Abstract: A compartment based inlet particle separator system for an aircraft that includes an auxiliary power unit (APU) system compartment is provided. The system includes a separation barrier wall, a ram air inlet opening, a diffuser, and an inlet particle separator (IPS). The separation barrier wall is disposed within the APU system compartment and divides the APU system compartment into two compartments. The ram air inlet opening is formed one of the compartments. The diffuser receives ram air from a ram air inlet opening and discharges ram air into a compartment. The IPS is disposed within the a compartment between the diffuser outlet and the APU air inlet port.

Abstract: A single drain mast seal that provides a fluidly segregated internal chamber for air inlet drain lines is provided. The provided drain mast seal does not significantly add to the seal's compressive load and minimizes the seal's three-dimensional space claim. In addition, the provided drain mast seal is formed to sufficiently support associated drain lines without requiring external clamps or hardware components. The provided drain mast seal thereby optimizes the APU-to-drain mast interface.

Abstract: A compartment based inlet particle separator system for an aircraft that includes an auxiliary power unit (APU) system compartment is provided. The system includes a separation barrier wall, a ram air inlet opening, a diffuser, and an inlet particle separator (IPS). The separation barrier wall is disposed within the APU system compartment and divides the APU system compartment into two compartments. The ram air inlet opening is formed one of the compartments. The diffuser receives ram air from a ram air inlet opening and discharges ram air into a compartment. The IPS is disposed within the a compartment between the diffuser outlet and the APU air inlet port.

Abstract: A single drain mast seal that provides a fluidly segregated internal chamber for air inlet drain lines is provided. The provided drain mast seal does not significantly add to the seal's compressive load and minimizes the seal's three-dimensional space claim. In addition, the provided drain mast seal is formed to sufficiently support associated drain lines without requiring external clamps or hardware components. The provided drain mast seal thereby optimizes the APU-to-drain mast interface.

Abstract: An insulation assembly for use with an APU having an exhaust muffler is disclosed herein. The insulation assembly includes, but is not limited to, a first insulating member that is configured for placement on a top portion of the exhaust muffler and a second insulating member attached to the first insulating member and configured for placement on a bottom portion of the exhaust muffler. The second insulating member is less resistant to heat transfer than the first insulating member.

Abstract: An adjustable and lockable bushing assembly includes a locking plate and a bushing. The locking plate has a bushing engagement opening that is defined by a plurality of first serrations, and a boss that extends axially therefrom. The bushing engages the locking plate and includes a concentric section, an eccentric section, a lock interface section, and an opening. The opening has a fixed diameter and extends along a longitudinal axis through the bushing. The concentric section has an outer surface that has a circumference that is concentric with the longitudinal axis. The eccentric section extends from the concentric section has an outer surface that has a circumference that is eccentric with the longitudinal axis. The lock interface section extends from the concentric section and includes an outer surface defined by a plurality of second serrations that engage the first serrations.

Abstract: An insulation assembly for use with an APU having an exhaust muffler is disclosed herein. The insulation assembly includes, but is not limited to, a first insulating member that is configured for placement on a top portion of the exhaust muffler and a second insulating member attached to the first insulating member and configured for placement on a bottom portion of the exhaust muffler. The second insulating member is less resistant to heat transfer than the first insulating member.