DOC AIRBUS | AMM A320FInstallation of the Servo Fuel Heater [CFMB]
TASK 73-11-20-400-002-A
Installation of the Servo Fuel Heater
1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Consumable Materials
C. Work Zones and Access Panels
D. Expendable Parts
E. Referenced Information
3. Job Set-up
Subtask 73-11-20-860-051-A ** ON A/C NOT FOR ALL
Subtask 73-11-20-420-053-A ** ON A/C NOT FOR ALL
Subtask 73-11-20-410-052-A ** ON A/C NOT FOR ALL
[Rev.10 from 2021]
2026.04.01 02:57:45 UTC
Installation of the Servo Fuel Heater
1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Consumable Materials
| REFERENCE | DESIGNATION |
|---|---|
| (Material No.CP2101) | graphite grease |
| (Material No.CP2442) | engine oil |
| (Material No.CP8001) | lockwire 0.032 in. (0.8 mm) dia. |
| (Material No.CP8002) | lockwire 0.032 in. (0.8 mm) dia |
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| FOR [1000EM1] (ENGINE-1) | |
| 437AL, 438AR | |
| FOR [1000EM2] (ENGINE-2) | |
| 447AL, 448AR | |
| FIG.ITEM | DESIGNATION | IPC-CSN |
|---|---|---|
| 90 | O-RING | AIPC 73-11-20-01-020 |
| 95 | O-RING | AIPC 73-11-20-01-020 |
| 120 | GASKET-SEAL | AIPC 73-11-20-01-100 |
| 155 | GASKET | AIPC 73-11-20-01-100 |
| 70 | GASKET | AIPC 73-11-20-01-140 |
| REFERENCE | DESIGNATION |
|---|---|
| TASK 70-21-00-918-002-A | Seals (Preformed Packings and O-rings) and Gaskets |
| 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 |
Servo-Fuel HeaterSubtask 73-11-20-860-051-A ** ON A/C NOT FOR ALL
A. Aircraft Maintenance Configuration
(1) On the center pedestal, on the ENG panel 115VU, make sure that a WARNING NOTICE(S) is in position to tell persons not to start the engine.
(2) On the overhead maintenance panel 50VU, make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off. Make sure that a WARNING NOTICE(S) is in position to tell persons not to energize the FADEC 1(2).
Subtask 73-11-20-010-054-A ** ON A/C NOT FOR ALL (1) On the center pedestal, on the ENG panel 115VU, make sure that a WARNING NOTICE(S) is in position to tell persons not to start the engine.
(2) On the overhead maintenance panel 50VU, make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off. Make sure that a WARNING NOTICE(S) is in position to tell persons not to energize the FADEC 1(2).
B. Make sure that the fan cowl doors are open: (Ref. AMM TASK 71-13-00-010-040)
(1) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(2) FOR [1000EM2] (ENGINE-2)
447AL 448AR
4. Procedure(1) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(2) FOR [1000EM2] (ENGINE-2)
447AL 448AR
Subtask 73-11-20-420-053-A ** ON A/C NOT FOR ALL
A. Preparation for Installation
(1) Remove blanking plugs or covers from the ports and orifices of the servo fuel heater (80), main oil/fuel heat exchanger (60) and fuel pump.
(2) If necessary, lightly coat two new AIPC 73-11-20-01-020 O-RING (90) and AIPC 73-11-20-01-020 O-RING (95) with engine oil (Material No.CP2442) and install one O-ring on each of the two nipples (10).
(3) If necessary, lightly coat the two nipples (10) with engine oil (Material No.CP2442) and install one nipple on the FUEL IN and on the FUEL OUT ports of the servo fuel heater (80). Torque nipples (10) to between 400 and 360 lbf.in (4.52 and 4.07 m.daN )
. Safety the nipples with CP8001 lockwire 0.032 in. (0.8 mm) dia. CP8002 lockwire 0.032 in. (0.8 mm) dia
Subtask 73-11-20-210-052-A ** ON A/C NOT FOR ALL (1) Remove blanking plugs or covers from the ports and orifices of the servo fuel heater (80), main oil/fuel heat exchanger (60) and fuel pump.
(2) If necessary, lightly coat two new AIPC 73-11-20-01-020 O-RING (90) and AIPC 73-11-20-01-020 O-RING (95) with engine oil (Material No.CP2442) and install one O-ring on each of the two nipples (10).
