Gas turbine engine bypass drainage systems

A core housing for a gas turbine engine, the core housing comprising:

• a housing surface defining an exterior surface of the core housing;
• a housing aperture arranged on the housing surface, the housing aperture configured to enable fluid communication between an external environment and an interior of the core housing;
• a drainage hole arranged upstream relative to the housing aperture, the drainage hole configured to enable draining of a fluid from the interior of the core housing to the external environment;
• and
• a redirection device arranged to receive the fluid from the drainage hole and direct said fluid away from the housing aperture,
• wherein the redirection device has a channel body defining a channel extending between a channel inlet and a channel outlet,
• wherein the channel body comprises a first section and a second section, wherein the first section includes the channel inlet and the second section includes the channel outlet, and
• wherein the first section extends in a first axial direction and the second section extends in a second axial direction, wherein the first axial direction is different from the second axial direction.