Functional Check of ACT Pressure Reducing Valve

TASK 28-28-00-720-001-A
Functional Check of ACT Pressure Reducing Valve

WARNING: OBEY THE FUEL SAFETY PROCEDURES.

FIN: 171QM ** ON A/C NOT FOR ALL

1. Reason for the Job
Refer to the MPD TASK: 282800-07
FUNCTIONAL CHECK OF ACT PRESSURE REDUCING VALVE
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	AIR SOURCE 2 BAR (30 PSI) - REGULATED, FILTERED, DRY
No specific	1	GAGE 5 BAR (75 PSI) - PRESSURE
No specific	AR	PLUG - BLANKING
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	AR	WARNING NOTICE(S)
98D28108658000	1	TOOL-PRESSURE TEST,ACT
99D28108418000	1	ACT VALVE CONTROL BOX

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
151CC, 151GC
151NC, 195BB, 231JH, 252HF
252CG
151BC

C. Referenced Information

REFERENCE	DESIGNATION
TASK 24-41-00-862-002-A	De-energize the Aircraft Electrical Circuits Supplied from the External Power
TASK 24-41-00-862-002-A-01	De-energize the Aircraft Electrical Circuits Supplied from the APU
TASK 24-41-00-862-002-A-02	De-energize the Aircraft Electrical Circuits Supplied from the Engine 1(2)
TASK 24-42-00-861-001-A	Energize the Ground Service Network from the External Power
TASK 25-55-11-000-002-A	Removal of the Ceiling Panels in the Aft Cargo-Compartment - FR47/FR59
TASK 25-55-11-000-003-A	Removal of the Sidewall Panels in the Aft Cargo Compartment - FR47/FR59
TASK 25-55-11-400-002-A	Installation of the Ceiling Panels in the Aft Cargo-Compartment - FR47/FR59
TASK 25-55-11-400-003-A	Installation of the Sidewall Panels in the Aft Cargo Compartment - FR47/FR59
TASK 28-00-00-910-001-A	Fuel Safety Procedures
TASK 28-11-49-000-001-A	Removal of the ACT Integrated Impact Wall
TASK 28-11-49-400-001-A	Installation of the ACT Integrated Impact Wall
TASK 28-25-00-650-001-A	Pressure Defuel
TASK 33-14-00-710-001-A	Operational Check of the Light Test System
TASK 52-30-00-860-001-A	Open the FWD or Aft Cargo-Compartment Door with the Yellow Electric Pump
TASK 52-30-00-860-002-A	Close the FWD or Aft Cargo-Compartment Door with the Yellow Electric Pump
TASK 53-22-12-000-001-A	Removal of the Cabin Floor Panels
TASK 53-22-12-400-001-A	Installation of the Cabin Floor Panels
TASK 53-42-12-000-001-A	Removal of the Cabin Floor Panels from FR47 thru FR64
TASK 53-42-12-400-001-A	Installation of the Cabin Floor Panels from FR47 thru FR64
Access to Test Points T1 and T2 ** ON A/C NOT FOR ALL
Access to Test Ports T1 and T2 ** ON A/C NOT FOR ALL
ACT Pressure Reducing Valve - Test Connections ** ON A/C NOT FOR ALL
ACT Pressure Reducing Valve - Test Connections ** ON A/C NOT FOR ALL
Test Tool Arrangement ACT
ACT Valve Control Box ** ON A/C NOT FOR ALL
ACT Pressure Reducing Valve - Test Connections ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 28-28-00-860-055-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Obey the fuel safety procedures (Ref. AMM TASK 28-00-00-910-001).
(2) Energize the ground service network
(Ref. AMM TASK 24-42-00-861-001).
(3) Defuel all Additional Center Tanks (ACTs) (Ref. AMM TASK 28-25-00-650-001).
(4) Put a WARNING NOTICE(S) in position on these panels to tell persons not to operate the refuel/defuel system:

Refuel/defuel panel 800VU/801VU
HYD/Fuel panel 40VU
ACT control panel 28VU.

