Independent Air Flight 1851

Last updated

Independent Air Flight 1851
Independent Air - Skylarks Boeing 707-331B N7231T (26022307271).jpg
N7231T, the aircraft involved, seen at Amsterdam Schiphol Airport in 1985 in a previous livery
Accident
Date8 February 1989
Summary Controlled flight into terrain during descent
SitePico Alto,
Santa Maria Island, Azores
36°58′53″N25°05′28″W / 36.981475°N 25.091008°W / 36.981475; -25.091008
Aircraft
Aircraft type Boeing 707-331B
Operator Independent Air
IATA flight No.ID1851
ICAO flight No.IDN1851
Call signINDEPENDENT 1851
Registration N7231T [1]
Flight origin Orio al Serio Airport, Bergamo, Italy
Stopover Santa Maria Airport,
Santa Maria, Azores, Portugal
Destination Punta Cana Airport,
Dominican Republic
Occupants144
Passengers137
Crew7
Fatalities144
Survivors0

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 people on board, resulting in the deadliest plane crash in Portugal's history. [2] All of the passengers on board were Italian and all of the crew were Americans. [3] [4] The crash is also known as "The disaster of the Azores" (Italian : Il disastro delle Azzorre). [5]

Contents

Aircraft and crew

The aircraft was a 21-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) [6] and was one of two 707s in the airline's fleet. [7]

The flight crew consisted of Captain Douglas Leon Daugherty (41), First Officer Samuel "Sammy" Adcock (36), and Flight Engineer Jorge Gonzalez (34). [8]

Captain Daugherty had 7,766 flight hours, including 766 hours on the Boeing 707 (278 as a first officer and 488 hours as a captain). He also had 2,259 hours on the Boeing 727 (347 hours as a first officer and 1,912 hours as a captain). [9]

First Officer Adcock had a total of 3,764 flight hours, though only 64 of them on the Boeing 707. Flight Engineer 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. [9]

One of the flight attendants on board, Yvette Murray (26), was engaged to Captain Daugherty, planning to get married in May. [10] [11]

Sequence of events

Preceding events

The flight crew previously flew on 3 February to Montego Bay, Jamaica. On 4 February they flew to Fort Worth, Texas, then to Denver, Colorado. On 5 February, the crew returned to Montego Bay, where they received their assignment for flight 1851 from Milan, Italy, to Punta Cana, Dominican Republic, with a scheduled stopover in Santa Maria, Azores, Portugal. On 7 February, after a flight of 10 hours and 40 minutes, the crew arrived in Genoa, Italy, having to divert from Milan Malpensa Airport due to poor weather. The crew arrived in Bergamo three hours later, which was located near the planned departure airport. The crew spent the next 46 hours in a hotel, their activities being unknown. However, in the early morning of 9 February, a witness stated that everyone left the hotel in a good mood. [9]

Departure was scheduled for 08:00 GMT, but because of fog, the aircraft was delayed in Genoa and was able to land at Orio al Serio Airport in Bergamo only at 07:20. According to the flight plan, the duration of the first part of the flight was to be 4 hours and 10 minutes, landing on runway 33. It is also worth noting that in terms of flight, the airport coordinates were given as 36756 North (latitude) and 025096 West (longitude), with the runway elevation being 0 feet. But the coordinates indicated did not correspond to either the charts nor any of the aircraft's navigation equipment, and the actual level of the airfield is 305 feet (93 m). Also during the investigation it was noted that the air navigation charts for this airport were outdated by 27 years, with the last update having been on 1 February 1962. [9]

At 10:04, Flight 1851 departed Bergamo Airport. [9]

Accident

Flight 1851 had communication difficulties with air traffic controllers at high frequencies (HF), although it worked without failures on the ground. At 12:46:33, the crew contacted the Santa Maria Air Traffic Control center and reported on the passage point 38°N20°W / 38°N 20°W / 38; -20 . Flight 1851 was handled by a trainee air traffic controller. [9] As the investigators later noted, phraseology was violated during the communications. The controller also used the word "point" instead of "decimal", meaning a decimal point. Radio communication with the land was conducted mainly by first officer Adcock, with the exception at 13:43:57 when flight engineer Gonzalez requested a weather report. [9] At 13:44:20 the controller transmitted: "One eight five one wind two six zero... Fourteen ah fourteen knots maximum two four knots visibility more than ten kilometers one octa at one two zero zero feet six octa at three thousand feet ah temperature one seven QNH one zero one niner." During the transmission, the controller used non-standard terminology "at" in the sentence, "one octant for one two zero zero." Due to the communication difficulties, the crew heard the message as "one octant two two zero zero," from which they falsely determined that there were no clouds below 2,000 feet. [9]

