Igniter seal arrangement for a combustion chamber

An igniter seal arrangement for a combustion chamber, the combustion chamber comprising a combustion chamber wall,

• the combustion chamber wall having a first surface and a second surface, the combustion chamber wall comprises an outer wall and an inner wall spaced from the outer wall, the first surface is an outer surface of the outer wall and the second surface is an inner surface of the inner wall, the outer wall and the inner wall are connected by a first end wall at a first end, a second end wall at a second end, a first edge wall at a first edge and a second edge wall at a second edge to form a wall segment
• a boss projecting from the first surface of the combustion chamber wall, the boss having a platform on a remote end of the boss, the boss comprising a wall extending from the first surface of the combustion chamber wall, the platform being arranged on a remote end of the wall, the wall being arranged at and supporting a periphery of the platform, the platform having an inner surface spaced from the first surface of the combustion chamber wall to define a chamber between the first surface of the combustion chamber wall, the inner surface of the platform and the wall, the platform having an outer surface facing away from the first surface of the combustion chamber wall, an aperture extending through the combustion chamber wall from the outer surface of the platform of the boss to the second surface of the combustion chamber wall, first and second L-shape rails extending from the platform and a sealing member having a first edge and a second edge locatable between the outer surface of the platform and the first and second L-shape rails, and the sealing member having an aperture to receive an igniter,
• the outer wall, the inner wall, the first end wall, the second end wall, the first end wall, the second end wall and the boss is a unitary, monolithic, structure.

A method of manufacturing an igniter seal arrangement for a combustion chamber, the combustion chamber comprising a combustion chamber wall, the combustion chamber wall having a first surface and a second surface, a boss projecting from the first surface of the combustion chamber wall, the boss having a platform on a remote end of the boss, the boss comprising a wall extending from the first surface of the combustion chamber wall, the platform being arranged on a remote end of the wall, the wall being arranged at and supporting a periphery of the platform, the platform having an inner surface spaced from the first surface of the combustion chamber wall to define a chamber between the first surface of the combustion chamber wall, the inner surface of the platform and the wall, the platform having an outer surface facing away from the first surface of the combustion chamber wall, an aperture extending through the combustion chamber wall from the outer surface of the platform of the boss to the second surface of the combustion chamber wall, first and second L-shape rails extending from the platform and a sealing member having a first edge and a second edge locatable between the outer surface of the platform and the first and second L-shape rails, and the sealing member having an aperture to receive an igniter, the method comprising manufacturing at least the combustion chamber wall, the boss and the L-shaped rails by additive manufacturing.