Removal of the Downstream Filter [CFMI]

TASK 73-11-45-000-040-A
Removal of the Downstream Filter

1. Reason for the Job

NOTE: This task is only applicable POST SB CFM 73-149

2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [1000EM1] (ENGINE-1)
437AL, 438AR, 451AL, 452AR
FOR [1000EM2] (ENGINE-2)
447AL, 448AR, 461AL, 462AR

C. Referenced Information

REFERENCE	DESIGNATION
TASK 71-13-00-010-040-A	Opening of the Fan Cowl Doors
TASK 78-30-00-481-041-A	Make the Thrust Reverser Unserviceable for Maintenance
TASK 78-36-00-010-040-A	Opening of the Thrust Reverser Doors
R/I Downstream Filter

3. Job Set-up
Subtask 73-11-45-941-054-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 73-11-45-010-060-A ** ON A/C NOT FOR ALL

B. Open the fan cowl doors: (Ref. AMM TASK 71-13-00-010-040)
(1) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(2) FOR [1000EM2] (ENGINE-2)
447AL 448AR

Subtask 73-11-45-040-056-A ** ON A/C NOT FOR ALL

C. Make the thrust reverser unserviceable (Ref. AMM TASK 78-30-00-481-041).

Subtask 73-11-45-010-061-A ** ON A/C NOT FOR ALL

D. Open the thrust reverser doors: (Ref. AMM TASK 78-36-00-010-040)
(1) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(2) FOR [1000EM2] (ENGINE-2)
461AL 462AR

4. Procedure
Subtask 73-11-45-020-053-A ** ON A/C NOT FOR ALL

A. Removal of the Fuel Nozzle Filter
(1) Disconnect the fuel out hose (10) from the servo fuel heater.
(2) Disconnect the fuel HPTACC hose (20).
(3) Disconnect the fuel LPTACC hose (30).
(4) Remove the 4 bolts (40) which attach the fuel hose/tube (60) to the fuel inlet port of the fuel nozzle filter (120). Remove and discard the gasket (50).
(5) Remove the 4 bolts (70) which attach the fuel tube (90) to the fuel outlet port of the fuel nozzle filter (120). Remove and discard the gasket (80).
(6) Remove the 3 nuts (110), the 3 washers (130) and 3 bolts (100).
(7) Remove the fuel nozzle filter (120).

[Rev.10 from 2021] 2026.04.01 02:55:34 UTC