DOC AIRBUS | AMM A320FLeak Check of the Fuel Nozzles for DAC Engines [CFMB]
TASK 73-11-40-790-002-A-01
Leak Check of the Fuel Nozzles for DAC Engines
1. Reason for the Job
This TASK is applicable for DAC Engines.
Pre SB CFM56-5B 72-181
To check the fuel supply manifold and fuel nozzle coupling nuts, shrouds and drain tubes for leaks after the fuel nozzles or the other fuel system components have been installed or when leaks have been detected.
Post SB CFM56-5B 72-181
To check the fuel supply manifold and fuel nozzle coupling nuts for leaks after the fuel nozzles or the other fuel system components have been installed or when leaks have been detected.
End of SB CFM56-5B 72-181
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Consumable Materials
C. Work Zones and Access Panels
D. Referenced Information
3. Job Set-up
Subtask 73-11-40-941-059-A ** ON A/C NOT FOR ALL
Subtask 73-11-40-680-053-A ** ON A/C NOT FOR ALL Subtask 73-11-40-420-063-A ** ON A/C NOT FOR ALL
Subtask 73-11-40-410-069-A ** ON A/C NOT FOR ALL
[Rev.10 from 2021]
2026.04.01 02:57:59 UTC
Leak Check of the Fuel Nozzles for DAC Engines
1. Reason for the Job
This TASK is applicable for DAC Engines.
Pre SB CFM56-5B 72-181
To check the fuel supply manifold and fuel nozzle coupling nuts, shrouds and drain tubes for leaks after the fuel nozzles or the other fuel system components have been installed or when leaks have been detected.
Post SB CFM56-5B 72-181
To check the fuel supply manifold and fuel nozzle coupling nuts for leaks after the fuel nozzles or the other fuel system components have been installed or when leaks have been detected.
End of SB CFM56-5B 72-181
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | AR | ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE |
| No specific | AR | WARNING NOTICE(S) |
| No specific | Torque wrench: range to between 25 and 20 lbf.in (0.28 and 0.23 m.daN )  | |
| No specific | Torque wrench: range to between 133 and 122 lbf.in (1.50 and 1.38 m.daN ) | |
| No specific | Torque wrench: range to between 250 and 200 lbf.in (2.83 and 2.26 m.daN ) | |
| 856A1115 | 1 | CART,NITROGEN-FUEL MANIFOLD PRESSURE CHECK |
| REFERENCE | DESIGNATION |
|---|---|
| (Material No.CP2170) | leak-tek 160X |
| (Material No.CP2854) | vaseline |
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| FOR [1000EM1] (ENGINE-1) | |
| 437AL, 438AR, 451AL, 452AR | |
| FOR [1000EM2] (ENGINE-2) | |
| 447AL, 448AR, 461AL, 462AR | |
| REFERENCE | DESIGNATION |
|---|---|
| TASK 71-00-00-710-006-B | Minimum Idle Check |
| TASK 71-13-00-010-040-B | Opening of the Fan Cowl Doors |
| TASK 71-13-00-410-040-B | Closing of the Fan Cowl Doors |
| TASK 73-00-00-680-001-A | Draining of the Engine Fuel Circuit |
| TASK 73-11-40-000-002-A | Removal of the Fuel Nozzle for SAC Engines |
| TASK 73-11-40-000-002-A-01 | Removal of the Fuel Nozzle for DAC Engines |
| TASK 73-11-40-400-002-A | Installation of the Fuel Nozzle for SAC Engines |
| TASK 73-11-40-400-002-A-01 | Installation of the Fuel Nozzle for DAC Engines |
| TASK 78-30-00-081-041-B | Make the Thrust Reverser Serviceable after Maintenance |
| TASK 78-30-00-481-041-B | Make the Thrust Reverser Unserviceable for Maintenance |
| TASK 78-36-00-010-040-B | Opening of the Thrust Reverser Doors |
| TASK 78-36-00-410-040-B | Closing of the Thrust Reverser Doors |
Fuel Nozzle Coupling Nut Leak Check (Nitrogen Cart Connection) (Only Applicable for SAC Engines)Subtask 73-11-40-941-059-A ** ON A/C NOT FOR ALL
A. Safety Precautions
(1) On the center pedestal, on the ENG panel 115VU:
(a) Put a WARNING NOTICE(S) to tell persons not to start the engine.
