diff --git a/Aircraft/c172-set.xml b/Aircraft/c172-set.xml
index b38948f56..57f1513d7 100644
--- a/Aircraft/c172-set.xml
+++ b/Aircraft/c172-set.xml
@@ -16,7 +16,11 @@ October 23 2001 John Check, fgpanels@rockfish.net
  
   <flight-model>jsb</flight-model>
   <aero>c172</aero>
-  <sound>true</sound>
+
+  <sound>
+   <audible>true</audible>
+   <path>Aircraft/c172/c172-sound.xml</path>
+  </sound>
 
   <panel>
    <path>Aircraft/c172/Panels/c172-vfr-panel.xml</path>
diff --git a/Aircraft/c182-set.xml b/Aircraft/c182-set.xml
index 42be3314a..266e0546c 100644
--- a/Aircraft/c182-set.xml
+++ b/Aircraft/c182-set.xml
@@ -16,7 +16,11 @@ October 23 2001 John Check, fgpanels@rockfish.net
  
   <flight-model>jsb</flight-model>
   <aero>c182</aero>
-  <sound>true</sound>
+
+  <sound>
+   <audible>true</audible>
+   <path>Aircraft/c182/c182-sound.xml</path>
+  </sound>
 
   <panel>
    <path>Aircraft/c182/Panels/c182s-panel.xml</path>
diff --git a/Aircraft/c310-set.xml b/Aircraft/c310-set.xml
index 8f460e9ff..e4063d7f2 100644
--- a/Aircraft/c310-set.xml
+++ b/Aircraft/c310-set.xml
@@ -16,7 +16,11 @@ October 23 2001 John Check, fgpanels@rockfish.net
   
   <flight-model>jsb</flight-model>
   <aero>c310</aero>
-  <sound>true</sound>
+
+  <sound>
+   <audible>true</audible>
+   <path>Aircraft/c310/c310-sound.xml</path>
+  </sound>
 
   <panel>
   <path>Aircraft/c310/c310-vfr-panel.xml</path>