Installation of the Convoluted Bleed Hose with Restrictor

TASK 29-14-13-400-803-A
Installation of the Convoluted Bleed Hose with Restrictor

WARNING: OBEY THE HYDRAULIC SAFETY PROCEDURES.

WARNING: MAKE SURE THAT THE PNEUMATIC SYSTEM IS DEPRESSURIZED BEFORE YOU START WORK. PRESSURIZED AIR CAN CAUSE INJURY TO PERSONNEL.

WARNING: DO NOT TOUCH THE HYDRAULIC SYSTEM COMPONENTS FOR A SHORT TIME AFTER THE ENGINE IS SHUTDOWN. THE ENGINE COMPONENTS STAY HOT FOR SOME TIME AND CAN CAUSE INJURY.

ZONE: 453
FIN: 1390GM

1. Reason for the Job
This procedure is applicable only for the left pylon.
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)
No specific	1	WRENCH - STANDARD
No specific	Torque wrench: range to between 1.7 and 1.5 m.daN (12.54 and 11.06 lbf.ft )
No specific	Torque wrench: range to between 3.2 and 2.9 m.daN (23.60 and 21.39 lbf.ft )

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
453	HOT SECTION
195BB, 197CB, 197EB, 198CB
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL, 438AR, 451AL, 452AR

C. Referenced Information

REFERENCE	DESIGNATION
TASK 20-23-22-910-001-A	Marking of the Unions after Application of Standard or Specific Tightening Torque
TASK 29-10-00-864-001-A	Depressurize the Green Hydraulic System
TASK 29-10-00-864-002-A	Depressurize the Yellow Hydraulic System
TASK 29-10-00-864-003-A	Depressurize the Blue Hydraulic System
TASK 29-14-00-614-001-A	Depressurization of the Hydraulic Reservoirs
TASK 29-14-00-720-002-A	Functional Test of the Hydraulic Reservoir Pressurization System with the Left Engine
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
TASK 78-30-00-040-807-A	Deactivation of the Thrust Reverser System for Nacelle Maintenance (ICU)
TASK 78-30-00-440-807-A	Reactivation of the Thrust Reverser System after Nacelle Maintenance (ICU)
TASK 78-36-00-010-806-A	Opening of the Thrust Reverser Cowl Doors
TASK 78-36-00-410-806-A	Closing of the Thrust Reverser Cowl Doors
Convoluted Bleed Hose with Restrictor

3. Job Set-up
Subtask 29-14-13-860-055-A

A. Aircraft Maintenance Configuration
(1) Make sure that the aircraft hydraulic systems are depressurized (Ref. AMM TASK 29-10-00-864-001) (Ref. AMM TASK 29-10-00-864-002) (Ref. AMM TASK 29-10-00-864-003).
(2) Make sure that the hydraulic reservoirs are depressurized (Ref. AMM TASK 29-14-00-614-001).
(3) Make sure that a WARNING NOTICE(S) is in position to tell persons not to pressurize the Green, Blue and Yellow hydraulic systems:

On access door 197CB, on the ground service panel of the Green hydraulic system.
On access door 197EB, on the ground service panel of the Blue hydraulic system.
On access door 198CB, on the ground service panel of the Yellow hydraulic system.

(4) Make sure that a WARNING NOTICE(S) is in position on the access door 195BB to tell persons not to pressurize the hydraulic reservoirs.

Subtask 29-14-13-941-056-A

B. Safety Precautions
(1) Make sure that the engine 1(2) shutdown occurred not less than five minutes before you do this procedure.
(2) On AIR COND panel 30VU:

Make sure that the APU BLEED pushbutton switch is released (ON legend off).
Make sure that the ENG 1(2) BLEED pushbutton switch is released (OFF legend on).
Make sure that a WARNING NOTICE(S) is in position to tell persons not to operate the pneumatic system.

(3) On the HYD section of panel 40VU:

Make sure that the WARNING NOTICE(S) is in position to tell persons not to pressurize the Green, Blue and Yellow hydraulic systems.

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

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

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

(6) On the HP ground connectors:

Make sure that a WARNING NOTICE(S) is in position to tell persons not to pressurize the pneumatic system.

Subtask 29-14-13-010-057-A

C. Get Access
(1) Make sure that the fan cowl doors are open (Ref. AMM TASK 71-13-00-010-803):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL 438AR

Subtask 29-14-13-040-053-A

D. Deactivation of the Thrust Reverser System 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) Make sure that you did the deactivation of the thrust reverser system for maintenance (Ref. AMM TASK 78-30-00-040-807).

Subtask 29-14-13-010-058-A

E. Get Access
(1) Make sure that the thrust-reverser cowl-doors are open (Ref. AMM TASK 78-36-00-010-806):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
451AL, 452AR
(2) Make sure that an ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE is in position at the pylon.

4. Procedure
Subtask 29-14-13-420-053-A

A. Installation of the Convoluted Bleed Hose with Restrictor

CAUTION: USE TWO WRENCHES TO REMOVE OR INSTALL THE TUBE COUPLING NUTS:

ONE WRENCH TO HOLD THE UNION, AND
ONE TO LOOSEN OR TIGHTEN THE COUPLING NUT.

THIS PREVENTS DAMAGE TO THE PARTS.

(1) Clean the component interfaces and the adjacent area.
(2) Do an inspection of the component interfaces and the adjacent area.
(3) Make sure that the hydraulic line end-fittings are serviceable.
(4) Remove the PLUG - BLANKING from the convoluted bleed hose (2) and from the unions of the pipe (1) and the duct (3).
(5) Connect the convoluted bleed hose (2) to the duct (3).
(6) Tighten the coupling nut of the convoluted bleed hose (2) to the duct (3) with your hand.
(7) Hold the union of the duct (3) with a WRENCH - STANDARD and TORQUE the coupling nut of the convoluted bleed hose (2) to between 3.2 and 2.9 m.daN (23.60 and 21.39 lbf.ft )

.
(8) Connect the convoluted bleed hose (2) to the pipe (1).
(9) Tighten the coupling nut of the convoluted bleed hose (2) to the pipe (1) with your hand.
(10) Hold the union of the pipe (1) with a WRENCH - STANDARD and TORQUE the coupling nut of the convoluted bleed hose (2) to between 1.7 and 1.5 m.daN (12.54 and 11.06 lbf.ft )

.
(11) Install the nut (4), washer (5) and bolt (6).
(12) Tighten the nut (4).
(13) Identify the tightened union nuts with a red line
(Ref. AMM TASK 20-23-22-910-001).

Subtask 29-14-13-720-050-A

B. Test
(1) Do the functional test of the hydraulic reservoir pressurization system with the left engine (Ref. AMM TASK 29-14-00-720-002).
(2) Make sure that there are no leaks at the convoluted bleed hose (2).

5. Close-up
Subtask 29-14-13-410-053-A

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 78-36-00-410-806):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
451AL, 452AR

Subtask 29-14-13-440-051-A

B. Do the reactivation of the thrust reverser system after maintenance (Ref. AMM TASK 78-30-00-440-807).

Subtask 29-14-13-410-054-A

C. Close Access
(1) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-803):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL 438AR
(2) Close access doors 197CB, 197EB, 198CB and 195BB.
(3) Remove the WARNING NOTICE(S).
(4) Remove the access platform(s).

[Rev.10 from 2021] 2026.04.01 00:24:19 UTC