diff --git a/A320-main.xml b/A320-main.xml
index ae8d070f..15ecbee0 100644
--- a/A320-main.xml
+++ b/A320-main.xml
@@ -314,28 +314,28 @@
 		<!-- Multiplayer properties -->
 		<multiplay>
 			<generic>
-				<float n="0" alias="/controls/lighting/dome-norm" />
-				<float n="1" alias="/gear/gear[0]/steering-norm" />
-				<float n="2" alias="/engines/engine[0]/reverser-pos-norm" />
-				<float n="3" alias="/engines/engine[1]/reverser-pos-norm" />
-				<float n="4" alias="/fdm/jsbsim/hydraulics/elevator-l/final-deg" />
-				<float n="5" alias="/fdm/jsbsim/hydraulics/elevator-r/final-deg" />
-				<float n="6" alias="/fdm/jsbsim/hydraulics/aileron-l/final-deg" />
-				<float n="7" alias="/fdm/jsbsim/hydraulics/aileron-r/final-deg" />
-				<float n="8" alias="/fdm/jsbsim/hydraulics/rudder/final-deg" />
-				<float n="9" alias="/fdm/jsbsim/hydraulics/elevator-trim/final-deg" />
-				<float n="11" alias="/fdm/jsbsim/fcs/slat-pos-norm" />
-				<int n="2" alias="/controls/lighting/landing-lights[0]" />
-				<int n="3" alias="/controls/lighting/landing-lights[1]" />
-				<int n="4" alias="/controls/lighting/landing-lights[2]" />
-				<int n="5" alias="/sim/model/lights/nav-lights" />
-				<int n="6" alias="/sim/model/lights/logo-lights" />
-				<int n="7" alias="/sim/model/lights/strobe/state" />
-				<int n="8" alias="/controls/lighting/wing-lights" />
-				<int n="9" alias="/sim/model/lights/beacon/state" />
-				<int n="10" alias="/engines/engine[0]/contrail" />
-				<int n="11" alias="/engines/engine[1]/contrail" />
-				<int n="12" alias="/sharklet" />
+				<float n="0" alias="/controls/lighting/dome-norm"/>
+				<float n="1" alias="/gear/gear[0]/steering-norm"/>
+				<float n="2" alias="/engines/engine[0]/reverser-pos-norm"/>
+				<float n="3" alias="/engines/engine[1]/reverser-pos-norm"/>
+				<float n="4" alias="/fdm/jsbsim/hydraulics/elevator-l/final-deg"/>
+				<float n="5" alias="/fdm/jsbsim/hydraulics/elevator-r/final-deg"/>
+				<float n="6" alias="/fdm/jsbsim/hydraulics/aileron-l/final-deg"/>
+				<float n="7" alias="/fdm/jsbsim/hydraulics/aileron-r/final-deg"/>
+				<float n="8" alias="/fdm/jsbsim/hydraulics/rudder/final-deg"/>
+				<float n="9" alias="/fdm/jsbsim/hydraulics/elevator-trim/final-deg"/>
+				<float n="11" alias="/fdm/jsbsim/fcs/slat-pos-norm"/>
+				<int n="2" alias="/controls/lighting/landing-lights[0]"/>
+				<int n="3" alias="/controls/lighting/landing-lights[1]"/>
+				<int n="4" alias="/controls/lighting/landing-lights[2]"/>
+				<int n="5" alias="/sim/model/lights/nav-lights"/>
+				<int n="6" alias="/sim/model/lights/logo-lights"/>
+				<int n="7" alias="/sim/model/lights/strobe/state"/>
+				<int n="8" alias="/controls/lighting/wing-lights"/>
+				<int n="9" alias="/sim/model/lights/beacon/state"/>
+				<int n="10" alias="/engines/engine[0]/contrail"/>
+				<int n="11" alias="/engines/engine[1]/contrail"/>
+				<int n="12" alias="/sharklet"/>
 			</generic>
 		</multiplay>
 		
@@ -379,25 +379,25 @@
 	<payload>
 		<weight n="0">
 			<name>Cockpit Crew</name>
-			<weight-lb alias="/fdm/jsbsim/inertia/pointmass-weight-lbs[0]" />
+			<weight-lb alias="/fdm/jsbsim/inertia/pointmass-weight-lbs[0]"/>
 			<min-lb type="double">200</min-lb>
 			<max-lb type="double">440</max-lb>
 		</weight>
 		<weight n="1">
 			<name>Passengers</name>
-			<weight-lb alias="/fdm/jsbsim/inertia/pointmass-weight-lbs[1]" />
+			<weight-lb alias="/fdm/jsbsim/inertia/pointmass-weight-lbs[1]"/>
 			<min-lb type="double">1500</min-lb>
