Deactivation of the Blue Power Accumulator

TASK 29-10-00-040-005-A
Deactivation of the Blue Power Accumulator

WARNING: MAKE SURE THAT THE GROUND SAFETY-LOCKS ARE IN POSITION ON THE LANDING GEAR. THIS WILL PREVENT UNWANTED MOVEMENT OF THE LANDING GEAR, AND THUS POSSIBLE INJURY TO PERSONS AND DAMAGE TO THE AIRCRAFT AND/OR EQUIPMENT.

FIN: 2070GM
Task Summary

Access	Test	Specific Tools	Mhr	E/T	Nb Men
YES	NO	NO	1.5	1.5	1

1. Reason for the Job
MMEL 29-10-04A
HYDRAULIC SYSTEM ACCUMULATOR
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	CAP - BLANKING
No specific	AR	CAP - BLANKING (ABS0946V10 TYPE)
OR	OR
No specific	AR	CAP - BLANKING (MS21914-10 TYPE)
No specific	AR	CONTAINER 5 L (1.32 USGAL)
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	1	WARNING NOTICE(S)
No specific	Torque wrench: range to between 8.3 and 7.5 m.daN (61.21 and 55.31 lbf.ft )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.02ABA1)	Phosphate Ester Hydraulic Fluid-General Power - -
(Material No.03LDA1)	Grease-Hydraulic Systems - -

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
195BB

D. Referenced Information

REFERENCE	DESIGNATION
TASK 12-12-29-611-001-A	Fill the Hydraulic Fluid Reservoir with a Hand Pump
TASK 29-00-00-864-001-A	Put the Related Hydraulic System in the Depressurized Configuration before Maintenance Action
TASK 29-00-00-870-009-A	Bleeding Procedure of the Blue Hydraulic System Downstream of the Blue E-Pump
TASK 29-00-00-910-002-A	Safety Procedures of the Hydraulic System
TASK 29-10-00-863-003-A	Pressurize the Blue Hydraulic System with a Hydraulic Ground Power-Cart
TASK 29-10-00-863-003-A-01	Pressurize the Blue Hydraulic System with the Blue Electric Pump
TASK 29-10-00-864-003-A	Depressurize the Blue Hydraulic System
TASK 29-14-00-614-001-A	Depressurization of the Hydraulic Reservoirs
TASK 29-14-00-614-002-A	Pressurization of the Hydraulic Reservoirs through the Ground Connector
TASK 29-14-00-614-002-A-01	Pressurization of the Hydraulic Reservoirs with the Auxiliary Power Unit (APU)
Blue Power Accumulator (2070GM) ** ON A/C NOT FOR ALL
Blue Power Accumulator (2070GM) ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 29-10-00-865-087-A

A. Open, safety and tag this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
49VU	HYD/HYD PWR/B WARN/& CTL	2702GJ	C12
123VU	B HYD/ELEC PUMP	2701GJ	AB09

Subtask 29-10-00-860-103-A ** ON A/C NOT FOR ALL

B. Aircraft Maintenance Configuration

WARNING: OBEY THE HYDRAULIC SAFETY PROCEDURES.

(1) Obey the hydraulic safety procedures (Ref. AMM TASK 29-00-00-910-002).
(2) Put the WARNING NOTICE(S) in position to tell persons not to pressurize the Blue hydraulic system:

in the cockpit on the hydraulic section 40VU of the overhead panel
on the ground service panel of the Blue hydraulic system.

(3) Make sure that the Blue hydraulic system is depressurized and put it in the maintenance configuration.
(Ref. AMM TASK 29-00-00-864-001).
(4) Depressurize the reservoir of the Blue hydraulic system (Ref. AMM TASK 29-14-00-614-001).
(5) Put a CONTAINER 5 L (1.32 USGAL) below the power accumulator to collect the unwanted hydraulic fluid.

Subtask 29-10-00-860-103-B ** ON A/C NOT FOR ALL

B. Aircraft Maintenance Configuration

WARNING: OBEY THE HYDRAULIC SAFETY PROCEDURES.

