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REFERENCE DESIGNATION -------------------------------------------------------------------------------
R R R R R R 71-13-00-410-040 29-00-00-870-005 29-00-00-870-006 29-00-00-870-007 Closing of the Fan Cowl Doors Bleeding Procedure of the Yellow Hydraulic System Upstream of the PTU (for corrective action) Bleeding Procedure of the Yellow Hydraulic System Upstream of the Yellow E-Pump (for corrective action) Bleeding Procedure of the Yellow Hydraulic System Downstream of the Engine Pump (for corrective action)
3. Job Set-up__________
Subtask 29-00-00-860-064
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 Yellow hydraulic system is pressurized. If necessary pressurize it (Ref. TASK 29-14-00-614-002).
Subtask 29-00-00-865-070
B. Open, safety and tag this(these) circuit breaker(s):
-------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------121VU HYDRAULIC/Y HYD/PUMP ENG2/CTL 3701GD Q36 121VU HYDRAULIC/G HYD/PUMP ENG1/CTL 1701GK R35
Subtask 29-00-00-010-063
C. Open the left fan cowl door (Ref. TASK 71-13-00-010-040).
4. Procedure
_________
Subtask 29-00-00-870-059
A. Bleeding Procedure of the Yellow 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.
(1)
Put a container under the engine pump.
(2)
Loosen the nut of the case drain hose so that the air (or the 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 Yellow reservoir.
(b)
If it is necessary to add fluid: 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 the 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.____
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