At 13:56:47, when flight 1851 was performing a descent to the airfield and passing 6,705 meters (21,998 ft), the controller dispatched: "Independent Air one eight five one roger you're cleared to three thousand feet on QNH one zero two seven and ah runway will be one niner." The controller made a major error during this transmission. He had reported to the crew the pressure of 1027 hPa, when it was actually 1018.7, (rounded 1018), which is 9 hPa lower. The instructor noticed this and wanted to transmit the correct information to the crew, but he was distracted by a phone call. Also, the crew members themselves failed to notice the transfer of high pressure, which 12 minutes earlier was much lower. This could have been facilitated by the presence of a flight attendant in the cockpit, whose voice was recorded by the Cockpit Voice Recorder (CVR) at 13:48:30 and at 14:04:09. [9]

View of Pico-Alto SMA VPO Pico Alto.JPG
View of Pico-Alto

At 13:56:59 the co-pilot told the controller: "We're cleared to two thousand feet and ah...," but paused mid-sentence at 13:57:02. At that same time Daugherty said, "Make it three [thousand]." Then 13:57:07 Adcock continued his radio transmission: "one zero two seven." This was the last transmission from Flight 1851, but the controller did not hear the first part, as he continued to say that the flight would be landing on runway 19, and therefore did not know that the plane continued to descend to 2,000 feet (610 m). As this was below the minimum safe altitude of 3,000 feet (910 m), the aircraft was flying straight to the mountain. [9]

At 14:02, at a speed of 260 knots (480 km/h; 300 mph), the plane passed a height of 5,000 feet (1,500 m) and got into a zone of light turbulence. At 14:03 Adcock stated, "Ah after two thousand yeah we'll get below these clouds." At 14:06 at a speed of 250 knots (460 km/h; 290 mph), and at a height of 2,000 feet (610 m) the aircraft encountered heavy turbulence near Santo Espírito, with Daugherty saying at 14:07:52, "Can't keep this son of a bitch thing straight up and down." Adcock asked Daugherty if he needed help, but he replied, "no." Then at 14:08:00 due to the turbulence, the aircraft climbed sharply from 1,751 feet (534 m) to 1,869 feet (570 m). As a result radio altimeter then gave a warning signal and then the Ground Proximity Warning System (GPWS) activated, sounding several "whoop whoop pull up" audible alarms, but the crew did not respond to warnings. [9]

At 14:08:12, at an actual altitude of 1,795 feet (547 m) above sea level, the aircraft crashed into a wall by a road, skidded through trees with trunks about 30–40 centimeters (12–16 in) in diameter, and exploded. The impact occurred on the east side of the mountain. The majority of debris was on this side of the mountain, though several portions of debris were also found on the western slope of the mountain as the initial impact site was near the summit. [9] All 144 people (7 crew members and 137 passengers) on board were killed. This is the deadliest aviation disaster to occur in Portugal and the fourth deadliest involving a Boeing 707. [2] [12]

Investigation

Flight 1851 Memorial Pico alto mon voo 1851 (5).JPG
Flight 1851 Memorial

The altimeters found at the crash site had an exhibited pressure of 1028 and 1026 hPa, and their height read 2,000 feet (610 m). The overestimation of pressure by 9 hPa led to an overestimation of readings by 240 feet (73 m), but taking into account the distance to the summit and the height of trees growing on the mountain, it was concluded that this difference did not contribute to the accident. [9]

The official investigation determined that during approach to Santa Maria Airport, the air traffic controller instructed the crew to descend to 3,000 feet (910 m) for an ILS approach to runway 19. [9]

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 2,000 feet (610 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 1,795 feet (547 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 2,000 feet (610 m) when the published minimum sector altitude was 3,000 feet (910 m). It also found that the controller had put the aircraft 240 feet (73 m) below that indicated on board the aircraft, exacerbating the original error by the first officer. [9]

Other factors:

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 sought compensation. In the court cases that followed, Independent Air was judged to have acted negligently 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".

