3. Job Set-up
__________ Subtask 21-21-42-860-050
A. Aircraft Maintenance Configuration
(1)
Make sure that:
(a)
The aircraft electrical circuits are energized (Ref. TASK 24-41-00-861-002).
(b)
On the panel 30VU:
(c)
On the HP ground connector the warning notice to tell persons not to supply the ground air is in position.
(d)
The FWD cargo-compartment door 865 is open (Ref. TASK 52-30-00-860-001).
(e)
The access platform is in position at the FWD cargo-compartment door 865.
(2)
Make sure that the access panels are removed (Ref. TASK 25-54-12-000-001).
(a)
FOR 4020HM
-131PW,
(b)
FOR 4021HM
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
pushbutton switches is in position.
-132PW.
Subtask 21-21-42-865-051
B. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged
-------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------FOR 4020HM
122VU AIR COND/RECIRC FAN/L/CTL 2HG X20
122VU AIR COND/RECIRC FAN/L/SPLY 1HG X18
FOR 4021HM 122VU AIR COND/RECIRC FAN/R/CTL 11HG W20 122VU AIR COND/RECIRC FAN/R/SPLY 3HG W18
4. Procedure
_________
(Ref. Fig. 401/TASK 21-21-42-991-001) Subtask 21-21-42-420-050
A. Installation of the Recirculation Check Valve
(1)
Remove the blanking plugs from the disconnected line ends.
(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)
Put the recirculation check valve (2) in position in the flange (3).
(5)
Put the flange (3) (together with the recirculation check valve (2)) in position in the sleeve (5).
NOTE : The center line of the recirculation check-valve hinge must be
____
in a vertical position.
(6)
Install the clamp (1).
(7)
TORQUE the clamp (1) to between 0.916 and 1.120 m.daN (81.06 and
99.11 lbf.in).
(8)
Tighten the clamp (4). NOTE : The end of the sleeve (5) must be within the painted marks on
____
the flange (3).
5. Close-up
________ Subtask 21-21-42-410-050
A. Close Access
(1)
Make sure that the work area is clean and clear of tool(s) and other items.
(2)
Install the access panel (Ref. TASK 25-54-12-400-001).
(a)
FOR 4020HM
-131PW,
(b)
FOR 4021HM
-132PW.
(3)
Remove the access platform(s).
(4)
Close the FWD cargo-compartment door 865 (Ref. TASK 52-30-00-860-002).
(5) Remove the warning notice(s). Subtask 21-21-42-865-052
B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):
(1)
FOR 4020HM
-1HG, 2HG,
(2)
FOR 4021HM
-3HG, 11HG. Subtask 21-21-42-862-050
C. De-energize the aircraft electrical circuits (Ref. TASK 24-41-00-862-002) MIXER UNIT - REMOVAL/INSTALLATION
_________________________________
TASK 21-21-43-000-001
Removal of the Mixer Unit
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
______________________
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