Auxiliary power unit

FIG. 1 is a top front left perspective view of a design for an auxiliary power unit according to the present invention.

FIG. 2 is a bottom front right perspective view of the auxiliary power unit of FIG. 1 .

FIG. 3 is a front view of the auxiliary power unit of FIG. 1 .

FIG. 4 is a back view of the auxiliary power unit of FIG. 1 .

FIG. 5 is a right side view of the auxiliary power unit of FIG. 1 .

FIG. 6 is a left side view of the auxiliary power unit of FIG. 1 .

FIG. 7 is a top view of the auxiliary power unit of FIG. 1 ; and,

FIG. 8 is a bottom view of the auxiliary power unit of FIG. 1 .

The broken line showing of an auxiliary power unit is for the purpose of illustrating portions of the article and forms no part of the claimed design.