(3) If necessary, lightly coat the two nipples (10) with engine oil (Material No.CP2442) and install one nipple on the FUEL IN and on the FUEL OUT ports of the servo fuel heater (80). Torque nipples (10) to between 400 and 360 lbf.in (4.52 and 4.07 m.daN )
. Safety the nipples with B. Do a check of AIPC 73-11-20-01-140 GASKET (70), AIPC 73-11-20-01-100 GASKET-SEAL (120) and AIPC 73-11-20-01-100 GASKET (155) (Ref. AMM TASK 70-21-00-918-002). If in good condition, use them again. If not, discard and replace by new one (s).
Subtask 73-11-20-420-052-A ** ON A/C NOT FOR ALL NOTE: The gaskets (70), (120) and (155) are not expendable parts. They are disposable items which you replace only if not in good condition.
C. Installation of the Servo Fuel Heater
(2) Place the servo fuel heater (80) on the main oil/fuel heat exchanger (60).
(3) Lightly coat the six mounting studs of main oil/fuel heat exchanger (60) with graphite grease (Material No.CP2101) .
(4) Place the fire detection loop bracket (40), at its correct location, over two of the studs. Install the six washers (20) and nuts (30). Tighten nuts (30) by hand.
(5) Torque nuts (30) to between 110 and 100 lbf.in (1.24 and 1.13 m.daN ).
(6) Lightly coat gasket (120) with engine oil (Material No.CP2442) . Lightly coat four bolts (110) with graphite grease (Material No.CP2101) .
(7) Put the U-shaped OIL OUT tube (130) in its correct position between the OIL OUT port of the servo fuel heater (80) and the hose (100) to oil tank. Engage the gasket (120) in sandwich between the square flange of tube (130) and servo fuel heater. Then, engage the four bolts (110) and tighten them by hand.
TORQUE the bolts (110) to between 55 and 50 lbf.in (0.62 and 0.57 m.daN ).
(8) Engage the coupling nut (135) of the hose (100) on the fitting of OIL OUT tube (130). Tighten by hand.
TORQUE the coupling nut (135) to between 1100 and 900 lbf.in (12.43 and 10.17 m.daN ) . Safety the coupling nut (135) with CP8001 lockwire 0.032 in. (0.8 mm) dia. CP8002 lockwire 0.032 in. (0.8 mm) dia
(9) Lightly coat the FUEL OUT nipple (10) with engine oil (Material No.CP2442) .
(10) Engage by hand the coupling nut of FUEL OUT hose (140) on FUEL OUT nipple (10) of the servo fuel heater (80). TORQUE the coupling nut to between 770 and 650 lbf.in (8.70 and 7.35 m.daN ).
(11) Install the OIL IN tube (240) between the servo-fuel heater (80) and the hose (215) to the master magnetic chip detector as follows:
(a) Lightly coat gasket (155) with engine oil (Material No.CP2442) . Lightly coat four bolts (150) with graphite grease (Material No.CP2101) .
(b) Put the OIL IN tube (240) in its correct position between the servo fuel heater and the hose (215) to the master magnetic chip detector and attach it loosely to the hose (215) with the coupling nut (210).
(c) Engage the gasket (155) in sandwich between the square flange of tube (240) and the servo fuel heater. Then, engage the four bolts (150) and tighten them by hand.
TORQUE the bolts (150) to between 55 and 50 lbf.in (0.62 and 0.57 m.daN ).
(d) Place plastic bushings (160) and clamp (170) on tube (240) and attach clamp (170) together with clamp (220) and clamp (190), to bracket (180) with bolt (200) and nut (230).
.
(f) TORQUE coupling nut (210) of hose (215) to between 1100 and 900 lbf.in (12.43 and 10.17 m.daN ) to complete the forward connection of the OIL IN tube (240). Safety the coupling nut (210) with CP8001 lockwire 0.032 in. (0.8 mm) dia. CP8002 lockwire 0.032 in. (0.8 mm) dia
(12) Lightly coat the FUEL IN nipple (10) on the servo fuel heater (80), the nipple (255) on the FUEL IN tube (260) and the fuel pump nipple, with engine oil (Material No.CP2442) .
(13) Loosely install the FUEL IN tube (260) between the servo fuel heater FUEL IN nipple (10) and the fuel pump nipple.
(14) TORQUE both coupling nuts of FUEL IN tube (260) to between 770 and 650 lbf.in (8.70 and 7.35 m.daN ).
(15) Connect the fuel pump HP hose (250) to the nipple (255) of FUEL IN tube (260) and TORQUE coupling nut of fuel pump HP hose (250) to between 150 and 135 lbf.in (1.70 and 1.53 m.daN ).
(16) Attach the fire detection loop to bracket (40).
