Did they do the “ 100% grade granite rockface at 435 knts” test. I know that FDRs are rugged and the storage media is well protected, but that sudden stop could of well exceeded 3400g.
“Did they do the “ 100% grade granite rockface at 435 knts” test. I know that FDRs are rugged and the storage media is well protected, but that sudden stop could of well exceeded 3400g.”
1. In a crash, there is some ‘cushion’ to the impact as the FDR is slowed as the plane hits the granite so the FDR does not impact the granite at the speed just before impact.
2. The CSMU is encased in an aluminum shell inside the SS box thus giving another level of energy dissipation before the CSMU ‘impacts’.
So, the ‘sudden stop against granite’ that you mention does not apply the the CMSU, the only component of the black box that is required to survive the crash.