(c)
Make sure that the pressure at the bottom charging valve (3) is the same as the pressure shown on the graph line (for the measured temperature) +/- 1 bar (14.5037 psi).
(d)
Close these valves:
-
the bottom charging valve (3)
-
the control valve (25)
-
the control valve (23)
-
the supply valve on the nitrogen source.
(e)
After five minutes, open the bottom charging valve (3). Make sure that the pressure at the bottom charging valve (3) is the same as the pressure shown on the graph line (for the measured temperature) +/- 1 bar (14.5037 psi).
(30)
Refer to the diagram 3. If the pressure at the top charging valve (1) is above the graph line (for the measured temperature), do these steps:
(a)
Close the supply valve on the nitrogen source.
(b)
Open the bottom charging valve (3).
(c)
Slowly open the control valve (23) to release some nitrogen.
(d)
Immediately the shock absorber starts to move, close the control valve (23).
NOTE : The pressure at the top charging valve will decrease
____ because nitrogen was removed without sufficient shock absorber movement.
(e)
After five minutes, open the top charging valve (1).
(f)
At the top charging valve (1), measure the pressure and the temperature.
1EFF : ALL 1 12-14-32Page 360 1 1 Aug 01/05R 1 1 1CES 1
(g)
Use the diagram 1 to find the dimension H that you need for the conditions at step (f).
(h)
Slowly open the control valve (23) (to release nitrogen) until the dimension H is the same as the dimension H found in diagram 1, +/- 2.0 mm (0.0787 in.).
(i)
Close the bottom charging valve (3) and the control valve (23).
(j)
After five minutes, open the top charging valve (1) and read and record the pressure.
(k)
Close the top charging valve (1).
(l)
Open the bottom charging valve (3) and read and record the pressure.
(m)
Close the bottom charging valve (3).
(n)
Make sure that the pressures at the top charging valve (1) and the bottom charging valve (3) are the same +/- 1.5 bar (21.7556 psi). If the pressures are not in this limit, do the procedure from step (17) again.
(31)
Remove the nitrogen supply hose (24) from the three-way valve (22).
(32)
Remove the filling hoses (21) from the charging valves (1) and (3).
(33)
TORQUE the charging valves (1) and (3) to between 0.57 and 0.79 m.daN
(50.44 and 69.91 lbf.in).
(34)
Use SPECIAL MATERIALS (Material No. 05-004B) to do a leak check of the charging valves (1) and (3).
(35)
Install the blanking cap (2) on the top charging valve (1).
(36)
Install the blanking cap (4) on the bottom charging valve (3).
(37)
Remove the pressure gages (20) and the filling hoses (21) from the three-way valves (22).
(38)
Do the Para. 4.B again for the other shock absorber.
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Subtask 12-14-32-614-081
C. MLG Two-Stage Shock Absorber - Check Charge Pressure and Fill with Nitrogen (Aircraft on Jacks)
WARNING : MAKE SURE THAT THE STANDARD CHARGING EQUIPMENT IS SAFE TO USE
_______ ABOVE 140 BAR (2030.5278 PSI). THIS WILL PREVENT INJURY AND DAMAGE.
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.
CAUTION : MAKE SURE THAT YOU USE A GAGE WITH THE SPECIFIED PRESSURE
_______ RANGE. THIS IS NECESSARY TO GET AN ACCURATE PRESSURE MEASUREMENT.
NOTE : To do this procedure it is necessary to have 2 standard charging
____ equipments, 1 pressure gage 140 bar (2030.5278 psi) and 1 pressure gage 17 bar (246.5640 psi). The charging equipment must be safe to use at over 140 bar (2030.5278 psi).
(1)
Make sure that the aircraft is positioned correctly on the jacks (Ref. TASK 07-11-00-581-001).
(2)
Make sure that the shock absorber is fully extended and that the dimension H is between 496.7 mm (19.5551 in.) and 500.5 mm (19.7047 in.).
(a) If you do this procedure after you have replenished the shock absorber with hydraulic oil (Ref. TASK 12-12-32-611-008), you must:
1_ Charge the top charging valve (first stage of the cylinder)
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