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 D. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
24-42-00-861-001 Energize the Ground Service Network from the External Power 24-42-00-862-001 De-energize the Ground Service Network Supplied from the External Power 29-00-00-864-001 Put the Related Hydraulic System in the Depressurized Configuration before Maintenance Action 29-14-00-614-002 Pressurization of the Hydraulic Reservoirs through
 the Ground Connector 49-00-00-860-008 APU Start by External Power (131-9(A)) 49-00-00-860-009 APU Shutdown by External Power (131-9(A)) 52-41-00-010-001 Open the APU Doors for Access 52-41-00-410-001 Close the APU Doors after Access 49-51-21-991-001 Fig. 401
 3. Job Set-up
__________
 Subtask 49-51-21-860-051
 A. Aircraft Maintenance Configuration
 (1)
 Energize the ground service network
 (Ref. TASK 24-42-00-861-001).

 (2)
 On the panel 25VU, make sure that the APU MASTER SW p/bsw is OFF.

 (3)
 Make sure that there is 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).

 (5)
 Make sure that the access platform is in position below the APU compartment.

 (6)
 Make sure that the APU access doors are open (Ref. TASK 52-41-00-010-001).

 (7)
 Make sure that the LIGHT control SW 11LJ is set to the ON position.

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 CES  Subtask 49-51-21-865-051

 B. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged
 -------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------121VU APU/APU/CTL 2KD L42 121VU APU/ECB/SPLY 1KD L41
 4. Procedure
_________
 (Ref. Fig. 401/TASK 49-51-21-991-001) Subtask 49-51-21-420-050
 A. Installation of the Inlet Pressure Transducer
 (1)
 Remove the blanking plug from the APU.

 (2)
 Lubricate the new packing (2) with OILS (Material No. 03-002).

 (3)
 Install the new packing on the transducer (3).

 (4)
 Put the transducer (3) into the APU.

 (5)
 TORQUE the nut (1) to 0.45 m.daN (39.82 lbf.in)

 (6)
 Remove the blanking caps from the electrical connectors.

 (7)
 Connect the electrical connector (4) to the transducer (3). Subtask 49-51-21-710-050

 B.
 Start and operate the APU. (Ref. TASK 49-00-00-860-008)

 (1)
 Examine the air transducer assembly for air leaks.
 NOTE : No leaks are permitted.

 (2)
 Stop the APU. (Ref. TASK 49-00-00-860-009)

____

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 APU-Inlet Pressure Transducer Figure 401/TASK 49-51-21-991-001 
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 5. Close-up
________ Subtask 49-51-21-865-052
 A. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s): 1KD, 2KD
 Subtask 49-51-21-410-050
 B. Close Access
 (1)
 Make sure that the work area is clean and clear of tool(s) and other items.

 (2)
 Set the LIGHT control SW 11LJ to the OFF position.

 (3)
 Close the APU access doors 315AL, 316AR (Ref. TASK 52-41-00-410-001).

 (4)
 Remove the access platform(s). Subtask 49-51-21-860-052

 C.
 Aircraft Maintenance Configuration

 (1)
 Pressurize the reservoirs of the hydraulic systems.
 (Ref. TASK 29-14-00-614-002).

 (2)
 De-energize the ground service network
 (Ref. TASK 24-42-00-862-001).

 (3)
 Remove the warning notice(s).

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 DUCT - BLEED AIR - REMOVAL/INSTALLATION
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