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词条 Independent Air Flight 1851
释义

  1. Aircraft and crew

      Aircraft    Crew  

  2. Investigation

      Conclusions  

  3. Lawsuit

  4. References

  5. Further reading

  6. External links

{{Use dmy dates|date=July 2014}}{{refimprove|date=November 2018}}{{Infobox aircraft occurrence
| name = Independent Air Flight 1851
| image = Independent Air - Skylarks Boeing 707-331B N7231T (26022307271).jpg
| image_size =
| alt =
| caption = N7231T, the aircraft involved seen 4 years before the accident
| occurrence_type = Accident
| date = 8 February 1989
| summary = Controlled flight into terrain due to pilot error and ATC error
| site = Pico Alto,
{{nowrap|Santa Maria Island, Azores}}
| coordinates = {{coord|36.981475|-25.091008|type:event|display=inline,title}}
| aircraft_type = Boeing 707-331B
| aircraft_name =
| operator = Independent Air
| tail_number = {{Airreg|N|7231T}}
| origin = Orio al Serio Airport, Bergamo, Italy
| stopover = Santa Maria Airport,
Santa Maria, Azores
| stopover0 =
| last_stopover =
| destination = Punta Cana,
Dominican Republic
| passengers = 137
| crew = 7
| fatalities = 144
| injuries =
| missing =
| survivors = 0
| occupants = 144
}}

On 8 February 1989, Independent Air Flight 1851, a Boeing 707 on an American charter flight from Bergamo, Italy to Punta Cana, Dominican Republic, struck Pico Alto while on approach to Santa Maria Airport in the Azores for a scheduled stopover. The aircraft was destroyed, with the loss of all 144 on board, resulting in the deadliest plane crash in Portugal's history. Due to the large number of tourists from Italy that perished in this tragedy, it is known in this country as Il disastro delle Azorre” (Italian for “The disaster of the Azores”).

Aircraft and crew

Aircraft

The aircraft was a 19-year-old Boeing 707 (Serial no. 19572, factory no. 687) that had been built in 1968, and made its first flight on 22 March the same year. It had been previously operated by Trans World Airlines (TWA).[1]

Crew

The flight crew consisted of Captain Leon James Daugherty, 41-year-old, first officer Sammy Adcock, 36, and flight engineer Jorge Gonzalez, 34.[2]

Daugherty had 7,766 flying hours, including 766 hours on the Boeing 707 (278 as first officer and 488 hours as captain, respectively). He also had 2,259 hours on the Boeing 727 (347 hours as first officer and 1,912 hours as captain, respectively).[3]

Adcock had a total of 3,764 flying hours, including 64 hours in the Boeing 707. Gonzalez had a total of 6,756 flying hours, including 1,056 hours on the Boeing 707, He also had 2,888 hours on the Boeing 727 and 2,823 hours on the Lockheed C-5 Galaxy.[3]

Investigation

The official investigation determined that during approach to Santa Maria Airport, the air traffic controller instructed the crew to descend to {{convert|3000|ft|m}} for an ILS approach to runway 19.[3]

During that transmission, a trainee controller had also transmitted an incorrect QNH (barometric altimeter setting) that was 9 hPa too high. The approach instructions were not fully heard since the pilot had re-keyed his microphone to acknowledge the new QNH, and likely did not hear the second repeat of the 3,000 ft safe altitude, declaring: "We’re re-cleared to 2,000 feet..." (610 m). Although the first officer questioned the barometric altitude, the captain agreed that the first officer had heard the read-back correctly.

After having been cleared to the ILS approach, the crew failed to accomplish the approach briefing, missing an opportunity to notice the 3,000 ft minimum safe altitude and the presence of Pico Alto.

Leveling off at {{convert|2000|ft|m}}, the airliner experienced heavy turbulence near Santo Espírito and subsequently impacted the ridge of Pico Alto in a level attitude at an altitude of {{convert|1795|ft|m}}. There was no evidence of any in-flight emergency and the altimeter was found correctly set to 1027 mb.

