(2)
De-energize the aircraft electrical circuits
(Ref. TASK 24-41-00-862-002).
(3)
Connect the isolation coupling of the Power Transfer Unit (PTU) (Ref. TASK 29-23-00-860-002).
(4)
Remove the warning notice(s). Subtask 29-13-41-410-053
B.
Close Access
(1)
Make sure that the work area is clean and clear of tool(s) and other items.
(2)
Close the access door 196BB.
Subtask 29-13-41-865-067
C. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s): 3801GX, 3802GX, 3803GX.
ACCUMULATOR - YELLOW POWER (3070GM) - REMOVAL/INSTALLATION
__________________________________________________________
TASK 29-13-42-000-001
Removal of the Yellow Power Accumulator
WARNING : MAKE SURE THAT THE GROUND SAFETY-LOCKS ARE IN POSITION ON THE LANDING
_______ GEAR.
1. Reason for the Job
__________________
Self Explanatory
2. Job Set-up Information
______________________
A. Fixtures, Tools, Test and Support Equipment
-------------------------------------------------------------------------------REFERENCE QTY DESIGNATION -------------------------------------------------------------------------------
No specific blanking caps No specific circuit breaker(s) safety clip(s) No specific container No specific warning notices
B. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
29-00-00-864-001 Put the Related Hydraulic System in the Depressurized
Configuration before Maintenance Action 29-00-00-910-002 Safety Procedures of the Hydraulic System 29-14-00-614-001 Depressurization of the Hydraulic Reservoirs 29-23-00-860-001 Disconnection of the Isolation Coupling of the Power
Transfer Unit (PTU) 29-13-42-991-001 Fig. 401
3. Job Set-up
__________
Subtask 29-13-42-865-050
A. 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
R 123VU Y HYD/ELEC/ELEC PUMP/NORM 3801GX AB03
Subtask 29-13-42-010-050
B. Open the access door 196BB.
Subtask 29-13-42-860-050
C. Aircraft Maintenance Configuration
WARNING : OBEY THE HYDRAULIC SAFETY PROCEDURES.
_______
(1)
Obey the hydraulic safety procedures (Ref. TASK 29-00-00-910-002).
(2)
Put the warning notices in position to tell persons not to pressurize the Yellow hydraulic system:
-in the cockpit on the hydraulic section 40VU of the overhead panel, - on the ground service panel of the Yellow hydraulic system.
(3)
Make sure that the Yellow hydraulic system is depressurized and put it in the maintenance configuration. (Ref. TASK 29-00-00-864-001).
(4)
Depressurize the reservoir of the Yellow hydraulic system (Ref. TASK 29-14-00-614-001).
(5)
Disconnect the isolation coupling of the Power Transfer Unit (PTU) (Ref. TASK 29-23-00-860-001).
(6)
Put a container below the accumulator to collect unwanted hydraulic fluid.
Subtask 29-13-42-614-051
D. Release the nitrogen pressure from the accumulator as follows:
(1)
Remove the endcap from the charging valve (12).
(2)
Turn the nut to the OPEN position and release the nitrogen pressure.
4. Procedure
_________ (Ref. Fig. 401/TASK 29-13-42-991-001) Subtask 29-13-42-020-050
A. Removal of the Power Accumulator 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)
Loosen the end-fitting (1) and disconnect the hydraulic line from the union (3).
(2)
Remove the nut (2) from the union (3).
(3)
Hold the accumulator assembly, loosen the two clamp screws and remove the two clamps (5).
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