Exhaust duct assembly and aircraft including the same

An aircraft comprising a gas turbine engine and an exhaust duct assembly disposed in a low-pressure turbine portion of the gas turbine engine to discharge exhaust gas to the outside,

• wherein the exhaust duct assembly comprises
• a duct comprising an inlet through which the exhaust gas is introduced, an exhaust portion through which the exhaust gas is exhausted, and a mounting bore formed therethrough;
• a duct housing in which the duct is disposed therein, and comprising a mounting hole into which the exhaust portion is inserted;
• a shaft housing disposed inside the mounting bore, inserted into the duct housing so that one end thereof faces the inlet of the duct, and having a driving axis of the low-pressure turbine portion disposed therein;
• and
• a sealing portion having a ring shape, being coupled to one end of the shaft housing, and maintaining airtightness between the driving axis and the shaft housing.