From a9887d623891d123c46adae731e3b3e8d99d9635 Mon Sep 17 00:00:00 2001
From: Junzi Sun <junzi.sun@gmail.com>
Date: Sat, 18 Nov 2017 22:14:09 +0100
Subject: [PATCH] minor fix in bit sequence

---
 pyModeS/adsb.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pyModeS/adsb.py b/pyModeS/adsb.py
index 3c680dd..2c26c73 100644
--- a/pyModeS/adsb.py
+++ b/pyModeS/adsb.py
@@ -592,7 +592,7 @@ def airborne_velocity(msg):
 
     subtype = util.bin2int(msgbin[37:40])
 
-    if util.bin2int(msgbin[46:56]) == 0 or util.bin2int(msgbin[46:56]) == 0:
+    if util.bin2int(msgbin[46:56]) == 0 or util.bin2int(msgbin[57:67]) == 0:
         return None
 
     if subtype in (1, 2):