diff --git a/aman/types/PerformanceData.py b/aman/types/PerformanceData.py
index a1b8fd7..0b58502 100644
--- a/aman/types/PerformanceData.py
+++ b/aman/types/PerformanceData.py
@@ -12,16 +12,16 @@ class PerformanceData:
         self.RodBelowFL100 = 2000.0
 
     def ias(self, altitude, distance):
-        if 24000 >= altitude:
+        if 24000 < altitude:
             return self.SpeedAboveFL240
-        elif 10000 >= altitude:
+        elif 10000 < altitude:
             return self.SpeedAboveFL100
-        elif 10000 < altitude and 5 < distance:
+        elif 10000 >= altitude and 5 < distance:
             return self.SpeedBelowFL100
         elif 5 >= distance:
             return self.SpeedApproach
         else:
-            return 220
+            return self.SpeedBelowFL100
 
     def __str__(self):
         return 'ICAO: ' + self.icao + ', FL240: ' + str(self.RodAboveFL240) + '@' + str(self.SpeedAboveFL240) + \