General Visual Inspection (GVI) of the Fuel Distribution System [PW11]

TASK 73-11-00-210-804-A
General Visual Inspection (GVI) of the Fuel Distribution System

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.

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

ZONE: 400

1. Reason for the Job
Use this procedure for a General Visual Inspection (GVI) of the fuel distribution system.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 1M(3 FT)

B. Work Zones and Access Panels

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

C. 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 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
General Visual Inspection (GVI) of the Fuel Distribution System
General Visual Inspection (GVI) of the Fuel Distribution System

3. Job Set-up
Subtask 73-11-00-941-057-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 73-11-00-010-061-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 73-11-00-040-055-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 73-11-00-010-062-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

CAUTION: WIPE CLEAN ALL PARTS AND TOOLS AS NECESSARY TO REMOVE UNWANTED DEBRIS AND PREVENT DAMAGE TO THE ENGINE.

Subtask 73-11-00-210-056-A ** ON A/C NOT FOR ALL

A. Do a General Visual Inspection (GVI) of the fuel distribution system as follows. See the Table 601 and the figures

General Visual Inspection (GVI) of the Fuel Distribution System ** ON A/C NOT FOR ALL

and

General Visual Inspection (GVI) of the Fuel Distribution System ** ON A/C NOT FOR ALL

(1) Examine the fuel supply tubes, manifolds, hydraulic fuel pressure and return tubes.
(2) Examine the fuel pressure tube (FH01) for clearance and chafing with the igniter cable. If the clearance is not in the specified limits, adjust the cable length through the spring clips to make more clearance with the tube.

Table 601 - GVI of the Engine Fuel Distribution System

EXAMINE	DAMAGE	DISPOSITION
Fuel system tubes	Cracks	Not permitted.
	Nicks, scratches, chafing and pitting	0.002 in. (0.05 mm) maximum depth permitted in all locations.
	Dents (without sharp edges or corners).	Permitted if the tubing Outside Diameter (OD) is not decreased by more than ten percent at each location. No dents permitted in 0.250 in. (6.35 mm) or less from the ferrule.
	Dents (with sharp edges or corners).	Not permitted.
	Pits or voids in the brazing or welding.	Not permitted. Replace the tube as necessary.
	Loose connections or external leaks.	Not permitted. Tighten or replace the tube as necessary.
Fuel system tubes, clamps and brackets	Worn or cracked clamp.	Not permitted. Replace the clamp.
	Loose hardware (unsecured clamps, cushion detached from the cushion clamp, loose fittings/B-nut, etc.). NOTE: Some fuel nozzle inlet threaded lengths are longer than others. Therefore, some fuel nozzles can have more threads that show than others. This condition is acceptable.	Not permitted.
Fuel manifold B-nuts at fuel nozzles	Flaking coke build up.	Not permitted. Replace as necessary.
	Cracks or dents.	Not permitted.
Fuel pressure tube (FH01)	Chafing	Visual indications of chafing between the tube (FH01) and igniter cable are not permitted.
	Clearance	The clearance between the tube (FH01) sections with no support and the igniter cable must be a minimum of 0.12 in. (3.05 mm).

(3) Do a visual inspection of the fuel system components for external fuel leaks and correct installation as follows:
(a) No external fuel leakage is permitted.
(b) No loosely attached components are permitted.

NOTE: Some fuel nozzle inlet threaded lengths are longer than others. Therefore, some fuel nozzles can have more threads that show than others. This condition is acceptable.

5. Close-up
Subtask 73-11-00-410-052-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 73-11-00-440-055-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 73-11-00-410-053-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 03:01:51 UTC