General Visual Inspection of the Engine Hydraulic Tubes and Hoses

TASK 29-11-49-210-803-A
General Visual Inspection of the Engine Hydraulic Tubes and Hoses

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: OBEY THE HYDRAULIC SAFETY PROCEDURES.

ZONE: 435

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 2M (6 FT) - ADJUSTABLE
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
435	FAN AND ACCESSORY GEARBOX
195BB, 197CB
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL, 438AR

C. Referenced Information

REFERENCE	DESIGNATION
TASK 29-10-00-864-001-A	Depressurize the Green Hydraulic System
TASK 29-11-49-000-809-A	Removal of the Hydraulic Pressure Line from the Pylon to the Green Hydraulic Pump
TASK 29-11-49-000-810-A	Removal of the Hydraulic Case Drain-Line from the Pylon to the Green Hydraulic Pump
TASK 29-11-49-000-811-A	Removal of the Hydraulic Suction Line from the Pylon to the Green Hydraulic Pump
TASK 29-11-49-400-809-A	Installation of the Hydraulic Pressure Line from the Pylon to the Green Hydraulic Pump
TASK 29-11-49-400-810-A	Installation of the Hydraulic Case Drain-Line from the Pylon to the Green Hydraulic Pump
TASK 29-11-49-400-811-A	Installation of the Hydraulic Suction Line from the Pylon to the Green Hydraulic Pump
TASK 29-14-00-614-001-A	Depressurization of the Hydraulic Reservoirs
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
Hydraulic Case Drain Line
Hydraulic Pressure Line
Hydraulic Suction Line

3. Job Set-up
Subtask 29-11-49-860-150-A

A. Aircraft Maintenance Configuration
(1) Make sure that the Green hydraulic system is depressurized
(Ref. AMM TASK 29-10-00-864-001).
(2) Depressurize the reservoir of the Green hydraulic system
(Ref. AMM TASK 29-14-00-614-001).

Subtask 29-11-49-941-120-A

B. Safety Precautions
(1) On AIR COND panel 30VU:

Make sure that the APU BLEED pushbutton switch is released (ON legend off).
Put a WARNING NOTICE(S) in position to tell persons not to operate this pushbutton switch.

(2) Open access door 197CB.
(a) Put a WARNING NOTICE(S) in position to tell persons not to pressurize the Green hydraulic system.
(3) On the HYD section of panel 40VU:

Put a WARNING NOTICE(S) in position to tell persons not to pressurize the Green hydraulic system.

(4) Open access door 195BB:
(a) Put a WARNING NOTICE(S) in position to tell persons not to pressurize the reservoir of the Green hydraulic system.
(5) On the center pedestal, on ENG panel 115VU:

Make sure that the ENG/MODE selector switch is in the NORM position.
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.
Put WARNING NOTICE(S) in position to tell persons not to operate the ENG/MODE selector switch and the ENG/MASTER 1(2) control switch.

(6) On the ENG section of maintenance panel 50VU:

Make sure that the ON legend of the FADEC GND PWR/1(2) pushbutton switch is off.
Put a WARNING NOTICE(S) in position to tell persons not to energize FADEC 1(2).

Subtask 29-11-49-010-146-A

C. Get Access
(1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-803):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL 438AR
(2) Put an ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position at the engine.

4. Procedure
Subtask 29-11-49-210-056-A

A. General Visual Inspection of the Engine Hydraulic Tubes and Hoses
(1) Clean the component interfaces and the adjacent area.
(2) Do a visual inspection of the engine hydraulic tubes and hoses.
(a) Examine the hydraulic suction line, pressure line and case drain line. Look for cracks, corrosion, nicks, scratches, chafing, dents and other damage.
(b) Examine the hydraulic suction line, pressure line and case drain line. Look for loose connections and leaks.
(c) Examine the hydraulic suction line, pressure line and case drain line and attaching hardware. Look for loose, worn, damaged or missing hardware.
(3) If you find damage, make sure that it is in the permitted limits:

DAMAGE TYPE	MAXIMUM PERMITTED LIMIT
Cracks	Not permitted
Dents	10% of the nominal diameter of the tube
Nicks, scratches, chafing, scores	5% of the tube wall thickness

Table - Maximum Permitted Limit for Each Type of Damage of Hydraulic Tubes and Hoses

(4) If you find damage that is not permitted or not included in step (3), replace the part:

For the hydraulic case drain line (Ref. AMM TASK 29-11-49-000-810) and (Ref. AMM TASK 29-11-49-400-810)
For the hydraulic suction line (Ref. AMM TASK 29-11-49-000-811) and (Ref. AMM TASK 29-11-49-400-811)
For the hydraulic pressure line (Ref. AMM TASK 29-11-49-000-809) and (Ref. AMM TASK 29-11-49-400-809).

5. Close-up
Subtask 29-11-49-410-114-A

A. 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
(3) Close access doors 197CB and 195BB.
(4) Remove the WARNING NOTICE(S).
(5) Remove the access platform(s).

[Rev.10 from 2021] 2026.04.01 00:18:04 UTC