(1) Obey the hydraulic safety procedures (Ref. AMM TASK 29-00-00-910-002).
(2) Put the WARNING NOTICE(S) in position to tell persons not to pressurize the Blue hydraulic system:

in the cockpit on the hydraulic section 40VU of the overhead panel
on the ground service panel of the Blue hydraulic system.

(3) Make sure that the Blue hydraulic system is depressurized and put it in the maintenance configuration (Ref. AMM TASK 29-00-00-864-001).
(4) Depressurize the reservoir of the Blue hydraulic system (Ref. AMM TASK 29-14-00-614-001).
(5) Put a CONTAINER 5 L (1.32 USGAL) below the power accumulator to collect the unwanted hydraulic fluid.
(6) Put a CONTAINER 5 L (1.32 USGAL) below the HP manifold to collect the unwanted hydraulic fluid.

Subtask 29-10-00-010-078-A

C. Open the access door 195BB.

4. Procedure
Subtask 29-10-00-614-052-A ** ON A/C NOT FOR ALL

A. Release the nitrogen pressure from the power accumulator (13) as follows:
(1) Remove the end cap (15) from the charging valve.
(2) Turn the nut (14) to release the nitrogen pressure.
(3) When the nitrogen pressure is fully released turn the nut (14) to close the charging valve.
(4) Install the end cap (15) on the charging valve.

Subtask 29-10-00-020-058-A ** ON A/C NOT FOR ALL

B. Removal of the Hydraulic Pipe

CAUTION: USE A SECOND WRENCH TO APPLY COUNTERTORQUE TO THE UNION WHEN YOU DISCONNECT/CONNECT HYDRAULIC LINES ON UNIONS. IF YOU DO NOT USE THE SECOND WRENCH, THERE IS A RISK THAT YOU WILL LOOSEN OR TIGHTEN THE UNION TOO MUCH.

(1) Disconnect the line end fitting (1) from the union (2) of the tee connector (3) installed at the ground leakage measurement manifold (4).
(2) Disconnect the line end fitting (11) from the bulkhead union (12) of the power accumulator (13).
(3) Remove the nut (8), bolt (9), spacer (6) and pipe (10) with the clamp (7).
(4) Install the CAP - BLANKING on the line end fittings (1) and (11) of the removed pipe (10).

Subtask 29-10-00-420-055-A ** ON A/C NOT FOR ALL

C. Installation of the Blanking Caps

(1) Apply the Phosphate Ester Hydraulic Fluid-General Power - - (Material No.02ABA1) or Grease-Hydraulic Systems - - (Material No.03LDA1) to the threads of the union (2) and the bulkhead union (12) and the rear of the insert collar of the blanking caps.
(2) Install the CAP - BLANKING (MS21914-10 TYPE)CAP - BLANKING (ABS0946V10 TYPE) on the union (2) and the bulkhead union (12).
(3) TORQUE the blanking caps to between 8.3 and 7.5 m.daN (61.21 and 55.31 lbf.ft )

Subtask 29-10-00-614-052-B ** ON A/C NOT FOR ALL

D. Release the nitrogen pressure from the power accumulator (12) as follows:
(1) Remove the end cap (14) from the charging valve.
(2) Turn the nut (13) to release the nitrogen pressure.
(3) When the nitrogen pressure is fully released turn the nut (13) to close the charging valve.
(4) Install the end cap (14) on the charging valve.

Subtask 29-10-00-020-058-B ** ON A/C NOT FOR ALL

E. Removal of the Hydraulic Pipe

(1) Disconnect the line end fitting (2) from the union (15) of the tee connector (1) installed at the HP manifold (3).
(2) Disconnect the line end fitting (10) from the bulkhead union (11) of the power accumulator (12).
(3) Remove the bolt (8), washer (7), spacer (5) and pipe (9) with the clamp (6).
(4) Install the CAP - BLANKING on the line end fittings (2) and (10) of the removed pipe (9).

