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

TASK 73-22-52-400-010-B
Installation 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 WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

WARNING: DO NOT GET THE FLUID ON YOUR SKIN OR IN YOUR EYES. IF YOU DO:

FLUSH IT AWAY WITH CLEAN WATER
GET MEDICAL AID.

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.

NOTE: The FMU fuel density adjuster is set during manufacture and must not be moved from this position.

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	VIBRO ENGRAVER
No specific	AR	WARNING NOTICE(S)
No specific	Torque wrench: range to between 44 and 36 lbf.in (0.50 and 0.41 m.daN )
No specific	Torque wrench: range to between 105 and 85 lbf.in (1.19 and 0.96 m.daN )
No specific	Torque wrench: range to between 110 and 90 lbf.in (1.24 and 1.02 m.daN )
No specific	Torque wrench: range to between 177 and 159 lbf.in (2.00 and 1.80 m.daN )
No specific	Torque wrench: range to between 231 and 189 lbf.in (2.61 and 2.14 m.daN )
No specific	Torque wrench: range to between 310 and 283 lbf.in (3.50 and 3.20 m.daN )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.V01-001)	cleaning fluid
(Material No.V02-126)	lockwire
(Material No.14SBA1)	Textile-Lint free Cotton -

C. 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

D. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
16	SEALING RING	AIPC 73-11-49-76-020
1	SEALING RING	AIPC 73-11-49-78-150
6	SEALING RING	AIPC 73-11-49-78-150
3	SEALING RING	AIPC 73-11-49-78-160
19	RING	AIPC 73-11-49-81-200
10	SEALING RING	AIPC 73-11-49-81-210
20	RING	AIPC 73-11-49-83-030
21	RING	AIPC 73-11-49-83-040
2	SEALING RING	AIPC 73-11-49-94-200
13	SEALING RING	AIPC 73-22-52-80-020

E. Referenced Information

REFERENCE	DESIGNATION
TASK 70-23-11-911-013-A	General Torque Tightening Techniques
TASK 70-23-13-911-010-A	Procedures for the Installation of Preformed Packings
TASK 70-23-15-912-010-A	Connection of Electrical Connectors
TASK 70-40-11-911-012-A	General Instructions for the Uses of Lockwire
TASK 71-00-00-710-012-B	Test No.3 : Idle Leak Check
TASK 71-00-00-710-046-B	Test No.2 : Wet Motor Leak Check
TASK 71-13-00-010-010-A	Opening of the Fan Cowls 437AL(447AL),438AR(448AR)
TASK 71-13-00-410-010-A	Closing of the Fan Cowls 437AL(447AL),438AR(448AR)
TASK 73-22-00-710-040-A	Operational Test of the FADEC SYSTEM on the Ground
TASK 80-13-51-710-040-B	Operational Test of the Pneumatic Starter Valve and FMU with the CFDS
Fuel Metering Unit
FMU Chart
Fuel Metering Unit
Fuel Metering Unit
Fuel Metering Unit
Fuel Metering Unit
PRE SBE 73-0049: Fuel Metering Unit
SBE 73-0049: Fuel Metering Unit
PRE SBE 73-0049: Fuel Metering Unit
SBE 73-0049: Fuel Metering Unit
Fuel Metering Unit

3. Job Set-up
Subtask 73-22-52-860-051-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 73-22-52-010-055-A ** ON A/C NOT FOR ALL

B. Make sure that the fan cowl doors are open (Ref. AMM TASK 71-13-00-010-010):
(1) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(2) FOR [1000EM2] (ENGINE-2)
447AL 448AR

Subtask 73-22-52-110-051-A ** ON A/C NOT FOR ALL

C. Clean Component
(1) Clean the FMU mounting pad on the LP/HP fuel pump.

Fuel Metering Unit ** ON A/C NOT FOR ALL

Use a Textile-Lint free Cotton - (Material No.14SBA1) made moist with cleaning fluid (Material No.V01-001)

4. Procedure
Subtask 73-22-52-420-051-A ** ON A/C NOT FOR ALL

CAUTION: DO NOT PUT FUEL THAT HAS BEEN DRAINED FROM THE ENGINE BACK IN TO THE FUEL SYSTEM.

A. Install the FMU on the LP/HP Fuel Pump

Fuel Metering Unit ** ON A/C NOT FOR ALL

FMU Chart ** ON A/C NOT FOR ALL

NOTE: Before installing the FMU, refer to the FMU compatibility chart to prevent the installation of an incorrect FMU.

NOTE: Before installing the FMU, make sure that the part number and manufacturer is the same as the removed FMU. If the part number and manufacturer are different, the engine configuration will change with new FMU and you must remark the engine data plate. Refer to service bulletins V2500-ENG-73-CN01 AND V2500-ENG-73-CN02 for remarking procedure.

