Installation of the Yellow Power Accumulator

TASK 29-13-42-400-001-A
Installation of the Yellow 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.

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.

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

FIN: 3070GM

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	CONTAINER - HYDRAULIC FLUID RESISTANT
No specific	2	WARNING NOTICE(S)
No specific	Torque wrench: range to between 1.19 and 1.08 m.daN (105.31 and 95.58 lbf.in )
No specific	Torque wrench: range to between 1.7 and 1.5 m.daN (12.54 and 11.06 lbf.ft )
No specific	Torque wrench: range to between 3.44 and 3.34 m.daN (25.37 and 24.63 lbf.ft )
No specific	Torque wrench: range to between 6.827 and 6.258 m.daN (50.35 and 46.15 lbf.ft )
No specific	Torque wrench: range to between 10.7 and 9.7 m.daN (78.91 and 71.53 lbf.ft )
No specific	Torque wrench: range to between 14.24 and 14.0 m.daN (105.01 and 103.24 lbf.ft )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.02ABA1)	Phosphate Ester Hydraulic Fluid-General Power - -
No specific	lockwire, corrosion resistant steel 0.8 mm (0.032in.)

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
196BB

D. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
9	O-RINGS	AIPC 29-13-03-06-160
4	O-RINGS	AIPC 29-13-03-06-190
9	O-RINGS	AIPC 29-13-83-08-290
4	O-RINGS	AIPC 29-13-83-08-310

E. Referenced Information

REFERENCE	DESIGNATION
TASK 12-12-29-611-001-A	Fill the Hydraulic Fluid Reservoir with a Hand Pump
TASK 12-14-29-614-001-A	Fill the Hydraulic Power Accumulators with Nitrogen
TASK 29-00-00-864-001-A	Put the Related Hydraulic System in the Depressurized Configuration before Maintenance Action
TASK 29-00-00-870-007-A	Bleeding Procedure of the Yellow Hydraulic System Downstream of the Engine Pump
TASK 29-00-00-910-002-A	Safety Procedures of the Hydraulic System
TASK 29-10-00-863-002-A	Pressurize the Yellow Hydraulic System with a Hydraulic Ground Power-Cart
TASK 29-10-00-864-002-A	Depressurize the Yellow 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)
TASK 29-23-00-860-001-A	Disconnection of the Isolation Coupling of the Power Transfer Unit (PTU)
TASK 29-23-00-860-002-A	Connection of the Isolation Coupling of the Power Transfer Unit (PTU)
Yellow Power Accumulator

3. Job Set-up
Subtask 29-13-42-860-052-A

A. Aircraft Maintenance Configuration

WARNING: OBEY THE HYDRAULIC SAFETY PROCEDURES.

(1) Obey the hydraulic safety procedures (Ref. AMM TASK 29-00-00-910-002).
(2) Make sure that the WARNING NOTICE(S) are 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. AMM TASK 29-00-00-864-001).
(4) Make sure that the reservoir of the Yellow hydraulic system is depressurized (Ref. AMM TASK 29-14-00-614-001).
(5) Make sure that the access door 196BB is open.
(6) Make sure that the CONTAINER - HYDRAULIC FLUID RESISTANT is in position below the location of the Yellow power accumulator.
(7) Make sure that the isolation coupling of the Power Transfer Unit (PTU) is disconnected (Ref. AMM TASK 29-23-00-860-001).

Subtask 29-13-42-865-051-A

B. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
49VU	HYD/HYD PWR/B WARN/& CTL	2702GJ	C12
** ON A/C NOT FOR ALL
121VU	HYDRAULIC/HYD POWER/Y	3803GX	N30
** ON A/C NOT FOR ALL
121VU	HYDRAULIC/HYD POWER/Y	3803GX	N31
** ON A/C ALL
123VU	B HYD/ELEC PUMP	2701GJ	AB09
123VU	Y HYD/ELEC/PUMP	3802GX	AB06
123VU	Y HYD/ELEC/ELEC PUMP/NORM	3801GX	AB03

4. Procedure
Subtask 29-13-42-560-050-A ** ON A/C NOT FOR ALL

A. Preparation of the Replacement Component

WARNING: USE PROTECTIVE GOGGLES AND GLOVES WHEN YOU REMOVE OR INSTALL LOCKWIRE. EACH TIME YOU CUT LOCKWIRE, REMOVE AND DISCARD IT IMMEDIATELY. LOOSE LOCKWIRE CAN CUT YOU OR MAKE YOU BLIND, AND/OR CAN CAUSE DAMAGE.

