fix some bugs in the runway manager during the ETA calculation

aman/config/AirportSequencing.py

@@ -74,16 +74,16 @@ class AirportSequencing:
                 return runway
         return None
 
-    def findDependentRunway(self, identifier : str):
+    def findDependentRunways(self, identifier : str):
         # runway is unknown
         index = self.runwayIndex(identifier)
         if 0 > index:
-            return None
+            return []
 
         # search the dependency pair
+        dependencies = []
         for dependency in self.RunwayDependencies:
-            if index == dependency[0]:
-                return self.ActiveArrivalRunways[dependency[1]]
+            if index == dependency[0] and not self.ActiveArrivalRunways[dependency[1]] in dependencies:
+                dependencies.append(self.ActiveArrivalRunways[dependency[1]])
 
-        # no dependencies found
-        return None
+        return dependencies