DL_Mech wrote:The L-1011 used a logic control box to flush the forward and aft lavatories. The box contained pump control circuits, fail sensing and timing circuits . This allowed three motors to service five lavatories. In the event of a failure, one pump was sufficient to flush all five lavatories. Normal operation cycled through the three motors in sequence.
The MD-11 had a traditional vacuum waste system which used a dual processor waste control unit. The control unit monitored sensors, operated vacuum pumps and shut down blocked lavatories. It also determined when cabin differential pressure was used to flush the lavatories vs. using the two installed vacuum pumps.
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