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Last updated: 11 May 2021
Statuts:Enquête Officielle
Date:mardi 30 juillet 2019
Heure:14:30
Type/Sous-type:Silhouette image of generic RJ85 model; specific model in this crash may look slightly different
Avro RJ85
Compagnie:Cobham Aviation Services
Immatriculation: VH-NJW
Numéro de série: E2329
Année de Fabrication: 1998-06-13 (21 years 2 months)
Moteurs: 4 Lycoming LF507-1F
Equipage:victimes: 0 / à bord: 4
Passagers:victimes: 0 / à bord: 62
Total:victimes: 0 / à bord: 66
Dégats de l'appareil: Substantiels
Lieu de l'accident:Perth Airport, WA (PER) (   Australie)
Phase de vol: Tracté (PBT)
Nature:Charter National
Aéroport de départ:Perth Airport, WA (PER/YPPH), Australie
Aéroport de destination:Granny Smith Airport, WA (YGRS), Australie
Détails:
The RJ85 aircraft was being prepared for a charter flight from Perth Airport to Granny Smith, Australia. During the pre-flight checks, the flight crew did not identify that there was no pressure in the braking system and did not pressurise this system prior to engine start.
Around the time of the start of the final engine in the starting sequence, the aircraft began to roll forward.
The dispatcher noticed the aircraft rolling and alerted the crew. The crew attempted to use their foot brakes and the park-brake, however, there was no brake pressure. Around 18 seconds after the aircraft started to roll, it collided with movable aircraft stairs, which were in front of the Cobham terminal. The stairs struck the front of the aircraft, beneath the right pilot seat. Shortly after, NJW collided with a bollard in front of a light pole, then with the light pole itself.

Probable Cause:

Findings
- The crew did not effectively check the brake system pressure during either the originating checklist or the starting checklist. As a result, the crew did not identify that there was no brake
pressure prior to engine start.
- After engine start, the aircraft inadvertently rolled forward and collided with objects at the edge of the apron. The absence of brake pressure, the slope of the apron and the absence of a nose-wheel chock were contributory to the aircraft rolling forward.
- The operator's dispatch practices did not involve placing chocks on the nose-wheel for engine start. Although some ground handling procedures indicated nose-wheel chocks should be used, the operator’s training did not involve a step to place chocks on aircraft nose-wheels.
The absence of a nose-wheel chock fore of the aircraft reduced the defences against the aircraft rolling forward.
- The crew had a very limited opportunity to take corrective action before the aircraft collided with objects at the edge of the apron. It is likely that the short distance to the edge of the apron and the influence of surprise combined to reduce the crew’s ability to respond.

Accident investigation:
cover
Investigating agency: ATSB
Status: Investigation completed
Duration: 184 days (6 months)
Accident number: AO-2019-038
Download report: Final report

Sources:
» ATSB


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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 Perth Airport, WA et Granny Smith Airport, WA est de 712 km (445 miles).
Accident location: Exact; as reported in the official accident report.

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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