TAP Flight 425

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Transportes Aéreos Portugueses Flight 425
TAP Portugal Boeing 727-282Adv CS-TBR.jpg
CS-TBR, the aircraft involved, seen at Düsseldorf Airport, three months prior to the accident
Accident
Date19 November 1977 (1977-11-19)
Summary Runway overrun
Site Madeira International Airport, Funchal, Portugal
32°41′17″N16°47′8″W / 32.68806°N 16.78556°W / 32.68806; -16.78556
Aircraft
Aircraft type Boeing 727-282 Advanced
Aircraft name Sacadura Cabral
Operator Transportes Aéreos Portugueses
IATA flight No.TP425
ICAO flight No.TAP425
Call signTAP 425
Registration CS-TBR
Flight origin Brussels Airport, Brussels, Belgium
Stopover Lisbon Portela Airport, Portugal
Destination Madeira International Airport, Funchal, Portugal
Occupants164
Passengers156
Crew8
Fatalities131
Injuries33
Survivors33

TAP Flight 425 was a regular flight from Brussels, Belgium, to Santa Catarina Airport (informally known as Funchal Airport or Madeira Airport; now the Cristiano Ronaldo International 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. [1] [2]

Contents

Background

Aircraft

The aircraft involved was a Boeing 727-282 Advanced registered as CS-TBR named after the Portuguese aviation pioneer Sacadura Cabral. Its manufacturer serial number was 20972 and line number 1096. It was delivered to TAP on 21 January 1975. It was powered by three Pratt & Whitney JT8D-17 turbofan engines which had a maximum thrust of 16,000 pounds-force (71 kN) each. The aircraft had completed a B check on 21 September 1977, and at the time of the accident had accumulated 6,154 flying hours in 5,204 cycles. [3] : 37–38 

Crew

The crew consisted of Captain João Lontrão, First Officer Miguel Guimarães Leal, and Flight Engineer Gualdino Pinto, as well as five flight attendants. There were 156 passengers on board. [3] : 8, 34 

Accident

On 19 November 1977, the aircraft operated Flight TP420 from Lisbon to Brussels, Belgium, and then Flight TP425 from Brussels to Funchal with a stopover in Lisbon. Flight 420 and the first leg of Flight 425 were completed without any issues reported. In Lisbon, the crew received the Funchal weather report. According to the forecast, severe weather was expected enroute with a chance of thunderstorm cumulus and torrential rain, but was unlikely to affect the flight. [3] : 3 

At 7:50 pm Flight TP425 left the gate, and took off from runway 03 at Lisbon Airport at 7:55pm. [3] : 4 

At the time of the accident, the then-Santa Catarina International Airport's runway was 1,600 m (5,250 ft) long, which made landing extremely difficult.

At 9:05 pm, on the approach to Madeira, the crew of Flight TP425 requested permission to descend. The controller gave permission to descend to flight level 50 (5,000 feet or 1,524 metres) at a pressure of 1013.2 mbar. At 9:05:50, the crew reported on the beginning of the descent to FL50 towards Porto Santo, and received instructions to switch to 118.1 MHz to communicate with Funchal control. At 9:17pm the crew contacted air traffic control in Funchal and reported reaching flight level 50 and the ETA at the MAD radio beacon in 5 minutes. In response, the controller gave permission to descend to a height of 3,500 feet (1,100 m) on QNH 1013 and reported that the landing would be on runway 06. The controller then transmitted the weather report: calm wind on runway 06, wind 14 knots (7 m/s; 26 km/h; 16 mph) direction 220 at nearby Rosário, temperature 19 °C (66 °F), visibility 4–5 kilometres (2.5–3.1 mi; 2.2–2.7 nmi). The crew acknowledged the transmission. According to the actual weather forecast at Funchal airport at 8:50pm, the wind speed was 6 knots (3.1 m/s; 11.1 km/h; 6.9 mph) - a heading of 200, visibility 5 kilometres (3.1 mi; 2.7 nmi), cloud 7/8, rain showers, airfield pressure at runway 24: 1006 mbar, at runway 06: 1008 mbar, temperature 18–19 °C (64–66 °F). [3] : 4 

At 9:23:13 the crew reported passing the MAD beacon at a height of 1,700 feet (518 m) and a heading of 215°, while not having visual contact with the ground. Following the course of 200° and descending through 980 feet, at 9:26:33 flight TP425 reported that there was no visual observation of the runway and executed a missed approach. [3] : 5 

After two unsuccessful attempts to land the aircraft, the crew decided to make one last try to land before they would make the decision to divert to Gran Canaria Airport in the Canary Islands. [3] [ additional citation(s) needed ]

On the third landing attempt, Captain Lontrão chose runway 24. At 9:43:52, at an altitude of 1,800 feet (550 m) the aircraft was reported to be flying at a rate of 205 knots (380 km/h; 236 mph), and at 9:44:57 the controller asked the crew to see if they had the aircraft's landing lights on. The crew confirmed that they were. At 9:45:02 the crew reported passing the airport's beacon and reported the runway in sight. At 9:46:48, when turning right onto a heading of 250° Captain Lontrão called for the landing checklist. [3] : 5 