NOTE: Install an attaching bolt (1) in the forward top mounting hole of the FMU before installing the FMU on the LP/HP fuel pump.

NOTE: Hold the weight of the FMU until all of the attaching bolts (1) are installed.

(1) Remove all covers and blanking caps from the openings.
(2) Install a new AIPC 73-22-52-80-020 SEALING RING (13) (Ref. AMM TASK 70-23-13-911-010) on to the FMU fuel inlet.

Fuel Metering Unit ** ON A/C NOT FOR ALL

(3) Install an attaching bolt (1) in the forward top mounting hole of the FMU.
(4) Install the FMU on the mounting pad of the LP/HP fuel pump.
(5) Install the remaining attaching bolts (1).
(6) TORQUE the bolts (1) to between 231 and 189 lbf.in (2.61 and 2.14 m.daN )

(Ref. AMM TASK 70-23-11-911-013).
(7) With new FMU you must remark the engine data plate. Use VIBRO ENGRAVER equipment to remark the engine data plate.

Subtask 73-22-52-420-054-A ** ON A/C NOT FOR ALL

B. Installation of the Fuel Tube (4)

Fuel Metering Unit ** ON A/C NOT FOR ALL

(1) Install new AIPC 73-11-49-83-030 RING (20) and AIPC 73-11-49-83-040 RING (21) on the fuel tube (4) (Ref. AMM TASK 70-23-13-911-010).
(2) Assemble the tube (4) with the FMU and the fuel flow transmitter.
(3) Assemble the bracket (11) in position on the tube (4) flange.
(4) Attach the tube (4) and the bracket (11) to the fuel flow transmitter with the bolts (12).
(5) Attach the tube (4) to the FMU with the bolts (3).
(6) TORQUE the bolts (3) and (12) to between 110 and 90 lbf.in (1.24 and 1.02 m.daN )

(Ref. AMM TASK 70-23-11-911-013).
(7) Put the clip, at detail C, in position on the tube (4).
(8) Attach the clip to the bracket (11) with the bolt (9), the washer (8) and the nut (7).
(9) Put the clip, at detail B, in position on the tube (4).
(10) Attach the clip to the bracket with the bolt (6) and the washer (5).
(11) TORQUE the bolt (6) and the nut (7) to between 44 and 36 lbf.in (0.50 and 0.41 m.daN )

(Ref. AMM TASK 70-23-11-911-013).

Subtask 73-22-52-420-055-A ** ON A/C NOT FOR ALL

C. Connection of Fuel Tubes

Fuel Metering Unit ** ON A/C NOT FOR ALL

(1) Install the fuel tube (18):
(a) Assemble the tube (18) with the FMU and the LP/HP fuel pump.
(b) Connect the tube (18) union nut to the fuel pump.
(c) Connect the tube (18) union nut to the FMU.
(d) TORQUE the union nuts to between 177 and 159 lbf.in (2.00 and 1.80 m.daN )

(Ref. AMM TASK 70-23-11-911-013).
(e) Safety the union nuts with lockwire (Material No.V02-126) (Ref. AMM TASK 70-40-11-911-012).
(2) Install the fuel tube (5):

Fuel Metering Unit ** ON A/C NOT FOR ALL

(a) Install a new AIPC 73-11-49-78-150 SEALING RING (1) (Ref. AMM TASK 70-23-13-911-010) on the seal housing (2).
(b) Assemble the seal housing (2) on the fuel diverter and return valve. Make sure that the bolt holes are aligned.
(c) Install a new AIPC 73-11-49-78-160 SEALING RING (3) and AIPC 73-11-49-78-150 SEALING RING (6) (Ref. AMM TASK 70-23-13-911-010) on the tube (5).
(d) Assemble the tube (5) on the FMU and the seal housing (2) on the fuel diverter and return valve.
(e) Put the bracket (7) in position on the tube (5) flange.
(f) Attach the tube (5) and the bracket (7) to the FMU with the bolts (8).
(g) Attach the tube (5) to the seal housing (2) and the fuel diverter and return valve with the bolts (4).
(h) TORQUE the bolts (4) and (8) to between 110 and 90 lbf.in (1.24 and 1.02 m.daN )

(Ref. AMM TASK 70-23-11-911-013).
(i) Assemble the clips at detail K. Attach the clips to the lug with the bolt (54), the washers (55) and (57), the spacer (56) and the nut (58).
(j) Assemble the clips at detail J. Attach the clips to the bracket with the bolt (50), the washer (51) and the spacers (52) and (53).
(k) Assemble the clip at detail H. Attach the clip to the lug with the bolt (40), the washer (41) and the nut (42).
(l) Assemble the clips at detail G. Attach the clips to the lug with the bolt (34), the washers (35) and (38), the spacers (36) and (37) and the nut (39).

