Accident
Last updated: 19 June 2013
| Statuts: | Enquête Officielle |
| Date: | 06 FEV 1996 |
| Heure: | 23:47 |
| Type/Sous-type: |  Boeing 757-225 |
| Opérant pour: | Alas Nacionales |
| Loué à : | Birgenair |
| Immatriculation: | TC-GEN |
| Numéro de série: | 22206/31 |
| Année de Fabrication: | 1985 |
| Heures de vol: | 29269 |
| Cycles: | 13499 |
| Moteurs: | 2 Rolls Royce RB211-535E4 |
| Equipage: | victimes: 13 / à bord: 13 |
| Passagers: | victimes: 176 / à bord: 176 |
| Total: | victimes: 189 / à bord: 189 |
| Dégats de l'appareil: | Détruit |
| Conséquences: | Written off (damaged beyond repair) |
| Lieu de l'accident: | 26 km (16.3 milles) NE de Puerto Plata, Dominican Republic (Océan Atlantique)
 |
| Phase de vol: | En vol (ENR) |
| Nature: | Charter International |
| Aéroport de départ: | Puerto Plata-La Union International Airport (POP/MDPP), République Dominicaine |
| Gander Airport, NF (YQX/CYQX), Canada | |
| Numéro de vol: | 301 |
Flight ALW 301 departed Puerto Plata for a charter flight to Frankfurt via Gander and Berlin at 23:42 LT. At 80 knots on take-off the captain found out that his air speed indicator (ASI) wasn't working properly. The co-pilot's indicator seemed to work fine. While climbing through 4700 feet the captain's ASI read 350 knots (real speed was about 220kts); this resulted in an autopilot/autothrottle reaction to increase the pitch-up attitude and a power reduction in order to lower the airspeed. At that time the crew got 'Rudder ratio' and 'Mach airspeed' advisory warnings. Both pilots got confused when the co-pilot stated that his ASI read 200 knots decreasing while getting an excessive speed-warning, followed by a stick shaker warning. This led the pilots to believe that both ASIs were unreliable.
Finally realizing that they were losing speed and altitude they disconnected the autopilot (which, fed by the captain's faulty ASI, had reduced the speed close to the stall speed) and applied full thrust. At 23:47:17 an aural GPWS warning sounded. Eight seconds later the aircraft struck the ocean.
The incorrect ASI readings were possibly caused by an obstructed pitot tube, which had left uncovered for 3-4 days prior to this flight.
PROBABLE CAUSE: "The crew's failure to recognize the activation of the stick shaker as a warning of imminent entrance to the stall, and the failure of the crew to execute the procedures for recovery from the onset of loss of control." Sources:
» Air Safety Week 12.02.1996 (p. 1)
» Aviation Week & Space Technology 12.02.96(33,34)
» Flight International 14-21.02.96(4)
» NTSB Safety Recommendations A-96-15 through -20
» Erroneous Airspeed Indications Cited in Boeing 757 Control Loss (Flight Safety Foundation - Accident Prevention October 1999)
Sample newspaper article from Newspaperarchive.com
Opérations de secours
NTSB issued 6 Safety Recommendations
Show all AD's and Safety Recommendations
Show all AD's and Safety Recommendations
Photos
Plan
Ce plan montre l'aéroport de départ ainsi que la supposé destination du vol. La ligne fixe reliant les deux aéroports n'est pas le plan de vol exact.
La distance entre Puerto Plata-La Union International Airport et Gander Airport, NF est de 3524 km (2203 miles).
La distance entre Puerto Plata-La Union International Airport et Gander Airport, NF est de 3524 km (2203 miles).
Les informations ci-dessus ne représentent pas l'opinion de la 'Flight Safety Foundation' ou de 'Aviation Safety Network' sur les causes de l'accident. Ces informations prélimimaires sont basées sur les faits tels qui sont connus à ce jour.
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Océan Atlantique
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