i passed chalkie by in his chicken coop and reckoned that if i shouted loud enough he might actually hear me , even above the avon , but as this seemed to be a full blown emergency i wanted everyone to know about it , not just him , so i was quickly on to guard , the international air distress frequency ( 121.5mhz ) channel , which was reserved for emergencies only , and so it was mayday , mayday , mayday , this is lady s calling el campo tower , i have just lost virtually all my flight controls , but i am at the moment in stable flight at 200knots .