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Last updated: 21 October 2017
Statuts:Enquête Officielle
Date:lundi 26 octobre 2015
Type/Sous-type:Silhouette image of generic B734 model; specific model in this crash may look slightly different
Boeing 737-4L7
Operated by:Comair
On behalf of:British Airways
Immatriculation: ZS-OAA
Numéro de série: 26960/2483
Année de Fabrication: 1993-05-23 (22 years 5 months)
Heures de vol:57543
Moteurs: 2 CFMI CFM56-3C1
Equipage:victimes: 0 / à bord: 6
Passagers:victimes: 0 / à bord: 94
Total:victimes: 0 / à bord: 100
Dégats de l'appareil: Substantiels
Conséquences: Written off (damaged beyond repair)
Lieu de l'accident:Johannesburg-O.R. Tambo International Airport (JNB) (   Afrique du Sud)
Phase de vol: A l'atterrissage (LDG)
Nature:Transport de Passagers Nat.
Aéroport de départ:Port Elizabeth Airport (PLZ/FAPE), Afrique du Sud
Aéroport de destination:Johannesburg-O.R. Tambo International Airport (JNB/FAOR), Afrique du Sud
Numéro de vol:BA6234
A Boeing 737-400, operated by Comair on behalf of British Airways, sustained severe damage in a landing accident at Johannesburg-OR Tambo Airport, South Africa. There were 94 passengers and six crew members on board.
The aircraft, flight number BA6234, departed Port Elizabeth Airport at 08:20 UTC on an instrument flight plan rule for Johannesburg.
The first officer was the flying pilot for this leg. During approach to Johannesburg the aircraft was cleared for landing on runway 03R. The approach was flown with a tailwind (340° at 10 knots).
After crossing the runway threshold, the first officer began flaring the aircraft at 65 feet instead of 20 feet as recommended by Boeing. This contributed to a low sink rate (1.8 feet/second). The aircraft touched down at an excessive ground speed of 167 knots. The flight crew felt the aircraft vibrating, during which they applied brakes and deployed the reverse thrust.
The left main gear collapsed approximately 5 seconds after touchdown, causing the aircraft to roll slightly low to the left.
It later came to full stop around 35 seconds later, slightly left of the runway centreline, resting on its right main landing gear and the number one engine, with the nose landing gear in the air.
The aircraft sustained substantial damage as the number one engine scraped along the runway surface when the landing gear detached from the fuselage. The occupants were allowed to disembark from the aircraft via the left aft door due to the attitude in which the aircraft came to rest.
It was determined that the early flare and low sink rate on touchdown caused a condition in which excessive vibrations build up on the left landing gear and resulted in the upper torsion link failure.
The thermal relief valve of the shimmy damper contained oil which could have impaired its effectiveness
Significant wear was found on the upper torsion link bushes, which could have contributed with the un-dampened vibration build up during operation.

Probable Cause:

Probable Cause:
Unstable approach whereby the aircraft was flared too high with high forward speed resulting with a low sink rate in which during touch down the left landing gear experienced excessive vibration and failed due to shimmy events.

Accident investigation:
Investigating agency: CAA SouthAfrica
Status: Investigation completed
Duration: 1 year and 5 months
Accident number: CA18/2/3/9494
Download report: Final report

METAR Weather report:
09:00 UTC / 10:00 local time:
FAOR 260900Z VRB07KT CAVOK 26/05 Q1029 NOSIG

10:00 UTC / 12:00 local time:
FAOR 261000Z VRB05KT 9999 FEW045 26/04 Q1029 NOSIG

11:00 UTC / 13:00 local time:
FAOR 261100Z 12006KT 060V170 CAVOK 27/04 Q1028 NOSIG

Opérations de secours

SACAA issued 1 Safety Recommendation

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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 Port Elizabeth Airport et Johannesburg-O.R. Tambo International Airport est de 906 km (566 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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