(b)
 The Fwd cargo-compartment door 825 is open (Ref. TASK 52-30-00-860-001).

 (c)
 The access platform is in position at the Fwd cargo-compartment door 825.

 (d)
 The access panels 131NW and 131PW are removed (Ref. TASK 25-54-12-000-001).

 Subtask 21-63-52-865-051
 B. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged
 -------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------
R  **ON A/C 401-499,
 49VU AIR COND/TEMP CTL/SYS 1 CHAN B/28VDC  52HH  D08 
R  **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 301-399,
 122VU AIR COND/ZONE TEMP CTL/28VDC/SYS2 122VU AIR COND/ZONE TEMP CTL/28VDC/SYS1 122VU AIR COND/ZONE TEMP CTL/115VAC/SYS2 122VU AIR COND/ZONE TEMP CTL/115VAC/SYS1  4HK 3HK 2HK 1HK  V20V19V18V17 
R  **ON A/C 401-499,
R R  122VU AIR COND/TEMP CTL SYS 2/CHAN A/115VAC 122VU AIR COND/TEMP CTL SYS 2/CHAN A/28VDC 122VU AIR COND/TEMP CTL SYS 1/CHAN A/115VAC 122VU AIR COND/TEMP CTL SYS 1/CHAN A/28VDC 122VU AIR COND/TEMP CTL SYS 2/CHAN B/28VDC 122VU AIR COND/TEMP CTL SYS 2/CHAN B/115VAC 122VU AIR COND/TEMP CTL SYS 1/CHAN B/115VAC  53HH 55HH 49HH 51HH 56HH 54HH 50HH  W22W21X22X21 Y21Y20Y18 

R **ON A/C ALL
 4. Procedure
_________
 (Ref. Fig. 401/TASK 21-63-52-991-001)
 Subtask 21-63-52-420-050
 A. Installation of the Pressure Regulating Valve
 (1)
 Remove the blanking plugs from the duct flanges (24) and (29), the duct assembly (27), and the pressure regulating valve (30).

 (2)
 Clean the component interface and/or the adjacent area.

 (3)
 Make sure that the parts retained from the removed component are clean and in the correct condition.

 (4)
 Make sure that the O-rings (25) are in a good condition. If necessary replace the O-rings (25).

 (5)
 Put the O-ring (25) and the pressure regulating valve (30) in position on the duct flange (24).

 (6)
 Install the clamp (31). NOTE : Do not fully tighten the clamp (31) at this time.

____
 Make sure that:

 -the pressure regulating valve (6) faces in the correct direction.
 -when you look in a rearwards direction the manual closure lever is in the 3 o'clock position.
 (7)
 Put the O-ring (25) in position on the pressure regulating valve (30).

 (8)
 Put the duct assembly (27) in position on the duct flange (29) and the pressure regulating valve (30).

 (9)
 Install the clamps (26) and (28). NOTE : Do not fully tighten the clamps (26) and (28) at this time.

____
 (10)
 Make sure that the pressure regulating valve (30) is in the correct position and install the sense lines (4) and (5).

 (11)
 TORQUE the clamps (31) and (26) to between 0.491 and 0.546 m.daN

 (43.45 and 48.31 lbf.in).

 (12)
 TORQUE the clamp (28) to between 0.4 and 0.5 m.daN (35.39 and 44.24 lbf.in).

 (13)
 Put the bonding strap (8) in position and install the washer (7), the screw (6), the washer (9) and the nut (10) (Ref. TASK 20-28-00-912-004).

 (14)
 Remove the blanking caps from the disconnected electrical connections.

 (15)
 Make sure that the electrical connectors are clean and in the correct condition.

 (16)
 Connect the electrical connectors (1), (2) and (3).

 (17)
 Make sure that the work area is clean and clear of tool(s) and other items.

R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 301-399,
 Subtask 21-63-52-865-053
 B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s): 1HK, 2HK, 3HK, 4HK.

R **ON A/C 401-499,
 Subtask 21-63-52-865-053-A
 B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s): 49HH, 50HH, 51HH, 52HH, 53HH, 54HH, 55HH, 56HH.

R **ON A/C ALL
 Subtask 21-63-52-710-050
 C. Test
 (1)
 Do the pre-conditioning through the HP ground connector or with the APU (Ref. TASK 12-33-21-618-001) (Ref. TASK 12-33-21-618-001).

 (2)
 Do a leak check of the pressure regulating valve and sense line connections.

 NOTE : Leaks are not permitted.
　
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