A turbine engine comprising: a first member having a first aperture ; a second member adjacent to the first member and having a second aperture extending between opposed first and second faces of the second member and aligned with the first aperture to define a combined aperture having a longitudinal extent , the second aperture being defined by a surface having a portion , the portion having an extent transverse to the longitudinal extent ; and at least a portion of a fastener disposed in the combined aperture , the fastener having a first end proximal the first member and a second end proximal the second member , the fastener including a first retaining member in contact with the first member , a second retaining member in interfering relationship with the portion of the surface defining the second aperture and a third retaining member in contact with the second face of the second member ; wherein the fastener includes a bolt , the bolt having a remaining portion extending between the second retaining member and the second end , the second retaining member being wider than the remaining portion ; wherein the fastener further includes a frangible portion disposed between the first retaining member and the second retaining member , the frangible portion being a narrower portion, the narrower portion being narrower than the first retaining member , the second retaining member , and the remaining portion of the bolt , the narrower portion being formed by a narrowing of the material of the bolt ; and wherein the fastener is adapted to break at the frangible portion , and the second retaining member remains in interfering relationship with the portion of the surface defining the second aperture after the fastener is broken at the frangible portion ; characterized in that the second member is a casing surrounding a fan and the first member is a panel secured to the casing by the fastener . a first member having a first aperture ; a second member adjacent to the first member and having a second aperture extending between opposed first and second faces of the second member and aligned with the first aperture to define a combined aperture having a longitudinal extent , the second aperture being defined by a surface having a portion , the portion having an extent transverse to the longitudinal extent ; and at least a portion of a fastener disposed in the combined aperture , the fastener having a first end proximal the first member and a second end proximal the second member , the fastener including a first retaining member in contact with the first member , a second retaining member in interfering relationship with the portion of the surface defining the second aperture and a third retaining member in contact with the second face of the second member ; wherein the fastener includes a bolt , the bolt having a remaining portion extending between the second retaining member and the second end , the second retaining member being wider than the remaining portion ; wherein the fastener further includes a frangible portion disposed between the first retaining member and the second retaining member , the frangible portion being a narrower portion, the narrower portion being narrower than the first retaining member , the second retaining member , and the remaining portion of the bolt , the narrower portion being formed by a narrowing of the material of the bolt ; and wherein the fastener is adapted to break at the frangible portion , and the second retaining member remains in interfering relationship with the portion of the surface defining the second aperture after the fastener is broken at the frangible portion ; characterized in that the second member is a casing surrounding a fan and the first member is a panel secured to the casing by the fastener . <EOS>