diff --git a/Engines/cfm56-5b4_1.xml b/Engines/cfm56-5b4_1.xml
index 85ff55bf..f9e74fb0 100644
--- a/Engines/cfm56-5b4_1.xml
+++ b/Engines/cfm56-5b4_1.xml
@@ -11,7 +11,7 @@
 	<ignitionn2>22.2</ignitionn2>
 	<n1spinup>0.19</n1spinup>
 	<n2spinup>1.85</n2spinup>
-	<n1startrate>0.573</n1startrate>
+	<n1startrate>0.503</n1startrate>
 	<n2startrate>1.127</n2startrate>
 	<idlen1>18.9</idlen1>
 	<idlen2>59.4</idlen2>
diff --git a/Engines/cfm56-5b4_2.xml b/Engines/cfm56-5b4_2.xml
index e82598bb..75e97427 100644
--- a/Engines/cfm56-5b4_2.xml
+++ b/Engines/cfm56-5b4_2.xml
@@ -11,7 +11,7 @@
 	<ignitionn2>22.2</ignitionn2>
 	<n1spinup>0.19</n1spinup>
 	<n2spinup>1.85</n2spinup>
-	<n1startrate>0.573</n1startrate>
+	<n1startrate>0.503</n1startrate>
 	<n2startrate>1.127</n2startrate>
 	<idlen1>18.9</idlen1>
 	<idlen2>59.4</idlen2>
diff --git a/Engines/leap1a26_1.xml b/Engines/leap1a26_1.xml
index ddcf9d94..190f5e61 100644
--- a/Engines/leap1a26_1.xml
+++ b/Engines/leap1a26_1.xml
@@ -11,7 +11,7 @@
 	<ignitionn2>22.2</ignitionn2>
 	<n1spinup>0.19</n1spinup>
 	<n2spinup>1.85</n2spinup>
-	<n1startrate>0.573</n1startrate>
+	<n1startrate>0.503</n1startrate>
 	<n2startrate>1.127</n2startrate>
 	<idlen1>18.9</idlen1>
 	<idlen2>59.4</idlen2>
diff --git a/Engines/leap1a26_2.xml b/Engines/leap1a26_2.xml
index 1c8b4894..4efb1ab2 100644
--- a/Engines/leap1a26_2.xml
+++ b/Engines/leap1a26_2.xml
@@ -11,7 +11,7 @@
 	<ignitionn2>22.2</ignitionn2>
 	<n1spinup>0.19</n1spinup>
 	<n2spinup>1.85</n2spinup>
-	<n1startrate>0.573</n1startrate>
+	<n1startrate>0.503</n1startrate>
 	<n2startrate>1.127</n2startrate>
 	<idlen1>18.9</idlen1>
 	<idlen2>59.4</idlen2>
diff --git a/Engines/pw1127g_1.xml b/Engines/pw1127g_1.xml
index 5a73bd62..5e5866cb 100644
--- a/Engines/pw1127g_1.xml
+++ b/Engines/pw1127g_1.xml
@@ -11,7 +11,7 @@
 	<ignitionn2>22.2</ignitionn2>
 	<n1spinup>0.19</n1spinup>
 	<n2spinup>1.85</n2spinup>
-	<n1startrate>0.573</n1startrate>
+	<n1startrate>0.503</n1startrate>
 	<n2startrate>1.127</n2startrate>
 	<idlen1>18.9</idlen1>
 	<idlen2>59.4</idlen2>
diff --git a/Engines/pw1127g_2.xml b/Engines/pw1127g_2.xml
index cdcf0897..304a3458 100644
--- a/Engines/pw1127g_2.xml
+++ b/Engines/pw1127g_2.xml
@@ -11,7 +11,7 @@
 	<ignitionn2>22.2</ignitionn2>
 	<n1spinup>0.19</n1spinup>
 	<n2spinup>1.85</n2spinup>
-	<n1startrate>0.573</n1startrate>
+	<n1startrate>0.503</n1startrate>
 	<n2startrate>1.127</n2startrate>
 	<idlen1>18.9</idlen1>
 	<idlen2>59.4</idlen2>