(7)
Use diagram 1 to find the dimension H for the pressure at the top charging valve for the measured temperature.
(8)
If the measured dimension H is between +/- 15 mm (0.5905 in.) of the dimension H shown in diagram 1, do the steps that follow:
NOTE : The measured H dimension can be as low as 30 mm (1.1811 in.)
____ at very low ambient temperatures. This is usual for a shock absorber in good condition and no maintenance action is necessary (if the measured H dimension is between +/- 15 mm (0.5905 in.) of the correct value).
(a)
Make sure that the control valve (25) is closed.
(b)
Open the control valve (23) to release all pressure from the filling hose (21).
(c)
Close the control valve (23).
(d)
Remove the pressure gage (20) from the three-way valve (22).
(e)
Disconnect the filling hose (21) from the top charging valve (1) and the three-way valve (22).
(f)
Install the blanking cap (2) on the top charging valve (1).
(g)
Do the close-up procedure in Para. 5.A.
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(9) If the measured dimension H is not between +/- 15 mm (0.5905 in.) of the dimension H shown in diagram 1, do the steps (10) thru (36).
NOTE : If the measured H dimension is less than 33 mm (1.2992 in.) do
____ the nitrogen filling procedure with the aircraft on jacks (if the measured H dimension is not between +/- 15 mm (0.5905 in.) of the correct value). Refer to Para 4.C.
(10) Install the second standard charging equipment on the bottom charging valve (3):
NOTE : If the equipment manufacturers assembly/operating instructions
____
are different to the data given, use the equipment
manufacturers instructions.
(a)
Remove the blanking cap (4) from the bottom charging valve (3).
(b)
Make sure that the control valves (23) and (25) are closed.
(c)
Connect the filling hose (21) to the three-way valve (22).
(d)
Connect the filling hose (21) to the bottom charging valve (3).
(e)
Install the second pressure gage 140 bar (2030.5278 psi) (20) on the three-way valve (22).
(11)
Slowly open the top charging valve (1).
(12)
At the top charging valve (1), read and record the pressure shown on the pressure gage (20).
(13)
Close the top charging valve (1).
(14)
Slowly open the bottom charging valve (3).
(15)
At the bottom charging valve (3), read and record the pressure shown on the pressure gage (20).
(16)
Close the bottom charging valve (3).
(17)
The pressure at the bottom charging valve (3) must be 18 bar (261.0678 psi) more than the pressure at the top charging valve (1). If not, do the steps that follow:
NOTE : This makes sure that the floating piston is at the top of the
____ second stage cylinder before you do the nitrogen filling.
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NOTE : It is possible that a small quantity of hydraulic fluid can be
____ released from the charging valve when nitrogen is discharged. If the volume of fluid that flows from the bottom charging valve is more than 0.6 l (0.1585 USgal):
-you must replenish the MLG shock absorber hydraulic oil (Ref. TASK 12-12-32-611-008)
-refer to the MLG Design Authority.
(a)
Make sure that the control valves (23) and (25) are closed.
(b)
Connect the nitrogen supply hose (24) to the three-way valve (22) which is connected to the bottom charging valve (3).
(c)
Open the supply valve on the nitrogen source.
(d)
Slowly open the control valve (25) to increase the nitrogen pressure at the bottom charging valve (3).
(e)
Open the bottom charging valve (3).
(f)
The pressure at the bottom charging valve (3) must be between 18 bar (261.0678 psi) and 21 bar (304.5791 psi) more than the pressure at the top charging valve (1).
(g)
Close the control valve (25).
(h)
After ten minutes (to let the pressure and temperature become stable) check that the condition at step (f) is the same.
(i)
If it is not the same, do the steps (d) thru (h) again.
(j)
Close the bottom charging valve (3).
(k)
Close the supply valve on the nitrogen source and remove the nitrogen supply hose (24) from the three-way valve (22).
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本文链接地址：A320飞机维护手册 AMM SERVICING 1(101)
