Pre-assembly of Components
Positioning Parts
Edge Distance
Definition
The term edge distance refers to the distance between the centre of a hole and the edge of the part. NOTE: formerly "section" and at Airbus "trusquinage".
Edge Distance Values
Each aircraft manufacturer has defined coefficients or values based on the fastener type, diameter, and assembly type. It depends on the type of loads applied to the assembled parts and the type of assembly.
Common minimum edge distance values (per AC)
Edge Distance Values
If this distance is too small, there is a risk of premature fatigue failure of the assembly.
The general value is between 2 and 2.5 × the fastener diameter.
The edge distance can also be the distance between a flange (rib, upstand, etc.) and the fastener centreline. In this case it is also referred to as the edge-to-fastener distance.
Edge Distance on Chamfered Parts
The distance between the chamfer and the hole centreline is generally 1.5 × the diameter.
Edge-to-fastener distance (bend, angle flange, etc.)
Commonly recommended minimum radius distance D values
06-01-02-Edge_Distance.pptx
Lauak
Created on June 23, 2026
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Transcript
Pre-assembly of Components
Positioning Parts
Edge Distance
Definition
The term edge distance refers to the distance between the centre of a hole and the edge of the part. NOTE: formerly "section" and at Airbus "trusquinage".
Edge Distance Values
Each aircraft manufacturer has defined coefficients or values based on the fastener type, diameter, and assembly type. It depends on the type of loads applied to the assembled parts and the type of assembly.
Common minimum edge distance values (per AC)
Edge Distance Values
If this distance is too small, there is a risk of premature fatigue failure of the assembly.
The general value is between 2 and 2.5 × the fastener diameter.
The edge distance can also be the distance between a flange (rib, upstand, etc.) and the fastener centreline. In this case it is also referred to as the edge-to-fastener distance.
Edge Distance on Chamfered Parts
The distance between the chamfer and the hole centreline is generally 1.5 × the diameter.
Edge-to-fastener distance (bend, angle flange, etc.)
Commonly recommended minimum radius distance D values