Accident
Last updated: 27 November 2014
Statuts:Enquête Officielle
Date:lundi 17 octobre 1988
Heure:00:30
Type/Sous-type:Silhouette image of generic B703 model; specific model in this crash may look slightly different
Boeing 707-338C
Compagnie:Uganda Airlines
Immatriculation: 5X-UBC
Numéro de série: 19630/746
Année de Fabrication: 1968
Heures de vol:57776
Moteurs: 4 Pratt & Whitney JT3D-3B
Equipage:victimes: 7 / à bord: 7
Passagers:victimes: 26 / à bord: 45
Total:victimes: 33 / à bord: 52
Dégats de l'appareil: Détruit
Conséquences: Written off (damaged beyond repair)
Lieu de l'accident:1 km (0.6 milles) SE of Roma-Fiumicino Airport (FCO) (   Italie) show on map
Phase de vol: En approche (APR)
Nature:Transport de Passagers Intern.
Aéroport de départ:London-Gatwick Airport (LGW/EGKK), Royaume Uni
Aéroport de destination:Roma-Fiumicino Airport (FCO/LIRF), Italie
Numéro de vol: 775
Détails:
The aircraft took off from London-Gatwick (LGW) at 21:10 UTC on a flight to Rome (FCO) and Entebbe (EBB) . During descent to Rome, clearance was received for a descent to 4000 feet in preparation for an ILS approach to runway 16L. Visibility was deteriorating with RVR values of 400m (point Alfa), 1000m (point Bravo) and 350m (point Charlie). A missed approach procedure was carried out at 00:05. A second approach was attempted, this time to runway 25. This was also abandoned due to poor visibility. RVR values for runway 34L (1600m, 2000m and 150m resp. at Alfa, Bravo and Charlie) made the crew request radar vectoring to runway 34L. The aircraft was established on the localizer at 00:28. The aircraft continued to descend below the 420 feet MDA, although the runway visual markings hadn't been located. Because the flight crew failed to use the indispensable altitude callouts, the GPWS sounded unexpectedly.
The aircraft impacted the roof of a house 1300m short of the runway, 100m right of the extended centreline. It continued and impacted another building 85m further on. The Boeing then broke up and burst into flames.


PROBABLE CAUSE: "The crew's lack of adequate preparation in the procedure for a Non Precision Approach on runway 34L at Fiumicino Airport, especially in the matter of crew coordination and altitude callouts and their continued descent beyond MDA without having located the runway visual markings.
Besides, the following factors may have contributed to the cause of the accident:
1) Presumed mental and physical fatigue, accumulated by the crew during the two previous landing approaches, which were also carried out in an environmental situation that was extremely unfavourable and operationally demanding.;
2) A configuration of the Altitude Instruments, which although sufficient for the approaches that were carried out, consisted of a single radio altimeter with the acoustic warning of the MDA crossing inoperative;
3) The attention of the crew was excessively concentrated on the luminous sources along runway 34L, instead of on the instrument readings.
Furthermore (...) part of the Board of Inquiry as well as the representative of the Ugandan CA, disassociated themselves from the majority, during the phase of identifying the factors that may have contributed to causing the accident."

Sources:
» ICAO Adrep Summary 2/89 (#10)
» ICAO Circular 260-AN/154


Photos

photo of Boeing 707-338C 5X-UBC
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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 London-Gatwick Airport et Roma-Fiumicino Airport est de 1396 km (872 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.
languages: English Français Nederlands Deutsch Espanol

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