diff --git a/Aircraft/c172p/Models/c172p.xml b/Aircraft/c172p/Models/c172p.xml
index 6053e1af8..4656a90d6 100644
--- a/Aircraft/c172p/Models/c172p.xml
+++ b/Aircraft/c172p/Models/c172p.xml
@@ -149,7 +149,7 @@
   <interpolation>
    <entry>
     <ind>-1.0</ind>
-    <dep>15</dep>
+    <dep>-15</dep>
    </entry>
    <entry>
     <ind>0.0</ind>
@@ -157,7 +157,7 @@
    </entry>
    <entry>
     <ind>1.0</ind>
-    <dep>-20</dep>
+    <dep>20</dep>
    </entry>
   </interpolation>
   <center>
@@ -179,7 +179,7 @@
   <interpolation>
    <entry>
     <ind>-1.0</ind>
-    <dep>-20</dep>
+    <dep>20</dep>
    </entry>
    <entry>
     <ind>0.0</ind>
@@ -187,7 +187,7 @@
    </entry>
    <entry>
     <ind>1.0</ind>
-    <dep>15</dep>
+    <dep>-15</dep>
    </entry>
   </interpolation>
   <center>