Removal of the Pylon Tubes and Hoses [CFML]

TASK 78-31-49-000-815-A
Removal of the Pylon 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.

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	CAP - PROTECTION
No specific	1	CONTAINER - HYDRAULIC FLUID RESISTANT
No specific	AR	COVER - PROTECTION
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

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

C. Referenced Information

REFERENCE	DESIGNATION
TASK 71-13-00-010-803-A	Opening of the Fan Cowl Doors
TASK 73-11-46-000-802-A	Removal of the Main Fuel Line from the Pylon to the Fuel Pump
TASK 73-11-49-000-804-A	Removal of the Fuel Return Hose from the Fuel Return Valve (FRV) to the Pylon
TASK 78-30-00-040-807-A	Deactivation of the Thrust Reverser System for Nacelle Maintenance (ICU)
TASK 78-31-44-000-802-A	Removal of the Sync Tubes, Sync Shafts, Flex Tubes and Flex Shaft
TASK 78-31-49-400-815-A	Installation of the Pylon Tubes and Hoses
TASK 78-31-49-680-801-A	Draining of the Thrust Reverser Hydraulic Tubes
Pylon Tubes and Hoses
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
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 29-14-00-614-001-A	Depressurization of the Hydraulic Reservoirs
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
TASK 29-10-00-864-002-A	Depressurize the Yellow Hydraulic System
TASK 29-13-49-000-808-A	Removal of the Hydraulic Pressure Line from the Pylon to the Yellow Hydraulic Pump
TASK 29-13-49-000-809-A	Removal of the Hydraulic Case Drain Line from the Pylon to the Yellow Hydraulic Pump
TASK 29-13-49-000-810-A	Removal of the Hydraulic Suction Line from the Pylon to the Yellow Hydraulic Pump
TASK 29-14-00-614-001-A	Depressurization of the Hydraulic Reservoirs

3. Job Set-up
Subtask 78-31-49-941-133-A

A. Safety Precautions
(1) On the center pedestal, on ENG panel 115VU:
(a) Make sure that the ENG/MODE selector switch is in the NORM position.
(b) 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.
(c) Put WARNING NOTICE(S) in position to tell persons not to operate:

The ENG/MODE selector switch
The ENG/MASTER 1(2) control switch.

(2) On the ENG section of maintenance panel 50VU:
(a) Make sure that the ON legend of the FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put a WARNING NOTICE(S) in position to tell persons not to energize FADEC 1(2).

Subtask 78-31-49-010-235-A

B. 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
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL 448AR
(2) Put an ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position.

Subtask 78-31-49-040-181-A

C. 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) Do the deactivation of the thrust reverser system for nacelle maintenance (Ref. AMM TASK 78-30-00-040-807).

Subtask 78-31-49-864-056-A

D. Depressurize the aircraft hydraulic systems
(Ref. AMM TASK 78-31-49-400-815):
(1) Put a WARNING NOTICE(S) in position to tell persons not to pressurize the applicable system.
(a) On the HYD/FUEL panel 40VU of the overhead panel
(b) On the ground service panel of the applicable hydraulic system.
(2) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
(a) Depressurize the Green hydraulic system
(Ref. AMM TASK 29-10-00-864-001).
(b) Depressurize the reservoir of the Green hydraulic system
(Ref. AMM TASK 29-14-00-614-001).
(3) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
(a) Depressurize the Yellow hydraulic system
(Ref. AMM TASK 29-10-00-864-002).
(b) Depressurize the reservoir of the Yellow hydraulic system.
(Ref. AMM TASK 29-14-00-614-001).

Subtask 78-31-49-680-073-A

E. Draining of the Thrust Reverser Hydraulic Tubes
(1) Drain the thrust reverser hydraulic tubes attached to the actuator (Ref. AMM TASK 78-31-49-680-801).

Subtask 78-31-49-010-244-A

F. Get Access
(1) Put a CONTAINER - HYDRAULIC FLUID RESISTANT in position under the hydraulic connections.
(2) Disconnect the following fuel connections from the pylon:
(a) Fuel supply line (Ref. AMM TASK 73-11-46-000-802).
(b) Fuel return line (Ref. AMM TASK 73-11-49-000-804).
(3) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
(a) Disconnect the following hydraulic connections from the pylon:
1 Hydraulic pressure line (Ref. AMM TASK 29-11-49-000-809).
2 Hydraulic suction line (Ref. AMM TASK 29-11-49-000-811).
3 Hydraulic case drain line (Ref. AMM TASK 29-11-49-000-810).
(4) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
(a) Disconnect the following hydraulic connections from the pylon:
1 Hydraulic pressure line (Ref. AMM TASK 29-13-49-000-808).
2 Hydraulic suction line (Ref. AMM TASK 29-13-49-000-810).
3 Hydraulic case drain line (Ref. AMM TASK 29-13-49-000-809).

