Quizlet What Prevents Two Systems That Have Already Experienced a Collision From Colliding Again

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GRAND Canyon | TWA Flight 2 and United Airlines Flight 718

Upgrade: Collision avoidance and a meliorate ATC

In the skies higher up the Thou Canyon on June thirty, 1956, two planes that had recently taken off from Los Angeles International Airport—a United Airlines Douglas DC-seven headed to Chicago and a Trans World Airlines Lockheed L-1049 Super Constellation on its fashion to Kansas City—collided. All 128 passengers and crew aboard both flights were killed.

The accident spurred a $250 million upgrade of the air traffic command (ATC) system—serious money in those days. (It worked: There hasn't been a standoff betwixt two airliners in the U.s. in 47 years.) The crash also triggered the creation in 1958 of the Federal Aviation Agency (now Administration) to oversee air prophylactic.

However, further improvements would be implemented afterwards a small-scale private plane wandered into the Los Angeles terminal control expanse on August 31, 1986, striking an Aeromexico DC-9 and killing 86 people. The FAA later required pocket-size shipping entering command areas to use transponders—electronic devices that broadcast position and altitude to controllers.

Additionally, airliners were required to have TCAS 2 standoff-avoidance systems, which observe potential collisions with other transponder-equipped aircraft and advise pilots to climb or dive in response. Since and so, no small plane has collided with an airliner in flying in the U.Southward.

PORTLAND | United Airlines Flight 173

Upgrade: Cockpit teamwork

On December 28, 1978, United Flight 173, a DC-8 approaching Portland, Ore., with 181 passengers, circled near the airdrome for an hour as the crew tried in vain to sort out a landing gear problem. Although gently warned of the rapidly diminishing fuel supply by the flying engineer on lath, the captain—later described by one investigator equally "an big-headed Southward.O.B."—waited besides long to begin his final approach. The DC-eight ran out of fuel and crashed in a suburb, killing ten.

In response, United revamped its cockpit training procedures around the then-new concept of Cockpit Resources Management (CRM). Abandoning the traditional "the helm is god" airline hierarchy, CRM emphasized teamwork and communication among the crew, and has since get the industry standard.

"It's really paid off," says United helm Al Haynes, who in 1989 remarkably managed to crash-land a crippled DC-10 at Sioux City, Iowa, by varying engine thrust. "Without [CRM grooming], it's a sure-fire we wouldn't take made it."

CINCINNATI | Air Canada Flight 797

Upgrade: Lav smoke sensors

The get-go signs of trouble on Air Canada 797, a DC-9 flying at 33,000 feet en road from Dallas to Toronto on June two, 1983, were the wisps of fume wafting out of the rear lavatory. Soon, thick blackness smoke started to fill the cabin, and the aeroplane began an emergency descent. Barely able to see the instrument panel because of the fume, the pilot landed the airplane at Cincinnati. Only shortly later the doors and emergency exits were opened, the cabin erupted in a flash fire before everyone could get out. Of the 46 people aboard, 23 died.

The FAA afterwards mandated that aircraft lavatories be equipped with smoke detectors and automatic fire extinguishers. Within 5 years, all jetliners were retrofitted with burn down-blocking layers on seat cushions and floor lighting to lead passengers to exits in dense fume. Planes built subsequently 1988 take more flame-resistant interior materials.

DALLAS/FORT WORTH | Delta Air Lines Flying 191

Upgrade: Downdraft detection

Equally Delta Flight 191, a Lockheed L-1011, approached for landing at Dallas/Fort Worth airport on August 2, 1985, a thunderstorm lurked virtually the runway. Lightning flashed around the aeroplane at 800 feet, and the jetliner encountered a microburst air current shear—a potent downdraft and abrupt shift in the wind that caused the plane to lose 54 knots of airspeed in a few seconds.

Sinking rapidly, the L-1011 hit the ground near a mile short of the track and bounced across a highway, crushing a vehicle and killing the driver. The airplane and so veered left and crashed into two huge aerodrome h2o tanks. On board, 134 of 163 people were killed.

The crash triggered a vii-year NASA/FAA enquiry effort, which led directly to the on-lath frontward-looking radar current of air-shear detectors that became standard equipment on airliners in the mid-1990s. Only i current of air-shear-related accident has occurred since.

SIOUX CITY | United Airlines Flight 232

Upgrade: Engine safety improvements

United Airlines flying 232 was en route from Denver to Chicago on July 19, 1989 when the engine in the tail of the DC-10 suffered engine failure, severing the airplane's hydraulic lines and rendering the aeroplane virtually uncontrollable. What followed for 296 people aboard was a horrific ordeal as the captain, Alfred Haynes, struggled to land at a nearby drome. As it crash landed, the widebody craft cartwheeled off the runway and caught burn down, and it was considered something of a miracle that 185 passengers aboard survived.

