Originally Posted by
what next
According to your report they applied the emergency brake, not the parking brake. Applying the parking brake in a Citation whilst in motion will achieve nothing that the brake pedals won't achieve on their own: It closes a valve that traps the brake pressure (which needs to be applied with the pedals first) inside the brake lines. Exactly as in a Cessna 152 many piots will know from their early training days. If you just pull the parking brake lever nothing at all will happen. But the Citations do also have a nitrogen operated emergency brake that can be used when there is no hydraulic pressure. It will not provide the same braking power as the normal brake and no antiskid either. What we know so far about this accident is that they did not try to stop but attempted to get airborne.
I think the 328 system is one and the same:
Should the normal braking system fail, an emergency braking facility powered by the
auxiliary hydraulic system is available. The emergency braking system is also used
to operate the parking brake. The pressure required to operate the
emergency/parking brake system is stored in an emergency/park brake accumulator.
If pressure is still available in the pressure line of the main hydraulic system when the
emergency/parking brake is applied, the pressure will automatically charge the
emergency/parking brake accumulator via the pilot check valve.
However, I fully understand your explanation of the Cessna system and agree it seems unlikely