Definition
A mechanical wire splice in which the bared ends of two wires are crossed and then wrapped tightly around each other in opposite directions to form a strong, electrically continuous joint. It is used in aircraft only on wires that are not subject to vibration or movement, and the completed splice is typically soldered and insulated.
Plain English
A way of joining two wires by crossing the bare ends and twisting each one around the other so the joint holds together both physically and electrically.
Context Anchor
Seen in aircraft electrical maintenance, wiring repair, and training discussions, especially when learning older or basic wire-splicing methods.
Derivation
Named after the Western Union telegraph company, which developed and standardized this splice in the 19th century for joining telegraph wires that had to carry signal current over long, taut spans.
Why Pilots Care
Creates strong, vibration-resistant connections that maintain electrical continuity in critical aircraft systems.
Intuition Check
Do not read “Western Union” as a direction or a general business name here. In this term, it names a specific wire-splicing method. Also, a neat twist is not automatically an approved aircraft repair; the maintenance instructions decide what kind of splice may be used.
Example Sentence 1
The mechanic used a Western Union splice to rejoin the broken wire before soldering and insulating the connection.
Example Sentence 2
During the preflight check the mechanic inspected the Western Union splice in the landing light circuit for tightness.