The case was settled for $34,000,000. [13] [14]

The crash was featured in season 23, episode 2 of the Canadian documentary series Mayday , titled "Mixed Signals". [15]

Related Research Articles

<span class="mw-page-title-main">Flight level</span> Measure in aviation

In aviation and aviation meteorology, a flight level (FL) is an aircraft's altitude at standard air pressure, expressed in hundreds of feet. The air pressure is computed assuming an International Standard Atmosphere pressure of 1013.25 hPa (29.92 inHg) at sea level, and therefore is not necessarily the same as the aircraft's actual altitude, either above sea level or above ground level.

<span class="mw-page-title-main">Aeroperú Flight 603</span> 1996 aviation accident

Aeroperú Flight 603 (PL603/PLI603) was a scheduled passenger flight from Miami International Airport in Miami, Florida, to Arturo Merino Benítez International Airport in Santiago, Chile, with stopovers in Quito, Ecuador, and Lima, Peru. On October 2, 1996, the Boeing 757-23A aircraft flying the final leg of the flight crashed, killing all 70 people aboard.

<span class="mw-page-title-main">Avianca Flight 052</span> 1990 aviation accident in New York

Avianca Flight 052 was a regularly scheduled flight from Bogotá, Colombia, to New York City, United States, via Medellín, Colombia, that crashed on January 25, 1990, at 21:34 (UTC−05:00). The Boeing 707 flying this route ran out of fuel after a failed attempt to land at John F. Kennedy International Airport (JFK), causing the aircraft to crash onto a hillside in the small village of Cove Neck, New York, on the north shore of Long Island. Eight of the nine crew members and 65 of the 149 passengers on board were killed. The National Transportation Safety Board (NTSB) determined that the crash occurred due to the flight crew failing to properly declare a fuel emergency, failure to use an airline operational control dispatch system, inadequate traffic flow management by the Federal Aviation Administration (FAA), and the lack of standardized understandable terminology for pilots and controllers for minimum and emergency fuel states.

<span class="mw-page-title-main">American Airlines Flight 320</span> 1959 aviation accident

American Airlines Flight 320 was a scheduled flight between Chicago Midway Airport and New York City's LaGuardia Airport. On February 3, 1959, the Lockheed L-188 Electra performing the flight crashed into the East River during its descent and approach to LaGuardia Airport, killing 65 of the 73 people on board. Weather conditions in the area were poor, and the aircraft descended through dense clouds and fog. As it approached the runway, it flew lower than the intended path and it crashed into the icy river 4,900 feet (1,500 m) short of the runway. American Airlines had been flying the newly-developed Lockheed Electra in commercial service for only about two weeks before the accident, and the accident was the first involving the aircraft type.

<span class="mw-page-title-main">United Air Lines Flight 389</span> 1965 aviation accident

United Airlines Flight 389 was a scheduled flight from LaGuardia Airport, New York City, New York, to O'Hare International Airport, Chicago, Illinois. On August 16, 1965, at approximately 21:21 EST, the Boeing 727 crashed into Lake Michigan 20 miles east of Fort Sheridan, near Lake Forest, while descending from 35,000 feet (11,000 m) mean sea level (MSL). There was no indication of any unusual problem prior to impact. All 30 persons aboard, including six crew members and 24 passengers, were killed.

<span class="mw-page-title-main">American Airlines Flight 383 (1965)</span> 1965 aviation accident in the United States

American Airlines Flight 383 was a nonstop flight from New York City to Cincinnati on November 8, 1965. The aircraft was a Boeing 727, with 57 passengers, and 5 crew on board. The aircraft crashed on final approach to the Cincinnati/Northern Kentucky International Airport located in Hebron, Kentucky, United States. Only three passengers and one flight attendant survived the crash.

<span class="mw-page-title-main">Garuda Indonesia Flight 152</span> Aviation accident in Sibolangit, Indonesia, killing 234

Garuda Indonesia Flight 152 (GA152/GIA152) was a scheduled domestic flight operated by Garuda Indonesia from Soekarno-Hatta International Airport, Tangerang, to Polonia International Airport, Medan, in Indonesia. On 26 September 1997, the aircraft flying the route crashed into mountainous woodlands near the village of Buah Nabar, Sibolangit, killing all 222 passengers and 12 crew members on board. It is the deadliest aviation disaster in Indonesia's history.

