Most of the engine’s elements are ferrous (bearings, shafts, etc.) and the continuous friction between them will induce gradual wear with time. Small magnetic plugs are fitted into the lubrication system at specific positions to trap the worn residuals. The accumulation of debris on the magnetic plug will indicate the source and the rate of wear and will trigger a warning of impending failure without having to remove the filters for inspection. Electrical contacts will be fitted to the magnetic plugs so that in case of significant build-up, the circuit closes and activates a warning light in the flight deck.
Your Notes (not visible to others)
This question has appeared on the real examination, you can find the related countries below.
A cookie is a small text file that a website saves on your computer or mobile device when you visit the site. It enables the website to remember your actions and preferences (such as login, language, font size and other display preferences) over a period of time, so you don’t have to keep re-entering them whenever you come back to the site or browse from one page to another.
How to control cookies
You can control and/or delete cookies as you wish – for details, see aboutcookies.org. You can delete all cookies that are already on your computer and you can set most browsers to prevent them from being placed. If you do this, however, you may have to manually adjust some preferences every time you visit a site and some services and functionalities may not work.