DUCT - AIR BYPASS - REMOVAL/INSTALLATION
________________________________________ TASK 49-51-42-000-003 Air By-Pass Duct - Removal (APS 3200) WARNING : DO NOT TOUCH THE APU UNTIL IT IS SUFFICIENTLY COOL TO PREVENT BURNS
_______ WHEN YOU DO THE MAINTENANCE TASK(S).
 1.
 Reason for the Job

__________________
 Self Explanatory

 2.
 Job Set-up Information

______________________
 A. Fixtures, Tools, Test and Support Equipment
 -------------------------------------------------------------------------------REFERENCE QTY DESIGNATION -------------------------------------------------------------------------------
No specific circuit breaker(s) safety clip(s) No specific access platform 2.5 m (8 ft. 2 in.)
 B. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
24-41-00-861-002 Energize the Aircraft Electrical Circuits from the External Power 29-00-00-864-001 Put the Related Hydraulic System in the Depressurized
 Configuration before Maintenance Action 52-41-00-010-001 Open the APU Doors for Access 49-51-42-991-003 Fig. 401

 3. Job Set-up
__________ Subtask 49-51-42-860-050
 A. Aircraft Maintenance Configuration
 (1)
 Energize the aircraft electrical circuits
 (Ref. TASK 24-41-00-861-002).

 (2)
 On the panel 25VU, make sure that the APU MASTER SW pushbutton switch is off.

 (3)
 Put a warning notice in the cockpit to tell persons not to start the APU.

 (4)
 Make sure that hydraulic systems are depressurized
 (Ref. TASK 29-00-00-864-001).

 Subtask 49-51-42-865-058
 B. Open, safety and tag this(these) circuit breaker(s):
 -------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------121VU APU/APU/CTL 2KD L42 121VU APU/ECB/SPLY 1KD L41
 Subtask 49-51-42-010-058
 C. Get Access
 (1)
 Put the access platformin position below the APU access doors 315AL and 316AR.

 (2)
 Open the access doors 315AL, 316AR (Ref. TASK 52-41-00-010-001).

 (3)
 Set the LIGHT control switch 11LJ to the on position.

 4. Procedure
_________
 (Ref. Fig. 401/TASK 49-51-42-991-003) Subtask 49-51-42-020-051
 A. Remove the Air By-Pass Duct
 (1)
 Remove the bolt (5) from the tube clamp (6).

 (2)
 Remove the V-band clamp (8) and the band clamp (1).

 (3)
 Remove the air by-pass duct (4) between the exhaust duct and the bleed control valve.

 (4)
 Remove and discard the packing (7) from the air by-pass duct.

 (5)
 Install protective covers on the exhaust duct and the bleed control valve.

 Air By-Pass Duct
 Figure 401/TASK 49-51-42-991-003

 CES

 TASK 49-51-42-400-003
 Air By-Pass Duct - Installation (APS 3200)

 1. Reason for the Job
__________________
 Self Explanatory
 2. Job Set-up Information
______________________
 A. Fixtures, Tools, Test and Support Equipment
 -------------------------------------------------------------------------------REFERENCE QTY DESIGNATION -------------------------------------------------------------------------------
No specific  Torque Wrench : range 5.00 to 35.00 lbf.in
 (0.05
 to 0.40 m.daN) No specific Torque Wrench : range 36.00 to 220.00 lbf.in

 (0.40 to 2.60 m.daN)

 B.
 Consumable Materials

 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
Material No. 04-012  USA VV-P-236 PURE MINERALVASELINE OR PETRO- LATUM (Ref. 20-31-00)
 C. Expendable Parts
 -------------------------------------------------------------------------------FIG.ITEM |DESIGNATION |IPC-CSN -------------------------------------------------------------------------------
sleeve  49-51-04 50A-200

 D. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
24-41-00-861-002 Energize the Aircraft Electrical Circuits from the External Power 24-41-00-862-002 De-energize the Aircraft Electrical Circuits Supplied from the External Power 29-00-00-864-001 Put the Related Hydraulic System in the Depressurized
　
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