There are four physically separate service centers. The Forward Electronics Service Center (FESC), under the cockpit floor, is the location of the main avionics bay. Ahead of the Forward Cargo Compartment is the Environmental Control Center (ECS). Behind the Forward Cargo is the Mid Electrical Service Center (MESC), and further back, near the main wheels, is the Hydraulics Service Center.
The ECS and Hydraulics Service Center are unpressurized.
Only the FESC and MESC - the electrical centers - are accessible in flight.
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