W DOC AIRBUS | AMM A320F

Removal of the Fuel Metering Unit (FMU) [IAE]

TASK 73-22-52-000-010-B
Removal of the Fuel Metering Unit (FMU)

WARNING: BE CAREFUL WHEN YOU DO WORK ON THE ENGINE PARTS AFTER THE ENGINE SHUTDOWN. USE APPLICABLE THERMAL GLOVES. THE ENGINE PARTS CAN STAY HOT FOR ONE HOUR AFTER SHUTDOWN AND CAN BURN YOU.
WARNING: BE CAREFUL NOT TO GET AIRCRAFT FUEL IN YOUR MOUTH OR IN YOUR EYES. IF YOU GET FUEL ON YOUR SKIN OR ON YOUR CLOTHES, FLUSH IT IMMEDIATELY WITH WATER. IF NECESSARY, GET MEDICAL HELP. AIRCRAFT FUEL IS POISONOUS.
WARNING: BE CAREFUL DURING REMOVAL/INSTALLATION OF THE FMU IT WEIGHS 20LB (9KG).
CAUTION: DO NOT LET ENGINE OIL FALL ON THE ENGINE. UNWANTED OIL MUST BE REMOVED IMMEDIATELY WITH A CLEAN LINT FREE CLOTH THE OIL CAN CAUSE DAMAGE TO THE SURFACE PROTECTION AND TO SOME PARTS.
ZONE: 400
FIN: 4000KC ** 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
CONTAINER 5 L (1.32 USGAL)
No specific
AR
COVER - BLANKING
No specific
AR
WARNING NOTICE(S)
 B. Work Zones and Access Panels
ZONE/ACCESS
ZONE DESCRIPTION
400
POWER PLANT, NACELLES AND PYLONS
FOR [1000EM1] (ENGINE-1)
437AL, 438AR
FOR [1000EM2] (ENGINE-2)
447AL, 448AR
 C. Referenced Information
REFERENCE
DESIGNATION
TASK 71-13-00-010-010-A
Opening of the Fan Cowls 437AL(447AL),438AR(448AR)
F Fuel Metering Unit
F PRE SBE 73-0049: Fuel Metering Unit
F SBE 73-0049: Fuel Metering Unit
F PRE SBE 73-0049: Fuel Metering Unit
F Fuel Metering Unit
F SBE 73-0049: Fuel Metering Unit
F Fuel Metering Unit
F Fuel Metering Unit
F Fuel Metering Unit
F Fuel Metering Unit
3. Job Set-up
Subtask 73-22-52-941-051-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 73-22-52-010-052-A ** ON A/C NOT FOR ALL
B. Open the fan cowls (Ref. AMM TASK 71-13-00-010-010):
   (1) FOR [1000EM1] (ENGINE-1)
437AL 438AR
   (2) FOR [1000EM2] (ENGINE-2)
447AL 448AR
4. Procedure
Subtask 73-22-52-020-055-A ** ON A/C NOT FOR ALL
A. Disconnect the Electrical Harness
F Fuel Metering Unit ** ON A/C NOT FOR ALL
F PRE SBE 73-0049: Fuel Metering Unit ** ON A/C NOT FOR ALL
F SBE 73-0049: Fuel Metering Unit ** ON A/C NOT FOR ALL
   (1) Remove the nut (52), the washer (51) and the bolt (50) which attach the clip, at detail M.
   (2) Remove the nut (55), the washer (54) and the bolt (53) which attach the clip, at detail N.
PRE SBE 73-0049
   (3) Remove the nut (60), the washer (59) and the bolt (58) which attach the clips, at detail Q.
SBE 73-0049
   (4) Remove the nut (61), the spacer (60), the washer (59) and the bolt (58) that attach the clips at detail Q.
   (5) Disconnect the electrical connectors (4), (5) and (6) at details B, C and D from the FMU (1).
Subtask 73-22-52-020-056-A ** ON A/C NOT FOR ALL
B. Remove the Harness Raceway (17)
F Fuel Metering Unit ** ON A/C NOT FOR ALL
F PRE SBE 73-0049: Fuel Metering Unit ** ON A/C NOT FOR ALL
F Fuel Metering Unit ** ON A/C NOT FOR ALL
F SBE 73-0049: Fuel Metering Unit ** ON A/C NOT FOR ALL
F SBE 73-0049: Fuel Metering Unit ** ON A/C NOT FOR ALL
   (1) Remove the nut (30), the washer (31) and the bolt (32), which attach the clip, at detail H.
   (2) Remove the bolt (70) and the washer (71) which attach the clip, at detail R.
PRE SBE 73-0049
   (3) Remove the bolt (39), the washer (40) and the spacer (41), which attach the clips and raceway, at detail L. Remove the raceway.
SBE 73-0049
   (4) Remove the bolt (39), the washer (40), the spacer (41) and the spacer (42) that attach the clips and raceway, at detail L. Remove the raceway.
Subtask 73-22-52-010-053-A ** ON A/C NOT FOR ALL
C. Removal of the Fuel Tube (17) for Access
F Fuel Metering Unit ** ON A/C NOT FOR ALL
F Fuel Metering Unit ** ON A/C NOT FOR ALL
   (1) Remove the bolt (31) and the washer (30) which attach the clips, at detail E.
   (2) Remove the bolts (12) and (13), and the washers (14) which attach the tube (17) and the bracket (15) to the LP fuel filter. Remove the bracket (15).
   (3) Remove the bolts (11) which attach the tube (17) to the LP/HP fuel pump.
   (4) Remove the tube (17).
   (5) Remove and discard the sealing rings (10) and (19).
Subtask 73-22-52-020-057-A ** ON A/C NOT FOR ALL
D. Disconnection of Fuel Tubes
   (1) Remove the fuel tube (7):
F Fuel Metering Unit ** ON A/C NOT FOR ALL
     (a) Put the CONTAINER 5 L (1.32 USGAL) in to position to catch all the fuel which drains from the fuel tubes and the Fuel Metering Unit (FMU).
     (b) Cut and remove the lockwire from the tube (7) union nut and the tube (8) disconnect.
     (c) Disconnect the tube (7) union nut from the tube (8).
     (d) Remove the bolts (3) which attach the tube (7) to the FMU (1).
     (e) Remove the tube (7).
     (f) Remove and discard the sealing ring (2).
   (2) Remove the fuel tube (9):
F Fuel Metering Unit ** ON A/C NOT FOR ALL
     (a) Cut and remove the lockwire from the tube (9) union nut and the FMU (1) disconnect.
     (b) Cut and remove the lockwire from the tube (10) union nut and tube (9) disconnect.
     (c) Disconnect the tube (10) union nut from the tube (9).
     (d) Disconnect the tube (9) union nut from the FMU (1).
     (e) Remove the tube (9).
   (3) Remove the fuel tube (14):
F Fuel Metering Unit ** ON A/C NOT FOR ALL
F PRE SBE 73-0049: Fuel Metering Unit ** ON A/C NOT FOR ALL
F PRE SBE 73-0049: Fuel Metering Unit ** ON A/C NOT FOR ALL
F Fuel Metering Unit ** ON A/C NOT FOR ALL
F SBE 73-0049: Fuel Metering Unit ** ON A/C NOT FOR ALL
     (a) Remove the bolt (56) and the washer (57) which attach the clip, at detail P.
     (b) Remove the bolt (33) and the washer (34) which attach the clip, at detail J.
     (c) Remove the nut (38), the washers (37) and (36), and the bolt (35) which attach the clips, at detail K.
     (d) Cut and remove the lockwire from the unions between tubes (11) and (14), between tubes (12) and (14) and between tubes (13) and (14).
     (e) Disconnect the union nut on the tube (11) from the tube (14).
     (f) Disconnect the union nut on the tube (12) from the tube (14).
     (g) Disconnect the union nut on the tube (13) from the tube (14).
     (h) Remove the bolts (15), which attach the tube (14) to the FMU (1).
     (i) Remove the tube (14).
     (j) Remove and discard the sealing ring (16).
   (4) Remove the fuel tube (5):
F Fuel Metering Unit ** ON A/C NOT FOR ALL
F Fuel Metering Unit ** ON A/C NOT FOR ALL
F Fuel Metering Unit ** ON A/C NOT FOR ALL