(2) Make sure that the engine 1(2) shutdown occurred not less than 5 minutes before you do this procedure.
(3) On the overhead maintenance panel 50VU:
(a) Make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put a WARNING NOTICE(S) to tell persons not to energize the FADEC 1(2).
Subtask 73-11-40-010-073-A ** ON A/C NOT FOR ALL (1) On the center pedestal, on the ENG panel 115VU:
(a) Put a WARNING NOTICE(S) to tell persons not to start the engine.
(2) Make sure that the engine 1(2) shutdown occurred not less than 5 minutes before you do this procedure.
(3) On the overhead maintenance panel 50VU:
(a) Make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put a WARNING NOTICE(S) to tell persons not to energize the FADEC 1(2).
B. Get Access
(1) Open the fan cowl doors: (Ref. AMM TASK 71-13-00-010-040)
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(2) Put the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position.
Subtask 73-11-40-040-064-A ** ON A/C NOT FOR ALL Subtask 73-11-40-010-074-A ** ON A/C NOT FOR ALL (1) Open the fan cowl doors: (Ref. AMM TASK 71-13-00-010-040)
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(2) Put the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position.
D. Open the thrust reverser doors: (Ref. AMM TASK 78-36-00-010-040)
(1) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(2) FOR [1000EM2] (ENGINE-2)
461AL 462AR
4. Procedure(1) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(2) FOR [1000EM2] (ENGINE-2)
461AL 462AR
Subtask 73-11-40-680-053-A ** ON A/C NOT FOR ALL Subtask 73-11-40-420-063-A ** ON A/C NOT FOR ALL
B. Pre SB CFM56-5B 72-181 Install the fuel drain tube
(1) Slide both of the drain shrouds over the inlets of the fuel nozzle(s) and turn clockwise 90 degrees. The drain opening should be on the top of the connection when the shroud is correctly installed.
(2) Ensure that a new O-ring (160) lubricated with vaseline (Material No.CP2854) is installed on each fuel drain tube to be installed.
(3) Install the fuel drain tube to the opening at the top of each shroud and to the fuel drain manifold by sliding the end(s) of the drain tube with the O-ring(s) installed into the opening of the drain shroud(s).
(4) TORQUE the coupling nuts that attach the fuel drain tubes to the drain manifold to between 133 and 122 lbf.in (1.50 and 1.38 m.daN ).
End of Pre SB CFM56-5B 72-181
Subtask 73-11-40-790-054-A ** ON A/C NOT FOR ALL (1) Slide both of the drain shrouds over the inlets of the fuel nozzle(s) and turn clockwise 90 degrees. The drain opening should be on the top of the connection when the shroud is correctly installed.
(2) Ensure that a new O-ring (160) lubricated with vaseline (Material No.CP2854) is installed on each fuel drain tube to be installed.
(3) Install the fuel drain tube to the opening at the top of each shroud and to the fuel drain manifold by sliding the end(s) of the drain tube with the O-ring(s) installed into the opening of the drain shroud(s).
(4) TORQUE the coupling nuts that attach the fuel drain tubes to the drain manifold to between 133 and 122 lbf.in (1.50 and 1.38 m.daN )
. End of Pre SB CFM56-5B 72-181
C. Check the fuel nozzle shrouds and drain tubes for leaks as follows:
(1) Install the correct adapter and hose from the 856A1115 CART,NITROGEN-FUEL MANIFOLD PRESSURE CHECK.
(2) Disconnect the fuel overboard drain tube (5) from the fuel drain tube (50).
(3) Install a protective cover on the open end of the overboard drain tube (5).
