General Visual Inspection of the Fuel Distribution System for Contamination [PW11]

TASK 73-11-00-210-805-A
General Visual Inspection of the Fuel Distribution System for Contamination

WARNING: BE CAREFUL WHEN YOU DO WORK ON THE ENGINE AFTER SHUTDOWN. THE ENGINE CAN STAY HOT FOR A LONG TIME. IF YOU DO NOT OBEY THIS INSTRUCTION, INJURY CAN OCCUR.

1. Reason for the Job
Use this procedure to visually inspect the fuel distribution system for contamination and damage.
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	1	MAGNIFYING GLASS POWER 10X
No specific	Torque wrench: range to between 18 and 15 lbf.in (0.20 and 0.17 m.daN )
No specific	Torque wrench: range to between 44 and 38 lbf.in (0.50 and 0.43 m.daN )
No specific	Torque wrench: range to between 750 and 675 lbf.in (8.48 and 7.63 m.daN )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.P06-054)	Antigalling Compound

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL, 438AR, 451AL, 452AR
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL, 448AR, 461AL, 462AR

D. Referenced Information

REFERENCE	DESIGNATION
TASK 71-00-00-860-833-A	Procedure to Prevent Engine Motoring
TASK 71-13-00-010-802-A	Opening of the Fan Cowl Doors
TASK 71-13-00-410-802-A	Closing of the Fan Cowl Doors
TASK 73-11-00-281-801-A	Inspection of the Fuel Filter Element for Contamination
TASK 73-11-03-000-801-A	Removal of the Fuel Flow Divider
TASK 73-11-03-400-801-A	Installation of the Fuel Flow Divider
TASK 73-11-06-000-801-A	Removal of the Fuel Filter Element
TASK 73-11-06-400-801-A	Installation of the Fuel Filter Element
TASK 73-11-09-000-801-A	Removal of the Fuel Nozzles
TASK 73-11-09-400-801-A	Installation of the Fuel Nozzles
TASK 78-30-00-040-805-A	Deactivation of the Thrust Reverser System for Ground Maintenance
TASK 78-30-00-440-805-A	Reactivation of the Thrust Reverser System after Ground Maintenance
TASK 78-36-00-010-802-A	Opening of the Thrust Reverser Cowl-Doors
TASK 78-36-00-410-802-A	Closing of the Thrust Reverser Cowl-Doors
GVI Of The Fuel Distribution System For Contamination
Fuel Nozzle Filter Screen Limits
Fuel System Schematic

3. Job Set-up
Subtask 73-11-00-941-058-A ** ON A/C NOT FOR ALL

A. Safety Precautions
(1) Do the procedure to prevent engine motoring
(Ref. AMM TASK 71-00-00-860-833)

Subtask 73-11-00-010-063-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL 448AR
(2) Put an ACCESS PLATFORM 1M(3 FT) in position.

Subtask 73-11-00-040-056-A ** ON A/C NOT FOR ALL

C. Deactivation of the Thrust Reverser for Maintenance

WARNING: YOU MUST DEACTIVATE THE THRUST REVERSER BEFORE YOU DO WORK ON OR AROUND IT. IF YOU DO NOT, THE THRUST REVERSER CAN OPERATE ACCIDENTALLY AND CAUSE AN INJURY AND/OR DAMAGE.

(1) Do the deactivation of the thrust reverser system for maintenance (Ref. AMM TASK 78-30-00-040-805).

Subtask 73-11-00-010-064-A ** ON A/C NOT FOR ALL

D. Get Access
(1) Open the thrust reverser cowl-doors (Ref. AMM TASK 78-36-00-010-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
451AL 452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
461AL 462AR

4. Procedure

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

CAUTION: PUT BLANKING PLUGS ON ALL THE OPENINGS BEFORE YOU DO A REPAIR TO MAKE SURE THAT DUST WILL NOT GO INTO THE FUEL PASSAGES. IF YOU DO NOT OBEY THIS INSTRUCTION, DAMAGE TO THE EQUIPMENT CAN OCCUR.

Subtask 73-11-00-210-057-A ** ON A/C NOT FOR ALL

A. General Visual Inspection of the Fuel Distribution System for Contamination
(1) Remove the fuel filter element (Ref. AMM TASK 73-11-06-000-801).
(2) Inspect the fuel filter element (Ref. AMM TASK 73-11-00-281-801).
(3) If the fuel filter element does not have contamination or damage, continue to Step 4.A.(8).
(4) If the fuel filter element does have contamination or damage, do the steps that follow:
(a) Remove the fuel manifold (FM02) (1) if necessary.
1 Disconnect the fuel manifold (FM02) (1) from the fuel flow transmitter.
2 Remove the clamp (3) and shield (4) from the fuel manifold (FM02) (1).
3 Disconnect the fuel manifold (FM02) (1) from the fuel flow divider.
4 Remove the bolt (2) and clamp (5) from the fuel manifold (FM02) (1).
5 Remove the fuel manifold (FM02) (1).
(b) As an alternate method, remove the fuel flow divider (Ref. AMM TASK 73-11-03-000-801) and (Ref. AMM TASK 73-11-03-400-801).
(c) Visually examine the inlet of the fuel flow divider for contamination of the fuel flow divider strainer.

