Talk:Happy Birthday Achievements/@comment-99.196.251.124-20150812120549/@comment-71.8.85.84-20150814040502

I was having the same problem. I was using the PRR PF8 II (18pwr) not the PRR PF8 (7 pwr) which is what the achievement calls for. Easy mistake to make since the teains are the same excpet one is a double and one is a single engine.