It wasn't about Brown. It was the other "B" pilot, Billy Bishop. The movie was called "The Kid Who Couldn't Miss". The Canadian Senate held a series of hearings on the movie, and though they didn't censor it (although a lot of people wanted them too), they did have it reclassified a "docu-drama" with a disclaimer attached. It came out in 1982.
If you want more info, I suggest you check out the following URL
You will find a wealth of info there on the subject as well as Billy Bishop himself. And Yes, it's MY website, and I expect to be adding even more to it.
Just for you info. It was only shown in Canada once that I know of. You can still get a copy from the NFB, but it hasn't been shown on Canadian TV since, and to my knowledge, Paul Cowan (the producer) hasn't made any films since either.
Al Lowe 'Honourary Canadian Citizen'
"On the edge of destiny, you must test your strength. "