B. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
29-14-00-614-001 Depressurization of the Hydraulic Reservoirs 29-23-00-864-001 Depressurize the Green and Yellow Hydraulic Systems
after Operation of the PTU 71-13-00-010-040 Opening of the Fan Cowl Doors 29-13-49-991-913 Fig. 410
3. Job Set-up
__________ Subtask 29-13-49-860-081
A. Aircraft Maintenance Configuration
(1)
Depressurize the Yellow hydraulic system (Ref. TASK 29-23-00-864-001).
(2)
Depressurize the Yellow hydraulic reservoir (Ref. TASK 29-14-00-614-001).
(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 29-13-49-941-081
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.
(2)
Make sure that the engine 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/2 pushbutton switch is off.
(5)
Put warning notice(s) to tell persons not to energize the FADEC 2.
(6)
Put a container below the tee fitting on the upper case drain tube.
Subtask 29-13-49-865-063
C. Open, safety and tag this(these) circuit breaker(s):
-------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------
121VU HYDRAULIC/Y HYD/PUMP ENG2/MONG 3700GD Q37
Subtask 29-13-49-010-069
D. Get Access
(1)
Open the fan-cowl doors:
-447AL, 448AR (Ref. TASK 71-13-00-010-040).
(2)
Open the access door 195BB.
(3)
Put the access platform in position at the engine.
4. Procedure
_________
(Ref. Fig. 410/TASK 29-13-49-991-913) Subtask 29-13-49-020-068
A. Removal of the Check Valve Restrictor Tubes
(1)
Disconnect the tube (15) from the tee fitting on the upper case drain tube. Let the fluid drain into the container below the tee fitting.
(2)
Remove the bolt (5), washer (20), nut (25), and clamp (10) that attach the tube (15) to the bracket at engine flange STA185 (B5).
(3)
Remove the bolt (5), washer (20), nut (25), and clamp (10) that attach the tube (15) to the bracket at engine flange STA199 (A2).
(4)
Disconnect the tube (30) from the tube (15).
(5)
Remove the bolts (5), washers (20), nuts (25), and clamps (10) that attach the tube (30) to the brackets at engine flange STA199 (A2). (3 locations)
(6)
Disconnect the tube (30) from the HCU.
(7)
Put protective covers on the tubes, the HCU, and the tee fitting.
(8)
Remove the tubes (15) and (30) from the engine.
(9)
Remove the container from below the tee fitting.
Check Valve Restrictor Tubes
Figure 410/TASK 29-13-49-991-913- 12 (SHEET 1)
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Check Valve Restrictor Tubes
Figure 410/TASK 29-13-49-991-913- 22 (SHEET 2)
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