Iberia Flight 933

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Iberia Flight 933
DC- 10 Iberia.jpg
EC-CBN, the aircraft involved
Accident
DateDecember 17, 1973 (1973-12-17)
Summary Pilot error leading to spatial disorientation
Site Logan International Airport, Boston, Massachusetts, United States
42°21′48″N71°0′18″W / 42.36333°N 71.00500°W / 42.36333; -71.00500
Aircraft
Aircraft type McDonnell Douglas DC-10-30
Aircraft nameCosta Brava
Operator Iberia Airlines
IATA flight No.IB933
ICAO flight No.IBE933
Call signIBERIA 933
Registration EC-CBN
Flight origin Madrid Barajas International Airport, Madrid, Spain
Destination Logan International Airport, Boston, Massachusetts, United States
Occupants168
Passengers154
Crew14
Fatalities0
Injuries13 (3 serious)
Survivors168

Iberia Flight 933 was an international flight from Madrid Barajas International Airport bound for its destination, Boston-Logan International Airport in Boston that suffered a crash landing on December 17, 1973. As the McDonnell Douglas DC-10 operating the flight was approaching the airport, it collided with the approach lighting system (ALS) 500 feet (152 m) short of the runway threshold. The impact broke off the right main landing gear. The aircraft became airborne for about 1,200 feet (370 m), then landed on runway 33 Left, veered to the right off the runway and came to rest. All 168 on board survived, but the plane was written off. This accident was the first hull loss of the DC-10. [1]

Contents

Background

Aircraft

The aircraft involved was a McDonnell Douglas DC-10-30, manufactured in early 1973 by McDonnell Douglas at Long Beach Airport, California. At the time of the accident, it was nine months old and flown a total of 2,016 flight hours. It was registered as N54627 during a certification test but re-registered as EC-CBN when it was delivered to Iberia Airlines in August 1973. [2] Once, it was photographed previously for Iberia Airlines postcards and merchandise. [3] [4]

Crew

The cockpit crew consisted of Captain Jesus Calderón Gaztelu (age 53), First Officer Alfredo Perez Vega (54), Flight Engineer Celedonio Martin Santos (42), and Radio Operator/Navigator Candido Garcia Bueno (51). Captain Calderón was hired in 1953 and had 21,705 flight hours, including 426 hours in the DC-10. First Officer Perez was hired in 1946 and had 34,189 hours, including 403 hours in the DC-10. Flight Engineer Martin was hired in 1952 and had 15,317 hours of flight time, including 263 hours in the DC-10. Radio Operator/Navigator Garcia was hired in 1941 and had 14,562 hours, including 384 hours in the DC-10. [5]

Investigation

The National Transportation Safety Board (NTSB) investigated the accident. According to the aircraft's flight data recorder, the descent rate was increasing too rapidly during the approach, the result of a wind shear encounter. The investigation found that the captain and the first officer failed to recognize the rate change until the aircraft collided with the ALS piers. It was also discovered that the changes in weather had directed their attention away from monitoring the descent rate. Eleven months after the accident, the NTSB issued its conclusion on the probable cause of the crash. [6] In its accident report the NTSB stated: "The captain did not recognize and may have been unable to recognize, an increased rate of descent in time to arrest it before the aircraft struck the approach light piers. The increased rate of descent was induced by an encounter with low-level wind shear at a critical point in the landing approach where he was transitioning from automatic flight control under instrument flight conditions to manual flight control with visual references. The captain's ability to detect and arrest the increased rate of descent was adversely affected by a lack of information as to the existence of the wind shear and the marginal visual cues available. The minimal DC-10 wheel clearance above the approach lights and the runway threshold afforded by the ILS glide slope made the response time critical and, under the circumstances, produced a situation wherein a pilot's ability to make a safe landing was greatly diminished." [7]

The DC-10 had eight emergency exits, but after the crash, only four could be operated. The number 1 right exit had a fault in the mechanism and could not be opened. Due to the weak floor at the end of the aircraft, the floor had become deformed, causing failures in multiple-seat tracks and restraints, and also destroyed the two emergency exits at the back of the aircraft. This meant that the passengers in the back had to climb out of the section through the roof that had broken and jump off onto the ground, causing even more injuries. [8] Due to the floor disintegrating, rock and mud were thrown into the rear compartment of the aircraft.

The parts of the floor that had broken apart were between fuselage stations (sections in the aircraft fuselage) 1530 to 1850. Compared to American Airlines Flight 96, stations 1801 to 1921 had failed. [9] The same floor section had collapsed in both accidents.

Aftermath

The NTSB issued seven safety recommendations to the Federal Aviation Administration on September 6, 1974. [5] All of them were closed and with acceptable action.

EC-CBN was damaged beyond repair and written off two months later. It was scrapped in 1974.

See also

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References

  1. ↑ Ranter, Harro. "ASN Aircraft accident McDonnell Douglas DC-10-30 EC-CBN Boston-Logan International Airport, MA (BOS)". aviation-safety.net. Aviation Safety Network . Retrieved 2020-12-13.
  2. ↑ "Iberia EC-CBN (McDonnell Douglas DC-10 - MSN 46925)". www.airfleets.net. Airfleets aviation. Retrieved 2018-02-09.
  3. ↑ "EC-CBN: El breve "Costa Brava" *" . Retrieved 2018-02-09.
  4. ↑ "Iberia McDonnell Douglas DC-10 (postcard)". Flickr. Retrieved 2018-02-09.
  5. 1 2 "Aircraft Accident Report - Iberian Lineas Aereas De Espana (Iberian Airlines), McDonnell Douglas DC-10-30, EC CBN, Logan International Airport, Boston, Massachusetts, December 17, 1973" (PDF). National Transportation Safety Board. November 8, 1974. Retrieved 21 September 2021.
  6. ↑ "Event Details". www.fss.aero. Retrieved 2018-02-09.
  7. ↑ "MC DONNELL - DOUGLAS DC - 10 - Accident of EC-CBN (46925/87)". www.taxiways.de. Retrieved 2018-02-09.
  8. ↑ Godson, John (1975). The rise and fall of the DC-10. D. McKay Co. p. 193. ISBN   0679505288. OCLC   1245951.
  9. ↑ Godson, John (1975). The rise and fall of the DC-10. D. McKay Co. p. 196. ISBN   0679505288. OCLC   1245951.
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