Accident
Last updated: 23 November 2014
Statuts:
Date:mardi 10 avril 1973
Heure:10:13
Type/Sous-type:Vickers 952 Vanguard
Compagnie:Invicta International Airways
Immatriculation: G-AXOP
Numéro de série: 745
Année de Fabrication: 1962-05-01 (10 years 12 months)
Heures de vol:16367
Moteurs: 4 Rolls-Royce Tyne 512
Equipage:victimes: 4 / à bord: 6
Passagers:victimes: 104 / à bord: 139
Total:victimes: 108 / à bord: 145
Dégats de l'appareil: Détruit
Conséquences: Written off (damaged beyond repair)
Lieu de l'accident:15 km (9.4 milles) S of Basel/Mulhouse Airport (BSL) (   Suisse) show on map
Phase de vol: En approche (APR)
Nature:Charter International
Aéroport de départ:Bristol Airport (BRS/EGGD), Royaume Uni
Aéroport de destination:Basel/Mulhouse Airport (BSL/LFSB), France
Numéro de vol: 435
Détails:
The Invicta International Airlines Vickers Vanguard was operating on a charter flight from Bristol (BRS) to Basle Mulhouse (BSL). After entering the Basle Mulhouse terminal area, the flight was cleared to continue to the BN NDB. Weather was poor at that time: cloud base at 120 m (390 feet) and a reported runway visual range of 700 (2300 feet) and 1300 m (4250 feet). On arrival at the BN beacon the crew were cleared to descend to 2500 feet and were asked to report over the MN beacon before making a 90 degree left hand turn to finals for runway 16. At 09:56 the crew reported at 2500 feet, followed by a position report of the MN beacon at 09:57:40. When on finals over the BN beacon, the crew reported turning outbound and said they would report at the MN beacon again for another approach. When the crew reported overhead the BN beacon again, the plane was in fact overhead the airfield, flying parallel to the ILS localizer beam. After 1,5 minute the aircraft began to overshoot, correctly making an initial turn to the west. The crew, now flying well south of the field, were instructed to report back over the MN beacon. When reporting over the MN beacon again, before it would have to turn left for finals, the plane was in fact overhead the BS beacon, a beacon located to the south of runway 16. At 10:11:25 the crew reported over the BN beacon on finals and was cleared to land. In fact the plane was now flying 3 miles South of the field and 1 mile west of the extended centerline. Two miles further on Basle ATC asked the crew "Are you sure you are over the BN?". The captain replied "I think I've got a spurious indication. We are on the LO... on the ILS now, sir". Half a minute later the captain radioed "BN is established on localizer and glide path; the ADF's all over the place in this weather." Last radio contact was when the captain reported at 1400 feet, to which ATC replied that the flight was probably to the south of the airport. At 10:13 the plane brushed against a wooded range of hills and crashed 15 km from the airport. The aircraft disintegrated, except for the tail section, were most of the survivors were found.

PROBABLE CAUSE: "A loss of orientation during two ILS approaches carried out under instrument flight conditions. The following factors contributed to the occurrence of the accident:
1) inadequate navigation, above all imprecise initiation of final approach as regards height and approach center-line.; 2) confusion of aids; and 3) insufficient checking and comparison of navigational aids and instrument readings (cross and double checks).
The poor reception of ht medium wave beacons and technical defects in LOC receiver No.1 and glide slope receiver no.2 made the crew’s navigational work more difficult."

Sources:
» The Basle Vanguard accident, Flight International 18 Sep. 1975 (p. 404-405)
» Vanguard hearing: crew records and equipment faults cited, Flight International 14 Nov. 1974 (p. 666)

Official accident investigation report
investigating agency: Air Accidents Investigation Branch (AAIB) - United Kingdom
report status: Final
report number: AAIB AAR 11/1975
download report: Vickers Vanguard 952, G-AXOP. Report on the accident at Hochwald/Solothurn, Switzerland, on 10 April 1973 (AAIB AAR 11/1975)
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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 Bristol Airport et Basel/Mulhouse Airport est de 845 km (528 miles).

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