Subtask 29-10-00-420-055-B ** ON A/C NOT FOR ALL

F. Installation of the Blanking Caps

(1) Apply the Phosphate Ester Hydraulic Fluid-General Power - - (Material No.02ABA1) or Grease-Hydraulic Systems - - (Material No.03LDA1) to the threads of the union (2) and the bulkhead union (12) and the rear of the insert collar of the blanking caps.
(2) Install the CAP - BLANKING (MS21914-10 TYPE)CAP - BLANKING (ABS0946V10 TYPE) on the union (15) and the bulkhead union (11).
(3) TORQUE the blanking caps to between 8.3 and 7.5 m.daN (61.21 and 55.31 lbf.ft )

Subtask 29-10-00-865-088-A

G. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
49VU	HYD/HYD PWR/B WARN/& CTL	2702GJ	C12
123VU	B HYD/ELEC PUMP	2701GJ	AB09

Subtask 29-10-00-790-055-A ** ON A/C NOT FOR ALL

H. Leak Test

WARNING: MAKE SURE THAT THE TRAVEL RANGES OF THE FLIGHT CONTROLS SURFACES ARE CLEAR. MOVEMENT OF FLIGHT CONTROLS CAN CAUSE INJURY TO PERSONS AND/OR DAMAGE TO EQUIPMENT.

(1) Pressurize the hydraulic reservoir of the Blue hydraulic system (Ref. AMM TASK 29-14-00-614-002).
(2) Pressurize the Blue hydraulic system (Ref. AMM TASK 29-10-00-863-003).
(3) After 5 minutes, examine the connection of the blanking cap to the union (2) of the tee connector (3) installed at the ground leakage measurement manifold (4). Make sure that there is no leakage.
(4) Depressurize the Blue hydraulic system
(Ref. AMM TASK 29-10-00-864-003).
(5) Do the bleeding procedure of the Blue hydraulic system downstream of the Blue E-pump (Ref. AMM TASK 29-00-00-870-009).

NOTE: When you do the bleeding procedure, you remove the nitrogen which came into the hydraulic system from the defective accumulator.

Subtask 29-10-00-790-055-B ** ON A/C NOT FOR ALL

H. Leak Test

WARNING: MAKE SURE THAT THE TRAVEL RANGES OF THE FLIGHT CONTROLS SURFACES ARE CLEAR. MOVEMENT OF FLIGHT CONTROLS CAN CAUSE INJURY TO PERSONS AND/OR DAMAGE TO EQUIPMENT.

(1) Pressurize the hydraulic reservoir of the Blue hydraulic system (Ref. AMM TASK 29-14-00-614-002).
(2) Pressurize the Blue hydraulic system (Ref. AMM TASK 29-10-00-863-003).
(3) After 5 minutes, examine the connection of the blanking cap to the union (15) of the tee connector (1) installed at the HP manifold (3). Make sure that there is no leakage.
(4) Depressurize the Blue hydraulic system
(Ref. AMM TASK 29-10-00-864-003).
(5) Do the bleeding procedure of the Blue hydraulic system downstream of the Blue E-pump (Ref. AMM TASK 29-00-00-870-009).

NOTE: When you do the bleeding procedure, you remove the nitrogen which came into the hydraulic system from the defective accumulator.

5. Close-up
Subtask 29-10-00-410-078-A ** ON A/C NOT FOR ALL

A. Put the aircraft back to the serviceable condition.
(1) Make sure that the fluid level in the reservoir of the Blue hydraulic is correct. Add fluid as necessary (Ref. AMM TASK 12-12-29-611-001).
(2) Remove the CONTAINER 5 L (1.32 USGAL) from below the power accumulator.
(3) Make sure that the work area is clean and clear of tools and other items.
(4) Close the access door 195BB.
(5) Remove the WARNING NOTICE(S).
(6) Make an entry in the logbook.

Subtask 29-10-00-410-078-B ** ON A/C NOT FOR ALL

A. Put the aircraft back to the serviceable condition.
(1) Make sure that the fluid level in the reservoir of the Blue hydraulic is correct. Add fluid as necessary (Ref. AMM TASK 12-12-29-611-001).
(2) Remove the CONTAINER 5 L (1.32 USGAL) from below the power accumulator.
(3) Remove the CONTAINER 5 L (1.32 USGAL) from below the HP manifold.
(4) Make sure that the work area is clean and clear of tools and other items.
(5) Close the access door 195BB.
(6) Remove the WARNING NOTICE(S).
(7) Make an entry in the logbook.

[Rev.10 from 2021] 2026.04.02 06:18:24 UTC