Rocio,
Thanks for asking your question to planDisney!
A good friend of mine,
Kristin C. from planDisney recently
answered this very question!
She is the best, isn't she? So no, there is no weight or height limit on
Avatar Flight of Passage at
Disney's Animal Kingdom Theme Park.
But as Kristin points out, and I can confirm having been on the attraction several times, the individual ride vehicles can be a bit restrictive. I am only 5' 10", but I don't think that his height will be an issue. The restraints around my waist, however, can be a bit snug, so it is hard to know for sure if he will be comfortable or not. While I felt like the ride "hugged" me, I never felt claustrophobic or too cramped. I would guess that while the 4-to-5-minute ride won't feel like a lounge by the pool for him, it should be fine, and well worth the experience!
BONUS TIP #1
There is a "test vehicle" in front of the attraction where he can hop on to test it out before waiting in line.
BONUS TIP #2
There is a minimum height requirement of 44" for Avatar Flights of Passage.
Have a Magical Vacation!
Doug