A gas turbine engine mountable with engine mounting pads, the gas turbine engine comprising: a structure linked to the engine mounting pads and having attachment flanges distributed circumferentially about a center axis of the gas turbine engine, each attachment flange having an attachment flange opening; a bearing housing mounted to the structure and including a bearing supporting a rotatable shaft of the gas turbine engine, the bearing housing having bearing housing flanges distributed circumferentially about the center axis of the gas turbine engine, each bearing housing flange having a bearing housing flange opening aligned with the attachment flange opening of an attachment flange of the attachment flanges, some of the bearing housing flange openings being slots extending circumferentially about the center axis of the gas turbine engine; and fasteners, such as bolts, including a first group of the fasteners and a second group of the fasteners different from the first group of the fasteners, each fastener of the first group of the fasteners extending through one of the attachment flange openings and through one of the bearing housing flange openings aligned with that attachment flange opening, each fastener of the second group of the fasteners extending through one of the attachment flange openings and through one of the slots aligned with that attachment flange opening, the first group of the fasteners being sacrificial fasteners defining a fracture load indicative of a resistance of the sacrificial fasteners to fracture, the sacrificial fasteners configured to fracture in response to a load on the bearing housing exceeding the fracture load, characterised in that: the slots being circumferentially elliptical apertures that have a circumferential dimension greater in magnitude than a radial dimension, and the bearing housing is circumferentially displaceable relative to the structure after fracture of the sacrificial fasteners via the second group of the fasteners moving within and relative to respective ones of the slots. a structure linked to the engine mounting pads and having attachment flanges distributed circumferentially about a center axis of the gas turbine engine, each attachment flange having an attachment flange opening; a bearing housing mounted to the structure and including a bearing supporting a rotatable shaft of the gas turbine engine, the bearing housing having bearing housing flanges distributed circumferentially about the center axis of the gas turbine engine, each bearing housing flange having a bearing housing flange opening aligned with the attachment flange opening of an attachment flange of the attachment flanges, some of the bearing housing flange openings being slots extending circumferentially about the center axis of the gas turbine engine; and fasteners, such as bolts, including a first group of the fasteners and a second group of the fasteners different from the first group of the fasteners, each fastener of the first group of the fasteners extending through one of the attachment flange openings and through one of the bearing housing flange openings aligned with that attachment flange opening, each fastener of the second group of the fasteners extending through one of the attachment flange openings and through one of the slots aligned with that attachment flange opening, the first group of the fasteners being sacrificial fasteners defining a fracture load indicative of a resistance of the sacrificial fasteners to fracture, the sacrificial fasteners configured to fracture in response to a load on the bearing housing exceeding the fracture load, the slots being circumferentially elliptical apertures that have a circumferential dimension greater in magnitude than a radial dimension, and the bearing housing is circumferentially displaceable relative to the structure after fracture of the sacrificial fasteners via the second group of the fasteners moving within and relative to respective ones of the slots.