Subtask 73-11-20-942-050-A ** ON A/C NOT FOR ALL NOTE: Remove blanking plugs as you reconnect tubes.
(1) Lightly coat gasket (70) with engine oil (Material No.CP2442) and install on main oil/fuel exchanger (60) mating face. (2) Place the servo fuel heater (80) on the main oil/fuel heat exchanger (60).
(3) Lightly coat the six mounting studs of main oil/fuel heat exchanger (60) with graphite grease (Material No.CP2101) .
(4) Place the fire detection loop bracket (40), at its correct location, over two of the studs. Install the six washers (20) and nuts (30). Tighten nuts (30) by hand.
(5) Torque nuts (30) to between 110 and 100 lbf.in (1.24 and 1.13 m.daN )
. (6) Lightly coat gasket (120) with engine oil (Material No.CP2442) . Lightly coat four bolts (110) with graphite grease (Material No.CP2101) .
(7) Put the U-shaped OIL OUT tube (130) in its correct position between the OIL OUT port of the servo fuel heater (80) and the hose (100) to oil tank. Engage the gasket (120) in sandwich between the square flange of tube (130) and servo fuel heater. Then, engage the four bolts (110) and tighten them by hand.
TORQUE the bolts (110) to between 55 and 50 lbf.in (0.62 and 0.57 m.daN )
. (8) Engage the coupling nut (135) of the hose (100) on the fitting of OIL OUT tube (130). Tighten by hand.
TORQUE the coupling nut (135) to between 1100 and 900 lbf.in (12.43 and 10.17 m.daN )
. Safety the coupling nut (135) with (9) Lightly coat the FUEL OUT nipple (10) with engine oil (Material No.CP2442) .
(10) Engage by hand the coupling nut of FUEL OUT hose (140) on FUEL OUT nipple (10) of the servo fuel heater (80). TORQUE the coupling nut to between 770 and 650 lbf.in (8.70 and 7.35 m.daN )
. (11) Install the OIL IN tube (240) between the servo-fuel heater (80) and the hose (215) to the master magnetic chip detector as follows:
(a) Lightly coat gasket (155) with engine oil (Material No.CP2442) . Lightly coat four bolts (150) with graphite grease (Material No.CP2101) .
(b) Put the OIL IN tube (240) in its correct position between the servo fuel heater and the hose (215) to the master magnetic chip detector and attach it loosely to the hose (215) with the coupling nut (210).
(c) Engage the gasket (155) in sandwich between the square flange of tube (240) and the servo fuel heater. Then, engage the four bolts (150) and tighten them by hand.
TORQUE the bolts (150) to between 55 and 50 lbf.in (0.62 and 0.57 m.daN )
. (d) Place plastic bushings (160) and clamp (170) on tube (240) and attach clamp (170) together with clamp (220) and clamp (190), to bracket (180) with bolt (200) and nut (230).
NOTE: Make sure the three clamps (220), (170) and (190) are installed in their correct position and orientation relative to the AGB bracket (180).
(e) TORQUE bolt (200) to between 51 and 47 lbf.in (0.58 and 0.53 m.daN ) . (f) TORQUE coupling nut (210) of hose (215) to between 1100 and 900 lbf.in (12.43 and 10.17 m.daN )
to complete the forward connection of the OIL IN tube (240). Safety the coupling nut (210) with (12) Lightly coat the FUEL IN nipple (10) on the servo fuel heater (80), the nipple (255) on the FUEL IN tube (260) and the fuel pump nipple, with engine oil (Material No.CP2442) .
(13) Loosely install the FUEL IN tube (260) between the servo fuel heater FUEL IN nipple (10) and the fuel pump nipple.
(14) TORQUE both coupling nuts of FUEL IN tube (260) to between 770 and 650 lbf.in (8.70 and 7.35 m.daN )
. (15) Connect the fuel pump HP hose (250) to the nipple (255) of FUEL IN tube (260) and TORQUE coupling nut of fuel pump HP hose (250) to between 150 and 135 lbf.in (1.70 and 1.53 m.daN )
. (16) Attach the fire detection loop to bracket (40).
D. Put the aircraft back to the serviceable condition.
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Remove the WARNING NOTICE(S).
Subtask 73-11-20-710-051-A ** ON A/C NOT FOR ALL (1) Make sure that the work area is clean and clear of tools and other items.
(2) Remove the WARNING NOTICE(S).
E. Do a minimum idle check and make sure that there are no leaks at tube connections on servo fuel heater (Ref. AMM TASK 71-00-00-710-006).
5. Close-upSubtask 73-11-20-410-052-A ** ON A/C NOT FOR ALL