Crash-aerien 25 JAN 1961 d'un de Havilland DH-106 Comet 4 G-APDM - Roma-Fiumicino Airport (FCO)
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Statuts:Accident investigation report completed and information captured
Date:mercredi 25 janvier 1961
Type/Sous-type:Silhouette image of generic COMT model; specific model in this crash may look slightly different
de Havilland DH-106 Comet 4
Compagnie:British Overseas Airways Corporation - BOAC
Immatriculation: G-APDM
Numéro de série: 6414
Année de Fabrication: 1959
Heures de vol:5633
Moteurs: 4 Rolls-Royce Avon 524
Equipage:victimes: 0 / à bord: 8
Passagers:victimes: 0 / à bord: 44
Total:victimes: 0 / à bord: 52
Dégats de l'appareil: Substantiels
Conséquences: Repaired
Lieu de l'accident:67 km (41.9 milles) N of Roma-Fiumicino Airport (FCO) (   Italie)
Phase de vol: A l'atterrissage (LDG)
Nature:Transport de Passagers Intern.
Aéroport de départ:London-Heathrow Airport (LHR/EGLL), Royaume Uni
Aéroport de destination:Roma-Fiumicino Airport (FCO/LIRF), Italie
Numéro de vol:BA115
Détails:
The Comet 4 operated on BOAC flight 115 from London to Rome, Khartoum, Nairobi, Salisbury and Johannesburg.
During the descent towards Rome, the aircraft prematurely descended and performed the approach procedure. After lowering the gear and beginning his approach, the aircraft hit pine trees on Monte Cimino, 40 miles North of Rome.
Damage was caused to nosewheel, main undercarriage and flaps, but aircraft managed to make a successful landing at Fiumicino afterwards.

Probable Cause:

The accident was attributed to the following causes:
1. Exercises for familiarization, as recommended by ICAO, with the approach procedure for Fiumicino were not carried out. These exercises were all the more necessary as it was the first time that this crew had flown to the airport.
2. The aircraft did not fly over NR and did not follow a QDR (magnetic heading) between 115° and 122° from NR.
3. The two radio compasses were tuned to the same frequency. As a result, only one "double" erroneous indication was available, whereas it would have been possible to have had useful indications from different sources for a "fix", by using the bearings of pairs of radio beacons.
4. After both radio compasses had been tuned to the NF frequency, and their indications agreed with one another, they were accepted as reliable.
5. For the final navigation phase only the radio compasses were used. More importance shouId have been attached to the contemporaneous indications of the compass and clock after appreciable differences had been noted between information shown in the flight log and data which could have been obtained subsequently by observation and measurement.
6. Inaccuracy in radio communications on the part of the second pilot, (as shown in communication at 2029:30 hours).
7. The Prague transmitter interfered with radio beacon NF.

Sources:
» ICAO Circular 69


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Plan
Ce plan montre l'aéroport de départ ainsi que la supposée destination du vol. La ligne fixe reliant les deux aéroports n'est pas le plan de vol exact.
La distance entre London-Heathrow Airport et Roma-Fiumicino Airport est de 1434 km (896 miles).
Accident location: Approximate; accuracy within a few kilometers.

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 tel qu'ils sont connus à ce jour.
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