Patent ID: 8328606

Claim:
An assembly for detecting unacceptably low cabin pressure, comprising: an auto channel that closes a first switch upon sensing that a cabin pressure falls below a set value; a monitor channel that closes a second switch upon sensing that the cabin pressure falls below the set value; a first independent limit switch wired to the auto channel; a second independent limit switch wired to the monitor channel, wherein the assembly closes an outflow valve, the outflow valve closing when either (i) both the first independent limit switch and the second independent limit switch sense that the cabin pressure falls below the set value, or (ii) the first independent limit switch senses that the cabin pressure falls below the set value and the auto channel senses that the cabin pressure falls below the set value, or (iii) the second independent limit switch senses that the cabin pressure falls below the set value and the monitor channel senses that the cabin pressure falls below the set value.