W DOC AIRBUS | AMM A320F

Installation of the Fuel Filter Differential Pressure Switch [CFMI]

TASK 73-34-15-400-040-A
Installation of the Fuel Filter Differential Pressure Switch

FIN: 1000EM1 ** ON A/C NOT FOR ALL
FIN: 1000EM2 ** ON A/C NOT FOR ALL
1. Reason for the Job
Self explanatory
2. Job Set-up Information
 A. Fixtures, Tools, Test and Support Equipment
REFERENCE
QTY
DESIGNATION
No specific
AR
ACCESS PLATFORM 1M(3 FT)
No specific
AR
OHMMETER MULTIRANGE
No specific
AR
PLIERS - ELECTRICAL, NOSE, RUBBER
No specific
AR
WARNING NOTICE(S)
No specific
Torque wrench: range to between 85 and 75 lbf.in (0.96 and 0.85 m.daN ) T
No specific
Torque wrench: range to between 135 and 125 lbf.in (1.53 and 1.41 m.daN ) T
No specific
Torque wrench: range to between 160 and 150 lbf.in (1.81 and 1.70 m.daN ) T
 B. Consumable Materials
REFERENCE
DESIGNATION
(Material No.CP1041)
isopropyl alcohol
(Material No.CP2244)
primer 1200
(Material No.CP8001)
lockwire 0.032 in. (0.8 mm) dia.
(Material No.14SBA1)
Textile-Lint free Cotton -
No specific
Fluorosilicone sealant DC 730
No specific
Fluorosilicone sealant FRV-1106
No specific
primer SS-4004
 C. Work Zones and Access Panels
ZONE/ACCESS
ZONE DESCRIPTION
FOR [1000EM1] (ENGINE-1)
437AL, 438AR
FOR [1000EM2] (ENGINE-2)
447AL, 448AR
 D. Expendable Parts
FIG.ITEM
DESIGNATION
IPC-CSN
25
PACKINGS
AIPC 73-34-15-01-020
 E. Referenced Information
REFERENCE
DESIGNATION
TASK 24-41-00-861-002-A
Energize the Aircraft Electrical Circuits from the External Power
TASK 24-41-00-861-002-A-01
Energize the Aircraft Electrical Circuits from the APU
TASK 24-41-00-861-002-A-02
Energize the Aircraft Electrical Circuits from Engine 1(2)
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 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
F Fuel Filter Differential Pressure Switch
3. Job Set-up
Subtask 73-34-15-860-052-A ** ON A/C NOT FOR ALL
A. Aircraft Maintenance Configuration
   (1) Make sure that the aircraft electrical circuits are energized (Ref. AMM TASK 24-41-00-861-002).
   (2) 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.
   (3) Make sure that the ENG/MASTER CONTROL SWITCH is in OFF position.
   (4) 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).
   (5) Make sure that the ACCESS PLATFORM 1M(3 FT) is in position.
Subtask 73-34-15-865-062-A ** ON A/C NOT FOR ALL
B. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:
PANELDESIGNATIONFINLOCATION
** ON A/C NOT FOR ALL
FOR FIN: 1000EM1 (ENGINE1)
49VUFUEL/LP VALVE/MOT1/ENG11QGA08
121VUFUEL/LP VALVE/MOT2/ENG13QGM25
FOR FIN: 1000EM2 (ENGINE2)
49VUFUEL/LP VALVE/MOT1/ENG22QGA09
121VUFUEL/LP VALVE/MOT2/ENG24QGM26
Subtask 73-34-15-865-063-A ** ON A/C NOT FOR ALL
C. Make sure that this(these) circuit breaker(s) is(are) closed:
PANELDESIGNATIONFINLOCATION
** ON A/C NOT FOR ALL
FOR FIN: 1000EM1 (ENGINE1)
49VUENGINE/1/HP FUEL SOV1KC1A01
FOR FIN: 1000EM2 (ENGINE2)
49VUENGINE/2/HP FUEL SOV1KC2A02
Subtask 73-34-15-010-055-A ** ON A/C NOT FOR ALL
D. 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
Subtask 73-34-15-110-051-A ** ON A/C NOT FOR ALL
E. Cleaning of the pressure switch
WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.
   (1) To be sure of a good electrical bond between the pressure switch (20) and the bracket, clean the mating surfaces with isopropyl alcohol (Material No.CP1041) and a Textile-Lint free Cotton - (Material No.14SBA1) .
4. Procedure
Subtask 73-34-15-420-052-A ** ON A/C NOT FOR ALL
A. Installation of the Fuel Filter Differential Pressure Switch
   (1) Remove the protective covers from the fuel tubes (35) and (40), the unions (30), and the switch (20).
   (2) Put the switch on the bracket and attach it with the bolts (10) and washers (15).
   (3) TORQUE the bolts (10) to between 85 and 75 lbf.in (0.96 and 0.85 m.daN ) T.
Subtask 73-34-15-760-050-A ** ON A/C NOT FOR ALL
B. Do an electrical bond resistance check as follows:
NOTE: Do an electrical bond resistance check at each bolt location.
   (1) Put one lead of the OHMMETER MULTIRANGE on the flange of the pressure switch (20) near the bolt (10).
