(b)
 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.

 (c)
 On the HP and the LP ground connectors the warning notice to tell persons not to supply ground air is in position.

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

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

 (f)
 The access panels 131PW, 131NW and 132PW are removed (Ref. TASK 25-54-12-000-001).

 Subtask 21-21-43-865-051
 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/FLOW/MIXER/FLAP 3HB V22 122VU AIR COND/ZONE TEMP CTL/28VDC/SYS2 4HK V20 122VU AIR COND/ZONE TEMP CTL/28VDC/SYS1 3HK V19 122VU AIR COND/ZONE TEMP CTL/115VAC/SYS2 2HK V18 122VU AIR COND/ZONE TEMP CTL/115VAC/SYS1 1HK V17

 -------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION
 -------------------------------------------------------------------------------
**ON A/C ALL
 122VU AIR COND/RECIRC FAN/R/CTL 122VU AIR COND/RECIRC FAN/R/SPLY 122VU AIR COND/RECIRC FAN/L/CTL 122VU AIR COND/RECIRC FAN/L/SPLY  11HG 3HG 2HG 1HG  W20W18X20X18 
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 
**ON A/C ALL
 4. Procedure_________
 **ON A/C 001-049, 051-099, 101-105, 151-199, 201-299, 301-302,
 (Ref. Fig. 401/TASK 21-21-43-991-001) 
R  **ON A/C 106-149, 303-399, 401-499,
 (Ref. Fig. 401A/TASK 21-21-43-991-001-A)

R **ON A/C ALL
 Subtask 21-21-43-560-050
 A. Preparation of the Replacement Component
 (1)
 From the removed mixer unit (33):

 (a)
 Remove and discard the locking wire and remove the sensors (32) and (34) and the O-rings (31)

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

 (c)
 Remove the nuts (26), the washers (25), the screws (23), the gasket (24) and the back-up flap assembly (22).

 (d)
 Put blanking plugs on the open ends of the mixer unit (33) and the back-up flap assembly (22).

 (e)
 Remove the nut (51), the washer (50), the screws (43), the washers (44), the supply duct (45) and the flange gasket (46).

 (f)
 Remove the nut (41), the washer (42), the screws (49), the washers (48), the supply duct (47) and the flange gasket (46).

 (g)
 Put blanking plugs on the open ends of the mixer unit (33).

 (2)
 Make sure that the O-rings (31), the seal (24) and the flange gaskets

 (46) are in a good condition.

 (3)
 If necessary replace:

 (a)
 the O-rings (31),

 (b)
 the seal (24) and/or

 (c)
 the flange gaskets (46).

 (4)
 On the replacement mixer unit (33):

 (a)
 Remove the blanking plugs and/or protective covers.

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

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

 (d)
 Put the O-rings (31) in position on the sensors (32) and (34).

 (e)
 Put the sensors (32) and (34) in position in the mixer unit (33).

 (f)
 TORQUE the sensors (32) and (34) to between 0.5 and 1.0 m.daN
　
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