R NOTE : For adjustment to zero value refer to working step A2c
____ R or A2d.
2 Slowly open the pressure control (18) to give a positive
_
pressure.
3 Increase the positive pressure until the safety valve opens.
_ NOTE : You know this when the position indicator lamp (22)
____
comes on.
4 When the position indicator lamp (22) comes on you must make a
_ note of the value shown on the pressure monitor. This value must be between 5 mbar (0.07 psi) and 18.6 mbar
(0.26 psi).
5 Close the pressure control (18).
_
6 Release the positive pressure.
_ NOTE : To do this you must disconnect the green coloured
____ connector at the pressure output (20).
7 Do the negative relief setpoint check at least 2 times more to
_ make sure the safety valve function is correct.
Subtask 21-31-00-080-053
C. Removal of the Test Equipment
(Ref. Fig. 501/TASK 21-31-00-991-001)
(1)
On the Aircraft
(a)
Disconnect these items:
-
The green coloured connectors of the flexible hose (17) and the flexible hose assembly (29) from the fixed pressure connector (16).
-
The orange coloured connector of the flexible hose assembly
(29) from the pivoted pressure connector (30).
-
The neutral coloured connector of the flexible hose assembly
(29) from the bulkhead connector (36).
(b)
Loosen the screw (31) and disengage the pivoted pressure connector from the poppet valve outlet (37).
(c)
Screw out the fixed pressure connector (16) to disengage it from the poppet valve (12).
(d)
Release the clamps (32) and remove the check device (15) from the bellmouth (14).
(e)
Disconnect the test wiring from the electrical connector (3).
(f)
Remove the check device (15) and the test wiring from the aircraft.
(2)
On the Test Set:
(a) Disconnect these items:
-
The green coloured connector of the flexible hose (17) from the pressure output connector (20).
-
The green coloured connector of the flexible hose assembly (29) from the pressure sense connector (21).
-
The orange coloured connector of the flexible hose assembly
(29) from the vacuum output connector (23)
-
The test wiring from the safety-valve position-switch connector (27).
-
The electrical power connector (26).
-
The pressure input (19) and the vacuum input (24).
Subtask 21-31-00-420-051
D. Aircraft Maintenance Configuration
(1)
Install the washer (35), the strainer (34) and the nut (33).
(2)
Remove the blanking caps from the disconnected electrical connectors.
(3)
Make sure that the electrical connectors are clean and in the correct condition.
(4)
Connect the electrical connector (2).
Subtask 21-31-00-865-061
E. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s): 1HL, 2HL, 3HL.
Subtask 21-31-00-710-061
F. Do the operational test of the safety valves and position indication (Ref. TASK 21-31-00-710-006).
1EFF : ALL 1 21-31-00Page 528 1 1 Feb 01/04R 1 1 1CES 1
5. Close-up
________
(Ref. Fig. 501/TASK 21-31-00-991-001) Subtask 21-31-00-410-053
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) and the food trolleys in the Aft galley.
(3)
Install the access panel 312AR.
(4) Remove the access platform(s). Subtask 21-31-00-862-059
B. De-energize the aircraft electrical circuits
(Ref. TASK 24-41-00-862-002).
1EFF : ALL 1 21-31-00Page 529 1 1 Feb 01/04R 1 1 1CES 1
TASK 21-31-00-760-001
Resistance Check of the Return Ground Connections - Cabin Pressure Controller (CPC) 1 (11HL) and 2 (12HL) and the Electronic Modules 10HL-1 and 10HL-2
1. Reason for the Job
__________________
Self Explanatory
2. Job Set-up Information
______________________
A. Fixtures, Tools, Test and Support Equipment
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