Idiom:

Quick fix ( temporary solution )

Hit the book:

Subtle

Glide

Shudder

Backfiring

Pressurization

Precautionary

Construe

Droll

Subtle noises are not the ones to worry about

Complete silence—suggesting all/both the engines have failed—would probably concern most. But even then, all is not lost—if the engines can't be restarted, planes can actually glide for a remarkable distance. After Air Transat Flight 236 lost power on August 24, 2001, it managed an emergency landing in the Azores after gliding for 120km.