Definition
A bonded connection between two pieces of material — typically wood — held together by an adhesive. In aircraft construction, a glue joint must transfer load across the bond line so that the joined parts behave structurally as a single piece, with the adhesive carrying stress between the mating surfaces.
Plain English
The place where two parts are stuck together with glue, designed to be strong enough to act as one solid piece.
Context Anchor
Seen in aircraft wood structure inspection, repair, and construction, especially around ribs, spars, plywood skins, and scarf repairs.
Derivation
“Glue” comes from an old word meaning a sticky substance used to hold things together. “Joint” comes from a word meaning joined or connected. Together, the term points to the actual connection made by the adhesive, not just the glue material itself.
Why Pilots Care
A weak or defective glue joint can lead to structural failure under aerodynamic loads, directly affecting airworthiness.
Intuition Check
Do not think of a glue joint as glue simply filling a gap. In aircraft work, a good glue joint depends on close-fitting, clean surfaces held firmly together while the adhesive cures.
Example Sentence 1
During the annual inspection, the mechanic checked every visible glue joint on the wooden wing spar for signs of separation.
Example Sentence 2
After the fuselage repair, the glue joint was tested to confirm it could carry the required shear loads.