Subtask 28-28-00-010-097-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Open the aft cargo-compartment door (Ref. AMM TASK 52-30-00-860-001).
(a) Remove the right impact wall from the ACT (Ref. AMM TASK 28-11-49-000-001) to get access to the pressure tube of the ACT.
(b) Remove the applicable ceiling panel 151GC 151CC 151BC (Ref. AMM D/O 25-55-11-00) to get access to the ACT Air Shut-Off Valve Actuator (3QH) and to the test port T1 and T2.

Access to Test Points T1 and T2 ** ON A/C NOT FOR ALL

Subtask 28-28-00-010-097-B ** ON A/C NOT FOR ALL

B. Get Access
(1) Open the aft cargo-compartment door (Ref. AMM TASK 52-30-00-860-001).
(a) Remove the right impact wall from the ACT (Ref. AMM TASK 28-11-49-000-001) to get access to the pressure tube of the ACT2.
(b) Remove the ceiling panel 151BC (Ref. AMM TASK 25-55-11-000-002) to get access to the ACT Air Shut-Off Valve Actuator (3QH) and to the test port T1 and T2.

Access to Test Points T1 and T2 ** ON A/C NOT FOR ALL

(2) In the cabin, remove the cabin floor panel 252CG (Ref. AMM TASK 53-42-12-000-001) and the applicable cargo ceiling panel to get access to the pressure tube of the ACT1.

Subtask 28-28-00-010-097-G ** ON A/C NOT FOR ALL

B. Get Access
(1) Open the aft cargo-compartment door (Ref. AMM TASK 52-30-00-860-001):
(a) Remove sidewall panel 195BB and ceiling panel 151NC (Ref. AMM TASK 25-55-11-000-003) (Ref. AMM TASK 25-55-11-000-002) to get access to test ports T1 and T2.

Access to Test Ports T1 and T2 ** ON A/C NOT FOR ALL

(2) In the cabin:
(a) To get access to the pressure tube of AFT ACT1 in the aft cargo compartment:

Remove cabin floor panel 252HF (Ref. AMM TASK 53-42-12-000-001) and the applicable cargo ceiling panel.

(b) To get access to the pressure tube of the ACT FWD in the forward cargo compartment:

Remove cabin floor panel 231JH (Ref. AMM TASK 53-22-12-000-001) and the applicable cargo ceiling panel.

Subtask 28-28-00-865-052-A ** ON A/C NOT FOR ALL

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
121VU	ACT PUMP SUPPLY	25QH	Q29
** ON A/C NOT FOR ALL
121VU	FUEL/ACT/FUEL PUMP/SPLY	25QH	Q29

4. Procedure
Subtask 28-28-00-860-059-A ** ON A/C NOT FOR ALL

A. Preparation for the Test
(1) In the aft cargo-compartment:
(a) Close the pressurization system of the ACT(s):

ACT Pressure Reducing Valve - Test Connections ** ON A/C NOT FOR ALL

1 Loosen the coupling nut (4) and disconnect the hose (1) from the adapter (2).
2 Put the PLUG-BLANKING in each disconnected line end.

(b) Install the Test Tool on the T1 and T2 test ports:

Test Tool Arrangement ACT ** ON A/C NOT FOR ALL

1 Connect an AIR SOURCE 2 BAR (30 PSI) - REGULATED, FILTERED, DRY pressure maximum to the test port T1.
2 Connect a GAGE 5 BAR (75 PSI) - PRESSURE maximum to the test port T2.

NOTE: This pressure gage must have a fine scale with steps of 0.001 bar (0.0145 psi).

NOTE: You can use the 98D28108658000 TOOL-PRESSURE TEST,ACT as an alternative tool and connect it to the T1 and T2 test ports.

ACT Valve Control Box ** ON A/C NOT FOR ALL

1 Disconnect the connector 3QH-A from the ACT Air Shut-Off Valve Actuator (3QH).
2 Connect the ACT VALVES CONTROL BOX to the ACT Air Shut-Off Valve Actuator (3QH).
3 Connect the second connector of the ACT VALVES CONTROL BOX to the connection-plug 3QH-A.
4 Open the ACT Air Shut-Off Valve (168QM) with the ACT VALVES CONTROL BOX.
5 Make sure that the indication for the ACT Air Shut-Off Valve Actuator (3QH) shows the open position.

