Definition
A repair to a sandwich-construction panel (such as a honeycomb structure) in which damage extends through only one of the two face sheets and into the core, leaving the opposite face sheet intact. The damaged face skin and affected core material are removed and replaced, while the undamaged side serves as the structural backing for the repair.
Plain English
A fix used on a panel made like a sandwich -- two thin skins with a lightweight filler in between -- when only one of the skins is damaged. You repair the damaged skin and the filler underneath it, but you leave the good skin on the other side alone.
Context Anchor
Seen in aircraft maintenance and repair records for composite, honeycomb, or other sandwich-panel structures.
Derivation
Single-face means one of the two outer surfaces (faces) of a sandwich panel. The term simply describes the scope of the repair: only one face is worked on.
Why Pilots Care
Maintains structural strength and aerodynamic balance so the component remains airworthy.
Intuition Check
Do not read “single-face” as a cosmetic repair to the side you can see. Here it means a structural repair limited to one outer sheet of a layered aircraft panel.
Example Sentence 1
The technician performed a single-face repair on the rudder honeycomb panel after finding impact damage limited to the outer skin.
Example Sentence 2
Single-face repair was approved because the damage depth stayed within limits and did not reach the opposite face.