Perilous arrival, something flipped onto floor at end of flight (7,7)
I believe the answer is:
pancake landing
'something flipped onto floor at end of flight' is the definition.
I can't judge whether this definition defines the answer.
'perilous arrival' is the wordplay.
'perilous' becomes 'pancake' (I can't justify this - if you can you should believe this answer much more).
'arrival' becomes 'landing' (landing is a kind of arrival).
'pancake'+'landing'='PANCAKE LANDING'
Can you help me to learn more?
(Other definitions for pancake landing that I've seen before include "Crash course for pilot" , "Emergency touchdown" , "happening on Shrove Tuesday" .)