<span class="mw-page-title-main">Alliance Air Flight 7412</span> 2000 aviation accident in Patna, Bihar, India

Alliance Air Flight 7412 was a scheduled Indian domestic passenger flight from Calcutta to Delhi, operated by Indian regional airliner Alliance Air. On 17 July 2000, while on approach to its first stopover in Patna, the Boeing 737-2A8 operating the route nose-dived and crashed into a residential area in Patna, killing 60 people including 5 on the ground.

<span class="mw-page-title-main">Inex-Adria Aviopromet Flight 1308</span> 1981 aviation accident

Inex-Adria Aviopromet Flight 1308 was a McDonnell Douglas MD-81 aircraft operating a Yugoslavian charter flight to the French island of Corsica. On 1 December 1981, the flight crashed on Corsica's Mont San-Pietro, killing all 180 people on board. The crash was the deadliest and first major aviation accident involving a McDonnell Douglas MD-80.

<span class="mw-page-title-main">Indian Airlines Flight 113</span> 1988 aviation accident

Indian Airlines Flight 113 was a flight operating from Mumbai to Ahmedabad that crashed on its final approach to Ahmedabad Airport on 19 October 1988, killing 133 of the 135 people on board.

<span class="mw-page-title-main">TAP Flight 425</span> 1977 aviation accident

TAP Flight 425 was a regular flight from Brussels, Belgium, to Santa Catarina Airport, Portugal, with an intermediate scheduled stop in Lisbon. On 19 November 1977, the Boeing 727 operating the service overran the airport's runway before crashing onto the nearby beach and exploding, killing 131 of the 164 people on board.

<span class="mw-page-title-main">Pan Am Flight 816</span> 1973 aviation accident

Pan Am Flight 816 was an international flight from Auckland, New Zealand, to San Francisco, California, via Tahiti, French Polynesia, and Los Angeles, California. It was operated by a Pan Am Boeing 707-321B bearing the registration N417PA and named Clipper Winged Racer. On July 22, 1973, at 10:06 P.M. local time, the Boeing 707 took off from Faa'a International Airport in Papeete. Thirty seconds after takeoff, the airliner, carrying 79 passengers and crew, crashed into the sea. All occupants except 1 passenger were killed.

<span class="mw-page-title-main">Independent Air</span> Former American airline

Independent Air was an airline based in the United States, that was founded in 1970. The airline ceased operations in 1990.

<span class="mw-page-title-main">Air France Flight 422</span> 1998 aviation accident

Air France Flight 422 was a scheduled flight on 20 April 1998 by Air France from Bogotá, Colombia, to Quito, Ecuador, covering the final leg of a flight from Paris to Quito. The Boeing 727 was destroyed, killing all 53 people on board, when it crashed into the Eastern Hills of Bogotá because of foggy weather and low visibility after taking off from Bogotá's El Dorado International Airport. The plane was owned by TAME, the Ecuadorian airline, but was being operated on a wet-lease basis to Air France as the final leg of its flight from Paris.

<span class="mw-page-title-main">Pan Am Flight 806</span> 1974 aviation accident

Pan Am Flight 806 was an international scheduled flight from Auckland, New Zealand, to Los Angeles, California, with intermediate stops at Pago Pago, American Samoa and Honolulu, Hawaii. On January 30, 1974, the Boeing 707 Clipper Radiant crashed on approach to Pago Pago International Airport, killing 87 passengers and ten crew members.

<span class="mw-page-title-main">1965 Carmel mid-air collision</span> US aviation incident

The 1965 Carmel mid-air collision occurred on December 4, 1965, when Eastern Air Lines Flight 853 (N6218C), a Lockheed Super Constellation en route from Boston Logan International Airport to Newark International Airport, collided in mid-air with Trans World Airlines Flight 42 (N748TW), a Boeing 707-131B en route from San Francisco International Airport to John F. Kennedy International Airport, over Carmel, New York, United States.

<span class="mw-page-title-main">Iberia Flight 610</span> Plane crash on 19 February 1985

Iberia Flight 610 was a scheduled domestic passenger flight from Madrid to Bilbao, Spain. On 19 February 1985, a Boeing 727-200 operating the flight crashed into a ravine after one of its wings sliced a television antenna on the summit of Mount Oiz in Biscay during an approach to Bilbao Airport. All 141 passengers and 7 crew on board died. The crash is the deadliest aviation disaster in both the Basque Country and Iberia history.

