On the belt line of the automatic pilot, there is a hollow tube. Now that is the manual inflation nozzle. Pull it out and blow on it.
10 seconds sound clip from the Airplane (1980) movie soundboard.
You can hear this line at 00:44:39 in the Blu-ray version of the movie.
Quote context
[...]
- 35000 feet. No, wait. 34000 feet.
- No, it's dropping. It's dropping fast. Why is it doing that?
- Oh, my God! The automatic pilot, it's deflating!
- What the hell's going on up there?
- Elaine?
- Elaine, you're a member of this crew.
- Can you face some unpleasant facts?
- No.
[...]