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REFERENCE DESIGNATION -------------------------------------------------------------------------------
R R R R 29-00-00-870-001 29-00-00-870-003 Bleeding Procedure of the Green Hydraulic System Upstream of the Engine Pump (for corrective action) Bleeding Procedure of the Green Hydraulic System Downstream of the Engine Pump (for corrective action)
3. Job Set-up__________
Subtask 29-00-00-860-062
A. Aircraft Maintenance Configuration
WARNING : OBEY THE HYDRAULIC SAFETY PROCEDURES._______
(1) Obey the hydraulic safety procedures (Ref. TASK 29-00-00-910-002).
(2) Make sure that the replaced component is correctly installed.
(3) Make sure that the hydraulic reservoir of the Green hydraulic system is pressurized. If necessary pressurize it (Ref. TASK 29-14-00-614-002).
Subtask 29-00-00-010-060
B. Open the main doors of the main landing gear (Ref. TASK 32-12-00-010-001).
4. Procedure_________
Subtask 29-00-00-870-052
A. Bleeding Procedure of the Green Hydraulic System Upstream of the PTU
CAUTION : USE A SECOND WRENCH TO APPLY COUNTERTORQUE TO THE UNION WHEN_______ YOU DISCONNECT/CONNECT HYDRAULIC LINES ON UNIONS. IF YOU USE THE SECOND WRENCH, YOU WILL NOT LOOSEN OR TIGHTEN THE UNION TOO MUCH.
(1) Put a container under the Power Transfer Unit (PTU).
(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 Green 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 (1087GM) 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 Green 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 Green reservoir and record the fluid level.
(e) Depressurize the reservoir of the Green 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 2 liters, do the bleeding procedure again.
R NOTE : Do not do the bleeding procedure more than two times.____
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 Green hydraulic system upstream of the engine pump (Ref. TASK 29-00-00-870-001) - do the bleeding procedure of the Green hydraulic system downstream of the engine pump (Ref. TASK 29-00-00-870-003).
5. Close-up
________ Subtask 29-00-00-860-075
A. Put the aircraft back to the serviceable condition.
(1)
Remove the container.
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