General Visual Inspection (GVI) of the Engine and Pylon Drain System [PW11]

TASK 71-71-00-210-801-A
General Visual Inspection (GVI) of the Engine and Pylon Drain 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.

CAUTION: YOU MUST ADJUST ALL TUBES WITH LESS THAN 0.125 INCH (3.175 MM) CLEARANCE TO ADJACENT TUBES OR PARTS. TUBES WITH LESS CLEARANCE CAN CHAFE DURING ENGINE OPERATION. THIS CAN CAUSE A LEAK AND A POSSIBLE IN-FLIGHT SHUTDOWN.

ZONE: 400

1. Reason for the Job
Use this procedure to visually inspect the engine and pylon drain system external parts for damage (nicks, dents, pitting, corrosion and scratches), correct attachment, correct clearance and leakage.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE
No specific	1	CLOTH-CROCUS

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 72-21-08-000-801-A	Removal of the Fan Exit Liner Segments
TASK 72-21-08-400-801-A	Installation of the Fan Exit Liner Segments
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
Engine and Pylon Drain System
Engine and Pylon Drain System
Engine and Pylon Drain System - Scupper Drain Tubes
Engine and Pylon Drain System - Gearbox Breather Tube (LB60)

3. Job Set-up
Subtask 71-71-00-941-051-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 71-71-00-010-052-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 2M (6 FT) - ADJUSTABLE in position.

Subtask 71-71-00-040-051-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 71-71-00-010-053-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
(2) Remove the fan exit liner segment a 6 o'clock location (Ref. AMM TASK 72-21-08-000-801) to get access to FB01 tube.

4. Procedure
Subtask 71-71-00-210-050-A ** ON A/C NOT FOR ALL

A. General Visual Inspection (GVI) of the Engine and Pylon Drain System
(1) Do a visual inspection of the engine and pylon drain tubes to make sure that there is a 0.125 in. (3.17 mm) minimum clearance with the adjacent tubes or parts. If the clearance is less than 0.125 in. (3.17 mm), do the steps that follow:
(a) Loosen all the clamp bolts and/or brackets at all the support points along the tube length.
(b) Loosen all the tube fittings.
(c) Adjust the tube and clamps to get the 0.125 in. (3.17 mm) minimum clearance with the adjacent tubes or parts.
(d) Tighten all the clamp bolts and/or brackets.
(e) Tighten all the tube fittings.
(f) Check the tubes that were adjusted for leaks.
(2) Do a visual inspection of the engine pylon and drain tubes to make sure that they are attached correctly at all the support locations as follows:
(a) Replace all the worn or damaged clamps.
(b) Tighten all the loose clamp bolts and/or brackets at all the support points along the tube length.
(c) Tighten all the loose tube fittings.
(3) Do a visual inspection of the engine and pylon drain system tube connections for leaks and loose connections as follows:
(a) Examine the tube-to-tube connections.
(b) Examine the tube or manifold-to-component connections.
(c) Examine the tube-to-boss connections.
(d) No leaks or loose connections are permitted.
Table 1 - Inspect the Engine and Pylon Drain System

EXAMINE	DAMAGE	DISPOSITION
Engine and pylon drain system tubes and drain hose assemblies (does not include the fire sleeves) for:
Cracks	All quantities, all locations	Not permitted. Replace the tube.
Corrosion and stains	All quantities, all locations	Permitted, if it can be removed by light polish with a CLOTH-CROCUS.
	Heavy corrosion that can not be removed by light polish	Not permitted. Replace the tube.
Nicks, scratches, chafing and pits	All quantities 0.002 in. (0.05 mm) maximum depth, all locations	Permitted
	All quantities more than the permitted limits	Not permitted. Replace the tube.
Dents	All dents that do not have sharp edges or corners	Permitted if the tube Outer Diameter (OD) is not decreased by more than ten percent at each location.
	All dents that have sharp edges or corners	Not permitted. Replace the tube.
	Dents located 0.250 in. (6.35 mm) or less from the ferrule	Not permitted. Replace the tube.
Correct attachment at all support locations	All worn, damaged or loose clamps, all locations	Not permitted. Replace all worn or damaged clamps, tighten all loose clamps, all loose attachment bolts and nuts for the full length of the tube or hose.
Fuel system tubes, drain hose assembly connections, case boss connections and components for:
Loose connections	All quantities, all locations	Not permitted. Tighten all loose connections as necessary.
Leaks	All quantities, all locations	Not permitted. Tighten the loose tube nut or replace the tube or hose.
Engine and pylon drain hose assembly fire sleeves for:
Cracks and heat blisters	All quantities, all locations	Not permitted. Replace the tube assembly.
Exposure to fire or too much heat that is indicated by wire or fitting discoloration, pitting or distortion	All quantities, all locations	Not permitted. Replace the tube assembly.
Damage to the white fiberglass braid	All quantities, all locations	Not permitted. Replace the tube assembly.
Gouge damage	A 0.030 in. (0.76 mm) maximum depth, 1.0 in.2 (645.16 mm2) maximum area and does not damage the white fiberglass braid	Permitted
Cut or tear damage	A 0.250 in.2 (161.29 mm2) maximum area and does not damage the white fiberglass braid	Permitted
Flap damage	A 1.0 in. (25.40 mm) maximum for each side for a maximum of three sides and does not damage the white fiberglass braid	Permitted
Slit damage	A 3.0 in. (76.20 mm) maximum axially or 0.250 in. (6.35 mm) maximum perpendicular to the hose axis and does not cause damage to the white fiberglass braid	Permitted

(4) Examine the assembly for foreign objects, damage and correct assembly.

5. Close-up
Subtask 71-71-00-410-052-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) Install the fan exit liner segment at 6 o'clock location (Ref. AMM TASK 72-21-08-400-801).
(3) 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 71-71-00-440-051-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 71-71-00-410-053-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 12:57:11 UTC