(2)
Loosen the nut of the case drain hose of the PTU so that the air (or hydraulic fluid mixed with air bubbles) comes out of the connection.
(3) Tighten the nut of the case drain hose when the hydraulic fluid flows freely.
(4) TORQUE the nut of the case drain hose to between 2.9 and 3.2 m.daN (21.38 and 23.59 lbf.ft).
(5) Do the subsequent steps to make sure that there is no air in the hydraulic system:
(a) Do a check of the fluid level of the Yellow reservoir.
(b) If it is necessary to add fluid:
R 1_ Depressurize the reservoir (Ref. TASK 29-14-00-614-001).
2_ Keep the reservoir depressurization valve (3087GM) open and fill the reservoir (Ref. TASK 12-12-29-611-002) or (Ref. TASK 12-12-29-611-001).
(c) Make sure that the air pressure in the reservoir of the Yellow hydraulic system is not less than 50 psi (3.4473 bar). If necessary, pressurize the reservoir (Ref. TASK 29-14-00-614-002).
R (d) Read the gage of the Yellow reservoir and record fluid level.
(e) Depressurize the reservoir of the Yellow hydraulic system. (Ref. TASK 29-14-00-614-001).
R (f) After 5 minutes, read the gage again and record the fluid level.
R (g) Compare the two levels.
R R (h) If the difference between the two levels is more than 1 liter, do the bleeding procedure again.
R NOTE : Do not do the bleeding procedure more than two times.____
R R R R R R R R (i) If the result is not satisfactory after you do the bleeding two times you must: - do the bleeding procedure of the Yellow hydraulic system upstream of the engine pump (Ref. TASK 29-00-00-870-004) - do the bleeding procedure of the Yellow hydraulic system upstream of the Yellow E-Pump (Ref. TASK 29-00-00-870-006) - do the bleeding procedure of the Yellow hydraulic system downstream of the engine pump (Ref. TASK 29-00-00-870-007).
5. Close-up
________ Subtask 29-00-00-860-066
A. Put the aircraft back to the serviceable condition.
(1)
Remove the container.
(2)
Make sure that the level of the hydraulic fluid in the reservoir of the Yellow hydraulic system is correct. Add fluid as necessary (Ref. TASK 12-12-29-611-001) or (Ref. TASK 12-12-29-611-002).
(3)
Make sure that the air pressure in the reservoir of the Yellow hydraulic system is not less than 50 psi (3.4473 bar). If necessary pressurize the reservoir (Ref. TASK 29-14-00-614-002).
Subtask 29-00-00-410-066
B. Close Access
(1)
Make sure that the work area is clean and clear of tool(s) and other items.
(2)
Close the main doors of the main landing gear (Ref. TASK 32-12-00-410-001).
1EFF : ALL 1 29-00-00Page 227 1 1 May 01/04R 1 1 1CES 1
TASK 29-00-00-870-006
Bleeding Procedure of the Yellow Hydraulic System Upstream of the Yellow E-Pump
WARNING : PUT THE SAFETY DEVICES AND THE WARNING NOTICES IN POSITION BEFORE YOU
_______
START A TASK ON OR NEAR:
-
THE FLIGHT CONTROLS
-
THE FLIGHT CONTROL SURFACES
-
THE LANDING GEAR AND THE RELATED DOORS
-COMPONENTS THAT MOVE.
WARNING : MAKE SURE THAT THE TRAVEL RANGES OF THE FLIGHT CONTROLS ARE CLEAR.
_______
MOVEMENT OF FLIGHT CONTROLS CAN CAUSE INJURY TO PERSONS AND/OR
DAMAGE.
1. Reason for the Job
__________________
Do this procedure after maintenance of the Yellow hydraulic system upstream of the Yellow E-pump.
2. Job Set-up Information
______________________
A. Fixtures, Tools, Test and Support Equipment
-------------------------------------------------------------------------------REFERENCE QTY DESIGNATION -------------------------------------------------------------------------------
No specific Torque Wrench : range 0.20 to 3.60 m.daN
(2.00 to 26.00 lbf.ft)
B. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
12-12-29-611-001 Fill the Hydraulic Fluid Reservoir with a Hand Pump 12-12-29-611-002 Fill the Hydraulic Fluid Reservoir with a Hydraulic
Service Cart 29-00-00-910-002 Safety Procedures of the Hydraulic System 29-14-00-614-001 Depressurization of the Hydraulic Reservoirs 29-14-00-614-002 Pressurization of the Hydraulic Reservoirs through
the Ground Connector R 29-00-00-870-004 Bleeding Procedure of the Yellow Hydraulic System R Upstream of the Engine Pump (for corrective action)
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