1)  If you find axial cracks that come together, replace the outer exhaust duct (Ref 49-81-01/401).
 S 416-003
 (3) Install the outer exhaust duct for the APU (Ref 49-81-01/401).
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MAINTENANCE MANUAL

APU Turbine Exhaust Duct Nozzle Inspection
Figure 601

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747-400 MAINTENANCE MANUAL
 INNER EXHAUST DUCT - REMOVAL/INSTALLATION
_________________________________________
 1.  General_______
 A.  This procedure contains the tasks for the removal and the installation of the inner exhaust duct.
 B.  The duct assembly is referred to as the inner exhaust duct.
 C.  The inner exhaust duct is in the outer exhaust duct. The inner exhaust duct can be removed with the outer exhaust duct in the airplane. You can get access to the inner exhaust duct through the APU access doors and at the exhaust duct outlet.
 TASK 49-81-02-004-001
 2.  Inner Exhaust Duct Removal (Fig. 401)__________________________
 A.  References
 (1)  
IPC 49-81-51 Fig. 1

 B.  
Access

 (1)  
Location Zone
 317 APU Compartment-Exhaust Duct, LH
 318 APU Compartment-Exhaust Duct, RH

 (2)  
Access Panel
 317AL APU Access Door
 318AR APU Access Door

 C.  
Procedure

 S 864-002
 (1)  
Make sure the APU control switch on the P5 panel is OFF and attach a DO-NOT-OPERATE tag.

 S 864-003

 (2)  
Open these circuit breakers and attach DO-NOT-CLOSE tags:

 (a)  
P6 Main Power Supply Panel
 1) 6K18 APU ALTN CONT

 (b)  
P83 Panel, E8 Aft Equipment Center
 1) APU PRIMARY CONT

 S 014-004
 (3)  
Open the APU access doors:

 (a)  
Open the latches on the APU access doors.

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SEE  A  LEAF SPRING SEAL (REF)  SEE  C 
SEE  B 
1. OUTER DUCT EXHAUST 
BOLT5.  A  3. 2. INNER ACOUSTIC EXHAUST LINER DUCT 
BUSHING6. 
WASHER9.  WASHER7.  DUCT EXHAUST INNER3.  NUT4. 
NUT8.  LINING ACOUSTIC2. 
B  C 
Figure 401 APU Inner Exhaust Duct Installation 

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747-400 MAINTENANCE MANUAL
 (b)  
Open the APU access doors.

 (c)  
Engage the support rods for the APU access doors.

 S 024-005
 CAUTION:_______DO NOT OPERATE THE APU WITH THE ACOUSTIC LINING REMOVED. THE OPERATION WITHOUT AN ACOUSTIC LINING WILL NOT LET THE HEAT DECREASE SUFFICIENTLY. THIS CAN CAUSE DAMAGE TO THE AIRPLANE STRUCTURE.
 (4)  
Remove the inner exhaust duct (3):

 (a)  
Remove the nuts, the washers, and the bolts that attach the acoustic lining (2) to the inner exhaust duct (3).
　
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