Installation of the Fuel Metering Unit (FMU) Fuel Strainer [CFML]

TASK 73-11-15-400-801-A
Installation of the Fuel Metering Unit (FMU) Fuel Strainer

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.

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 1M(3 FT)
No specific	AR	WARNING NOTICE(S)
No specific	Torque wrench: range to between 87 and 73 lbf.in (0.98 and 0.82 m.daN )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.CP2101)	graphite grease
(Material No.CP2442)	engine oil

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL, 438AR
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL, 448AR

D. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
7	PREFORMED PACKING	EIPC 73-21-05-01-030
8	PREFORMED PACKING	EIPC 73-21-05-01-040

E. Referenced Information

REFERENCE	DESIGNATION
TASK 71-00-00-700-805-A	Dry-Motoring Check
TASK 71-13-00-010-803-A	Opening of the Fan Cowl Doors
TASK 71-13-00-410-803-A	Closing of the Fan Cowl Doors
TASK 73-11-15-200-801-A	Visual Inspection of the Fuel Metering Unit (FMU) Fuel Strainer
FMU Fuel Strainer

3. Job Set-up
Subtask 73-11-15-941-051-A

A. Safety Precautions
(1) On the center pedestal, on ENG panel 115VU:
(a) Make sure that the ENG/MODE selector switch is in the NORM position.
(b) Make sure that the ENG/MASTER 1(2) control switch was in the OFF position not less than five minutes before you do this procedure.
(c) Make sure that the WARNING NOTICE(S) are in position to tell persons not to operate:

The ENG/MODE selector switch, and
The ENG/MASTER 1(2) control switch.

(2) On the ENG section of maintenance panel 50VU:
(a) Make sure that the ON legend of the FADEC GND PWR/1(2) pushbutton switch is off.
(b) Make sure that the WARNING NOTICE(S) is in position to tell persons not to energize FADEC 1(2).

Subtask 73-11-15-010-051-A

B. Get Access
(1) Make sure that the fan cowl doors are open (Ref. AMM TASK 71-13-00-010-803):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL 448AR
(2) Make sure that the ACCESS PLATFORM 1M(3 FT) is in position.

4. Procedure
Subtask 73-11-15-210-050-A

A. Do an inspection of the FMU fuel strainer (Ref. AMM TASK 73-11-15-200-801).

Subtask 73-11-15-420-050-A

B. Installation of the FMU Fuel Strainer
(1) Remove all the COVER - PROTECTION and CAP - PROTECTION from the openings, tubes, hoses and connectors.
(2) Lubricate the new preformed packing (7) and the new preformed packing (8) with engine oil (Material No.CP2442) .
(3) Install the new EIPC 73-21-05-01-030 PREFORMED PACKING (7) and the new EIPC 73-21-05-01-040 PREFORMED PACKING (8) in the packing grooves on the FMU fuel strainer (4).
(4) Apply graphite grease (Material No.CP2101) on the threads and under the heads of the bolts (6).
(5) Ensure that the alignment features on the fuel strainer (4) and the FMU (1) housing are aligned, then apply firm hand pressure to seal it.

NOTE: To avoid damage to the FMU fuel strainer, it is important to make sure that it is correctly aligned and seated in the FMU housing before tightening the four bolts. The correct alignment and seating is indicated by 360-degree contact/engagement of the preformed packings with little or no visible gap between the strainer flange and the mating surface of the housing.

(6) Install the four bolts (6) and the four washers (5) and tighten hand-tight until they are seated.
(a) TORQUE the four bolts (6) to between 87 and 73 lbf.in (0.98 and 0.82 m.daN )

5. Close-up
Subtask 73-11-15-710-050-A

A. Tests
(1) Do a dry-motoring check (Ref. AMM TASK 71-00-00-700-805).

Subtask 73-11-15-410-050-A

B. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-803):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL 448AR
(3) Remove the access platform(s).
(4) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 03:03:58 UTC