(3)
Put warning notice(s) in position to tell persons not to pressurize the Yellow hydraulic system: - on the ground service panel 198CB.
(4)
Put warning notice(s) on the access door 195BB to tell persons not to pressurize the Yellow hydraulic reservoir.
Subtask 29-13-49-941-073
B. Safety Precautions
(1)
On the center pedestal, on the ENG panel 115VU:
-put warning notice(s) to tell persons not to start the engine.
(2)
Make sure that the engine 1(2) shutdown occurred not less than 5 minutes before you do this procedure.
(3)
Put warning notice(s) in position to tell persons not to pressurize the Yellow hydraulic system:
-in the cockpit, on the HYD section of the overhead panel 40VU.
(4)
On the overhead maintenance panel 50VU:
-make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off.
(5)
Put warning notice(s) to tell persons not to energize the FADEC 1(2).
(6)
Put a container below the higher pressure relief valve hose/tube (25) to collect the remaining fluid.
Subtask 29-13-49-010-068
C. Get Access
R (1) Open the left fan-cowl door (Ref. TASK 71-13-00-010-040): FOR 1000EM2 open the door 447AL.
(2)
Put the access platform in position at the left fan-cowl door 447AL. Subtask 29-13-49-865-061
D.
Open, safety and tag this(these) circuit breaker(s):
-------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------
121VU HYDRAULIC/Y HYD/PUMP ENG2/MONG 3700GD Q37
4. Procedure
_________
(Ref. Fig. 408/TASK 29-13-49-991-911, 409/TASK 29-13-49-991-912)
Subtask 29-13-49-020-067
A. Removal of the Pressure Relief Valve Hose/Tube
(1) Disconnect the higher pressure relief valve hose/tube (25) from the lower pressure relief valve tube (30) and let the fluid flow in the container.
NOTE : Use a second wrench to hold the lower pressure relief valve
____ tube when you loosen the coupling nut on the higher pressure relief valve tube.
(2)
Disconnect the pressure relief valve hose/tube (25) from the pressure relief valve interface.
(3)
Remove the bolts (5), the washers (10), the nuts (15) and the clamps
(20) that attach the pressure relief valve hose/tube (25) to the engine brackets at the flange STA.199(A2).
(4)
Remove the pressure relief valve hose/tube (25) from the engine.
(5)
Put protective covers on the pressure relief valve tube (30), the fitting on the top case drain hose/tube and the pressure relief valve hose/tube (25).
(6)
Put a container below the lower pressure relief valve tube (30) to
collect the remaining fluid.
(7)
Disconnect the lower pressure relief valve tube (30) from the top
case drain hose/tube and let the fluid flow in the container.
Pressure Relief Valve Hose/Tube
Figure 408/TASK 29-13-49-991-911
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Pressure Relief Valve Hose/Tube
Figure 409/TASK 29-13-49-991-912
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NOTE : Use a second wrench to hold the fitting on the case drain tube
____ when you loosen the coupling nut on the pressure relief valve tube.
(8) If not done before, disconnect the lower pressure relief valve tube
(30) from the upper pressure relief valve hose/tube (25).
NOTE : Use a second wrench to hold the lower pressure relief valve
____ tube when you loosen the coupling nut on the higher pressure relief valve tube.
(9) Remove the bolt (5), the washer (10), the nut (15) and the clamp (20) that attach the lower pressure relief valve tube to the engine bracket at the flange STA.199(A2).
(10)
Remove the bolt (5), the washer (10), the nut (15) and the clamp (20) that attach the lower pressure relief valve tube to the engine bracket at flange STA.185(B5).
(11)
Remove the lower pressure relief valve tube (30) from the engine.
(12)
Put protective covers on the lower pressure relief valve tube (30), the fitting on the top case drain hose/tube and the higher pressure relief valve hose/tube (25).
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