Subtask 28-28-00-720-050-B ** ON A/C NOT FOR ALL

WARNING: WHEN YOU USE COMPRESSED AIR:

USE THE CORRECT PROTECTION (FACE SHIELD OR GOGGLES)
DO NOT POINT THE AIRFLOW AT YOURSELF OR OTHER PERSONS.

LOOSE PARTICLES AND/OR HIGH PRESSURE AIR CAN CAUSE INJURY.

B. Test

ACTION	RESULT
1.On the ACT PRESSURE TEST TOOL: pressurize the test port T1 to 0.75 bar (10.8778 psi).	On the pressure gage at the test port T2: the air pressure indication increases to 0.17 +0.05 bar or -0 bar (2.4656 +0.7252 psi or +0.0000 psi), make sure that the air pressure indication is stable at 0.17 +0.05 bar or -0 bar (2.4656 +0.7252 psi or +0.0000 psi).
2.On the ACT PRESSURE TEST TOOL: release the air pressure from the test port T1.	On the pressure gage at the test port T2: the air pressure indication stays at approximately 0.17 bar (2.4656 psi). NOTE: The air pressure at the test port T2 must stay because the check valve 178QM holds the air pressure.

Subtask 28-28-00-860-189-A ** ON A/C NOT FOR ALL

C. Put the system back to the serviceable condition.
(1) In the aft cargo-compartment:
(a) Connect the pressurization system to the applicable ACT(s):
1 Remove the PLUG-BLANKING from each disconnected line end.
2 Clean the component interfaces and the adjacent area.
3 Do an inspection of the component interfaces and the adjacent area.
4 Connect the hose (1) to the ACT and tighten the coupling nut (4).

(b) Remove the ACT PRESSURE TEST TOOL from the test ports T1 and T2.
(c) Make sure that the couplings of ports T1 and T2 are in position fully CLOSED.
(d) Disconnect the ACT VALVES CONTROL BOX from the ACT Air Shut-Off Valve Actuator (3QH) and the connector-plug 3QH-A.
(e) Connect the connector 3QH-A to the ACT Air Shut-Off Valve Actuator (3QH).

Subtask 28-28-00-860-059-C ** ON A/C NOT FOR ALL

D. Preparation for the Test
(1) Close the ACT pressurization system:

ACT Pressure Reducing Valve - Test Connections ** ON A/C NOT FOR ALL

(a) In the forward cargo-compartment, on ACT FWD, loosen the coupling nut (4) and disconnect the hose (1) from the adapter (3).

NOTE: You get access to ACT FWD in the forward cargo-compartment from the cabin.

(b) Put the PLUG-BLANKING in each disconnected line end.
(c) In the cabin, on AFT ACT1, loosen the coupling nut (4) and disconnect the hose (1) from the adapter (3).
(d) Put the PLUG-BLANKING in each disconnected line end.

(2) In the aft cargo-compartment, install the test tool:

Test Tool Arrangement ACT ** ON A/C NOT FOR ALL

(a) Connect an AIR SOURCE 2 BAR (30 PSI) - REGULATED, FILTERED, DRY pressure maximum to the test port T1.
(b) Connect a GAGE 5 BAR (75 PSI) - PRESSURE maximum to the test port T2.

NOTE: This pressure gage has a fine scale with steps of 0.01 bar (0.1450 psi).

NOTE: You can use the 98D28108658000 TOOL-PRESSURE TEST,ACT as an alternative tool and connect it to test ports T1 and T2.

(3) In the cockpit, open the ACT air shutoff-valve (233QM):
(a) Do the operational test of the annunciator-light test system in the cockpit (Ref. AMM TASK 33-14-00-710-001):
1 Make sure that all the lights on ACT control panel 28VU are on during the test.
(b) On ACT control panel 28VU, make sure that the "ACT XFR" rotary switch is in the "OFF" position.
(c) On ACT control panel 28VU, push the "MOD SEL" P/BSW.
(d) Make sure that the "MAN" light in the "MOD SEL" P/BSW is on.

NOTE: The ACT air shutoff-valve (233QM) is open at this time.