PRE SBE 73-0235

     (a) Remove the bolt (32) and the washer (33) which attach the clip, at detail F.

END OF PRE SBE 73-0235

POST SBE 73-0235

     (b) Remove the bolt (32) and the spacer (75) which attach the clip, at detail F.

END OF POST SBE 73-0235

     (c) Remove the nut (39), the washers (38) and (35), the spacers (37) and (36), and the bolt (34) which attach the clips, at detail G.
     (d) Remove the nut (42), the washer (41) and the bolt (40) which attach the clip, at detail H.
     (e) Remove the bolt (50), the washer (51) and the spacers (52) and (53) which attach the clips, at detail J.
     (f) Remove the nut (58), the washers (57) and (55), the spacer (56) and the bolt (54) which attach the clips, at detail K.
     (g) Remove the bolts (8), which attach the tube (5) and the bracket (7) to the FMU. Remove the bracket.
     (h) Remove the bolts (4), which attach the tube (5) and seal housing (2) to the fuel diverter and return valve. Remove the tube and the seal housing.
     (i) Remove and discard the sealing rings (1), (3) and (6).
   (5) Remove the fuel tube (18):
F Fuel Metering Unit ** ON A/C NOT FOR ALL
     (a) Cut and remove the lockwire from the union nuts at each end of the tube (18).
     (b) Disconnect the tube (18) union nuts from the FMU and the LP/HP fuel pump.
     (c) Remove the tube (18).
Subtask 73-22-52-020-058-A ** ON A/C NOT FOR ALL
E. Removal of the Fuel Tube (4)
F Fuel Metering Unit ** ON A/C NOT FOR ALL
   (1) Remove the bolt (6) and the washer (5) which attach the clip, at detail B.
   (2) Remove the bolt (9), the washer (8) and the nut (7) which attach the clip, at detail C.
   (3) Remove the bolts (3) which attach the tube (4) to the FMU.
   (4) Remove the bolts (12) which attach the tube (4) and the bracket (11) to the fuel flow transmitter. Remove the tube (4) and the bracket (11).
   (5) Remove and discard the sealing rings (20) and (21).
Subtask 73-22-52-020-051-A ** ON A/C NOT FOR ALL
F. Removal of the FMU
F Fuel Metering Unit ** ON A/C NOT FOR ALL
NOTE: Hold the weight of the FMU before you remove the attaching bolts.
   (1) Hold the weight of the FMU and remove the bolts (1) that attach the FMU to the LP/HP fuel pump.
   (2) Remove the FMU.
   (3) Remove the sealing ring (13) and discard it.
   (4) Install the COVER - BLANKING on all the exposed openings.
   (5) In the event of shipping or prolonged storage, preserve the FMU in the shop.
   (6) Remove the container and discard the drained fuel.
[Rev.10 from 2021] 2026.04.01 03:01:24 UTC
"Aviabrain" 2025