The NTSB later determined the accident was caused past a failure by mechanics to notice a crack in the fan deejay that ultimately was traced back to the initial industry of the titanium blend fabric. The accident led the FAA to order modification of the DC-10's hydraulic organization (the plane was already existence phased out past many airlines) and to require redundant condom systems in all future aircraft, and it changed the mode engine inspections are performed.

MAUI | Aloha Airlines Flight 243

Upgrade: Retiring tin

As Aloha Flying 243, a weary, 19-yr-erstwhile Boeing 737 on a short hop from Hilo, Hawaii, to Honolulu, leveled off at 24,000 ft. on April 28, 1988, a large section of its fuselage blew off, leaving dozens of passengers riding in the open up-air cakewalk. Miraculously, the remainder of the airplane held together long enough for the pilots to land safely. Only one person, a flying attendant who was swept out of the aeroplane, was killed.

The National Transportation Safety Board (NTSB) blamed a combination of corrosion and widespread fatigue harm, the effect of repeated pressurization cycles during the plane's 89,000-plus flights. In response, the FAA began the National Crumbling Aircraft Inquiry Plan in 1991, which tightened inspection and maintenance requirements for loftier-use and high-cycle aircraft.

Mail-Aloha, there has been only ane American fatigue-related jet accident: the Sioux City DC-10.

PITTSBURGH | The states Air Flight 427

Upgrade: Rudder Rx

When US Air Flying 427 began its arroyo to country at Pittsburgh on September 8, 1994, the Boeing 737 suddenly rolled to the left and plunged 5000 feet to the ground, killing all 132 people on board. The plane'southward black box revealed the rudder had abruptly moved to the full-left position, triggering the roll. But why?

USAir blamed the plane. Boeing blamed the crew. It took near five years for the NTSB to conclude a jammed valve in the rudder-control organisation had caused the rudder to reverse: Equally the pilots frantically pressed on the right rudder pedal, the rudder went left.

As a consequence, Boeing spent $500 million to retrofit all 2,800 of the world'due south most pop jetliner. And, in response to conflicts between the airline and the victims' families, Congress passed the Aviation Disaster Family Assistance Deed, which transferred survivor services to the NTSB.

MIAMI | ValuJet Flight 592

Upgrade: Fire prevention in the hold

Although the FAA took anti-cabin-fire measures afterwards the 1983 Air Canada blow, it did zilch to protect rider jet cargo compartments—despite NTSB warnings after a 1988 cargo fire in which the plane managed to land safely. It took the horrific crash of ValuJet 592 into the Everglades near Miami on May 11, 1996 to finally spur the agency to action.

The fire in the DC-9 was acquired past chemical oxygen generators that had been illegally packaged by SabreTech, the airline's maintenance contractor. A bump apparently set one off, and the resulting heat started a fire, which was fed by the oxygen existence given off. The pilots were unable to land the burning plane in time, and 110 people died. The FAA responded by mandating smoke detectors and automatic burn extinguishers in the cargo holds of all commercial airliners. It as well bolstered rules against conveying hazardous cargo on aircraft.

LONG ISLAND | TWA Flight 800

Upgrade: Electrical spark emptying

It was everybody'due south nightmare: a plane that blew up in midair for no credible reason. The July 17, 1996, explosion of TWA Flight 800, a Boeing 747 that had just taken off from JFK jump for Paris, killed all 230 people aboard and stirred keen controversy.

Afterward painstakingly reassembling the wreckage, the NTSB dismissed the possibility of a terrorist flop or missile set on and concluded that fumes in the plane's about empty eye-wing fuel tank had ignited, nigh likely later on a short circuit in a wire bundle led to a spark in the fuel estimate sensor.

The FAA has since mandated changes to reduce sparks from faulty wiring and other sources. Boeing, meanwhile, has adult a fuel-inerting system that injects nitrogen gas into fuel tanks to reduce the chance of explosions. It will install the organisation in all its newly built planes. Retrofit kits for in-service Boeings will too exist bachelor.

NOVA SCOTIA | Swissair Flight 111

Upgrade: Insulation swap-out

About an hr after takeoff on September 2, 1998, the pilots of Swissair's Flight 111 from New York to Geneva—a McDonnell Douglas MD-11—smelled smoke in the cockpit. Four minutes later, they began an immediate descent toward Halifax, Nova Scotia, about 65 miles abroad. But with the burn down spreading and cockpit lights and instruments failing, the plane crashed into the Atlantic about 5 miles off the Nova Scotia coast. All 229 people aboard were killed.

