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A320FlyGuy
Topic Author
Posts: 283
Joined: Wed May 16, 2012 8:31 pm

MD-11 Lavatory System

Wed Jun 03, 2020 3:05 am

Hey Guys,

I’m wondering if anyone can confirm something for me.

The L-1011 had a computer in the avionics bay that monitored the flush motors and could detect a failure and subsequently have an adjacent flush motor take over to the keep the labs in service. I was curious if the MD-11 had a similar system.

Thanks.
My other car is an A320-200
 
Max Q
Posts: 8452
Joined: Wed May 09, 2001 12:40 pm

Re: MD-11 Lavatory System

Wed Jun 03, 2020 10:11 am

Amazing!


Typical Lockheed thoughtful design
The best contribution to safety is a competent Pilot.


GGg
 
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DL_Mech
Posts: 2495
Joined: Fri Feb 18, 2000 7:48 am

Re: MD-11 Lavatory System

Wed Jun 03, 2020 10:12 am

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.
This plane is built to withstand anything... except a bad pilot.
 
A320FlyGuy
Topic Author
Posts: 283
Joined: Wed May 16, 2012 8:31 pm

Re: MD-11 Lavatory System

Wed Jun 03, 2020 1:45 pm

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.


That’s perfect. Thanks for that answer.
My other car is an A320-200

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