-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
29-11-42-000-001 Removal of the Green Power Accumulator 29-11-42-400-001 Installation of the Green Power Accumulator 29-12-21-000-001 Removal of the Accumulator-Air Pressure Gage (2072GM) 29-12-21-400-001 Installation of the Accumulator-Air Pressure Gage
(2072GM) 29-12-42-000-001 Removal of the Blue Power Accumulator 29-12-42-400-001 Installation of the Blue Power Accumulator 29-13-21-000-001 Removal of the Accumulator-Air Pressure Gage (3072GM) 29-13-21-400-001 Installation of the Accumulator-Air Pressure Gage
(3072GM)
29-13-42-000-001 Removal of the Yellow Power Accumulator
29-13-42-400-001 Installation of the Yellow Power Accumulator
32-12-00-010-001 Open the Main Gear Doors for Access
32-12-00-410-001 Close the Main Gear Doors after Access
R 29-10-00-991-010 Fig. 601
3. Job Set-up
__________
Subtask 29-10-00-860-070
A. Aircraft Maintenance Configuration
(1)
Make sure that the hydraulic systems are depressurized and put them in the maintenance configuration. (Ref. TASK 29-00-00-864-001).
(2)
Put the warning notice(s) in position to tell persons not to pressurize the Green, Blue and Yellow hydraulic systems: -in the flight compartment on the hydraulic section of the overhead panel 40VU -on the ground service panels of the Green, Blue and Yellow hydraulic systems.
Subtask 29-10-00-865-070
B. Open, safety and tag this(these) circuit breaker(s):
-------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------
49VU HYD/HYD PWR/B WARN/& CTL 2702GJ C12
121VU HYDRAULIC/HYD POWER/Y 3803GX N30
123VU B HYD/ELEC PUMP 2701GJ AB09
123VU Y HYD/ELEC/PUMP 3802GX AB06
123VU Y HYD/ELEC/ELEC PUMP/NORM 3801GX AB03
Subtask 29-10-00-010-068
C. Get Access
(1) Open the access panels 195BB and 196BB.
(2) Open one main door of the main landing gear (Ref. TASK 32-12-00-010-001).
NOTE : You can open any door, but access is better from the RH side.
____
4. Procedure
_________
Subtask 29-10-00-210-057
A. Do a Check of the Nitrogen Charge Pressure of the Green, Blue and Yellow System Accumulators
(1) Refer to the nitrogen pressure gages (1072GM), (2072GM) and (3072GM)
on each of the system accumulators and make sure that the precharge R pressure is as follows: R (Ref. Fig. 601/TASK 29-10-00-991-010)
deg.C deg.F "P" bar "P" psi
-----------------------------------------------------------20 -4 108 1570 -10 + 14 112 1620
0 + 32 118 1710
+10 + 50 124 1800
+20 + 68 130 1890
+30 + 86 136 1970
+40 +104 142 2060
+50 +122 147 2130
+60 +140 153 2220
R R Pressure Value Figure 601/TASK 29-10-00-991-010
1EFF : 1 1 1CES ALL 1 111 29-10-00 Page 611 Feb 01/05
R R (2) If the accumulator pressure is in the given limits, no more action is necessary.
(3) If the accumulator pressure is more than the correct pressure "P", or if the pressure is between "P" and "P" minus 15 bar (217.5565 psi):
R (a) Adjust the accumulator pressure as necessary (Ref. TASK 12-14-29-614-001).
R R (4) If the accumulator pressure is "p" minus more than 15 bar (217.5565 psi), do the worksteps that follow:
R R (a) Adjust the accumulator pressure to the correct value "P" plus 15 bar (217.5565 psi) (Ref. TASK 12-14-29-614-001).
(b) After 20 minutes, do a check of the accumulator pressure:
1_ If the accumulator pressure is correct to the value "P", plus/minus 7 bar (101.5263 psi): - no more action is necessary.
2_ If the accumulator pressure is 7 bar (101.5263 psi) or more above the correct value "P": - reduce the accumulator pressure to the correct value "P".
R R 3_ If the accumulator pressure is "p" minus more than 7 bar(101.5263 psi), do this workstep: - do a leak check with the oxygen leak detector SPECIAL MATERIALS (Material No. 05-004) on the gas manifold of the accumulator.
(c) If possible, stop the leaks and pressurize the accumulator (Ref. TASK 12-14-29-614-001).
(d) If it is not possible to stop the leaks, replace the accumulator, gage, charging valve or manifold as necessary - Green hydraulic system (Ref. TASK 29-11-42-000-001) / (Ref. TASK 29-11-42-400-001) / (Ref. TASK 29-11-21-000-001) / (Ref. TASK 29-11-21-400-001). - Blue hydraulic system (Ref. TASK 29-12-42-000-001) / (Ref. TASK 29-12-42-400-001) / (Ref. TASK 29-12-21-000-001) / (Ref. TASK 29-12-21-400-001). - Yellow hydraulic system (Ref. TASK 29-13-42-000-001) / (Ref. TASK 29-13-42-400-001) / (Ref. TASK 29-13-21-000-001) / (Ref. TASK 29-13-21-400-001).
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