Definition
Magnetic chip detectors are small magnetic plugs installed in an engine's oil system that capture ferrous metal particles circulating in the oil. They are inspected periodically to detect early signs of internal engine wear or component failure, since metal flakes or chips on the detector indicate that parts inside the engine are breaking down.
Plain English
A magnet placed in the engine's oil that catches tiny metal pieces. If you find metal stuck to it, something inside the engine is wearing out or breaking.
Context Anchor
Seen in aircraft maintenance, oil-system inspections, and some cockpit warning systems that alert the pilot to metal in the engine or gearbox oil.
Derivation
Chip' here means a small fragment of metal worn or broken off an internal part — the same sense as a chip off a block. A magnetic detector simply uses a magnet to catch any iron-based chips floating in the oil.
Why Pilots Care
Early detection of metal particles allows maintenance before wear leads to engine failure or in-flight shutdown.
Intuition Check
Do not read chip here as an electronic part. In this term, a chip is a small piece of metal that has broken or worn off inside the aircraft’s machinery.
Example Sentence 1
During the oil change, the mechanic pulled the magnetic chip detectors and found them clean, which was a good sign of internal engine health.
Example Sentence 2
A lit chip detector warning light prompted the pilot to divert and land for an engine check.