DOC AIRBUS | AMM A320FLeak Check of the Fuel Nozzles [CFMI]
TASK 73-11-40-790-001-A
Leak Check of the Fuel Nozzles
1. Reason for the Job
To check the fuel supply manifold for leaks after the fuel nozzles or the other fuel system components have been installed or when leaks have been detected.
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 73-11-40-941-051-A ** ON A/C NOT FOR ALL
Subtask 73-11-40-790-050-A ** ON A/C NOT FOR ALL
Subtask 73-11-40-410-053-A ** ON A/C NOT FOR ALL
[Rev.10 from 2021]
2026.04.01 02:55:32 UTC
Leak Check of the Fuel Nozzles
1. Reason for the Job
To check the fuel supply manifold for leaks after the fuel nozzles or the other fuel system components have been installed or when leaks have been detected.
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 150 and 135 lbf.in (1.70 and 1.53 m.daN )  | |
| No specific | Torque wrench: range to between 1100 and 900 lbf.in (12.43 and 10.17 m.daN ) | |
| 856A1115 | 1 | CART,NITROGEN-FUEL MANIFOLD PRESSURE CHECK |
| REFERENCE | DESIGNATION |
|---|---|
| (Material No.CP2170) | leak-tek 160X |
| 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-A | Minimum Idle Check |
| TASK 71-13-00-010-040-A | Opening of the Fan Cowl Doors |
| TASK 71-13-00-410-040-A | Closing of the Fan Cowl Doors |
| TASK 73-11-30-200-001-A | Inspection/Check of the Fuel Manifold Assembly |
| TASK 73-11-40-000-001-A | Removal of the Fuel Nozzles |
| TASK 73-11-40-400-001-A | Installation of the Fuel Nozzles |
| TASK 78-30-00-081-041-A | Make the Thrust Reverser Serviceable after Maintenance |
| TASK 78-30-00-481-041-A | Make the Thrust Reverser Unserviceable for Maintenance |
| TASK 78-36-00-010-040-A | Opening of the Thrust Reverser Doors |
| TASK 78-36-00-410-040-A | Closing of the Thrust Reverser Doors |
Fuel Nozzle Leak Check (Nitrogen Cart Connection)Subtask 73-11-40-941-051-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 73-11-40-010-051-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 an ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position.
Subtask 73-11-40-040-052-A ** ON A/C NOT FOR ALL Subtask 73-11-40-010-053-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 an 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 73-11-40-790-050-A ** ON A/C NOT FOR ALL
A. Do a leak check at the coupling nut of the fuel nozzles as follows:
(2) Disconnect the fuel supply hose from the fuel injection supply tube at the discharge end of the fuel flow transmitter.
(3) Connect the hose and the adaptor of the 856A1115 CART,NITROGEN-FUEL MANIFOLD PRESSURE CHECK (856A1115G07 or 856A1115G08) to the coupling nut of the fuel injection supply tube.
PRE SB 73-128
(4) Disconnect the drain tubes from the shroud connectors.
(5) Disconnect the shroud connectors from the fuel nozzles to get access to the fuel nozzle coupling nuts.
POST SB 73-128
(6) Disconnect the shroud connectors from the fuel nozzles to get to the fuel nozzle coupling nuts.
END OF SB 73-128
(7) Pressurize the fuel supply manifold.
(8) Stop the nitrogen pressure when all of the remaining fuel is removed from the fuel supply manifold.
(9) Apply a small quantity of leak-tek 160X (Material No.CP2170) to all of the coupling nuts of the fuel nozzle.
(10) Apply a minimum of 15 psi (1.03 bar) of nitrogen to the fuel supply manifold.
(12) Examine the coupling nuts of the fuel nozzles for leaks. The leaks will be shown by bubbles in the leak-tek 160X (Material No.CP2170) .
(13) If leaks are found at the coupling nuts of the nozzles, correct them as follows:
(a) Stop the nitrogen pressure.
(b) Disconnect the coupling nut.
(c) Do an inspection of the ferrule and the seating surfaces (Ref. AMM TASK 73-11-30-200-001).
(d) Do steps (6) thru (10) again.
(14) If the coupling nut continues to show leaks, replace the fuel nozzle (Ref. AMM TASK 73-11-40-000-001) and (Ref. AMM TASK 73-11-40-400-001).
(16) Isolate the 856A1115 CART,NITROGEN-FUEL MANIFOLD PRESSURE CHECK (856A1115G07 or 856A1115G08). The pressure must not decrease more that 5 psi (0.34 bar) in three minutes.
(17) Disconnect the 856A1115 CART,NITROGEN-FUEL MANIFOLD PRESSURE CHECK (856A1115G07 or 856A1115G08).
(18) Remove the adaptor from the nitrogen cart, (856A1115G07 or 856A1115G08) hose.
(19) Connect the fuel injection supply tube to the fuel supply hose.
(20) TORQUE the coupling nut to between 1100 and 900 lbf.in (12.43 and 10.17 m.daN ).
PRE SB 73-128
(21) Connect the fuel nozzle shroud connectors to the fuel nozzles and the drain tubes to the fuel nozzle shroud connectors.
