NLG Pressure/Extension Data - Aircraft on the Ground Figure 314/TASK 12-14-32-991-007- 78 (SHEET 7)
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NLG Pressure/Extension Data - Aircraft on the Ground Figure 314/TASK 12-14-32-991-007- 88 (SHEET 8)
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(12) If the dimension H is incorrect:
(a)
Connect the nitrogen supply hose (16) of the nitrogen source to the 3-way valve (13).
(b)
Open the control valve of the nitrogen source. Open the control valve (15) and adjust the nitrogen source to give the necessary pressure.
CAUTION : ALWAYS ADD NITROGEN SLOWLY WHEN YOU PRESSURIZE THE
_______ SHOCK ABSORBER. IF YOU ADD THE NITROGEN TOO QUICKLY, THE TEMPERATURE WILL INCREASE AND HAVE AN EFFECT ON THE SHOCK ABSORBER PRESSURE.
(c)
Slowly open the charging valve (2) with the FILLING ASSEMBLY.
(d)
Monitor the dimension H and adjust the pressure until the dimension H is correct.
(e)
When the dimension H is correct, close the charging valve (2).
(f)
Close the control valve of the nitrogen source. Open the control valve (14) to release the pressure and remove the nitrogen source from the 3-way valve (13).
(13)
When the pressure/extension is correct, remove the pressure gage (11).
(14)
Remove the FILLING ASSEMBLY and the standard charging equipment.
(15)
TORQUE the charging valve nut (2) to between 0.5 and 0.8 m.daN (44.24 and 70.79 lbf.in) and examine for leaks.
(16) Install the blanking cap (1) on the charging valve (2). Subtask 12-14-32-614-059
B. Aircraft on Jacks - Nitrogen Filling of the NLG Shock Absorber
(Ref. Fig. 313/TASK 12-14-32-991-017, 315/TASK 12-14-32-991-030)
(1)
Make sure that the shock absorber is extended fully.
(2)
Remove the blanking cap (1) from the charging valve (2).
(3)
Install the FILLING ASSEMBLY on the charging valve (2).
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Pressure/Temperature Table - Shock Absorber Fully Extended
Figure 315/TASK 12-14-32-991-030
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(4)
Install the standard charging equipment on the FILLING ASSEMBLY, as follows:
(a)
Connect the filling hose (12) to the FILLING ASSEMBLY. CAUTION : MAKE SURE THAT YOU USE A GAGE WITH THE SPECIFIED
_______ PRESSURE RANGE. THIS IS NECESSARY TO GET AN ACCURATE PRESSURE MEASUREMENT.
(b)
Install the pressure gage (11) on the 3-way valve (13).
(c)
Connect the 3-way valve (13) to the filling hose (12).
(Ref. Fig. 312/TASK 12-14-32-991-006)
(5)
Make sure that the control valves (14) and (15) are closed.
(6)
Open the charging valve (2). Record the indication on the pressure gage (11) then close the charging valve (2).
(7)
Use a thermometer (-45 Deg.C to 70 Deg.C) to measure and record the temperature adjacent to the charging valve (2).
(8)
Refer to the table and use the recorded temperature and pressure values to identify the correct charge pressure necessary. (Ref. Fig. 315/TASK 12-14-32-991-030)
(9)
If the recorded value does not agree with the charge pressure given, do the procedure that follows:
(a)
Connect the nitrogen source to the 3-way valve (13) with the supply hose (16).
(b)
Open the control valve (15) to increase the pressure gage (11) indication to the necessary value given in the table.
CAUTION : ALWAYS ADD NITROGEN SLOWLY WHEN YOU PRESSURIZE THE
_______ SHOCK ABSORBER. IF YOU ADD THE NITROGEN TOO QUICKLY, THE TEMPERATURE WILL INCREASE AND HAVE AN EFFECT ON THE SHOCK ABSORBER PRESSURE.
(c)
Slowly open the charging valve (2) to adjust the charge pressure in the shock absorber.
(d)
When the charge pressure is correct, close the charging valve (2).
(e)
Stop the nitrogen supply and remove the nitrogen source from the 3-way valve (13).
(10)
Remove the FILLING ASSEMBLY and the standard charging equipment from the charging valve (2).
(11)
TORQUE the charging valve (2) to between 0.5 and 0.8 m.daN (44.24 and
70.79 lbf.in) and examine for leaks.
(12)
Install the blanking cap (1) on the charging valve (2).
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