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 (84, 88) 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 (84, 88), 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 (84, 88) 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 (84, 88), 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.