diff --git a/conf/airframes/twinjet1.xml b/conf/airframes/twinjet1.xml
index 6a9bf2cf74..56af45ce01 100644
--- a/conf/airframes/twinjet1.xml
+++ b/conf/airframes/twinjet1.xml
@@ -39,8 +39,8 @@
   </section>
 
   <section name="adc" prefix="ADC_CHANNEL_">
-    <define name="IR1" value="AdcBank0(2)"/>
-    <define name="IR2" value="AdcBank0(1)"/>
+    <define name="IR1" value="AdcBank0(1)"/>
+    <define name="IR2" value="AdcBank0(2)"/>
     <define name="IR_TOP" value="AdcBank0(3)"/>
     <define name="GYRO_ROLL" value="AdcBank1(2)"/>
     <define name="GYRO_TEMP" value="AdcBank1(3)"/>
@@ -55,7 +55,7 @@
     <define name="ADC_TOP_NEUTRAL" value="512"/>
 
     <define name="HORIZ_SENSOR_ALIGNED" value="1"/>
-    <define name="IR1_SIGN" value="-1"/>
+    <define name="IR1_SIGN" value="1"/>
     <define name="IR2_SIGN" value="-1"/>
 
     <define name="ROLL_NEUTRAL_DEFAULT" value="5" unit="deg"/>