Conclusions

The Board of Inquiry concluded that the accident was due to non-observance by the crew of established operating procedures which led to the deliberate descent of the aircraft to 2000 feet when the published minimum sector altitude was 3000 feet. It also found that the controller had put the aircraft {{convert|240|ft|m}} below that indicated on board the aircraft, exacerbating the original error by the first officer.[3]

Other factors:

  • Bad communications techniques on the part of the co-pilot and controller, including the non-adherence to standard phraseology in some of the ground communication.
  • Neglecting aerodrome control tower procedures in not requesting a readback of the descent clearance.
  • The limited international flying experience of the crew and the airline's deficient crew training that did not include emergency maneuvering techniques for terrain avoidance.
  • Non-compliance with the National Institute of Civil Aviation of Portugal Aeronautical Information Publications (flight plan procedures and authorized routes).

Lawsuit

In 1992, a group of next-of-kin claimed Independent Air and the lessor of the aircraft, International Air Leases, were responsible for the loss of their relatives and wanted to be compensated. In the court cases that followed, Independent Air was judged to be negligent based on the following statement: "undisputed facts show that the pilot and crew flew the plane below an altitude of 3,000 feet, when their charts of the area clearly showed that it was dangerous to go below 3,000 feet because of the mountain. The pilot in command cannot excuse his act by alleging the air traffic controller directed him to descend to an altitude of 2,000 feet and gave him an incorrect altimeter setting. In descending below the safe indicated altitude, he knowingly placed the plane in a dangerous situation. He then proceeded to fly into the top of the mountain that he knew was there".[4] The case was settled for $34,000,000.[5]

References

1. ^{{Cite web|url=https://web.archive.org/web/20131203005359/http://jetphotos.net/census/aircraft2.php?msnid=707-19572|title=JetPhotos.Net » Aircraft Census Database » CN 19572 Boeing 707-331B N7231T|website=web.archive.org|access-date=2018-11-20}}
2. ^{{cite news |last1=New York Times |title=Charter Jet Crash in Azores Kills 144 |url=https://www.nytimes.com/1989/02/09/world/charter-jet-crash-in-azores-kills-144.html |agency=Associated Press |publisher=New York Times |date=1989-02-09}}
3. ^{{cite magazine|first=Thomas A. |last=Duke |url=http://flightsafety.org/ap/ap_feb95.pdf |title=Aircraft Descended Below Minimum Sector Altitude and Crew Failed to Respond to GPWS as Chartered Boeing 707 Flew into Mountain in the Azores |publisher=Flight Safety Foundation |magazine=Accident Prevention |date=February 1995 |volume=52 |issue=2 |deadurl=no |archiveurl=https://www.webcitation.org/6CE4VrSZp?url=http://flightsafety.org/ap/ap_feb95.pdf |archivedate=16 November 2012 |df=dmy-all }}
4. ^{{cite web|title=Independent Air vs Tosini|url=http://www.leagle.com/decision/1992603600So2d3_1601/INDEPENDENT%20AIR,%20INC.%20v.%20TOSINI}}
5. ^{{cite web|title=Spenser & Krause – Our Work and Past cases|url=http://speiserkrause.com/lawyer/Our-Work-and-Past-Cases_cp14522.htm}}
  • {{citation|author=UK CAA|title=CAA Document 429: World Airline Accident Summary|publisher=ICAO|date=April 1976}}

Further reading

  • {{cite book |last1=Cunha |first1=Francisco |title=IDN 1851 – The Santa Maria Air Disaster |date=2019 |isbn=978-989-20-8959-1 |url=https://independentair1851book.wordpress.com/about-this-book/}}

External links

  • {{ASN accident|id=19890208-0}}
  • Photos of N7231T at Airliners.net
  • [https://web.archive.org/web/20090219091919/http://dnausers.d-n-a.net/dnetGOjg/080289.htm Independent Air Boeing 707 CVR Readout]
{{Aviation accidents and incidents in Portugal}}{{Aviation incidents and accidents in 1989}}

9 : Aviation accidents and incidents in 1989|Airliner accidents and incidents involving controlled flight into terrain|Airliner accidents and incidents caused by pilot error|Aviation accidents and incidents caused by air traffic controller error|Aviation accidents and incidents in Portugal|Accidents and incidents involving the Boeing 707|Independent Air accidents and incidents|1989 in Portugal|February 1989 events

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