AC21365 From United States of America, joined Jul 2005, 402 posts, RR: 0 Reply 2, posted (7 years 3 months 3 weeks 3 days 6 hours ago) and read 2042 times:
Map some keys to the 'tailhook' and 'wing fold' buttons, typically those open cargo doors and do other things, it just depends on the aircraft. By default, Shift+E opens the main exit door.
I did read somewhere that if the aircraft has support for it, the Shift+E+1 or 2 opens individual doors. Like I said though, it depends on whether those features were built into the aircraft.