(2)
 Put the access platform below the AFT cargo-compartment door 826.

 (3)
 Set the CARGO COMPT LIGHT switch 8LU to the ON position.

 (4)
 Remove the related lining panel to get access to the oxygen storage (Ref. TASK 25-55-12-000-003).

 Subtask 35-23-51-614-050
 E. Depressurize the Emergency Oxygen System
 (1)
 Close the manual shut-off valves of the emergency oxygen cylinders.

 (2)
 Put the TEST TOOL - MANUAL RELEASE on the oxygen test port 7504WR1 to release the pressure from the system.

 4. Procedure
_________
 WARNING : KEEP ALL HYDROCARBONS (FUELS, LUBRICANTS, ETC.) AWAY FROM ALL

_______
 SOURCE OF OXYGEN. OXYGEN BECOMES EXPLOSIVE WHEN IT TOUCHES
 HYDROCARBONS.

 WARNING : CLEAN THE TOOLS AND MAKE SURE YOUR HANDS ARE CLEAN TO PREVENT
_______
 CONTAMINATION OF THE OXYGEN SYSTEM.

 CAUTION : PUT DRY, CLEAN, METAL OR PLASTIC PLUGS ON ALL PIPES OR UNITS

_______ REMOVED TEMPORARILY. PUT EACH PIPE OR UNIT IN A SEALED VINYL BAG.
 Subtask 35-23-51-860-050
 A. Obey the special precautions when you do this task (Ref. TASK 35-00-00-860-001).
 Subtask 35-23-51-020-050
 B. Removal of the Pressure Reducers (990WR1-990WR6)
 (Ref. Fig. 401/TASK 35-23-51-991-001)

 (1) Disconnection of the Electrical Connectors CAUTION : MAKE SURE THAT THE ELECTRICAL CONNECTOR(S) IS(ARE)
_______ DISCONNECTED BEFORE YOU DISCONNECT THE BONDING STRAP(S).
 (a)
 Disconnect the electrical connectors (3).

 (b)
 Put CAP - BLANKING on the disconnected electrical connectors.

 (c)
 Disconnect the bonding strap.

 (2)
 Disconnection of the unions

 (a)
 Loosen the nut (2) and disconnect the thermal compensator (1).

 (b)
 Loosen the nut (4) and disconnect the hoses (5).

 (3)
 Loosen the nut (6) and remove the pressure reducer (7).

 (4)
 Put PLUG - BLANKING on the disconnected line ends.

 (5)
 Put the disconnected line ends into a sealed BAG - VINYL.

 Pressure Reducer
 Figure 401/TASK 35-23-51-991-001
 EFF :  401-499,  35-23-51 Page 404 
Aug 01/05
 CES 

 TASK 35-23-51-400-001
 Installation of the Pressure Reducer (990WR1-990WR6)
 1. Reason for the Job
__________________
 Self Explanatory
 2. Job Set-up Information
______________________
 A. Fixtures, Tools, Test and Support Equipment
 -------------------------------------------------------------------------------REFERENCE QTY DESIGNATION
 -------------------------------------------------------------------------------
No specific access platform 1.6 m (5 ft. 3 in.)
 No specific Torque Wrench : range 0.20 to 3.60 m.daN

 (2.00 to 26.00 lbf.ft) No specific Torque Wrench : range 1.00 to 10.00 m.daN
 (8.00 to 75.00 lbf.ft)
 B. Consumable Materials
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
Material No. 07-001D  D 75-T-2-5721-3-1 ELECTRICAL BONDING COATING (BLUE COLOR) (Ref. 20-31-00)
 Material No. 09-016B  USA MIL-PRF-81733D TYPE II CORROSION INHIBITING FILLET CONSISTENCY (Ref. 20-31-00)

 C. 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
 25-55-12-000-003  Removal of the Sidewall Panels in the AFT Cargo Compartment - FR59/FR65
 25-55-12-400-003  Installation of the Sidewall Panels in the AFT Cargo Compartment - FR59/FR65
 35-00-00-860-001  Special precautions when working on a Gaseous Oxygen System
 35-21-00-614-001
 35-23-00-790-001  Leak Check of Components in the Intermediate Line of the Oxygen System
 52-30-00-860-001  Open the FWD or AFT Cargo-Compartment Door with the Yellow Electric Pump
 52-30-00-860-002  Close the FWD or AFT Cargo-Compartment Door with the Yellow Electric Pump
 35-23-51-991-001  Fig. 401
　
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