At 9:47:21 the tower reported the wind on runway 24 and asked if the crew would proceed with the landing. The crew said that they would continue. The controller subsequently cleared flight 425 to land. From a height of 400 feet (120 m) at a speed of 150 knots (280 km/h; 170 mph), the plane began to descend. While on final approach to runway 24 in heavy rain, strong winds and poor visibility, the aircraft touched down 2,000 feet (610 m) past the threshold, and started hydroplaning. With just 3,000 feet (910 m) of runway left, the crew tried desperately to stop, applying maximum reverse thrust and brakes, but the aircraft slid off the runway at a ground speed of approximately 43 knots (80 km/h; 49 mph) and plunged over a 200-foot (61 m) steep bank, hitting a nearby bridge and crashing on the beach, splitting in two and bursting into flames. [3] : 6–7 

Of the 164 people aboard (156 passengers and 8 crew), 131 were killed (125 passengers and 6 crew), [4] making it the deadliest airplane accident in Portugal to that point. [5] As of 2023, it is the second deadliest airplane accident in Portugal, after Independent Air Flight 1851. [6] [7] It remains TAP Portugal's only fatal accident since the beginning of its flight operations in 1946. [8]

Investigation

According to the findings of the investigation, the crew was qualified for the flight. The report stated that the aircraft was in good condition after leaving the runway up until it made impact with the bridge. The report concluded that the flight crew violated the approach procedure, with the aircraft touching down 2,060 feet (630 m) from the beginning of the runway, which is 1,060 feet (320 m) farther than normal, and the speed was 148.2 knots (274.5 km/h; 170.5 mph) which is, 19.2 knots (35.6 km/h; 22.1 mph) higher than recommended. It was also noted that the 1000 ft indication lights were turned off because the VASI system was activated. Due to limitations in the Airport's electrical installation at the time, either the VASI system or the aiming point indicator could be turned on, but not both simultaneously. [3] : 29  Difficult weather conditions were mentioned as the immediate causes of the accident, due to aquaplaning on the runway, as well as an overshoot landing speed of 19 knots. [3] : 30  The investigation recommended Funchal Airport to increase the level of meteorological observations. [3] : 31  [9]

Aftermath

After the accident occurred, TAP stopped flying the Boeing 727-200 to Madeira, and started flying only the 727-100, which was 20 feet (6.1 m) shorter and took 60 fewer passengers. [10]

The crash prompted officials to explore ways of extending the short runway. Because of the height of the runway relative to the beach below, an extension was very difficult and very expensive to perform. [10] Between 1983 and 1986, [11] a 200-metre (660 ft) extension was built; 14 years later, [12] the runway was again extended. Following the 2000 extension, the runway of what is now the Cristiano Ronaldo International Airport measures 2,781 metres (9,124 ft) long and is capable of handling wide-body commercial jets like the Boeing 747 or the Airbus A340. [13] [14]

See also

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References

  1. ↑ "B3A Aircraft Accidents Archives". Archived from the original on 2015-12-10. Retrieved 2014-06-21.
  2. ↑ "Desastre aéreo na Madeira: 123 mortos" [Air disaster in Madeira: 123 dead]. Acervo Digital - Folha de S.Paulo (in Brazilian Portuguese). Retrieved 2019-10-17.
  3. 1 2 3 4 5 6 7 8 9 10 11 12 "Final accident report" (in Portuguese). DGAC. Retrieved 2019-06-25.
  4. ↑ "Accident Database: Accident Synopsis 11191977®=CS-TBR". Airdisaster.com. 2011-06-07. Archived from the original on 2011-06-07. Retrieved 2008-05-07.{{cite web}}: CS1 maint: unfit URL (link)
  5. ↑ Ranter, Harro. "ASN Aircraft accident Boeing 727-282 CS-TBR Funchal Airport (FNC)". aviation-safety.net. Aviation Safety Network . Retrieved 2019-10-17.
  6. ↑ Ranter, Harro. "ASN Aircraft accident Boeing 707-331B N7231T Santa Maria-Vila do Porto Airport, Azores (SMA)". aviation-safety.net. Aviation Safety Network. Retrieved 2019-10-17.
  7. ↑ Ranter, Harro. "Portugal air safety profile". aviation-safety.net. Aviation Safety Network. Retrieved 2021-01-03.
  8. ↑ "TAP Air Portugal plane crashes". www.airsafe.com. Retrieved 2019-04-08.
  9. ↑ Airplane Flying Handbook - Approaches and Landings (PDF). Federal Aviation Administration. pp. 6–7.
  10. 1 2 Rádio e Televisão de Portugal Documentary TP425 - O voo interminável [TP425 - The Endless Flight] on YouTube (aired November 14th 2007, in Portuguese)]
  11. ↑ "Aeroporto da Madeira (Funchal) - 1983 a 1986" [Madeira Airport (Funchal) - 1983 to 1986]. aeroportosdamadeira.pt (in Portuguese). Archived from the original on September 3, 2011. Retrieved 2010-02-20.
  12. ↑ "Aeroporto da Madeira (Funchal) - 2000" [Madeira Airport (Funchal) - 2000]. aeroportosdamadeira.pt (in Portuguese). Archived from the original on September 3, 2011. Retrieved 2008-05-07.
  13. ↑ "História" [History] (in Portuguese). Aeroporto da Madeira. 2012. Archived from the original on 2014-05-07. Retrieved 2013-11-25.
  14. ↑ "Madeira Airport amongst world's 'Top-10 most stunning aerial approaches'". www.theportugalnews.com. Archived from the original on 2019-10-17. Retrieved 2019-10-17.
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