(a) Tighten the fuel nozzle connectors by hand plus one-eighth of a turn.
(b) TORQUE the drain tube coupling nuts to between 150 and 135 lbf.in (1.70 and 1.53 m.daN ).
POST SB 73-128
(22) Connect the fuel nozzle shroud connectors to the fuel nozzles. Tighten the fuel nozzle shroud connectors by hand plus one-eighth of a turn.
END OF SB 73-128
Subtask 73-11-40-410-052-A ** ON A/C NOT FOR ALL WARNING:
DO NOT DRY-MOTOR THE ENGINE NEAR AN OPEN FLAME. THE GASES FROM THE FUEL IN THE COMBUSTOR CAN CAUSE A FIRE.
CAUTION:
DO NOT SUPPLY AIR PRESSURE INTO THE FUEL FLOW TRANSMITTER LINE.
(1) Install the correct adapter and hose from the 856A1115 CART,NITROGEN-FUEL MANIFOLD PRESSURE CHECK (856A1115G07 or 856A1115G08). (2) Disconnect the fuel supply hose from the fuel injection supply tube at the discharge end of the fuel flow transmitter.
(3) Connect the hose and the adaptor of the 856A1115 CART,NITROGEN-FUEL MANIFOLD PRESSURE CHECK (856A1115G07 or 856A1115G08) to the coupling nut of the fuel injection supply tube.
PRE SB 73-128
(4) Disconnect the drain tubes from the shroud connectors.
(5) Disconnect the shroud connectors from the fuel nozzles to get access to the fuel nozzle coupling nuts.
POST SB 73-128
(6) Disconnect the shroud connectors from the fuel nozzles to get to the fuel nozzle coupling nuts.
END OF SB 73-128
(7) Pressurize the fuel supply manifold.
WARNING:
DO NOT PRESSURIZE THE FUEL SUPPLY MANIFOLD NEAR AN OPEN FLAME. A FIRE CAN OCCUR.
(a) Apply between 80 psi (5.51 bar) and 100 psi (6.90 bar) to the supply manifold. (8) Stop the nitrogen pressure when all of the remaining fuel is removed from the fuel supply manifold.
(9) Apply a small quantity of leak-tek 160X (Material No.CP2170) to all of the coupling nuts of the fuel nozzle.
(10) Apply a minimum of 15 psi (1.03 bar) of nitrogen to the fuel supply manifold.
NOTE: The nozzle check valves usually open at 15 psi (1.03 bar) to 30 psi (2.06 bar). More than 60 psi (4.13 bar) is permitted.
(11) Slowly increase the pressure until it becomes stable at a pressure that opens one of the fuel nozzle check valves. (12) Examine the coupling nuts of the fuel nozzles for leaks. The leaks will be shown by bubbles in the leak-tek 160X (Material No.CP2170) .
(13) If leaks are found at the coupling nuts of the nozzles, correct them as follows:
(a) Stop the nitrogen pressure.
(b) Disconnect the coupling nut.
(c) Do an inspection of the ferrule and the seating surfaces (Ref. AMM TASK 73-11-30-200-001).
(d) Do steps (6) thru (10) again.
(14) If the coupling nut continues to show leaks, replace the fuel nozzle (Ref. AMM TASK 73-11-40-000-001) and (Ref. AMM TASK 73-11-40-400-001).
NOTE: For a complete set (20) of new or recently overhauled fuel nozzles, and all 20 fuel nozzles with 0 (zero) hours running time, steps 15 and 16 can be ignored.
(15) If there are no leaks, decrease the nitrogen pressure to between 8 psi (0.55 bar) and 12 psi (0.82 bar). (16) Isolate the 856A1115 CART,NITROGEN-FUEL MANIFOLD PRESSURE CHECK (856A1115G07 or 856A1115G08). The pressure must not decrease more that 5 psi (0.34 bar) in three minutes.
(17) Disconnect the 856A1115 CART,NITROGEN-FUEL MANIFOLD PRESSURE CHECK (856A1115G07 or 856A1115G08).
(18) Remove the adaptor from the nitrogen cart, (856A1115G07 or 856A1115G08) hose.
(19) Connect the fuel injection supply tube to the fuel supply hose.
(20) TORQUE the coupling nut to between 1100 and 900 lbf.in (12.43 and 10.17 m.daN )
. PRE SB 73-128
(21) Connect the fuel nozzle shroud connectors to the fuel nozzles and the drain tubes to the fuel nozzle shroud connectors.
(a) Tighten the fuel nozzle connectors by hand plus one-eighth of a turn.
(b) TORQUE the drain tube coupling nuts to between 150 and 135 lbf.in (1.70 and 1.53 m.daN )
. POST SB 73-128
(22) Connect the fuel nozzle shroud connectors to the fuel nozzles. Tighten the fuel nozzle shroud connectors by hand plus one-eighth of a turn.
END OF SB 73-128
B. 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 WARNING NOTICE(S).
Subtask 73-11-40-440-051-A ** ON A/C NOT FOR ALL Subtask 73-11-40-710-051-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 WARNING NOTICE(S).
Subtask 73-11-40-410-053-A ** ON A/C NOT FOR ALL