(f)
 Install the filter (4).

 (g)
 Install the filter cover (5).

 (h)
 Push the filter cover (5) and turn clockwise until the pins (2) engage.

 (2)
 Install the safety valve filter (without cover)

 (a)
 Clean the component interface and/or the adjacent area.

 (b)
 Do an inspection of the component interface and/or the adjacent area.

 (c)
 Apply a small quantity of glycerin to the new O-ring (3).

 (d)
 Put the O-ring (3) in position on the new filter (4).

 (e)
 Install the filter (4).

 (f)
 Safety the filter (4) with corrosion-resistant steel lockwire 0.6 mm (0.0024 in.) dia.

 1EFF : ALL 1 21-31-52Page 304 1 1 Nov 01/01R 1 1 1CES 1

 5. Close-up
________ Subtask 21-31-52-410-052
 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 (1).

 (3) Replace the food trolleys in the Aft galley. Subtask 21-31-52-862-050
 B. De-energize the aircraft electrical circuits (Ref. TASK 24-41-00-862-002).

 VALVE - SAFETY (6HL,7HL) - REMOVAL/INSTALLATION
_______________________________________________
 TASK 21-31-52-000-001
 Removal 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
 -------------------------------------------------------------------------------
No specific blanking caps
 No specific blanking plugs
 No specific circuit breaker(s) safety clip(s)

 B. Referenced Information
 -------------------------------------------------------------------------------
REFERENCE  DESIGNATION
 -------------------------------------------------------------------------------
24-41-00-861-002  Energize the Aircraft Electrical Circuits from the External Power R 52-41-00-010-002 Open the Avionics Compartment Doors for Access 21-31-52-991-001 Fig. 401
 3. Job Set-up
__________
 Subtask 21-31-52-861-051

 A. Energize the aircraft electrical circuits (Ref. TASK 24-41-00-861-002).

 Subtask 21-31-52-865-050
 B. Open, safety and tag this(these) circuit breaker(s):
 -------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------49VU AIR COND/CAB/PRESS/CTL1 1HL D09 122VU AIR COND/CAB PRESS/CTL/2 2HL Y22
 Subtask 21-31-52-010-051
 C. Open the FWD avionics access door 811 (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.
 (1)
 Remove the food trolleys from the Aft galley.

 (2)
 Remove the access panel (1).

 4. Procedure
_________
 (Ref. Fig. 401/TASK 21-31-52-991-001)
 Subtask 21-31-52-020-053

 A. Removal of the Safety Valve
R (1) If installed remove the safety wire from the electrical connector R (2).
 (2)
 Disconnect the electrical connector (2).

 (3)
 Put blanking caps on the disconnected electrical connectors.

 (4)
 Remove the nut (8), the washer (7), the screw (5) and disconnect the bonding strap (6).

 (5)
 Disconnect the ambient-pressure sense line (4).

 Safety Valves 6HL (7HL).
 Figure 401/TASK 21-31-52-991-001
 1EFF :  ALL  1  21-31-52 Page 403 
1  1  Feb 01/98
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