Noar Linhas Aéreas Flight 4896
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On 13 July 2011, Noar Linhas Aéreas Flight 4896, a
Let L-410 Turbolet The Let L-410 Turbolet is a twin-engine short-range transport aircraft designed and produced by the Czech Republic, Czech aircraft manufacturer Aircraft Industries, Let Kunovice (named Aircraft Industries since 2005). It was developed as the ''L ...
passenger aircraft on a domestic service from
Recife Recife ( , ) is the Federative units of Brazil, state capital of Pernambuco, Brazil, on the northeastern Atlantic Ocean, Atlantic coast of South America. It is the largest urban area within both the North Region, Brazil, North and the Northeast R ...
to
Mossoró Mossoró () is a Municipalities of Brazil, Brazilian municipality in the interior of the States of Brazil, state of Rio Grande do Norte, recognized as the capital of the Brazilian semi-arid region. Covering an area of approximately , it is the la ...
, Brazil, crashed shortly after take-off in the Boa Viagem neighbourhood of Recife, after suffering an engine failure. All 16 people on board were killed.


Accident

The aircraft took off from
Recife Airport Recife ( , ) is the Federative units of Brazil, state capital of Pernambuco, Brazil, on the northeastern Atlantic Ocean, Atlantic coast of South America. It is the largest urban area within both the North Region, Brazil, North and the Northeast R ...
's runway 18 at 06:50 local time (09:50
UTC Coordinated Universal Time (UTC) is the primary time standard globally used to regulate clocks and time. It establishes a reference for the current time, forming the basis for civil time and time zones. UTC facilitates international communica ...
) bound for
Augusto Severo International Airport Augusto Severo International Airport , originally called Parnamirim Airport, was the civilian airport that served Natal, Brazil, located in the adjoining municipality of Parnamirim. Starting on November 24, 1951, the airport was named after t ...
,
Natal NATAL or Natal may refer to: Places * Natal, Rio Grande do Norte, a city in Brazil * Natal, South Africa (disambiguation), a region in South Africa ** Natalia Republic, a former country (1839–1843) ** Colony of Natal, a former British colony ( ...
and then
Mossoró Airport Gov. Dix-Sept Rosado Municipal Airport is the airport serving Mossoró, Brazil. Since May 27, 1953 the airport is named after Jerônimo Dix-Sept Rosado Maia (1911-1951), former mayor of Mossoró and Governor of Rio Grande do Norte, who died on a ...
, its final destination. Seconds after lift-off, the left engine lost power, and a minute later the crew issued a
mayday Mayday is an emergency procedure word used internationally as a distress signal in voice-procedure radio communications. It is used to signal a life-threatening emergency primarily by aviators and mariners, but in some countries local organiz ...
call, requesting to return immediately to the airport. The Turbolet climbed to 400 ft while turning to position itself for a landing on the opposite runway 36, but it subsequently started losing altitude. At 06:54, shortly after the crew announced their intention to attempt an
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 ...
on the beach, the aircraft stalled and crashed into an open area of Boa Viagem, between Visconde de Jequitinhonha and Boa Viagem Avenue, approximately from the end of the runway. An intense post-impact fire erupted, consuming most of the wreckage. Both pilots and all fourteen passengers were killed.


Aircraft

The accident aircraft was Let L-410UVP-E20 with registration PR-NOB, built in 2010 as c/n 2722. It was the second purchased by Noar Linhas Aéreas, entering service in June 2010. The L-410 is powered by two M601 turboprop engines produced by Czech manufacturer
Walter Walter may refer to: People and fictional characters * Walter (name), including a list of people and fictional and mythical characters with the given name or surname * Little Walter, American blues harmonica player Marion Walter Jacobs (1930–19 ...
. The M601 is a
free-turbine turboshaft A free-turbine turboshaft is a form of turboshaft or turboprop gas turbine engine where the power is extracted from the exhaust stream of a gas turbine by an independent turbine, downstream of the gas turbine. The power turbine is not mechanicall ...
, where the propeller is driven by a power turbine that is unconnected to the gas generator turbine (sometimes called ''compressor turbine'').


Investigation

An investigation into the accident was opened by the
Aeronautical Accidents Investigation and Prevention Center The Aeronautical Accidents Investigation and Prevention Center (, CENIPA) is a unit of the Brazilian Air Force that investigates aviation accidents and incidents in Brazil. It is headquartered in Brasília. See also * Gol Transportes Aéreos Fl ...
( – CENIPA). In July 2013, the CENIPA published its final report. It found that the left engine failed because a blade in the gas generator turbine had broken off shortly after the airplane lifted off the runway, causing extensive damage to the engine and loss of power. The failure was caused by
metal fatigue In materials science, fatigue is the initiation and propagation of cracks in a material due to cyclic loading. Once a fatigue crack has initiated, it grows a small amount with each loading cycle, typically producing striation (fatigue), striati ...
originating underneath the surface of the blade. A
fluorescent penetrant inspection Fluorescent penetrant inspection (FPI) is a type of dye penetrant inspection in which a fluorescent dye is applied to the surface of a non-porous material in order to detect defects that may compromise the integrity or quality of the part in q ...
carried out during maintenance six months before the accident had not revealed any abnormality. While twin-engine aircraft are normally capable of flying with one engine inoperative, the report identified several factors that prevented the Turbolet from maintaining altitude and speed, including a exceedance in the maximum take-off weight resulting from an error in the software used by the
flight dispatcher A flight dispatcher (also known as an airline dispatcher or flight operations officer) assists in planning flight paths, taking into account aircraft performance and loading, enroute winds, thunderstorm and turbulence forecasts, airspace restric ...
, the insufficient application of right rudder by the pilot flying, and the incomplete execution of the recommended emergency procedure for engine failure at take-off. The report highlighted deficiencies in Noar's training programme for the L-410 aircraft with regard to engine failures at take-off, and also discrepancies between different versions of the aircraft checklists that were available to flight crews. The CENIPA made several safety recommendations to Noar and Let to address such issues, and also to
GE Aviation General Electric Company, doing business as GE Aerospace, is an American aircraft engine supplier that is headquartered in Evendale, Ohio, outside Cincinnati. It is the legal successor to the original General Electric Company founded in 1892, wh ...
, the owner of engine manufacturer Walter, to "reevaluate the method utilized for the exam of the blades."


References


External links


CENIPA Final Report

CENIPA Final report
(in Portuguese)
Archive

Photograph of the wreckage
{{DEFAULTSORT:Noar Linhas Aereas Flight 4896 Aviation accidents and incidents in 2011 2011 disasters in Brazil Accidents and incidents involving the Let L-410 Turbolet Recife Aviation accidents and incidents in Brazil Transport in Pernambuco July 2011 in South America Airliner accidents and incidents caused by engine failure