B. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
24-42-00-861-001 Energize the Ground Service Network 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
 49-91-21-991-001 Fig. 401

 3. Job Set-up
__________ Subtask 49-91-21-860-054
 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).

 Subtask 49-91-21-865-050
 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 49-91-21-010-050
 C. Get Access
 (1)
 Put the access platform 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 SW 11LJ to the ON position.

 4. Procedure
_________
 (Ref. Fig. 401/TASK 49-91-21-991-001) Subtask 49-91-21-020-050
 A. Removal of the Differential Pressure Indicator (8073KM)
 (1)
 Remove and discard the lockwire from the differential pressure indicator (8073KM) (1).

 (2)
 Remove the differential pressure indicator (8073KM) (1).

 (3)
 Remove and discard the O-rings (2) and (3).

 Differential Pressure Indicator
 Figure 401/TASK 49-91-21-991-001

 CES  TASK 49-91-21-400-001

 Installation of the Differential Pressure Indicator (8073KM) (GTCP 36-300)
 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 3.5 m (11 ft. 6 in.)
 No specific Torque Wrench : range 0.20 to 3.60 m.daN

 (2.00 to 26.00 lbf.ft)
 B. Consumable Materials
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
Material No. 03-002 GB DEF-STAN 91-101
 LUBRICATING OIL TURBINE ENGINE SYNT BASE
 (Ref. 20-31-00) Material No. 19-010 USA AMS 5687
 LOCKWIRE STAINLESS STEEL ANNEALED 0.8MM DIA
 (Ref. 20-31-00)
 C. Expendable Parts
 -------------------------------------------------------------------------------FIG.ITEM |DESIGNATION |IPC-CSN -------------------------------------------------------------------------------
2 O-ring 49-91-41 01 -120 2 O-ring 49-91-41 01A-120 3 O-ring 49-91-41 01 -130 3 O-ring 49-91-41 01A-130

 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 49-00-00-860-003 APU Start by External Power (GTCP 36-300) 49-00-00-860-004 APU Shutdown by External Power (GTCP 36-300) 49-90-00-600-001 Check Oil Level and Replenish (GTCP 36-300) 52-41-00-010-001 Open the APU Doors for Access 52-41-00-410-001 Close the APU Doors after Access 49-91-21-991-001 Fig. 401
　
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