Accident
Last updated: 21 October 2014
Statuts:Enquête Officielle
Date:lundi 21 décembre 1992
Heure:07:33 UTC
Type/Sous-type:McDonnell Douglas DC-10-30CF
Compagnie:Martinair Holland
Immatriculation: PH-MBN
Numéro de série: 46924/218
Année de Fabrication: 1975
Heures de vol:61543
Cycles:14615
Moteurs: 3 General Electric CF6-50C
Equipage:victimes: 2 / à bord: 13
Passagers:victimes: 54 / à bord: 327
Total:victimes: 56 / à bord: 340
Dégats de l'appareil: Perte Totale
Conséquences: Written off (damaged beyond repair)
Lieu de l'accident:Faro Airport (FAO) (   Portugal) show on map
Phase de vol: A l'atterrissage (LDG)
Nature:Charter International
Aéroport de départ:Amsterdam-Schiphol International Airport (AMS/EHAM), Pays-Bas
Aéroport de destination:Faro Airport (FAO/LPFR), Portugal
Numéro de vol: 495
Détails:
At 05:52 LT Flight 495 took off from Amsterdam for a flight to Faro. The flight had been delayed for 40 minutes due to no. 2 engine reverser problems. After a flight of 2 and 17 minutes a the flight was cleared to descend to FL70. Shortly afterwards Faro Approach Control provided the crew with the following weather: wind 15deg./18kts; 2500m visibility; thunderstorms with 3/8 clouds at 500 feet, 7/8 clouds at 2300 feet and 1/8 cumulonimbus at 2500 feet, temp. 16deg. C.
Clearance to descend to 1220m was given at 08:20, followed by a clearance to 915m and 650m 4, resp. 6 minutes later. At 08:29 the crew were informed that the runway was flooded. At an altitude of 303m and 140 knots speed the approach became unstable and at 177m the first officer switched the autopilot from CMD (command mode) to CWS (control-wheel steering). One minute later it was switched from CWS to manual and the airspeed began falling below approach reference speed. About 3-4 seconds short of touchdown elevator was pulled to pitch up and engine power was increased. When the no. 3 and 5 spoilers extended, the aircraft had a 25deg. bank, left wing up. The right main gear contacted the runway with a 900 feet/min descent rate at 126 knots, +8.79deg. pitch up, +5.62deg roll and 1,9533G. The right wing separated while the aircraft slid down the runway. The aircraft came to rest 1100m from the runway 11 threshold and 100m to the right of the centreline and caught fire.


PROBABLE CAUSES: "The high rate of descent in the final phase of the approach and the landing made on the right landing gear, which exceeded the structural limitations of the aircraft.; The crosswind, which exceeded the aircrafts limits and which occurred in the final phase of the approach and during landing. The combination of both factors determined stresses which exceeded the structural limitations of the aircraft.
Contributing factors were: The instability of the approach; the premature power reduction, and the sustaining of this condition, probably due to crew action; the incorrect wind information delivered by Approach Control; the absence of an approach light system; the incorrect evaluation by the crew of the runway conditions; CWS mode being switched off at approx. 80ft RA, causing the aircraft to be in manual control in a critical phase of the landing; the delayed action of the crew in increasing power; the degradation of the lift coefficient due to heavy showers." (DGAC Portugal)

The Netherlands Aviation Safety Board commented that the probable cause should read: "a sudden and unexpected wind variation in direction and speed (windshear) in the final stage of the approach. Subsequently a high rate of descent and an extreme lateral displacement developed, causing a hard landing on the right-hand main gear, which in combination with a considerable crab angle exceeded the aircraft structural limitations.
Contributing factors: From the forecast and the prevailing weather the crew of MP495 did not expect the existence of windshear phenomena.; The premature large power reduction and sustained flight idle thrust, most probable due to crew action.; CWS mode being disengaged at approx. 80ft RA, causing the aircraft to be in manual control at a critical stage in the landing phase."

Sources:
» Flight Crew of DC-10 Encounters Microburst During Unstabilized Approach, Ending in Runway Accident (Flight Safety Foundation - Accident Prevention August 1996)
» Air Safety Week 4.1.1993 (p. 1, 2)

Official accident investigation report
investigating agency: Gabinete de Prevenção e Investigação de Acidentes (GPIA) - Portugal
report status: Final
report number: 22/ACCID/GPI/92
download report: McDonnel Douglas Corporation DC-10-30F Martinair Holland N.V. relatório final do acidente ocorrido no aeroporto de Faro – Portugal em 21 de Dezembro de 1992 (GPIA 22/ACCID/GPI/92)
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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 Amsterdam-Schiphol International Airport et Faro Airport est de 1955 km (1222 miles).

languages: English Français Nederlands Deutsch Espanol

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