diff --git a/A-10-set.xml b/A-10-set.xml
index 0b2203c..8045a42 100644
--- a/A-10-set.xml
+++ b/A-10-set.xml
@@ -1059,6 +1059,8 @@ Fairchild A-10 simulation config.
 			</generator>
 		</APU>
 		<armament>
+			<master-arm-switch type="int">0</master-arm-switch>
+			<master-arm type="int">0</master-arm>
 			<trigger type="bool">false</trigger>
 			<trigger-gun type="bool">false</trigger-gun>
 			<trigger-hydra-1 type="bool">false</trigger-hydra-1>
diff --git a/Models/Cockpit/A-10-armament-panel.xml b/Models/Cockpit/A-10-armament-panel.xml
index 1635948..742fbf0 100644
--- a/Models/Cockpit/A-10-armament-panel.xml
+++ b/Models/Cockpit/A-10-armament-panel.xml
@@ -8,7 +8,7 @@
 	<animation>
 		<object-name>master-arm-switch</object-name>
 		<type>knob</type>
-		<property>controls/armament/master-arm</property>
+		<property>controls/armament/master-arm-switch</property>
 		<factor>30</factor>
 		<drag-direction>vertical</drag-direction>
 		<center>
@@ -20,7 +20,7 @@
 		<action>
             <binding>
                 <command>property-adjust</command>
-                <property>controls/armament/master-arm</property>
+                <property>controls/armament/master-arm-switch</property>
                 <factor>1</factor>
                 <min>-1</min>
                 <max>1</max>
diff --git a/Nasal/WEAPONS/fire-control.nas b/Nasal/WEAPONS/fire-control.nas
index bbf420b..52c709d 100755
--- a/Nasal/WEAPONS/fire-control.nas
+++ b/Nasal/WEAPONS/fire-control.nas
@@ -1244,4 +1244,6 @@ var getCompleteRadarTargetsList = func {
 	# A list of all MP/AI aircraft/ships/surface-targets around the aircraft, including those that is outside radar line of sight etc..
 
 	return radar_system.getCompleteList();
-}
\ No newline at end of file
+}
+
+var masterArmSwitch = "controls/armament/master-arm-switch";