Definition
An abnormal condition in an electrical system in which current flows along an unintended path or fails to flow along its intended path. Common faults include short circuits (current bypassing the normal load), open circuits (a broken path that stops current flow), and ground faults (current leaking to the airframe or another grounded structure).
Plain English
Something has gone wrong in the electrical wiring or components — either electricity is taking a path it shouldn't, or it has stopped flowing where it should.
Context Anchor
In a turboprop airplane, a pilot may encounter this term when reviewing electrical system warnings, generator problems, battery problems, circuit breaker actions, or abnormal procedures.
Derivation
Fault comes from the Latin fallere, meaning 'to deceive' or 'fail.' In engineering it carries the sense of a failure or defect — the system is not behaving as designed.
Why Pilots Care
Left unresolved, an electrical fault can disable flight instruments, navigation, lighting, or engine controls.
Intuition Check
Do not read fault as personal blame or pilot error. Here, a fault means a defect or abnormal condition in the electrical system.
Example Sentence 1
When the generator caution light illuminated, the crew suspected an electrical fault and ran the appropriate checklist.
Example Sentence 2
During the after-start checklist the crew noticed an electrical fault that tripped the main bus tie.