(2)
Do the operational test of the manual pressure control and monitoring system (Ref. TASK 21-31-00-710-003).
5. Close-up
________ Subtask 21-31-51-410-062
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 162CW (Ref. TASK 25-55-12-400-003).
(3)
Remove the access platform(s).
(4)
Remove the warning notice and close the AFT cargo-compartment door 826 (Ref. TASK 52-30-00-860-002).
Subtask 21-31-51-862-056
B. De-energize the aircraft electrical circuits (Ref. TASK 24-41-00-862-002).
VALVE - SAFETY (6HL,7HL) - SERVICING
____________________________________ TASK 21-31-52-610-001 Scheduled Replacement of the Safety Valve Filter 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 and 7HL.
____
1.
Reason for the Job
__________________
Refer to the MPD TASK: 213100-06
2.
Job Set-up Information
______________________
A. Consumable Materials
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
No specific corrosion-resistant steel lockwire 0.6 mm (0.0024 in.) dia. No specific glycerin
B. Expendable Parts
-------------------------------------------------------------------------------FIG.ITEM |DESIGNATION |IPC-CSN -------------------------------------------------------------------------------
3 O-ring 21-31-52 02 -030 4 filter 21-31-52 02 -020
1EFF : ALL 1 21-31-52Page 301 1 1 Nov 01/01R 1 1 1CES 1
C. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
24-41-00-861-002 24-41-00-862-002 R 21-31-52-991-002
3. Job Set-up
__________
Energize the Aircraft Electrical Circuits from the External PowerDe-energize the Aircraft Electrical Circuits Supplied from the External Power Fig. 301
R (Ref. Fig. 301/TASK 21-31-52-991-002) Subtask 21-31-52-861-050
A. Energize the aircraft electrical circuits (Ref. TASK 24-41-00-861-002). Subtask 21-31-52-010-052
B. Get Access
(1)
Remove the food trolleys from the Aft galley.
(2)
Remove the access panel (1).
4. Procedure
_________ R (Ref. Fig. 301/TASK 21-31-52-991-002) Subtask 21-31-52-020-054
A. Removal of the Safety Valve Filter
(1)
Remove the safety valve filter (with cover)
(a)
Push the filter cover (5) and turn counter clockwise until the pins (2) disengage.
(b)
Remove the filter cover (5).
(c)
Remove and discard the safety valve filter (4) and the O-ring (3).
(2)
Remove the safety valve filter (without cover)
(a)
Remove and discard the lockwire.
(b)
Remove and discard the safety valve filter (4) and the O-ring (3).
Removal of the Safety Valve Filter Figure 301/TASK 21-31-52-991-002
1EFF : 1 1R 1CES ALL 1 11 1 21-31-52 Page 303 Nov 01/01
Subtask 21-31-52-420-051
B. Installation of the Safety Valve Filter
(1)
Install the safety valve filter (with 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)
Make sure that the parts retained from the removed component are clean and in the correct condition.
(d)
Apply a small quantity of glycerin to the new O-ring (3).
(e)
Put the 0-ring (3) in position on the new filter (4).
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