 			<max-lb type="double">27000</max-lb>
 		</weight>
 		<weight n="2">
 			<name>Forward Cargo</name>
-			<weight-lb alias="/fdm/jsbsim/inertia/pointmass-weight-lbs[2]" />
+			<weight-lb alias="/fdm/jsbsim/inertia/pointmass-weight-lbs[2]"/>
 			<min-lb type="double">300</min-lb>
 			<max-lb type="double">8765</max-lb>
 		</weight>
 		<weight n="3">
 			<name>Aft Cargo</name>
-			<weight-lb alias="/fdm/jsbsim/inertia/pointmass-weight-lbs[3]" />
+			<weight-lb alias="/fdm/jsbsim/inertia/pointmass-weight-lbs[3]"/>
 			<min-lb type="double">300</min-lb>
 			<max-lb type="double">8765</max-lb>
 		</weight>
@@ -540,7 +540,6 @@
 			<elevator-input>0</elevator-input>
 			<elevator-trim-fdm>0.0</elevator-trim-fdm>
 			<flap-pos type="int">0</flap-pos>
-			<ground-spoilers-armed type="bool">0</ground-spoilers-armed>
 			<rudder-trim-fdm>0.0</rudder-trim-fdm>
 			<speedbrake-arm>0</speedbrake-arm>
 			<slats>0</slats>
@@ -1370,7 +1369,7 @@
 						</and>
 					</condition>
 					<command>property-cycle</command>
-					<property>controls/flight/speedbrake</property>
+					<property>/controls/flight/speedbrake</property>
 					<value>0.0</value>
 					<value>1.0</value>
 				</binding>
@@ -1392,14 +1391,14 @@
 						</and>
 					</condition>
 					<command>property-cycle</command>
-					<property>controls/flight/speedbrake</property>
+					<property>/controls/flight/speedbrake</property>
 					<value>0.0</value>
 					<value>0.5</value>
 					<value>1.0</value>
 				</binding>
 				<binding>
 					<command>property-assign</command>
-					<property>controls/flight/speedbrake-arm</property>
+					<property>/controls/flight/speedbrake-arm</property>
 					<value>0</value>
 				</binding>
 			</key>
diff --git a/Models/FlightDeck/a320.flightdeck.xml b/Models/FlightDeck/a320.flightdeck.xml
index 9dd871b2..243143a2 100644
--- a/Models/FlightDeck/a320.flightdeck.xml
+++ b/Models/FlightDeck/a320.flightdeck.xml
@@ -4935,9 +4935,8 @@
 	<animation>
 		<type>rotate</type>
 		<object-name>SpdBrk</object-name>
-		<property>controls/flight/speedbrake</property>
+		<property>fdm/jsbsim/spoilers/speedbrake-nul</property>
 		<factor>45</factor>
-		<!--offset-deg>10</offset-deg-->
 		<axis>
 			<object-name>SpdBrk.axis</object-name>
 		</axis>
diff --git a/Nasal/libraries.nas b/Nasal/libraries.nas
index b60b87f2..a046043d 100644
--- a/Nasal/libraries.nas
+++ b/Nasal/libraries.nas
@@ -399,6 +399,31 @@ var flaptimer = maketimer(0.5, func {
 	}
 });
 
+controls.stepSpoilers = func(step) {
+	setprop("/controls/flight/speedbrake-arm", 0);
+	if (step == 1) {
+		deploySpeedbrake();
+	} else if (step == -1) {
+		retractSpeedbrake();
+	}
+}
+
+var deploySpeedbrake = func {
+	if (getprop("/controls/flight/speedbrake") < 0.5) {
+		setprop("/controls/flight/speedbrake", 0.5);
+	} else if (getprop("/controls/flight/speedbrake") < 1.0) {
+		setprop("/controls/flight/speedbrake", 1.0);
+	}
+}
+
+var retractSpeedbrake = func {
+	if (getprop("/controls/flight/speedbrake") > 0.5) {
+		setprop("/controls/flight/speedbrake", 0.5);
+	} else if (getprop("/controls/flight/speedbrake") > 0.0) {
+		setprop("/controls/flight/speedbrake", 0.0);
+	}
+}
+
 var slewProp = func(prop, delta) {
 	delta *= getprop("/sim/time/delta-realtime-sec");
 	setprop(prop, getprop(prop) + delta);
diff --git a/revision.txt b/revision.txt
index d314d87a..1a819b2b 100644
--- a/revision.txt
+++ b/revision.txt
@@ -1 +1 @@
-4604
\ No newline at end of file
+4605
\ No newline at end of file