diff --git a/Systems/a320-pneumatic.xml b/Systems/a320-pneumatic.xml
index c1b200c5..acc3ce95 100644
--- a/Systems/a320-pneumatic.xml
+++ b/Systems/a320-pneumatic.xml
@@ -560,11 +560,11 @@
 				/systems/pneumatics/source/apu-psi ne 0
 			</test>
 			<test logic="AND" value="3"> <!-- left prv -->
-				/systems/pneumatics/psi/engine-1-downstream-opv ne 0
+				/systems/pneumatics/psi/engine-1-downstream-opv lt /systems/pneumatics/psi/crossbleed-duct-right
 			</test>
 			<test logic="AND" value="4"> <!-- right crossbleed -->
 				/systems/pneumatics/valves/crossbleed-valve ne 0
-				/systems/pneumatics/psi/crossbleed-duct-right ne 0
+				/systems/pneumatics/psi/crossbleed-duct-right ge /systems/pneumatics/psi/engine-1-downstream-opv
 			</test>
 		</switch>
 		
@@ -580,11 +580,11 @@
 				/systems/pneumatics/valves/apu-bleed-valve ne 0
 			</test>
 			<test logic="AND" value="3"> <!-- right prv -->
-				/systems/pneumatics/psi/engine-2-downstream-opv ne 0
+				/systems/pneumatics/psi/engine-2-downstream-opv lt /systems/pneumatics/psi/crossbleed-duct-left
 			</test>
 			<test logic="AND" value="4"> <!-- left crossbleed -->
 				/systems/pneumatics/valves/crossbleed-valve ne 0
-				/systems/pneumatics/psi/crossbleed-duct-left ne 0
+				/systems/pneumatics/psi/crossbleed-duct-left ge /systems/pneumatics/psi/engine-2-downstream-opv
 			</test>
 		</switch>