Accident
Last updated: 23 November 2014
Estado:Final
Fecha:miércoles 20 septiembre 1989
Hora:23:21
Tipo:Silhouette image of generic B734 model; specific model in this crash may look slightly different
Boeing 737-401
Operador:USAir
Registración: N416US
Numéro de série: 23884/1643
Año de Construcción: 1988-12-09 (10 months)
Horas Totales de la Célula:2235
Ciclos:1730
Motores: 2 CFMI CFM56-3B2
Tripulación:Fatalidades: 0 / Ocupantes: 6
Pasajeros:Fatalidades: 2 / Ocupantes: 57
Total:Fatalidades: 2 / Ocupantes: 63
Daños en la Aeronave: Destruido
Consecuencias: Written off (damaged beyond repair)
Ubicación:New York-La Guardia Airport, NY (LGA) (   Estados Unidos de América) show on map
Elevación del lugar del accidente: 7 m (23 feet) amsl
Fase: Despegue (TOF)
Naturaleza:Vuelo Doméstico Programado
Aeropuerto de Salida:New York-La Guardia Airport, NY (LGA/KLGA), Estados Unidos de América
Aeropuerto de Llegada:Charlotte-Douglas Airport, NC (CLT/KCLT), Estados Unidos de América
Número de Vuelo:5050
Descripción:
USAir flight 1846 was scheduled to departure from Baltimore/Washington (BWI) at 15:10, but air traffic inbound to New York-LaGuardia (LGA) delayed the takeoff until 19:35. Holding on the taxiway at BWI for 1.5 hours required the flight to return to the terminal area for fuel. The Boeing 737-400 left BWI uneventfully and arrived at LGA's Gate 15 at 20:40.
Weather and air traffic in the LGA terminal area had caused cancellations and delayed most flights for several hours. The USAir dispatcher decided to cancel the Norfolk leg of Flight 1846, unload the passengers, and send the flight to Charlotte (CLT) without passengers. Several minutes later, the dispatcher told the captain that his airplane would not be flown empty but would carry passengers to Charlotte as USAir flight 5050. This seemed to upset the captain. He expressed concern for the passengers because more delays would cause him and the first officer to exceed crew duty time limitations before the end of the trip. While passengers were boarding, the captain visited USAir's ground movement control tower to ask about how decisions were made about flights and passengers.
The captain returned to the cockpit as the last of the passengers were boarding, and the entry door was closed. After the jetway was retracted, the passenger service representative told the captain through the open cockpit window that he wanted to open the door again to board more passengers. The captain refused, and flight 5050 left Gate 15 at 22:52.
The 737 taxied out to runway 31. Two minutes after push-back, the ground controller told the crew to hold short of taxiway Golf Golf. However, the captain failed to hold short of that taxiway and received modified taxi instructions from the ground controller at 22:56. The captain then briefed takeoff speeds as V1: 125 knots, VR: 128 knots, and V2: 139 knots. The first officer was to be the flying pilot. About 2 minutes later, the first officer announced "stabilizer and trim" as part of the before-takeoff checklist. The captain responded with "set" and then corrected himself by saying: "Stabilizer trim, I forgot the answer. Set for takeoff."
Flight 5050 was cleared into position to hold at the end of the runway at 23:18:26 and received takeoff clearance at 23:20:05. The first officer pressed the autothrottle disengage and then pressed the TO/GA button, but noted no throttle movement. He then advanced the throttles manually to a "rough" takeoff-power setting. The captain then said: "Okay, that's the wrong button pushed" and 9 seconds later said: "All right, I'll set your power." During the takeoff roll the airplane began tracking to the left. About 18 seconds after beginning the roll a "bang" was heard followed shortly by a loud rumble. At 23:20:53, the captain said "got the steering." The captain later testified that he had said, "You've got the steering." The first officer testified that he thought the captain had said: "I've got the steering." When the first officer heard the captain, he said "Watch it then" and began releasing force on the right rudder pedal but kept his hands on the yoke in anticipation of the V1 and rotation callouts.
At 23:20:58.1, the captain said: "Let's take it back then" which he later testified meant that he was aborting the takeoff. According to the captain, he rejected the takeoff because of the continuing left drift and the rumbling noise. He used differential braking and nose wheel steering to return toward the centerline and stop. The throttle levers were brought back to their idle stops at 23:20:58.4. The indicated airspeed at that time was 130 knots. Increasing engine sound indicating employment of reverse thrust was heard on the CVR almost 9 seconds after the abort maneuver began. The airplane did not stop on the runway but crossed the end of the runway at 34 knots ground speed. The aircraft dropped onto the wooden approach light pier, which collapsed causing the aircraft break in three and drop into 7-12m deep East River.


PROBABLE CAUSE: "The captain's failure to exercise his command authority in a timely manner to reject the take-off or take sufficient control to continue the take-off, which was initiated with a mistrimmed rudder. Also causal was the captain's failure to detect the mistrimmed rudder before the take-off was attempted."
Board member Jim Burnett filed the following concurring and dissenting statement: "Although I concur with the probable cause as adopted as far as it goes, I would have added the following as a contributing factor: Contributing to the cause of the accident was the failure of USAir to provide an adequately experienced and seasoned flight crew."

Fuentes:
» Aviation Week & Space Technology 2.10.89 (32,33)
» NTSB/AAR-90/03

Official accident investigation report
investigating agency: National Transport Safety Bureau (NTSB) - United States of America
report status: Final
report number: NTSB/AAR-90-03
report released:03-JUL-1990
duration of investigation:286 days (9.5 months)
download report: USAIR, Inc., Boeing 737-400 LaGuardia Airport Flushing, New York September 20, 1989. (NTSB/AAR-90-03)

Subsiguiente / acciones de seguridad

NTSB issued 6 Safety Recommendations

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Fotos

photo of Boeing 737-401 N416US
photo of Boeing 737-401 N416US
photo of Boeing 737-401 N416US
photo of Boeing 737-401 N416US
Piedmont was integrated into USAir in 1989
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Map
This map shows the airport of departure and the intended destination of the flight. The line between the airports does not display the exact flight path.
Distance from New York-La Guardia Airport, NY to Charlotte-Douglas Airport, NC as the crow flies is 869 km (543 miles).

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Boeing 737-400

  • 2nd loss
  • 486 built
  • 2nd worst accident (a la hora)
  • 6th worst accident (actualmente)
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 Estados Unidos de América
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  • 984th worst accident (actualmente)
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