Auxiliary power unit exhaust duct with muffler incorporating an externally replaceable acoustic liner
AssigneeHoneywell International Inc.
InventorNicholas A. Williams
Life of this patent
Estimating the term…
Abstract
Methods and apparatus are provided for an exhaust duct having an externally replaceable acoustic liner. The exhaust duct includes a forward section that is configured to be axially coupled with a bulkhead collar on the aircraft, a body section that is coupled to the forward section and a stinger cap that includes the replaceable acoustic liner. The replaceable acoustic liner is configured to be slideably received by the body section.
Claims22
An exhaust duct for use in an aircraft, comprising:
- a forward section configured to be axially coupled with the aircraft;
- a body section coupled to the forward section;
- and
- a stinger cap with an acoustic liner, the acoustic liner configured to be slideably received by the body section, and replaceable from outside the aircraft.
An auxiliary power unit exhaust duct for use in an aircraft, comprising:
- a forward section configured to be axially coupled with the aircraft, the forward section having a flow entrainment bellmouth;
- a body section coupled to the forward section, the body section having an outer skin and a plurality of baffles;
- and
- a stinger cap with a replaceable acoustic liner, the replaceable acoustic liner being configured to be slideably received by the plurality of baffles of the body section and be slideably coupled to the bellmouth.
A method of externally replacing an acoustic liner of an exhaust duct mounted in an aircraft, comprising:
- sliding a stinger cap with the acoustic liner out of the exhaust duct;
- uncoupling the acoustic liner from the stinger cap;
- coupling a new acoustic liner to the stinger cap;
- and
- inserting the stinger cap with the new acoustic liner into the exhaust duct.
Dependencies are inferred from the claim text.