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Acoustic Liner (Fig 1.)
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 A.  The acoustic liner is formed of two cylinders of semiporous stainless steel acoustical material. The two cylinders are separated radially by circumferential baffles and are joined at one end to form a single unit. The liner is fastened to the aft end of the inner exhaust duct and is supported at both ends by radial baffles extending in from the inner exhaust duct. The forward end of the liner is not fastened to the inner exhaust duct to allow for thermal expansion of the liner. The liner is quickly removable for inspection and cleaning, from outside the airplane.
Operation (Fig. 2)
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A

747-400
MAINTENANCE MANUAL

LEAF SPRING SEAL
ACOUSTIC LINER
BELLOWS AND
FWD
DRAIN
HOSE

 

A

APU Exhaust System Component Location
Figure 1

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747-400
MAINTENANCE MANUAL

COOLING AIR AND APU

EXHAUST GAS MIXED
APU Exhaust System Cross Section and Flow Diagram
Figure 2

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747-400
MAINTENANCE MANUAL

 A.  When the APU is operating, exhaust gases flow overboard through the exhaust duct. The exhaust duct is cooled by ejector action. The exhaust gas flow in the nozzle develops negative pressure at the gap between the forward end of the inner exhaust duct and the outside surface of the nozzle. This draws ambient cooling air through the opening between inner exhaust duct and the tail cone skin. The cooling air passes between the inside surface of the outer exhaust duct and the outside surface of the inner exhaust duct into the gap where it mixes with APU exhaust gases and is exhausted overboard.
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747-400 FAULT ISOLATION/MAINT MANUAL
APU EXHAUST SYSTEM

APU Exhaust System - Component Index
Figure 101

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E64685
A
747-400 FAULT ISOLATION/MAINT MANUAL

OUTER EXHAUST

FWD

APU Exhaust System - Component Location Figure 102
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747-400 MAINTENANCE MANUAL
 OUTER EXHAUST DUCT - REMOVAL/INSTALLATION
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 1.  General_______
 A.  This procedure contains the tasks for the removal and the installation of the outer exhaust duct.
　
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