Abstract: Aspects of the disclosure regard a fan case assembly for a gas turbine engine, the fan case assembly comprising a fan case having an inner surface and an outer surface, a front acoustic panel having an outer surface, and attachment means attaching the front acoustic panel outer surface to the fan case inner surface. The attachment means comprise a sliding arrangement allowing the front acoustic panel to be slid axially into the fan case. The sliding arrangement comprises a first longitudinal member and a second longitudinal member, one of the members being attached to the fan case inner surface and the other member being attached to the front acoustic panel outer surface. The attachment means further comprise removable fastening means fixing the first longitudinal member and the second longitudinal member in the axial direction.

Abstract: According to one aspect, a flange fastening assembly for a gas turbine engine includes a first flange having a first hole therein, a second flange having a second hole disposed adjacent to the first flange, and a shoulder bolt disposed through the first hole and the second hole. The shoulder bolt has a head portion, a stem portion, and a thread portion, and the stem portion and the thread portion define a shoulder. A bolt nut is disposed on the thread portion and a first spacer is disposed between the bolt nut and the first flange such that the first spacer overhangs the shoulder.

Abstract: According to one aspect, a flange fastening assembly for a gas turbine engine includes a first flange having a first hole therein, a second flange having a second hole disposed adjacent to the first flange, and a shoulder bolt disposed through the first hole and the second hole. The shoulder bolt has a head portion, a stem portion, and a thread portion, and the stem portion and the thread portion define a shoulder. A bolt nut is disposed on the thread portion and a first spacer is disposed between the bolt nut and the first flange such that the first spacer overhangs the shoulder.