From 558c321f9439eee30605889749c68cb0490e6d1e Mon Sep 17 00:00:00 2001
From: Mathias Froehlich <Mathias.Froehlich@web.de>
Date: Thu, 8 Sep 2011 19:34:15 +0200
Subject: [PATCH] Fix problem with the A320 family not starting up correctly.

---
 Nasal/aircraft.nas | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Nasal/aircraft.nas b/Nasal/aircraft.nas
index 7c88f8d3d..a8c2b08bc 100644
--- a/Nasal/aircraft.nas
+++ b/Nasal/aircraft.nas
@@ -846,7 +846,7 @@ var tyresmoke = {
 	},
 	update: func {
 		var rollspeed = me.get_rollspeed();
-		var vert_speed = (me.vertical_speed) ? me.vertical_speed.getValue() : -999;
+		var vert_speed = (me.vertical_speed) != nil ? me.vertical_speed.getValue() : -999;
 		var groundspeed = me.speed.getValue();
 		var friction_factor = me.friction_factor.getValue();
 		var wow = me.wow.getValue();