Potential initial event 7): Suspension bar attachment failure
This potential initial event may have two main different origins:
1. Detachment of suspension bar fitting from the airframe: such a detachment could be due to failure of
attachment fitting bolts.
Airbus Helicopters is finalizing additional calculations and fatigue tests. Conclusions are expected in
the beginning of June 2016.
2. Displacement and disengagement of one suspension bar pin due to the absence of safety pins
Dedicated tests are being done to further assess this scenario. Results are expected by end of June
2016.
The AIBN investigation team is still searching for the missing parts from the front suspension bar at the
accident site.
At this stage of the investigation, Airbus Helicopters considers that this potential initial event is not
contradicted by any available technical evidence.
For all potential initial events, analysis of the helicopter’s maintenance history should support a better
understanding of the most likely causes.
Airbus Helicopters will provide updated information as the investigation progresses.