PRE SBE 73-0235

(m) Assemble the clip at detail F. Attach the clip to the bracket with the bolt (32) and the washer (33).

END OF PRE SBE 73-0235

POST SBE 73-0235

(n) Assemble the clip at detail F. Attach the clips to the bracket with the bolt (32) and spacer (75).

END OF POST SBE 73-0235

(o) TORQUE the nuts (39), (42) and (58) and the bolts (32) and (50) to between 44 and 36 lbf.in (0.50 and 0.41 m.daN )

(Ref. AMM TASK 70-23-11-911-013).
(3) Install the fuel tube (14):

Fuel Metering Unit ** ON A/C NOT FOR ALL

PRE SBE 73-0049: Fuel Metering Unit ** ON A/C NOT FOR ALL

SBE 73-0049: Fuel Metering Unit ** ON A/C NOT FOR ALL

PRE SBE 73-0049: Fuel Metering Unit ** ON A/C NOT FOR ALL

SBE 73-0049: Fuel Metering Unit ** ON A/C NOT FOR ALL

Fuel Metering Unit ** ON A/C NOT FOR ALL

(a) Install a new AIPC 73-11-49-76-020 SEALING RING (16) (Ref. AMM TASK 70-23-13-911-010) on the tube (14).
(b) Assemble the tube (14) with the FMU (1) and the tubes (11), (12) and (13).
(c) Attach the tube (14) to the FMU (1) with the bolts (15).
(d) Connect the tube (11) union nut to the tube (14) disconnect.
(e) Connect the tube (12) union nut to the tube (14) disconnect.
(f) Connect the tube (13) union nut to the tube (14) disconnect.
(g) TORQUE the bolts (15) to between 110 and 90 lbf.in (1.24 and 1.02 m.daN )

(Ref. AMM TASK 70-23-11-911-013).
(h) TORQUE the tube (11) union nut to between 310 and 283 lbf.in (3.50 and 3.20 m.daN )

(Ref. AMM TASK 70-23-11-911-013).
(i) TORQUE the tube (12) and the tube (13) union nuts to between 177 and 159 lbf.in (2.00 and 1.80 m.daN )

(Ref. AMM TASK 70-23-11-911-013).
(j) Safety the union nuts with lockwire (Material No.V02-126) (Ref. AMM TASK 70-40-11-911-012).
(k) Assemble the clips at detail K. Attach the clips with the bolt (35), the washers (36) and (37) and the nut (38).
(l) Assemble the clip at detail J. Attach the clip to the bracket with the bolt (33) and the washers (34).
(m) Assemble the clip at detail P. Attach the clip to the bracket with the bolt (56) and the washer (57).
(n) TORQUE the nut (38) and the bolts (33) and (56) to between 44 and 36 lbf.in (0.50 and 0.41 m.daN )

(Ref. AMM TASK 70-23-11-911-013).
(4) Install the fuel tube (9):

Fuel Metering Unit ** ON A/C NOT FOR ALL

(a) Assemble the tube (9) with the FMU (1) and the tube (10) disconnect.
(b) Connect the tube (9) union nut to the FMU (1).
(c) Connect the tube (9) union nut to the tube (10) disconnect.
(d) TORQUE the tube (9) union nuts to between 177 and 159 lbf.in (2.00 and 1.80 m.daN )

(Ref. AMM TASK 70-23-11-911-013).
(e) Safety the union nuts with lockwire (Material No.V02-126) (Ref. AMM TASK 70-40-11-911-012).
(5) Install the fuel tube (7):

Fuel Metering Unit ** ON A/C NOT FOR ALL

(a) Install a new AIPC 73-11-49-94-200 SEALING RING (2) (Ref. AMM TASK 70-23-13-911-010) on the tube (7).
(b) Assemble the tube (7) with the FMU (1) and the tube (8) disconnect.
(c) Attach the tube (7) to the FMU (1) with the bolts (3).
(d) Connect the tube (7) union nut to the tube (8) disconnect.
(e) TORQUE the bolts (3) to between 105 and 85 lbf.in (1.19 and 0.96 m.daN )

(Ref. AMM TASK 70-23-11-911-013).
(f) TORQUE the tube (7) union nut to between 310 and 283 lbf.in (3.50 and 3.20 m.daN )

(Ref. AMM TASK 70-23-11-911-013).
(g) Safety the union nuts with lockwire (Material No.V02-126) (Ref. AMM TASK 70-40-11-911-012).