<span class="mw-page-title-main">Sterling Airways Flight 296</span> 1972 aviation accident in Dubai

On 14 March 1972, Sterling Airways Flight 296 crashed into a mountain ridge on approach to Dubai in Al Hail, Fujairah, United Arab Emirates. Flight 296 was a charter flight from Colombo to Copenhagen with stops in Bombay, Dubai, and Ankara. All 112 passengers and crew on board died in the crash which was attributed to pilot error. The flight was operated by a Sud Aviation Caravelle, registration OY-STL. To date, it is the deadliest air disaster to involve a Caravelle and the deadliest air disaster in the history of the United Arab Emirates along with Gulf Air Flight 771 which also killed 112.

<span class="mw-page-title-main">Air France Flight 212 (1968)</span> Fatal aviation accident in Guadeloupe

Air France Flight 212 was a Boeing 707-328C, registration F-BLCJ, that crashed into the northwestern slope of La Soufrière Mountain, in Guadeloupe on 6 March 1968, with the loss of all 63 lives on board. The aircraft, named "Chateau de Lavoute Polignac", was operating the Caracas–Pointe-à-Pitre sector of Air France's South America route.

<span class="mw-page-title-main">Lufthansa Cargo Flight 527</span> 1979 aviation accident

Lufthansa Cargo Flight 527 was a Lufthansa Cargo flight scheduled to fly from Rio de Janeiro in Brazil to Dakar, the capital of Senegal. On 26 July 1979, shortly after take-off in Rio, the Boeing 707 flew into a slope and crashed. All 3 crew members, consisting of the captain, the first officer and a flight engineer died; there were no survivors. The principal cause of the crash was the failure of air traffic controllers to pay the necessary attention to each aircraft and ensure the necessary attention to rising terrain.

References

  1. "FAA Registry (N7231T)". Federal Aviation Administration.
  2. 1 2 Ranter, Harro. "Aircraft accident Boeing 707-331B N7231T Pico Alto". aviation-safety.net. Aviation Safety Network . Retrieved 30 November 2013.
  3. Wise, Peter (9 February 1989). "144 ARE FEARED DEAD IN AZORES PLANE CRASH". The Washington Post. ISSN   0190-8286 . Retrieved 21 August 2020.
  4. "The jet that crashed in the Azores Wednesday, killing..." UPI. 9 February 1989. Retrieved 21 August 2020.
  5. "Tragedia delle Azzorre, 20 morti Dopo 25 anni il ricordo è indelebile" [Tragedy in the Azores, 20 dead After 25 years, the memory is indelible]. L'Eco di Bergamo (in Italian). 14 February 2008. Retrieved 21 August 2020.
  6. "JetPhotos.Net » Aircraft Census Database » CN 19572 Boeing 707-331B N7231T". Archived from the original on 3 December 2013. Retrieved 20 November 2018.
  7. Whittle, Dan (9 February 1989). "MTSU graduate dies: In Independent charter air crash". The Daily News-Journal. p. 1, 2 . Retrieved 3 July 2023 via Newspapers.com.
  8. "Charter Jet Crash in Azores Kills 144". The New York Times. Associated Press. 9 February 1989. ISSN   0362-4331.
  9. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Duke, Thomas A. (February 1995). "Aircraft Descended Below Minimum Sector Altitude and Crew Failed to Respond to GPWS as Chartered Boeing 707 Flew into Mountain in the Azores" (PDF). Accident Prevention. Vol. 52, no. 2. Flight Safety Foundation. Archived from the original (PDF) on 26 December 2010. Retrieved 6 November 2012.
  10. "Pilot, Flight Attendant Killed In Crash Were To Be Married With PM-Azores Crash Bjt". AP NEWS. Associated Press. 9 February 1989. Retrieved 21 August 2020.
  11. "Pilot, flight attendant on doomed jet were engaged". United Press International. 9 February 1989. Retrieved 21 August 2020.
  12. Ranter, Harro. "Boeing 707". aviation-safety.net. Aviation Safety Network. Retrieved 8 April 2019.
  13. "Independent Air vs Tosini". leagle.com. Leagle.
  14. "Our Work and Past cases". speiserkrause.com. Spenser & Krause.
  15. "Air Crash Investigation" Independent Air Flight 1851 (TV Episode) - IMDb , retrieved 7 June 2022

Further reading