Investigators traced the fire to the airplane's in-flying entertainment network, whose installation led to arcing in vulnerable Kapton wires above the cockpit. The resulting burn spread rapidly along flammable Mylar fuselage insulation. The FAA ordered the Mylar insulation replaced with burn down-resistant materials in about 700 McDonnell Douglas jets.

FROM RIO TO PARIS | Air French republic 447

Upgrade: Manual training to fix over-dependence on automation

Around three hours into its journeying from Rio to Paris on June 1, 2009, Air French republic Flying 447, an Airbus A330-200, headed into an area of severe thunderstorm activeness—it was never heard from again.

From an envelope-pushing altitude of 38,000 feet, the aircraft entered an aerodynamic stall earlier plunging into the depths of the southern Atlantic Ocean, killing all 228 people aboard. Several days later, pieces of the wreckage were spotted floating on the water'southward surface, but the whereabouts of the rest of the jet remained a mystery for more than than two years, when a privately funded search located the bulk of the fuselage, bodies of the victims, and the vital black box recorders.

Investigators had already solved role of the puzzle, relying on automated messages sent from the bedridden plane as it went downwardly, revealing that the pitot tubes that rail speed had frozen and malfunctioned, setting off a cascading series of events.

With the wreckage now establish, the evidence led experts to conclude the crash was caused by the pilots' failure to take corrective action to recover from the stall.

The findings cast a harsh light on fly-past-wire engineering and its reliance on computers, rather than humans, to make the final call on flying decisions. Boeing and Airbus both apply fly past wire, but Boeing gives pilots the ability to override automation. The crash prompted a renewed attempt to retrain pilots to manually wing the plane–no matter what the estimator is telling them.

Verbal LOCATION UNKNOWN | Malaysia Airlines 370

Upgrade (pending): Real-fourth dimension flying tracking

In that location was no May Twenty-four hour period call or sign of trouble when Malaysia Airlines Flight 370, a 777 carrying 239 people en route from Kuala Lumpur to Beijing, dropped off the radar screens on March 8, 2014. More than 7 years later on, it's still aviation'due south most agonizing mystery.

The biggest question: why the plane'due south transponders were apparently disabled, making the jet most invisible as information technology unaccountably changed course and headed s, where some experts believe it flew for upwards to seven hours on autopilot before running out of fuel and crashing into the Indian Sea.

In the absenteeism of hard evidence—with few clues in the form of some barnacled flotsam found off Africa–many competing theories of what happened take arisen, from hypoxia caused by rapid decompression (also the cause of the Helios Flight 522 crash in Hellenic republic), to intentional sabotage from a crew member or passenger.

One thing is articulate: the world wouldn't however exist looking for the plane if information technology had been equipped with existent-fourth dimension tracking, which prophylactic experts had been demanding ever since Air French republic 447. As a result of MH370, the International Ceremonious Aviation Organisation has ordered all airlines to install tracking equipment that will keep closer tabs on planes, especially those over the ocean, and shipping manufacturers are besides developing black boxes that would eject and float automatically when a plane hits h2o.

Indonesia and ETHIOPIA | Lion Air 610 and Ethiopian Airlines 302

Upgrade (Pending): Flight Control System on Boeing's 737 MAX 8 gets an update.

On October 29, 2018, Lion Air Flight 610, a Boeing 737 MAX 8, plummeted into the Java sea thirteen minutes after it took off from Soekarno–Hatta International Airdrome in Djakarta, Indonesia. In the weeks post-obit the crash, officials discovered the Pangkal Pinang-spring flying suffered flight control issues linked, in part, to a flaw in the new aircraft's Maneuvering Characteristics Augmentation Arrangement (MCAS). The system, which mistakenly pushed the plane's nose down despite the pilots' all-time efforts to correct information technology.

Five months later, Ethiopian Airlines Flight 302—en road to Nairobi, Kenya, from Addis Ababa, Ethiopia—crashed but vi minutes later on take-off. Investigations revealed the Boeing 737 MAX 8 suffered a similar fate as Flight 610. Between the two accidents, 346 people perished.

In the wake of the two incidents, the FAA and Boeing grounded all 737 MAX viii jets to fully investigate the aircraft, right wiring issues and repair the flight control system and allow pilots to receive more training on the aircraft.

In November 2020, the MAX was deemed rubber enough to fly. But its troubles are far from over. In Apr 2021, Boeing issued a statement ordering the grounding of around 160 MAX 8 jets to accost yet another software issue.

Barbara Peterson Author Barbara Peterson is a journalist living in New York, who writes often about aviation.

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Source: https://www.popularmechanics.com/flight/g73/12-airplane-crashes-that-changed-aviation/

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