4. Procedure_________
Subtask 29-00-00-870-050
A. Bleeding Procedure of the Green Hydraulic System Upstream of the Engine Pump
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.
R (1) Put a container under the engine pump.
(2) Loosen the nut of the case drain hose 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 to between 260 and 320 lbf.in (2.93 and 3.61 m.daN).
(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 PTU (Ref. TASK 29-00-00-870-002) - do the bleeding procedure of the Green hydraulic system downstream of the engine pump (Ref. TASK 29-00-00-870-003).
(6) Remove the container.
(7) Pressurize the reservoir (Ref. TASK 29-14-00-614-002).
(8) Make sure that the level of the hydraulic fluid in the reservoir of the Green hydraulic system is correct. Add fluid as necessary (Ref. TASK 12-12-29-611-001) or (Ref. TASK 12-12-29-611-002).
5. Close-up________
Subtask 29-00-00-410-058
A. Close Access
(1) Make sure that the work area is clean and clear of tool(s) and other items.
(2) Close the left fan cowl door (Ref. TASK 71-13-00-410-040).
Subtask 29-00-00-865-059
B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s): 1701GK, 3701GD.
TASK 29-00-00-870-002
Bleeding Procedure of the Green Hydraulic System Upstream of the PTU
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.
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