(1) Remove the parts which are attached to the removed accumulator (8) as follows:
(a) Remove the union (3) and the O-ring (4).
(b) Remove and discard the lockwire from the adapter (10).
(c) Remove the adapter (10) together with the charging valve (12) and the pressure gage (11).
(d) Remove the O-ring (9) from the accumulator (8).
(e) Discard the O-rings (4) and (9).
(2) Install the removed parts on the replacement accumulator as follows:
(a) Remove the blanking caps from the accumulator (8).
(b) Clean the union and the adapter and make sure that they are in good condition.
(c) Lubricate the new AIPC 29-13-03-06-190 O-RINGS (4) or AIPC 29-13-83-08-310 O-RINGS (4) and the new AIPC 29-13-03-06-160 O-RINGS (9) or AIPC 29-13-83-08-290 O-RINGS (9) and all threads with Phosphate Ester Hydraulic Fluid-General Power - - (Material No.02ABA1) .
(d) Install the new O-ring (4) on the removed union (3).
(e) Install the union (3) and TORQUE it to between 6.827 and 6.258 m.daN (50.35 and 46.15 lbf.ft )

.
(f) Install the new O-ring (9) on the removed adapter (10).
(g) Install the adapter (10) together with the pressure gage (11) and the air charging valve (12).
(h) TORQUE the adapter (10) to between 1.19 and 1.08 m.daN (105.31 and 95.58 lbf.in )

.
(i) Safety the adapter (10) with lockwire, corrosion resistant steel 0.8 mm (0.032in.).

Subtask 29-13-42-560-050-B ** ON A/C NOT FOR ALL

A. Preparation of the Replacement Component

.
(i) TORQUE the pressure gage (11) to between 1.7 and 1.5 m.daN (12.54 and 11.06 lbf.ft )

.
(j) TORQUE the charging valve (12) to between 3.44 and 3.34 m.daN (25.37 and 24.63 lbf.ft )

.
(k) Safety the adapter (10) with lockwire, corrosion resistant steel 0.8 mm (0.032in.).

Subtask 29-13-42-420-050-A

B. Installation 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 DO NOT USE THE SECOND WRENCH, THERE IS A RISK THAT YOU WILL LOOSEN OR TIGHTEN THE UNION TOO MUCH.

CAUTION: YOU MUST INSTALL HYDRAULIC TUBES WITH HYDRAULIC FLUID AS LUBRICANT.

(1) Clean the component interfaces and the adjacent area.
(2) Do an inspection of the component interfaces and the adjacent area.
(3) Remove all blanking caps.
(4) Put the accumulator assembly in its mounting and install the nut (2).

NOTE: Install the accumulator assembly so that you can easily read the pressure gage and you have good access to the charging valve.

(5) Install the clamps (5) and tighten the screws.
(6) Make sure that the hydraulic line end-fitting is serviceable.
(7) Apply Phosphate Ester Hydraulic Fluid-General Power - - (Material No.02ABA1) to the thread of the line end-fitting.
(8) Install the hydraulic line free of stress with the end-fitting (1) on the union (3).
(9) TORQUE the end-fitting (1) to between 10.7 and 9.7 m.daN (78.91 and 71.53 lbf.ft )

Subtask 29-13-42-790-050-A

C. Test
(1) Fill the accumulator with nitrogen (Ref. AMM TASK 12-14-29-614-001).
(2) Remove the warning notices from the ground service panel of the Yellow hydraulic system and from the cockpit .
(3) Pressurize the reservoir of the Yellow hydraulic system (Ref. AMM TASK 29-14-00-614-002).
(4) Make sure that the fluid level in the reservoir of the Yellow hydraulic system is correct. Add fluid as necessary (Ref. AMM TASK 12-12-29-611-001).
(5) Pressurize the Yellow hydraulic system (Ref. AMM TASK 29-10-00-863-002).
(6) Examine the accumulator connections and sure that there are no hydraulic fluid or nitrogen leaks.
(7) Make sure that the pressure gage shows 3000 +100 -100 psi.
(8) Depressurize the Yellow hydraulic system (Ref. AMM TASK 29-10-00-864-002).
(9) Do the bleeding procedure of the Yellow hydraulic system downstream of the engine pump (Ref. AMM TASK 29-00-00-870-007).

NOTE: When you do the bleeding procedure, nitrogen, which has gone into the hydraulic system from the defective accumulator, is removed.

5. Close-up
Subtask 29-13-42-860-051-A

A. Put the aircraft back to the serviceable condition.
(1) Connect the PTU isolation coupling (Ref. AMM TASK 29-23-00-860-002).
(2) Remove the container from below the accumulator.

Subtask 29-13-42-410-050-A

B. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the access door 196BB.

Subtask 29-13-42-865-052-A

C. 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
** ON A/C NOT FOR ALL
121VU	HYDRAULIC/HYD POWER/Y	3803GX	N30
** ON A/C NOT FOR ALL
121VU	HYDRAULIC/HYD POWER/Y	3803GX	N31
** ON A/C ALL
123VU	B HYD/ELEC PUMP	2701GJ	AB09
123VU	Y HYD/ELEC/PUMP	3802GX	AB06
123VU	Y HYD/ELEC/ELEC PUMP/NORM	3801GX	AB03

[Rev.10 from 2021] 2026.04.01 07:51:09 UTC