(4) If necessary, loosen or remove the nut (20) and bolt (15) and open the clamp (10) to move the fuel overboard drain tube (5) out of the way. If necessary, loosen or remove the bolt (25), washer (30) and nut (35) to move the tube (5).
(5) Connect the hose and the adapter to the fitting on the fuel drain tube (50).
(6) Pressurize the fuel supply drain manifold.
(7) Stop the nitrogen pressure source and monitor the pressure decrease for 2 minutes.
(8) The decrease of pressure must not be more than 10 psi (0.68 bar) in 2 minutes.
(9) If there is leakage of more than 10 psi (0.68 bar) in 2 minutes, do the following steps:
Pre SB CFM56-5B 72-181
(a) Apply a small quantity of leak-tek 160X (Material No.CP2170) to all of the shroud connectors and the drain connectors.
(b) Examine the fuel manifold shroud connectors and the drain tube connectors for leaks. The leaks will be shown by bubbles in the leak-tek 160X (Material No.CP2170) .
End of Pre SB CFM56-5B 72-181
Post SB CFM56-5B 72-181
(c) Apply a small quantity of leak-tek 160X (Material No.CP2170) to all of the drain connectors.
(d) Examine the drain tube connectors for leaks. The leaks will be shown by bubbles in the leak-tek 160X (Material No.CP2170) . If there are no leaks, go to step 4.C.(13).(a).
End of Post SB CFM56-5B 72-181
Pre SB CFM56-5B 72-181
(10) If leaks are found at the shroud connectors, correct them as follows:
(a) Stop the nitrogen pressure.
(b) Disconnect the fuel drain tube(s).
(c) Loosen the shroud connector and slide the shroud connector back.
(d) Check the O-rings (140 and 150) for damage.
(e) If no damage is found, tighten the shroud connector and install the drain lines.
(f) If damage is found, replace the O-ring (150) at the shroud connector (Ref. AMM TASK 73-11-40-000-002) and (Ref. AMM TASK 73-11-40-400-002).
(g) If a leak is at the drain shroud and the fuel supply tube, remove the drain tube and loosen the connector of the drain shroud.
(h) Slide the drain shroud back to examine the O-ring (140) on the fuel supply tube.
(i) If the O-ring (140) is damaged, replace the O-ring (Ref. AMM TASK 73-11-40-000-002) and (Ref. AMM TASK 73-11-40-400-002).
(j) Do the steps (6) thru (9) again.
(k) If there is still a leak at the shroud connector or at the shroud and the fuel supply tube, replace the nozzle (Ref. AMM TASK 73-11-40-000-002) and (Ref. AMM TASK 73-11-40-400-002) and do steps (6) thru (9) again.
(11) If there are no leaks, decrease the nitrogen pressure to between 8 and 12 psi (0.55 and 0.83 bar).
(12) Isolate the 856A1115 CART,NITROGEN-FUEL MANIFOLD PRESSURE CHECK. The pressure must not decrease more than 5 psi (0.34 bar) in three minutes.
(13) If there is still a leak and you cannot see the leakage at the fuel nozzle connections, do a check at the 6 o'clock junction box for leakage:
(a) Apply leak-tek 160X (Material No.CP2170) to the connection of the fuel drain tube at the 6 O'clock junction box.
(b) Apply between 50 and 60 psi (3.4 and 4.1 bar) to the fuel drain tube (50) and look for signs of leakage at the tube connection.
(c) If there are no leaks, decrease the nitrogen pressure to between 8 and 12 psi (0.55 and 0.83 bar).
(d) Isolate the 856A1115 CART,NITROGEN-FUEL MANIFOLD PRESSURE CHECK. The pressure must not decrease more than 5 psi (0.34 bar) in three minutes.
(e) If a leak is found, make sure the tube nut is tightened to the correct torque value and is not damaged. Tighten, repair or replace if it is necessary.
(14) Disconnect the 856A1115 CART,NITROGEN-FUEL MANIFOLD PRESSURE CHECK from the fuel drain tube (50).
