Just a guess:
33°=30° (rec max bank angle in CommAirTransport)+10% margin
67° bank angle limitation due to max g-load limitation in clean config (+2.5g).
EDIT:you need to detail your question...I understood that you wanna know why these exact values instead of others like e.g. 35° and 65°...
Last edited by shortfuel; 15th Jul 2010 at 17:43.