(2)
Install the new recirculation filter (3) (Ref. TASK 21-21-41-400-001).
Recirculation Filter
Figure 301/TASK 21-21-41-991-003
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FILTER - RECIRCULATION (4012HM,4013HM) - REMOVAL/INSTALLATION
_____________________________________________________________
TASK 21-21-41-000-001 Removal of the Recirculation Filter 4012HM (4013HM) 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 filters 4012HM and
____ 4013HM.
1.
Reason for the Job
__________________
Self Explanatory
2.
Job Set-up Information
______________________
A. Fixtures, Tools, Test and Support Equipment
-------------------------------------------------------------------------------REFERENCE QTY DESIGNATION -------------------------------------------------------------------------------
No specific blanking plugs
No specific circuit breaker(s) safety clip(s)
No specific access platform 2 m (6 ft. 7 in.)
B. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
24-41-00-861-002 Energize the Aircraft Electrical Circuits from the
External Power 25-54-12-000-001 Removal of the FWD Cargo Compartment Partition FR34 52-30-00-860-001 Open the FWD or AFT Cargo-Compartment Door with the
Yellow Electric Pump 21-21-41-991-001 Fig. 401
3. Job Set-up
__________ Subtask 21-21-41-861-050
A. Energize the aircraft electrical circuits (Ref. TASK 24-41-00-861-002).
Subtask 21-21-41-865-050
B. Open, safety and tag this(these) circuit breaker(s):
-------------------------------------------------------------------------------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
Subtask 21-21-41-941-050
C. Safety Precautions
(1) On the AIR COND panel 30VU:
(a) Make sure that: 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).
(b) Put a warning notice in position to tell persons not to operate these pushbutton switches.
(2) On the HP and the LP ground connectors:
(a) Put a warning notice in position to tell persons not to supply the ground air.
Subtask 21-21-41-010-050
D. Get Access
(1)
Open the FWD cargo-compartment door 825 (Ref. TASK 52-30-00-860-001).
(2)
Put the access platform in position at the FWD cargo-compartment door
825.
(3)
Remove the access panel (Ref. TASK 25-54-12-000-001):
(a)
FOR 4012HM
-131PW,
(b)
FOR 4013HM
-132PW.
4. Procedure
_________
(Ref. Fig. 401/TASK 21-21-41-991-001) Subtask 21-21-41-020-050
A. Removal of the Recirculation Filter
(1)
Hold the recirculation filter (3) and turn the fastener (2) counterclockwise to the UNLOCKED position.
(2)
Remove the recirculation filter (3).
(3)
Put blanking plugs on the disconnected line ends.
Recirculation Filter
Figure 401/TASK 21-21-41-991-001
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TASK 21-21-41-400-001
Installation of the Recirculation Filter 4012HM (4013HM)
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.
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