(15) Remove the adapter and the hose from the 856A1115 CART,NITROGEN-FUEL MANIFOLD PRESSURE CHECK.
(16) Remove the protective cover from the overboard drain tube (5).
(17) Install the overboard drain tube (5) to the fuel drain tube (50). Do not torque the coupling nut at this time.
(18) If necessary, install the clamp (10), the bolt (15) and the nut (20) to attach the overboard drain tube (5) to the bracket on the transfer gearbox.
(19) If necessary, attach the overboard drain tube (5) to the bracket on the bottom of the transfer gearbox with the bolt (25), the spacer (30) and the nut (35).
(20) If necessary, TORQUE the nuts (20, 35) to between 25 and 20 lbf.in (0.28 and 0.23 m.daN ).
(21) TORQUE drain tube and coupling nut.
.
(22) Return to the fuel nozzle.
Subtask 73-11-40-410-068-A ** ON A/C NOT FOR ALL (1) Install the correct adapter and hose from the 856A1115 CART,NITROGEN-FUEL MANIFOLD PRESSURE CHECK.
(2) Disconnect the fuel overboard drain tube (5) from the fuel drain tube (50).
(3) Install a protective cover on the open end of the overboard drain tube (5).
(4) If necessary, loosen or remove the nut (20) and bolt (15) and open the clamp (10) to move the fuel overboard drain tube (5) out of the way. If necessary, loosen or remove the bolt (25), washer (30) and nut (35) to move the tube (5).
(5) Connect the hose and the adapter to the fitting on the fuel drain tube (50).
(6) Pressurize the fuel supply drain manifold.
WARNING:
DO NOT PRESSURIZE THE FUEL SUPPLY MANIFOLD NEAR AN OPEN FLAME. A FIRE CAN OCCUR.
(a) Apply between 50 and 60 psi (3.4 and 4.1 bar) to the fuel drain tube (50). (7) Stop the nitrogen pressure source and monitor the pressure decrease for 2 minutes.
(8) The decrease of pressure must not be more than 10 psi (0.68 bar) in 2 minutes.
(9) If there is leakage of more than 10 psi (0.68 bar) in 2 minutes, do the following steps:
Pre SB CFM56-5B 72-181
(a) Apply a small quantity of leak-tek 160X (Material No.CP2170) to all of the shroud connectors and the drain connectors.
(b) Examine the fuel manifold shroud connectors and the drain tube connectors for leaks. The leaks will be shown by bubbles in the leak-tek 160X (Material No.CP2170) .
End of Pre SB CFM56-5B 72-181
Post SB CFM56-5B 72-181
(c) Apply a small quantity of leak-tek 160X (Material No.CP2170) to all of the drain connectors.
(d) Examine the drain tube connectors for leaks. The leaks will be shown by bubbles in the leak-tek 160X (Material No.CP2170) . If there are no leaks, go to step 4.C.(13).(a).
End of Post SB CFM56-5B 72-181
Pre SB CFM56-5B 72-181
(10) If leaks are found at the shroud connectors, correct them as follows:
(a) Stop the nitrogen pressure.
(b) Disconnect the fuel drain tube(s).
(c) Loosen the shroud connector and slide the shroud connector back.
(d) Check the O-rings (140 and 150) for damage.
(e) If no damage is found, tighten the shroud connector and install the drain lines.
(f) If damage is found, replace the O-ring (150) at the shroud connector (Ref. AMM TASK 73-11-40-000-002) and (Ref. AMM TASK 73-11-40-400-002).
(g) If a leak is at the drain shroud and the fuel supply tube, remove the drain tube and loosen the connector of the drain shroud.
(h) Slide the drain shroud back to examine the O-ring (140) on the fuel supply tube.
(i) If the O-ring (140) is damaged, replace the O-ring (Ref. AMM TASK 73-11-40-000-002) and (Ref. AMM TASK 73-11-40-400-002).