Subtask 28-28-00-720-050-C ** ON A/C NOT FOR ALL

WARNING: WHEN YOU USE COMPRESSED AIR:

USE THE CORRECT PROTECTION (FACE SHIELD OR GOGGLES)
DO NOT POINT THE AIRFLOW AT YOURSELF OR OTHER PERSONS.

LOOSE PARTICLES AND/OR HIGH PRESSURE AIR CAN CAUSE INJURY.

E. Test

ACTION	RESULT
1.On the 98D28108658000 TOOL-PRESSURE TEST,ACT: Pressurize test port T1 to 0.68 bar (10 psi).	On the pressure gage at test port T2: The air pressure indication increases to 0.17 +0.05 bar or -0 bar (2 +1 psi or +0 psi). Make sure that the air pressure indication is stable at 0.17 +0.05 bar or -0 bar (2 +1 psi or +0 psi).
2.On the 98D28108658000 TOOL-PRESSURE TEST,ACT: Release the air pressure from test port T1.	On the pressure gage at test port T2: The air pressure indication stays at approximately 0.17 bar (2 psi). NOTE: It is important that the air pressure stays at test port T2 as check valve 178QM holds the air pressure.

Subtask 28-28-00-860-189-C ** ON A/C NOT FOR ALL

F. Put the system back to the serviceable condition.
(1) In the cockpit, close ACT air shutoff-valve (233QM):
(a) On ACT control panel 28VU, push to release the "MOD SEL" P/BSW.
(b) Make sure that the "MAN" light in the "MOD SEL" P/BSW is off.

(2) In the forward cargo-compartment, connect the pressurization system to ACT FWD:
(a) Remove the PLUG-BLANKING from each disconnected line end.
(b) Clean the component interfaces and the adjacent area.
(c) Do an inspection of the component interfaces and the adjacent area.
(d) Connect the hose (1) to the ACT and tighten the coupling nut (4).

(3) In the aft cargo-compartment:
(a) Connect the pressurization system to the applicable ACT(s):
1 Remove the PLUG-BLANKING from each disconnected line end.
2 Clean the component interfaces and the adjacent area.
3 Do an inspection of the component interfaces and the adjacent area.
(b) Remove the test tool from test ports T1 and T2.
(c) Make sure that couplings of ports T1 and T2 are in fully closed position.

5. Close-up
Subtask 28-28-00-410-050-A ** ON A/C NOT FOR ALL

A. Close Access
(1) In the aft cargo-compartment:
(a) Install the right ACT integrated impact wall (Ref. AMM TASK 28-11-49-400-001).
(b) Install the applicable ceiling panels (Ref. AMM TASK 25-55-11-400-002).
(2) Remove the access platform(s).
(3) Close the aft cargo-compartment door (Ref. AMM TASK 52-30-00-860-002).

Subtask 28-28-00-410-050-B ** ON A/C NOT FOR ALL

Subtask 28-28-00-410-050-F ** ON A/C NOT FOR ALL

A. Close Access
(1) In the aft cargo compartment:
(a) Install sidewall panel 195BB and ceiling panel 151NC (Ref. AMM TASK 25-55-11-400-003) (Ref. AMM TASK 25-55-11-400-002).
(2) Remove the access platform(s).
(3) Close the aft cargo-compartment door (Ref. AMM TASK 52-30-00-860-002).
(4) In the cabin:
(a) Install the applicable cargo ceiling panels and cabin floor panels (Ref. AMM TASK 53-22-12-400-001) (Ref. AMM TASK 53-42-12-400-001).

Subtask 28-28-00-865-053-A ** ON A/C NOT FOR ALL

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
121VU	ACT PUMP SUPPLY	25QH	Q29
** ON A/C NOT FOR ALL
121VU	FUEL/ACT/FUEL PUMP/SPLY	25QH	Q29

Subtask 28-28-00-860-056-A ** ON A/C NOT FOR ALL

C. Put the aircraft back to its initial configuration.
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Remove the WARNING NOTICE(S).
(3) Remove the ground support and maintenance equipment, the special and standard tools and all other items.
(4) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).

[Rev.10 from 2021] 2026.04.02 06:17:51 UTC