(3)
Put a warning notice in position to tell persons not to operate the landing gear doors.
Subtask 12-12-32-582-055
B. Lift the Aircraft
(1)
Lift the aircraft on jacks (Ref. TASK 07-11-00-581-001).
(2)
Put the access platform in position at the applicable shock absorber.
4. Procedure
_________ R (Ref. Fig. 305/TASK 12-12-32-991-009, 306/TASK 12-12-32-991-008) Subtask 12-12-32-611-059
A. Hydraulic Replenishment of the MLG Two-Stage Shock Absorber
(1)
Remove the blanking cap (2) from the bottom charging valve (1).
(2)
Remove the blanking cap (3) from the top charging valve (4).
(3)
Release the nitrogen pressure:
(a)
Slowly open the bottom charging valve assembly (1).
(b)
Slowly open the top charging valve assembly (4). NOTE : During the steps that follow some oil can come out of the
____
top charging valve (4).
MLG Two Stage Shock Absorber - Replenishment Location and Detail R Figure 305/TASK 12-12-32-991-009
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R MLG Two Stage Shock Absorber - Filling System Figure 306/TASK 12-12-32-991-008
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(4)
Remove and discard the lockwire from the body of the top charging valve (4).
(5)
Remove the top charging valve assembly (4).
(6)
Remove and discard the packing (5) from the top charging valve assembly (4).
(7)
Install the standard charging equipment on the two-stage shock absorber:
(a)
Install the filler adaptor (17) in the port of the top charging valve.
(b)
TORQUE the filler adaptor (17) to between 1.13 and 1.58 m.daN
(99.99 and 139.82 lbf.in).
(c)
Connect the elbow-fitting (18) to the filler adaptor (17).
(d)
Connect the filling hose (16) to the elbow fitting (18).
(e)
Install the 28 bar (406.1055 psi) pressure gage (15) on the three-way valve (19).
(f)
Connect the three-way valve (19) to the filling hose (16).
(g)
Connect the hydraulic pump (24) and the hydraulic fluid reservoir
(23) to the three-way valve (19) with the supply hose (25).
(h)
Fill the hydraulic fluid reservoir with HYDRAULIC FLUIDS (Material No. 02-001) or HYDRAULIC FLUIDS (Material No. 02-004).
(i)
Connect the bleed hose (21) between the three-way valve (19) and the drain container (22).
(j)
Open the control valves (20) and (27).
(k)
Bleed the filling system with the hydraulic pump (24).
(8)
Put the axle jack in position under the jacking dome (6) of the applicable landing gear. Make sure that the axle jack is free to move forward and aft.
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(9) Fill the shock absorber with hydraulic fluid: CAUTION : DO NOT LET THE HYDRAULIC PRESSURE INCREASE TO MORE THAN 22
_______ BAR (319 PSI). IF THE PRESSURE IS MORE THAN THIS VALUE, IT CAN CAUSE DAMAGE TO THE SHOCK ABSORBER.
NOTE : 20 l (5.2833 USgal) of hydraulic fluid is necessary to fill
____
each shock absorber.
(a)
Make sure that:
-
the bottom charging valve (1) is open
-
the control valve (20) is open
-
the control valve (27) is closed.
(b)
Use the axle jack to fully compress the shock absorber. At the same time, monitor the hydraulic fluid that goes into the drain container (22).
NOTE : It is possible that no hydraulic fluid will be bled into
____ the drain container (22) when you initially compress the shock absorber.
(c)
Close the control valve (20) and open the control valve (27).
(d)
Use the hydraulic pump (24) to slowly increase the pressure of the hydraulic supply to 13.8 bar (200.1520 psi). Let the pressure become stable.
(e)
Keep the pressure of the hydraulic supply at 13.8 bar (200.1520 psi). At the same time, slowly lower the axle jack to let the shock absorber fully extend.
(f)
When the shock absorber is fully extended, let the pressure become stable at 13.8 bar (200.1520 psi).
(g)
Release the hydraulic supply pressure.
(h)
Close the control valve (27) and open the control valve (20).
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