diff --git a/AircraftConfig/acconfig.nas b/AircraftConfig/acconfig.nas
index ee17ff7a..99980a16 100644
--- a/AircraftConfig/acconfig.nas
+++ b/AircraftConfig/acconfig.nas
@@ -117,6 +117,13 @@ var mismatch_chk = func {
 			error_mismatch.open();
 		}
 		print("Mismatch: 0x121");
+	} else if (getprop("/gear/gear[0]/wow") == 0 or getprop("/position/altitude-ft") >= 50000 or getprop("/systems/acconfig/libraries-loaded") == 0) {
+		setprop("/systems/acconfig/mismatch-code", "0x223");
+		setprop("/systems/acconfig/mismatch-reason", "Aircraft initialization failed");
+		if (getprop("/systems/acconfig/out-of-date") != 1) {
+			error_mismatch.open();
+		}
+		print("Mismatch: 0x223");
 	}
 }
 
diff --git a/AircraftConfig/error-mismatch.xml b/AircraftConfig/error-mismatch.xml
index f29a8a2b..97651955 100644
--- a/AircraftConfig/error-mismatch.xml
+++ b/AircraftConfig/error-mismatch.xml
@@ -88,7 +88,11 @@
 		</text>
 		<text>
 			<halign>left</halign>
-			<label>3) Contact "Wecsje" or "it0uchpods" on the FlightGear Forums.</label>
+			<label>3) Load the aircraft on ground, not in air.</label>
+		</text>
+		<text>
+			<halign>left</halign>
+			<label>4) Contact "Wecsje" or "it0uchpods" on the FlightGear Forums.</label>
 		</text>
 	</group>
 	
diff --git a/Nasal/libraries.nas b/Nasal/libraries.nas
index 76491ba3..5e8adffd 100644
--- a/Nasal/libraries.nas
+++ b/Nasal/libraries.nas
@@ -404,3 +404,5 @@ var noseLoop = maketimer(0.1, func {
 		# do nothing
 	}
 });
+
+setprop("/systems/acconfig/libraries-loaded", 1);
diff --git a/revision.txt b/revision.txt
index f083bc3c..98be9308 100644
--- a/revision.txt
+++ b/revision.txt
@@ -1 +1 @@
-1516
\ No newline at end of file
+1517
\ No newline at end of file