Subtask 73-22-52-410-052-A ** ON A/C NOT FOR ALL

D. Installation of the Fuel Tube (17)

Fuel Metering Unit ** ON A/C NOT FOR ALL

(1) Install new AIPC 73-11-49-81-210 SEALING RING (10) and AIPC 73-11-49-81-200 RING (19) (Ref. AMM TASK 70-23-13-911-010) on the tube (17).
(2) Assemble the tube (17) on the LP/HP fuel pump and the LP fuel filter.
(3) Attach the tube (17) to the LP/HP fuel pump with the bolts (11).
(4) Assemble the bracket (15) in position on the tube (17) flange.
(5) Attach the tube (17) and the bracket (15) to the LP fuel filter with the bolts (12) and (13), and the washers (14).
(6) TORQUE the bolts (11), (12) and (13) to between 110 and 90 lbf.in (1.24 and 1.02 m.daN )

(Ref. AMM TASK 70-23-11-911-013).
(7) Assemble the clips, at detail E. Attach the clips with the bolt (31) and the washer (30).
(8) TORQUE the bolt (31) to between 44 and 36 lbf.in (0.50 and 0.41 m.daN )

(Ref. AMM TASK 70-23-11-911-013).

Subtask 73-22-52-420-056-A ** ON A/C NOT FOR ALL

E. Install the Harness Raceway (17)

Fuel Metering Unit ** ON A/C NOT FOR ALL

SBE 73-0049: Fuel Metering Unit ** ON A/C NOT FOR ALL

PRE SBE 73-0049: Fuel Metering Unit ** ON A/C NOT FOR ALL

Fuel Metering Unit ** ON A/C NOT FOR ALL

PRE SBE 73-0049
(1) Assemble the raceway and clips at detail L. Attach the raceway and clips to the bracket with the bolt (39), the washer (40) and the spacer (41).
SBE 73-0049
(2) Assemble the raceway and clips at detail L. Attach the raceway and clips to the bracket with the bolt (39), the washer (40), the spacer (41) and the spacer (42).
(3) Assemble the raceway and clip at detail R. Attach the clip to the bracket with the bolt (70) and the washer (71).
(4) Assemble the clip at detail H. Attach the clip to the raceway lug with the bolt (32), the washer (31) and the nut (30).
(5) TORQUE the nut (30) and the bolts (39) and (70) to between 44 and 36 lbf.in (0.50 and 0.41 m.daN )

(Ref. AMM TASK 70-23-11-911-013).

Subtask 73-22-52-420-057-A ** ON A/C NOT FOR ALL

F. Connect the Electrical Harness (Ref. AMM TASK 70-23-15-912-010)

Fuel Metering Unit ** ON A/C NOT FOR ALL

PRE SBE 73-0049: Fuel Metering Unit ** ON A/C NOT FOR ALL

SBE 73-0049: Fuel Metering Unit ** ON A/C NOT FOR ALL

(1) Connect the electrical connectors (4), (5) and (6), at details B, C and D, to the FMU (1).
(2) Tighten the connectors.
(3) Assemble the clip at detail M. Attach the clip to the lug with the bolt (50), the washer (51) and the nut (52).
(4) Assemble the clip at detail N. Attach the clip to the raceway lug with the bolt (53), the washer (54) and the nut (55).
PRE SBE 73-0049
(5) Assemble the clips at detail Q. Attach the clip to the raceway lug with the bolt (58), the washer (59) and the nut (60).
SBE 73-0049
(6) Assemble the clips at detail Q. Attach the clips to the raceway lug with the bolt (58), the washer (59), the spacer (60) and the nut (61).
(7) TORQUE the nuts (52), (55) and (60) or (61) to between 44 and 36 lbf.in (0.50 and 0.41 m.daN )

(Ref. AMM TASK 70-23-11-911-013).

5. Close-up
Subtask 73-22-52-410-053-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) Close the fan cowls (Ref. AMM TASK 71-13-00-410-010):
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(3) Remove the WARNING NOTICE(S).

Subtask 73-22-52-790-051-A ** ON A/C NOT FOR ALL

B. Test requirements
(1) Do the operational test of the starter valve and FMU (Ref. AMM TASK 80-13-51-710-040).
(2) Do an operational test of the FADEC (Ref. AMM TASK 73-22-00-710-040) and make sure that, on the CFDS, no fault is shown related to the Fuel Metering Unit.
(3) Do an idle leak check (Ref. AMM TASK 71-00-00-710-012).

NOTE: A wet motor leak check (Ref. AMM TASK 71-00-00-710-046) may be used to check for leaks, but this must be followed by an idle leak check (Ref. AMM TASK 71-00-00-710-012).

[Rev.10 from 2021] 2026.04.01 03:01:25 UTC