R 1EFF : 301-399, 1 21-43-52Page 407 1 1 May 01/04 1 1 1CES 1 **ON A/C ALL

 Subtask 21-43-52-020-051
 A. Removal of the Pressure Regulating Valve
 (1)
 Disconnect the electrical connector (31).

 (2)
 Put blanking caps on the disconnected electrical connectors.

 (3)
 Disconnect the sense line (29).

 (4)
 Put blanking plugs on the disconnected line ends.

 (5)
 Remove the nut (10), the washer (11), the screw (13) and disconnect the bonding straps (7) and (12).

 (6)
 Remove the nuts (4), the washers (3), the bolts (2) and disconnect the tie-rods (1) and (5).

 (7)
 Remove the nut (9), the washer (8), the screw (6) and remove and retain the bonding strap (7).

 (8)
 Hold the pressure regulating valve (30) together with the pipe assembly (27) and remove the clamps (26) and (33).

 (9)
 Remove the regulating valve (30) and the pipe assembly (27) from the aircraft.

 (10)
 Remove the O-rings (25).

 (11)
 Remove the clamp (28) and move apart the pressure regulating valve

 (30) and the pipe assembly (27).

 (12)
 Remove the O-ring (15).

 (13)
 Put protective covers on the open ends of the ducts (24) and (32), the pipe assembly (27) and the regulating valve (30).

 (14)
 On the pressure regulating valve (30) move and lock the manual override and position indicator (14) in the closed position.

 1EFF : ALL 1 21-43-52Page 408 1 1 Aug 01/05R 1 1 1CES 1

 TASK 21-43-52-400-001 Installation of the Pressure Regulating Valve - Aft Cargo-Compartment Heating WARNING : MAKE SURE THAT AIR IS NOT SUPPLIED TO THE AIR CONDITIONING SYSTEM
_______
 FROM THE MAIN ENGINE, THE APU OR A GROUND SOURCE.
 HOT COMPRESSED AIR CAN CAUSE INJURY TO PERSONNEL.

 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 m (6 ft. 7 in.) R No specific Torque Wrench : range 0.00 to 1.20 m.daN R (0.00 to 9.00 lbf.ft)
 B. Expendable Parts
 -------------------------------------------------------------------------------
FIG.ITEM |DESIGNATION |IPC-CSN
 -------------------------------------------------------------------------------
25 O-rings 21-43-04 14B-070 C. Referenced Information

 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
12-33-21-618-001 Pre-conditioning through the HP Ground Connection 12-33-21-618-001 Pre-conditioning with the APU 20-28-00-912-004 Electrical Bonding of Components With Conductive
 Bolts and Screws and Bonding Straps in the Fuselage and in the Wings (this does not include the tanks)-21-43-00-710-003 Operational Test of the AFT Cargo Compartment Heating System 24-41-00-862-002 De-energize the Aircraft Electrical Circuits Supplied from the External Power 53-35-13-000-002 Removal of the Quick-Release Access Panels from the Belly Fairing Structure 53-35-13-400-002 Installation of the Quick-Release Access Panels on the Belly Fairing Structure

R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499,
 21-43-52-991-001 Fig. 401
 **ON A/C 301-399,
 21-43-52-991-001-A Fig. 401A
 **ON A/C ALL
 3. Job Set-up
__________

R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499,
 Subtask 21-43-52-860-050
 A. Aircraft Maintenance Configuration
 (1) Make sure that:
 (a)
 The access platform is in position at the access panel 197BB.

 (b)
 The access panel 197BB is removed (Ref. TASK 53-35-13-000-002).

 (c) On the panel 30VU:
 1_ The APU BLEED pushbutton switch is in the off position (the ON legend is off).
 2_ The ENG 1 BLEED and the ENG 2 BLEED pushbutton switches are in the off position (the OFF legends are on).
 3_ The warning notice to tell persons not to operate these switches is in position.
 (d) On the HP ground connector the warning notice to tell persons not to supply the ground air is in position. 
　
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