公开(公告)号：US20180362177A1

公开(公告)日：2018-12-20

申请号：US15627412

申请日：2017-06-19

Applicant: Bell Helicopter Textron Inc.

Inventor： Brent Scannell ,  Thomas Mast

IPC: B64D33/02 ,  B64C27/12 ,  B64C1/10 ,  B64C29/00

CPC classification number: B64D33/02 ,  B64C1/10 ,  B64C27/12 ,  B64C29/0033 ,  B64D2045/009

Abstract: In one embodiment, there is described an inlet plenum assembly for a rotary aircraft, including: an inlet plenum defined on a first side by an inlet plenum wall and on a second side by a forward firewall assembly; the inlet plenum wall having a mechanical interface for receiving a reduction gearbox (RGB) to provide reduction gearing to the drive shaft; and the forward firewall assembly having an inlet aperture configured to receive a drive shaft to rotatably couple to an engine; wherein the forward firewall assembly includes a forward firewall upper and a forward firewall lower, the forward firewall upper configured to removably seat to the forward firewall lower.