Definition
A type of aircraft fastener that holds two parts together by clamping them under a controlled compressive load, typically using a threaded body, a sleeve, and a nut or collar that draws the joined materials tightly against each other. Tightening the fastener squeezes the materials between its head and its anchoring element, producing a clamped joint that resists loosening from vibration.
Plain English
A fastener that holds parts together by squeezing them tightly between its two ends, rather than relying on the threads alone to grip.
Context Anchor
Seen on aircraft cowlings, inspection panels, access covers, and other removable panels during preflight or maintenance.
Derivation
Compression comes from the Latin 'comprimere,' meaning 'to press together.' The name describes how the fastener works: it presses, or compresses, the joined parts against each other to hold them in place.
Why Pilots Care
Compression fasteners are common on access panels and cowlings. Knowing how they work helps a pilot or mechanic close a panel correctly during preflight or after maintenance, ensuring the panel is secure for flight.
Intuition Check
Do not confuse compression here with engine compression. In this term, compression means the fastener squeezes or clamps parts together.
Example Sentence 1
After replacing the inspection panel, the mechanic tightened each compression fastener until the cover sat flush against the airframe.
Example Sentence 2
Before flight, the pilot confirmed that every compression fastener on the cowling was fully engaged and locked.