R  (6) Put blanking plugs on the disconnected line ends. 
R  (7) Hold the safety valve (3) and remove the clamp (9). 
R  (8) Remove the safety valve (3) and the O-ring (10). 
R  (9) Put blanking caps on the open ends of the safety valve (3) and the
 mounting flange (11).

 TASK 21-31-52-400-001 Installation of the Safety Valve 6HL (7HL) 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 safety valves 6HL (7HL).
____
 1.
 Reason for the Job

__________________
 Self Explanatory

 2.
 Job Set-up Information

______________________
 A. Fixtures, Tools, Test and Support Equipment
 -------------------------------------------------------------------------------
REFERENCE  QTY DESIGNATION
 -------------------------------------------------------------------------------
R No specific Torque Wrench : range 0.00 to 1.20 m.daN
R (0.00 to 9.00 lbf.ft)

 B. Expendable Parts
 -------------------------------------------------------------------------------
FIG.ITEM |DESIGNATION  |IPC-CSN
 -------------------------------------------------------------------------------
10 O-ring  21-31-04 10 -020
 C. Referenced Information
 -------------------------------------------------------------------------------
REFERENCE  DESIGNATION
 -------------------------------------------------------------------------------
20-28-00-912-004  Electrical Bonding of Components With Conductive Bolts and Screws and Bonding Straps in the Fuselage and in the Wings (this does not include the tanks)-
21-31-00-710-006 Operational Test of Safety Valve Position Indication 24-41-00-862-002 De-energize the Aircraft Electrical Circuits Supplied
 from the External Power 52-41-00-010-002 Open the Avionics Compartment Doors for Access 52-41-00-410-002 Close the Avionics Compartment Doors after Access

 3. Job Set-up
__________ Subtask 21-31-52-860-050
 A. Aircraft Maintenance Configuration
 (1) Make sure that:
 (a) The FWD avionics-bay access-door 811 is open (Ref. TASK 52-41-00-010-002).
 WARNING : OPEN THE ACCESS DOOR AND MAKE SURE IT STAYS OPEN.
_______ ATTACH A WARNING NOTICE TO THE ACCESS DOOR TO TELL PERSONS NOT TO CLOSE IT. THIS IS TO PREVENT ACCIDENTAL PRESSURIZATION OF THE AIRCRAFT BY THE AIR CONDITIONING SYSTEM IF ALL THE OTHER CABIN OPENINGS ARE CLOSED. PRESSURIZATION OF THE AIRCRAFT CAN BE DANGEROUS. IT CAN CAUSE A DOOR TO OPEN WITH EXPLOSIVE FORCE WHICH CAN CAUSE INJURY AND/OR DAMAGE.
 (b) The food trolleys are removed from the Aft galley.
 (c) The panel (1) is removed. Subtask 21-31-52-865-051
 B. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged
 -------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------49VU AIR COND/CAB/PRESS/CTL1 1HL D09 122VU AIR COND/CAB PRESS/CTL/2 2HL Y22
 4. Procedure
_________ Subtask 21-31-52-420-050
 A. Installation of the Safety Valve WARNING : WEAR GOGGLES WHEN YOU REMOVE OR INSTALL THE LOCKWIRE. CUT,
_______ REMOVE AND DISCARD THE LOCKWIRE AS YOU DO THE TASK. LOOSE LOCKWIRE CAN CUT OR BLIND YOU.
 1EFF : ALL 1 21-31-52Page 406 1 1 May 01/05R 1 1 1CES 1

 (1)
 Remove the blanking plugs from the mounting flange (11) and the
 safety valve (3).

 (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)
 Make sure that the O-ring (10) is in a good condition. If necessary renew the O-ring (10).

 (5)
 Put the O-ring (10) and the safety valve (3) in position on the
 mounting flange (11).

 (6)
 Install the clamp (9).
 NOTE : Look in the Aft direction and make sure that:

____
 -
For the safety valve 6HL the locking device of the clamp (9) is in the 3 o'clock position.

 -
For the safety valve 7HL the locking device of the clamp (9) is in the 9 o'clock position.

 Do not fully tighten the clamp (9) at this time.
 (7)
 Remove the blanking plugs and install the ambient-pressure sense line (4).
　
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