bug fix in is60()

2020-08-14 23:50:54 +02:00 · 2020-08-14 23:50:54 +02:00 · 2bdd638cef
commit 2bdd638cef
parent 93fc536926
1 changed files with 4 additions and 3 deletions
--- a/pyModeS/decoder/bds/bds60.py
+++ b/pyModeS/decoder/bds/bds60.py
@ -58,9 +58,10 @@ def is60(msg):
    # additional check knowing altitude
    if (mach is not None) and (ias is not None) and (common.df(msg) == 20):
        alt = common.altcode(msg)
-        ias_ = aero.mach2cas(mach, alt * aero.ft) / aero.kts
-        if abs(ias - ias_) > 20:
-            return False
+        if alt is not None:
+            ias_ = aero.mach2cas(mach, alt * aero.ft) / aero.kts
+            if abs(ias - ias_) > 20:
+                return False

    return True