(j) Do the steps (6) thru (9) again.
(k) If there is still a leak at the shroud connector or at the shroud and the fuel supply tube, replace the nozzle (Ref. AMM TASK 73-11-40-000-002) and (Ref. AMM TASK 73-11-40-400-002) and do steps (6) thru (9) again.
(11) If there are no leaks, decrease the nitrogen pressure to between 8 and 12 psi (0.55 and 0.83 bar).
(12) Isolate the 856A1115 CART,NITROGEN-FUEL MANIFOLD PRESSURE CHECK. The pressure must not decrease more than 5 psi (0.34 bar) in three minutes.
(13) If there is still a leak and you cannot see the leakage at the fuel nozzle connections, do a check at the 6 o'clock junction box for leakage:
(a) Apply leak-tek 160X (Material No.CP2170) to the connection of the fuel drain tube at the 6 O'clock junction box.
(b) Apply between 50 and 60 psi (3.4 and 4.1 bar) to the fuel drain tube (50) and look for signs of leakage at the tube connection.
(c) If there are no leaks, decrease the nitrogen pressure to between 8 and 12 psi (0.55 and 0.83 bar).
(d) Isolate the 856A1115 CART,NITROGEN-FUEL MANIFOLD PRESSURE CHECK. The pressure must not decrease more than 5 psi (0.34 bar) in three minutes.
(e) If a leak is found, make sure the tube nut is tightened to the correct torque value and is not damaged. Tighten, repair or replace if it is necessary.
(14) Disconnect the 856A1115 CART,NITROGEN-FUEL MANIFOLD PRESSURE CHECK from the fuel drain tube (50).
(15) Remove the adapter and the hose from the 856A1115 CART,NITROGEN-FUEL MANIFOLD PRESSURE CHECK.
(16) Remove the protective cover from the overboard drain tube (5).
(17) Install the overboard drain tube (5) to the fuel drain tube (50). Do not torque the coupling nut at this time.
(18) If necessary, install the clamp (10), the bolt (15) and the nut (20) to attach the overboard drain tube (5) to the bracket on the transfer gearbox.
(19) If necessary, attach the overboard drain tube (5) to the bracket on the bottom of the transfer gearbox with the bolt (25), the spacer (30) and the nut (35).
(20) If necessary, TORQUE the nuts (20, 35) to between 25 and 20 lbf.in (0.28 and 0.23 m.daN )
. (21) TORQUE drain tube and coupling nut.
CAUTION:
USE A SECOND WRENCH TO HOLD THE FITTINGS WHEN YOU LOOSEN/TIGHTEN THE TUBE COUPLING NUTS. THIS PREVENTS DAMAGE TO THE TUBES.
(a) TORQUE the overboard drain tube (5) coupling nut to between 250 and 200 lbf.in (2.83 and 2.26 m.daN ) . (22) Return to the fuel nozzle.
WARNING:
DO NOT DRY-MOTOR THE ENGINE NEAR AN OPEN FLAME. THE GASES FROM THE FUEL IN THE COMBUSTOR CAN CAUSE A FIRE.
(a) Return to the fuel nozzle installation procedure to install hardware removed to get access to the fuel nozzle(s) and to complete the necessary tests or proceed as follows (Ref. AMM TASK 73-11-40-400-002). D. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the thrust reverser doors: (Ref. AMM TASK 78-36-00-410-040).
(a) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(b) FOR [1000EM2] (ENGINE-2)
461AL 462AR
(3) Remove the access platform(s).
Subtask 73-11-40-440-059-A ** ON A/C NOT FOR ALL Subtask 73-11-40-710-059-A ** ON A/C NOT FOR ALL 5. Close-up(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the thrust reverser doors: (Ref. AMM TASK 78-36-00-410-040).
(a) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(b) FOR [1000EM2] (ENGINE-2)
461AL 462AR
(3) Remove the access platform(s).
Subtask 73-11-40-410-069-A ** ON A/C NOT FOR ALL