Patent ID: 7526921

Claim:
An auxiliary power unit and integral firebox, comprising: a turbomachine; a fireproof air intake duct at least partially surrounding the turbomachine, a turbomachine air intake duct having an aft end; a fireproof enclosure having an intake portion and surrounding the turbomachine; a fireproof mounting portion adapted to coupling the aft end of the turbomachine air intake duct to the intake portion of the fireproof enclosure, the coupling comprising a fireproof sealant disposed between the fireproof mounting portion and the air intake duct, the fireproof mounting portion further adapted to couple the air intake duct and the fireproof enclosure to the turbomachine, wherein the coupling between the air intake duct and the fireproof enclosure comprises a plurality of fireproof joint; and a bleed port having an inlet end connected to a turbomachine bleed air supply, said bleed port extending from said inlet end through said fireproof enclosure to an outlet, wherein said bleed port further comprises a stub duct extending radially from a turbomachine bleed air takeoff duct to penetrate a bleed port aperture of said fireproof enclosure, said bleed port having a fireproof compressible seal disposed to said stub duct inboard of said fireproof enclosure.