pull up 3k,
The FAA maximum approved capacity for a BAe 146-100 is 94 passengers and for the -200/300 is 108 passengers. The -300 capacity is based on door flow rates confirmed during -200 certification. Those numbers are based on using only two of the four doors. The flow rate is 36 persons per minute through each door.
The BAe 146-100 floats tail down with one wing tip in the water, removing one door from the escape equation. This is established by using appropriate models. The larger -200 and -300 are less of a problem.
The FAA-approved slide raft fit, based on FAR 121 operating rules, limits the aircraft capacity to the overload capacity of two of the three available slide rafts. This allows for an unserviceability of one of the available slide rafts. In the case of the BAe 146-100/RJ 70, the limit is 68 for slide raft only configuration.
Other regulators have different rules.
Stay Alive.