   (2) Put the other lead of the ohmmeter on the surface of the bracket.
   (3) The resistance measured between the ohmmeter leads must not be more than 0.0025 ohm. Do the check two more times.
   (4) If the resistance is more than 0.0025 ohm, remove the pressure switch (20) and clean the mating surfaces again. Do this procedure until the resistance is less than 0.0025 ohm.
Subtask 73-34-15-390-050-A ** ON A/C NOT FOR ALL
C. Seal the electrical bond surfaces
   (1) Using of primer
WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.
     (a) Mix the primer 1200 (Material No.CP2244) or primer SS-4004 per the manufacturer's instructions.
     (b) Apply the primer around each bolt head and around the switch where it touches the bracket.
NOTE: The minimum time for the primer to cure is one hour at 70 deg.F (21.1 deg.C)
WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.
   (2) Using of sealant
NOTE: The sealant should not be applied when the temperature is below 50 deg.F (10 deg.C).
NOTE: Use the Fluorosilicone sealant DC 730 with the primer (DC 1200) or Fluorosilicone sealant FRV-1106 with the primer (SS 4004).
     (a) Apply a layer of sealant between 0.010 in. and 0.020 in. (0.25 and 0.51 m) thick around each bolt head, and around the pressure switch where it touches the bracket.
     (b) Allow the sealant to cure for a minimum of 24 hours, or as specified in the manufacturer's instructions.
NOTE: To decrease the cure time, allow the sealant to cure for a minimum of 2 hours. After 2 hours apply a maximum of 120 deg.F (49 deg.C) heat to the sealant for a minimum of 2 hours.
Subtask 73-34-15-420-053-B ** ON A/C NOT FOR ALL
D. Installation of unions, tubes and electrical connector
   (1) Put the AIPC 73-34-15-01-020 PACKINGS (25) on the unions (30) and install the unions in the switch (20).
   (2) TORQUE the unions (30) to between 135 and 125 lbf.in (1.53 and 1.41 m.daN ) T.
   (3) Connect the fuel tubes (35) and (40) to the unions on the switch. TORQUE the tube coupling nuts to between 160 and 150 lbf.in (1.81 and 1.70 m.daN ) T.
NOTE: Use a second wrench to hold the unions (30) when you torque the coupling nuts.
   (4) Install the insulation housing on the pressure switch.
     (a) Install the insulation housing (5) on the pressure switch (20).
     (b) Attach the CP8001lockwire 0.032 in. (0.8 mm) dia. to the capstan on the insulation housing (5). Wind the lockwire around the insulation housing (5) and attach it to the capstan on the opposite side.
NOTE: Do not tighten the lockwire more than necessary to hold the insulation housing in position on the pressure switch.
   (5) Remove the protective cover from the connector and connect the electrical connector 4000EL-A to the switch (20). Tighten the connector with your hand then use the PLIERS - ELECTRICAL, NOSE, RUBBER to tighten another 1/8 to 1/4 turn.
5. Close-up
Subtask 73-34-15-942-053-A ** ON A/C NOT FOR ALL
A. Close Access
   (1) Make sure that the work area is clean and clear of tools and other items.
   (2) Remove the WARNING NOTICE(S).
Subtask 73-34-15-865-064-A ** ON A/C NOT FOR ALL
B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):
PANELDESIGNATIONFINLOCATION
** ON A/C NOT FOR ALL
FOR FIN: 1000EM1 (ENGINE1)
49VUFUEL/LP VALVE/MOT1/ENG11QGA08
121VUFUEL/LP VALVE/MOT2/ENG13QGM25
FOR FIN: 1000EM2 (ENGINE2)
49VUFUEL/LP VALVE/MOT1/ENG22QGA09
121VUFUEL/LP VALVE/MOT2/ENG24QGM26
Subtask 73-34-15-710-051-A ** ON A/C NOT FOR ALL
C. Do a minimum idle check (Ref. AMM TASK 71-00-00-710-006) and a check for leaks.
Subtask 73-34-15-410-052-A ** ON A/C NOT FOR ALL
D. Close Access
   (1) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-040):
     (a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
     (b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
   (2) Remove the access platform(s).
Subtask 73-34-15-862-050-A ** ON A/C NOT FOR ALL
E. De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).
[Rev.10 from 2021] 2026.04.02 06:35:43 UTC
"WTRUIB" 2025