-to-train collisions, protect against overspeed, and protect work crews with temporary speed restrictions. The information
Advanced Civil Speed Enforcement System
Advanced_Civil_Speed_Enforcement_System
Form of stress test
initial proof test. Physical overspeed tests may be periodically undertaken on some machines to verify operation of the overspeed protection systems. Operation
Proof_test
Airport. It is reported that one of the engines suffered a propeller overspeed condition. All three crew escaped from the submerged aircraft. 10 March
List of accidents and incidents involving the DC-3 since 2000
List_of_accidents_and_incidents_involving_the_DC-3_since_2000
Disciplined service of the Hong Kong Government
the turbine had begun to overspeed, because there appeared to be no fault in the turbine or the fuel systems the overspeed was possibly the result of
Government_Flying_Service
1968 aviation accident
crew unintentionally pitched the aircraft further down to the point of overspeed while trying to correct the pitch of the aircraft. The "fasten seat belt"
Aeroflot_Flight_15
American actress and film producer
Producer 2018 This Gets Ruff - Producer 2018 Girl Zero - Producer 2019 Overspeed - Producer 2019 Song of Love - Producer 2020 Bill & Ted Face the Music
Kimberley_Kates
Device fitted in modern vehicles that have internal combustion engines
the catalytic converter. These systems usually lean out the engine's overspeed by shutting off the fuel injectors, and are the only practical system
Rev_limiter
British steam locomotive built in 2008
speeds "nearer the 75 mph (121 km/h)" mark. It was stated that while a 10% overspeed is allowed (and may be required) in such new equipment test runs (A4 Class
LNER Peppercorn Class A1 60163 Tornado
LNER_Peppercorn_Class_A1_60163_Tornado
Missile
turbopump, leading to cavitation which caused propellant unloading, pump overspeed, and rupture of low pressure LOX ducting. This then caused the fire that
SM-65C_Atlas
Type of computer disk storage drive
implmenented on some Plextor drives, as well as the ability to force overspeed burning, meaning beyond speed recommended for the media type, for testing
Optical_disc_drive
Principal railway route in Great Britain
onto his line. Grantham rail accident 19 August 1906 14 17 Runaway or overspeed on junction curve causing derailment – no definite cause established.
East_Coast_Main_Line
Helicopter model
carburetor icing concerns in colder temperatures. The 300CBi also includes overspeed protection and automatic rotor engagement during startup, as well as a
Schweizer_S300
Pair of exhibition funny cars
unloading of the front wheels, which in turn caused the front engine to overspeed. Visibility was poor as well due to tire smoke from both ends of the car
Hurst_Hairy_Olds
2016 aviation accident in Sweden
maximum speed (VMO) of 315 knots (583 km/h; 362 mph) was exceeded. The overspeed warning was activated and the vertical acceleration turned to positive
West_Air_Sweden_Flight_294
Abrupt reduction in lift due to flow separation
lead to unreliability of the stall warning and cause the stick pusher, overspeed warning, autopilot, and yaw damper to malfunction. If a forward canard
Stall_(fluid_dynamics)
Type of train protection system
enforced the 50-mile-per-hour (80 km/h) speed limit and prevented the overspeed and subsequent crash of the train. In 2017, another Amtrak derailment
Positive_train_control
Largest Civilian Rotorcraft Manufactured by Airbus Helicopters
incorporates a "blade shedding" system to ensure engine integrity during an overspeed instance. Energy absorbent self-sealing fuel tanks are contained in the
Eurocopter_EC225_Super_Puma
1974 aviation accident in New York
flight to Buffalo. As the craft climbed past 16,000 feet (4,900 m), the overspeed warning horn sounded, followed 10 seconds later by a stick shaker stall
Northwest Orient Airlines Flight 6231
Northwest_Orient_Airlines_Flight_6231
1954 Jack Ridley 48-1385 USAF 1 ? ? Planned powered flight. Turbopump overspeed caused abort. Glide flight. X-1B #2 October 6, 1954 Jack Ridley 48-1385
List_of_X-1B_flights
1998 aviation accident
ATC again asked the flight to confirm their heading, at which point the overspeed warning went off at an airspeed of 245 knots. Observer Cheu yelled again
Formosa_Airlines_Flight_7623
Principal metro system serving Singapore
safe braking distance, and initiate emergency braking in the event of overspeed. The MRT also uses an automatic train supervision system to supervise
Mass Rapid Transit (Singapore)
Mass_Rapid_Transit_(Singapore)
Electric racing car championship
concertinaed through the final turn. As he challenged Heidfeld for third, an overspeed for Gasly caused him to drift into a wall lining the track. He hurled
2016–17 Formula E Championship
2016–17_Formula_E_Championship
Valve that automatically stops the flow of a hazardous fluid in a dangerous event
present in the atmosphere, it can be sucked into a diesel engine causing overspeed or over revving, potentially leading to a catastrophic failure and explosion
Shutdown_valve
2007 aviation accident in the Makassar Strait
final dive, the shotgun-like sounds of engine compressor surges and the overspeed "clacker" can be heard, along with two background voices screaming in
Adam_Air_Flight_574
2008). "Remembering Signal Mountain's Walter Marr". Chattanoogan. SHOW AUTOISTS OVERSPEED.; Bicycle Policemen Capture Three After Long, Hard Chases.
Walter_Lorenzo_Marr
United States Air Force base near Layton, Utah, United States
Arizona to Hill Air Force Base in Ogden, Utah when it developed an engine overspeed issue, complicated by an inability to feather. The aircraft landed at
Hill_Air_Force_Base
North American diesel locomotive class
Ordered with 62:15 gearing with the overspeed set at 72 mph (116 km/h), the gearing was changed to 60:17 (overspeed at 83 mph or 134 km/h) during 1968–1969
EMD_SDP45
Emergency throttle setting on military aircraft
of earlier R-13 powerplants, but with emergency thrust boost from an overspeed to 106% and increased afterburner fuel from a second afterburner fuel
War_emergency_power
Internally commutated electric motor
generator. Since D.C. motor field loss can cause a hazardous runaway or overspeed condition, loss of field relays are connected in parallel with the motor's
Brushed_DC_electric_motor
travel, tourism, insurance
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travel, tourism, insurance