code: def ias60(msg):
      
      d = hex2bin(data(msg))
  
      if d[12] == '0':
          return None
  
      ias = bin2int(d[13:23])    # kts
      return ias
docs: Indicated airspeed
  
      Args:
          msg (String): 28 bytes hexadecimal message (BDS60) string
  
      Returns:
          int: indicated airspeed in knots