3. Job Set-up
__________ Subtask 21-21-41-860-050
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 AIR COND panel 30VU:
(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 panel is removed (Ref. TASK 25-54-12-000-001). 1 FOR 4012HM
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.
_
-131PW, 2 FOR 4013HM
_
-132PW.
Subtask 21-21-41-865-051
B. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged
-------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------FOR 4012HM
122VU AIR COND/RECIRC FAN/L/CTL 2HG X20 122VU AIR COND/RECIRC FAN/L/SPLY 1HG X18
FOR 4013HM 122VU AIR COND/RECIRC FAN/R/CTL 11HG W20 122VU AIR COND/RECIRC FAN/R/SPLY 3HG W18
4. Procedure
_________ (Ref. Fig. 401/TASK 21-21-41-991-001) Subtask 21-21-41-420-050
A. Installation of the Recirculation Filter
(1)
Remove the blanking plugs from the disconnected line ends.
(2)
Put the recirculation filter (3) in position in the frame (1).
(3)
Push in the fastener (2) and turn it clockwise to the LOCKED position.
(4)
Make sure that the work area is clean and clear of tool(s) and other items.
5. Close-up
________ Subtask 21-21-41-410-051
A. Close Access
(1)
Install the access panel (Ref. TASK 25-54-12-400-001):
(a)
FOR 4012HM
-131PW
(b)
FOR 4013HM
-132PW.
(2)
Remove the access platform.
(3)
Close the FWD cargo-compartment door 825.
(4) Remove the warning notice(s).
Subtask 21-21-41-865-052
B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s): FOR 4012HM 1HG, 2HG. FOR 4013HM 3HG, 11HG.
Subtask 21-21-41-862-050
C. De-energize the aircraft electrical circuits (Ref. TASK 24-41-00-862-002) R
CHECK VALVE (4020HM,4021HM) - REMOVAL/INSTALLATION
__________________________________________________ TASK 21-21-42-000-001 Removal of the Recirculation Check Valve 4020HM (4021HM) 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.
NOTE : The procedure is the same for the recirculation check valves 4020HM
____ (4021HM).
1.
Reason for the Job
__________________
Self Explanatory
2.
Job Set-up Information
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