Definition
A method of attaching fabric covering to the wing ribs of an aircraft using a series of individual knotted loops of waxed cord, with each loop tied off separately rather than being part of a continuous run of cord. Each stitch passes through the fabric on both sides of the rib and is secured with a modified seine knot before the next stitch is started.
Plain English
A way of sewing the fabric skin of a wing to the ribs underneath by tying each stitch off on its own, one at a time, instead of running one long thread through all of them.
Context Anchor
Seen in fabric-covered aircraft maintenance, restoration, and inspection, especially when checking how the wing fabric is attached to the ribs.
Derivation
The name describes the method: each stitch is a single, self-contained loop. 'Rib stitching' refers to the row of stitches that runs along each wing rib to hold the fabric down against the airflow.
Why Pilots Care
Proper single-loop rib stitching keeps the fabric from ballooning or tearing in flight, preserving wing shape and structural integrity.
Intuition Check
Single-loop does not mean the whole rib is held by one stitch. It means each stitch location uses one loop of cord to hold the fabric to the rib.
Example Sentence 1
The mechanic used single-loop rib stitching on the recovered wing so that any future stitch failure would stay isolated.
Example Sentence 2
Single-loop rib stitching was chosen for the elevator because it provides adequate holding strength for this light aircraft.