NOTE: The fuel flow divider strainer is a part of the fuel flow divider.

(d) If the fuel flow divider strainer does not have contamination, continue to Step 4.A.(6).
(5) If the fuel flow divider strainer does have contamination, do the steps that follow:
(a) Replace the fuel flow divider (Ref. AMM TASK 73-11-03-000-801) and (Ref. AMM TASK 73-11-03-400-801).
(b) Remove the No. 10 fuel nozzle (Ref. AMM TASK 73-11-09-000-801).

NOTE: The No. 10 fuel nozzle is closest to bottom dead center so is most likely to show signs of contamination. The No. 9 fuel nozzle can be used in place of the No. 10 fuel nozzle as it is in the same location but more difficult to access.

(c) Inspect the No. 10 fuel nozzle for contamination as follows:
1 Use a MAGNIFYING GLASS POWER 10X to visually check the fuel nozzle filter screens.
2 The flat surface of the fuel nozzle filter screen on the primary flow system can be no more than 25 percent blocked. Reject nozzles with more than 25 percent blockage.
3 Replace nozzles with more than 25 percent blockage (Ref. AMM TASK 73-11-09-000-801) and (Ref. AMM TASK 73-11-09-400-801).
4 The cup shaped fuel nozzle filter screen on the secondary system can have the flat bottom surface blocked less than 50 percent.
5 Replace nozzles that have the bottom surface covered with more than 50 percent material or the material is of substantial depth (enough to cover the bottom surface 50 percent) on the side walls in the fuel nozzle filter screen (Ref. AMM TASK 73-11-09-000-801) and (Ref. AMM TASK 73-11-09-400-801).
(d) If the No. 10 fuel nozzle shows no signs of contamination, continue to Step 4.A.(6).
(e) If the No. 10 fuel nozzle shows signs of contamination (even within acceptable limits as shown

Fuel Nozzle Filter Screen Limits ** ON A/C NOT FOR ALL

, do the steps that follow:

CAUTION: DO NOT TRY TO CLEAN THE FUEL NOZZLES. SUPPLIER PROPRIETARY CLEANING PROCESSES ARE NECESSARY TO CORRECTLY CLEAN THE INTERNAL PASSAGES OF THE FUEL NOZZLES WITHOUT DAMAGE.

1 Remove the remaining fuel nozzles (Ref. AMM TASK 73-11-09-000-801).
2 Inspect the remaining fuel nozzles. See Step 4.A.(5).(c).
3 Replace fuel nozzles as necessary.
(6) Find the possible sources of contamination in the fuel distribution system as follows:
(a) Inspect the Integrated Fuel Pump and Control (IFPC).
(b) Inspect the aircraft fuel supply.
(c) Check maintenance activity.
(d) Inspect the fuel flow transmitter.
(7) Correct the source of contamination.
(8) If removed, install the fuel flow divider (Ref. AMM TASK 73-11-03-400-801).
(9) If removed, install the fuel manifold (FM02) (1) as follows:
(a) Attach the fuel manifold (FM02) (1) to the fuel flow transmitter.
(b) Attach the fuel manifold (FM02) (1) to the fuel flow divider.
(c) Apply Antigalling Compound (Material No.P06-054) to the threads of the bolt (2).

NOTE: For new or refurbished bolts or nuts with baked on lubricant, do not do the wet application.

(d) Attach the fuel manifold (FM02) (1) to the bracket with the clamp (5) and bolt (2).
(e) TORQUE the fuel manifold (FM02) (1) at the fuel flow transmitter as follows:
1 TORQUE the B-nut to between 750 and 675 lbf.in (8.48 and 7.63 m.daN )

NOTE: Do not loosen the B-nut.

2 TORQUE the B-nut again to between 750 and 675 lbf.in (8.48 and 7.63 m.daN )

.
(f) TORQUE the fuel manifold (FM02) (1) at the fuel flow divider as follows:
1 TORQUE the B-nut to between 750 and 675 lbf.in (8.48 and 7.63 m.daN )

NOTE: Do not loosen the B-nut.

2 TORQUE the B-nut again to between 750 and 675 lbf.in (8.48 and 7.63 m.daN )

.
(g) TORQUE the bolt (2) to between 44 and 38 lbf.in (0.50 and 0.43 m.daN )

.
(h) Install the heat shield (4) to the fuel manifold (FM02) (1) with the clamp (3).
(i) TORQUE the clamp (3) to between 18 and 15 lbf.in (0.20 and 0.17 m.daN )

.
(10) If removed, install fuel nozzle(s) and other removed hardware (Ref. AMM TASK 73-11-09-400-801).
(11) Install the fuel filter element (Ref. AMM TASK 73-11-06-400-801).

5. Close-up
Subtask 73-11-00-410-054-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 thrust reverser cowl-doors (Ref. AMM TASK 78-36-00-410-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
451AL 452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
461AL 462AR

Subtask 73-11-00-440-056-A ** ON A/C NOT FOR ALL

B. Do the reactivation of the thrust reverser system after maintenance (Ref. AMM TASK 78-30-00-440-805).

Subtask 73-11-00-410-055-A ** ON A/C NOT FOR ALL

C. Close Access
(1) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL 448AR
(2) Remove the access platform(s).
(3) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 13:06:22 UTC