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| Title: | Landed short, Iberia Lineas Aereas De Espana (Iberian Airlines), McDonnell Douglas DC-10-30, EC-CBN, Logan International Airport, Boston, Massachusetts, December 17, 1973 |
| Micro summary: | This McDonnell Douglas DC-10-30 landed short of the runway. |
| Event Time: | 1973-12-17 at 1543 EST |
| File Name: | 1973-12-17-US.pdf |
| Publishing Agency: | National Transportation Safety Board (NTSB) |
| Publishing Country: | USA |
| Report number: | NTSB-AAR-74-14 |
| Pages: | 33 |
| Site of event: | Landing RWY 33L |
| Latitude/Longitude: | N42°21'48" W071°00'18" |
| Departure: | Madrid Barajas International Airport, Madrid, Spain |
| Destination: | General Edward Lawrence Logan International Airport, Boston, Massachusetts, USA |
| Airplane Type(s): | McDonnell Douglas DC-10-30 |
| Flight Phase: | Landing |
| Registration(s): | EC-CBN |
| Operator(s): | Iberia |
| Type of flight: | Revenue |
| Occupants: | 167 |
| Fatalities: | 0 |
| Serious Injuries: | 16 |
| Minor/Non-Injured: | 151 |
| Other Injuries: | 0 |
| Executive Summary: | About 1543 EST on December 17, 1973, Iberia Lineas Aereas de Espana Flight 933, a DC-10-30, crashed while making an instrument landing system approach to runway 33L at Logan International Airport, Boston, Massachusetts. Thirteen passengers were injured slightly; two passengers and one flight attendant were injured seriously during evacuation. The aircraft was substantially damaged. The aircraft first struck approach light piers about 500 feet short of the threshold of the runway. The aircraft then struck an embankment and sheared its right main landing gear. The aircraft skidded to a stop on the airport about 3,000 feet beyond the threshold and 280 feet north of runway 33L. A t the time of the accident, low ceilings with obscurations and a visibility of 3/4 mile in rain and fog prevailed at Logan Airport. The National Transportation Safety Board determines that the probable cause of this accident was that 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 a lowaltitude 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. As a result of this accident, the National Transportation Safety Board made eight recommendations to the Federal Aviation Administration. |
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