I have the third edition dated December 1971, REPRINTED April 1990. Do you understand the difference between "reprinted" - to print again, and "updated" - to bring up to date ? There are several online dictionaries available which will define the words for you.
BTW,on page 310 D.P.Davies talks about the limitations of the simulator. This would have been perfectly correct back in the early 1970s. These days we have zero flight time simulators and the realism is astounding.