______________________
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 21-21-42-991-001 Fig. 401
3. Job Set-up
__________ Subtask 21-21-42-861-050
A. Energize the aircraft electrical circuits (Ref. TASK 24-41-00-861-002).
Subtask 21-21-42-865-050
B. Open, safety and tag this(these) circuit breaker(s):
-------------------------------------------------------------------------------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
Subtask 21-21-42-941-050
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 ground connector put a warning notice in position to tell persons not to supply the ground air.
Subtask 21-21-42-010-050
D. Get Access
(1)
Open the FWD cargo-compartment door 865 (Ref. TASK 52-30-00-860-001).
(2)
Put the access platform in position at the FWD cargo-compartment door
865.
(3)
Remove the access panel (Ref. TASK 25-54-12-000-001).
(a)
FOR 4020HM
-131PW,
(b)
FOR 4021HM
-132PW.
4. Procedure
_________
(Ref. Fig. 401/TASK 21-21-42-991-001) Subtask 21-21-42-020-050
A. Removal of the Recirculation Check Valve
(1)
Remove the clamp (4) and disconnect the sleeve (5).
(2)
Remove the clamp (1).
(3)
Carefully remove the flange (3) together with the recirculation check valve (2).
(4)
Remove the recirculation check valve (2) from the flange (3).
(5)
Put blanking plugs on the disconnected line ends.
Recirculation Check Valve 4020HM (4021HM).
Figure 401/TASK 21-21-42-991-001
1EFF : ALL 1 21-21-42 Page 404
1 1 Feb 01/98
1 1
1CES 1
TASK 21-21-42-400-001
Installation 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
______________________
A. Fixtures, Tools, Test and Support Equipment
-------------------------------------------------------------------------------
REFERENCE QTY DESIGNATION
-------------------------------------------------------------------------------
No specific access platform 2 m (6 ft. 7 in.)
R No specific Torque Wrench : range 0.00 to 1.20 m.daN
R (0.00 to 9.00 lbf.ft)
B. Referenced Information
-------------------------------------------------------------------------------
REFERENCE DESIGNATION
-------------------------------------------------------------------------------
24-41-00-861-002 Energize the Aircraft Electrical Circuits from the External Power 24-41-00-862-002 De-energize the Aircraft Electrical Circuits Supplied
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