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R  **ON A/C 301-399, 
R  Subtask 21-43-52-860-050-A 
R  A. Aircraft Maintenance Configuration 
R  (1) Make sure that: 
R  (a) The access platform is in position at the access panel 197KB. 
R  (b) The access panel 197BB is removed (Ref. TASK 53-35-13-000-002). 
R  (c) On the panel 30VU: 
R R  1_  The APU BLEED pushbutton switch is in the off position (the ONlegend is off). 
R R  2_  The ENG 1 BLEED and the ENG 2 BLEED pushbutton switches are inthe off position (the OFF legends are on). 
R R  3_  The warning notice to tell persons not to operate theseswitches is in position. 
R R  (d) On the HP ground connector the warning notice to tell persons not to supply the ground air is in position.

 

 **ON A/C ALL
 Subtask 21-43-52-865-051
 B. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged
 -------------------------------------------------------------------------------
PANEL DESIGNATION IDENT. LOCATION
 -------------------------------------------------------------------------------

R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 301-399,
 122VU AIR COND/AFT CARGO VENT/FAN 30HN S22 R **ON A/C ALL
 Subtask 21-43-52-865-056
 C. Open, safety and tag this(these) circuit breaker(s):
 -------------------------------------------------------------------------------
PANEL DESIGNATION FIN LOCATION
 -------------------------------------------------------------------------------
122VU AIR COND/AFT CARGO VENT/CTL AND/MONG 31HN 20 S
 or alternative location :-
49VU AIR COND/AFT CARGO/VENT/CTL & MONG 31HN 07 C
 4. Procedure
_________ R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499,
 (Ref. Fig. 401/TASK 21-43-52-991-001)
 **ON A/C 301-399,

 (Ref. Fig. 401A/TASK 21-43-52-991-001-A)R **ON A/C ALL

 

 Subtask 21-43-52-420-050
 A. Installation of the Pressure Regulating Valve
 (1)
 Unlock and turn the manual override and position indicator (14) to the open position.

 (2)
 Remove the protective covers from the pressure regulating valve (30), the pipe assembly (27) and the ducts (24) and (32).

 (3)
 Clean the component interface and/or the adjacent area.

 (4)
 Make sure that the parts retained from the removed component are clean and in the correct condition.

 (5)
 Make sure that the O-rings (25) are in a good condition. If necessary replace the O-rings (25).

 (6)
 Put the O-ring (25) in position on the pipe assembly (27).

 (7)
 Put the pressure regulating valve (30) in position on the pipe assembly (27) and install the clamp (28).

 NOTE : Make sure that the arrow on the body of the pressure
____ regulating valve points in the direction of the air flow. Do not fully tighten the clamp (28) at this time.
 (8)
 Put the O-rings (25) in position on the flange of the duct (32) and on the pressure regulating valve (30).

 (9)
 Put the pressure regulating valve (30) and the pipe assembly (27) in position on the ducts (24) and (32) and install the clamps (26) and (33).

 NOTE : Do not fully tighten the clamps (26) and (33) at this time.
____
 (10)
 Make sure that the pipe assembly (27) is in the correct position.

 (11)
 Put the tie-rods (20) and (21) in position and install the bolts (11), the washers (24) and the nuts (23).

 (12)
 Make sure that the pressure regulating valve (30) is in the correct position.

 

 NOTE : When you look in the forward direction the manual override and
____ position indicator (14) must be in the 5 o'clock position.
 (13)
 Remove the blanking plugs from the disconnected line ends and connect the sense line (29).

 (14)
 TORQUE the clamps (26), (28) and (32) to between 0.51 and 0.56 m.daN

 (45.13 and 49.55 lbf.in).

 (15)
 Put the bonding strap (7) in position on the pressure regulating valve (30) and install the screw (6), the washer (8) and the nut (9). (Ref. TASK 20-28-00-912-004).

 (16)
 Put the bonding straps (7) and (12) in position and install the screw (13), the washer (11) and the nut (10) (Ref. TASK 20-28-00-912-004).

 (17)
 Remove the blanking caps from the electrical connectors.

 (18)
 Make sure that the electrical connectors are clean and in the correct condition.
　
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