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A breakdown of the conditions leading to the accidents cause and effect.
FIA report: Bianchi did not slow sufficiently - GPUpdate.net
A review of all the evidence and other information about the events leading up to Bianchi's accident has been carried out by the 10-man Accident Panel, appointed by the FIA. The Panel has issued a 396-page report on their findings with recommendations for improvements, many relevant to all of motorsport. This has been presented to the FIA World Motorsport Council.
Conclusions:
The review of the events leading up to Bianchi's accident indicate that a number of key issues occurred, which may have contributed to the accident, though none alone caused it:
1. The semi-dry racing line at T 7 was abruptly narrowed by water draining onto the track and flowing downhill along it. Both Sutil, and Bianchi one lap later, lost control at this point in T 7.
2. Sutil's car was in the process of being recovered by mobile crane when Bianchi approached Sectors 7 and 8, which include the part of T 7 where the recovery was taking place. Sectors 7 and 8 were subject to double yellow flags.
3. Bianchi did not slow sufficiently to avoid losing control at the same point on the track as Sutil.
4. If drivers adhere to the requirements of double yellow flags, as set out in Appendix H, Art. 2.4.5.1.b, then neither competitors nor officials should be put in immediate or physical danger.
5. The actions taken following Sutil's accident were consistent with the regulations, and their interpretation following 384 incidents in the preceding 8 years. Without the benefit of hindsight, there is no apparent reason why the Safety Car should have been deployed either before or after Sutil's accident.
6. Bianchi over-controlled the oversteering car, such that he left the track earlier than Sutil, and headed towards a point "up-stream" along the barrier. Unfortunately, the mobile crane was in front of this part of the barrier, and he struck and under-ran the rear of it at high speed.
7. During the 2 seconds Bianchi's car was leaving the track and traversing the run-off area, he applied both throttle and brake together, using both feet. The FailSafe algorithm is designed to over-ride the throttle and cut the engine, but was inhibited by the Torque Coordinator, which controls the rear Brake-by-Wire system. Bianchi's Marussia has a unique design of BBW, which proved to be incompatible with the FailSafe settings.
8. The fact that the FailSafe did not disqualify the engine torque requested by the driver may have affected the impact velocity; it has not been possible to reliably quantify this. However, it may be that Bianchi was distracted by what was happening and the fact that his front wheels had locked, and been unable to steer the car such that it missed the crane.
9. Bianchi's helmet struck the sloping underside of the crane. The magnitude of the blow and the glancing nature of it caused massive head deceleration and angular acceleration, leading to his severe injuries.
10. All rescue and medical procedures were followed, and their expediency are considered to have contributed significantly to the saving of Bianchi's life.
11. It is not feasible to mitigate the injuries Bianchi suffered by either enclosing the driver's cockpit, or fitting skirts to the crane. Neither approach is practical due to the very large forces involved in the accident between a 700kg car striking a 6500kg crane at a speed of 126kph. There is simply insufficient impact structure on a F1 car to absorb the energy of such an impact without either destroying the driver's survival cell, or generating non-survivable decelerations.
It is considered fundamentally wrong to try and make an impact between a racing car and a large and heavy vehicle survivable. It is imperative to prevent a car ever hitting the crane and/or the marshals working near it.