4. Procedure
Subtask 78-31-49-020-193-A

A. Removal of the Pylon Tubes and Hoses

Pylon Tubes and Hoses

WARNING: DO NOT GET HYDRAULIC FLUID ON YOUR SKIN, IN YOUR EYES OR IN YOUR MOUTH. HYDRAULIC FLUID IS POISONOUS AND CAN GO THROUGH YOUR SKIN AND INTO YOUR BODY. FLUSH HYDRAULIC FLUID FROM YOUR EYES, MOUTH OR SKIN WITH WATER. GET MEDICAL AID IF YOU GET HYDRAULIC FLUID IN YOUR EYES OR MOUTH.

WARNING: WEAR APPLICABLE PERSONAL PROTECTIVE EQUIPMENT (PPE) WHEN YOU DO THIS TASK. BEFORE YOU USE PPE, READ, UNDERSTAND AND OBEY ALL INSTRUCTIONS FOR ITS USE. THESE INSTRUCTIONS INCLUDE INSTRUCTIONS FROM THE MANUFACTURER, YOUR EMPLOYER AND GOVERNMENT REGULATIONS. YOU CAN GET INJURED IF YOU DO NOT USE PPE. GET INSTRUCTIONS FROM YOUR EMPLOYER ON WHICH PPE IS NECESSARY.

CAUTION: DO NOT LET HYDRAULIC FLUID FALL ON THE ENGINE. UNWANTED HYDRAULIC FLUID MUST BE REMOVED IMMEDIATELY WITH A CLEAN LINT FREE CLOTH. THE FLUID CAN CAUSE DAMAGE TO THE SURFACE PROTECTION AND TO SOME PARTS.

(1) Put a CONTAINER - HYDRAULIC FLUID RESISTANT in position under the hydraulic connections.
(2) Remove the pylon hose (4) as follows:
(a) Make a record of the location and position of the P-clamp (16) on the pylon hose (4) to help during installation.
(b) Remove the bolt (9) and washer (99) that attaches the P-clamp (16) to the support bracket (6).
(c) Disconnect the coupling nut (3) of the pylon hose (4) from the Isolation Control Unit (ICU) (2).
(d) Disconnect the coupling nut (15) of the pylon hose (4) from the pylon tube (13).
(e) Remove the pylon hose (4) from the engine.
(f) Remove the P-clamp (16) from the pylon hose (4).
(3) Remove the pylon hose (5) as follows:
(a) Make a record of the location and position of the P-clamp (7) on the pylon hose (5) to help during installation.
(b) Remove the bolt (8) that attaches the P-clamp (7) to the support bracket (6).
(c) Remove bracket (6) from the pylon structure.
(d) Disconnect the coupling nut (1) of the pylon hose (5) from the ICU (2).
(e) Disconnect the coupling nut (10) of the pylon hose (5) from the pylon tube (12).
(f) Remove the pylon hose (5) from the engine.
(g) Remove the P-clamp (7) from the pylon hose (5).
(4) Remove the flex hose (41) (Ref. AMM TASK 78-31-44-000-802).
(5) Remove the pylon hose (73) as follows:
(a) Disconnect the coupling nut (98) of the pylon hose (73) from the hydraulic tube (95).
(b) Disconnect the coupling nut (74) of the pylon hose (73) from the hydraulic connection (77) at the support bracket (49) on the pylon.
(c) Remove the pylon hose (73) from the engine.
(6) Remove the pylon hose (63) as follows:
(a) Disconnect the coupling nut (91) of the pylon hose (63) from the hydraulic tube (92).
(b) Disconnect the coupling nut (64) of the pylon hose (63) from the hydraulic connection (60) at the support bracket (48) on the pylon.
(c) Remove the pylon hose (63) from the engine.
(7) Remove the pylon hose (82) as follows:
(a) Disconnect the coupling nut (94) of the pylon hose (82) from the hydraulic tube (93).
(b) Disconnect the coupling nut (83) of the pylon hose (82) from the hydraulic connection (79) at the support bracket (48) on the pylon.
(c) Remove the pylon hose (82) from the engine.
(8) Remove the harness bracket (104) as follows:
(a) Remove the two bolts (103) that attach the harness block (105) to the bracket (104).
(b) Remove the two bolts and two washers that attach the harness bracket (104) to the pylon.
(c) Remove the harness bracket (104) from the pylon.
(9) Remove the pylon tubes (13) and (59) as follows:
(a) Make a record of the location and position of the P-clamps (24), (31) and (35) on the pylon tube (13) to help during installation.
(b) Remove the two nuts (80) and (84) and three washers (85), (86) and (81) that attach the pylon tube (13) to the support bracket (48). Discard washer (85).
(c) Remove the two nuts (72) and (76) and three washers (70), (71) and (75) that attach the pylon tube (13) to the support bracket (49). Discard washer (70).
(d) Remove the two nuts (65) and (61) and three washers (66), (67) and (62) that attach the pylon tube (59) to the support bracket (48). Discard washer (66).
(e) Remove the two nuts (52) and (56) and three washers (51), (50) and (55) that attach the pylon tube (59) to the support bracket (49). Discard washer (50).
(f) Remove the bolts and washers that attach the support bracket (48) to the pylon.
(g) Remove the bolts and washers that attach the support bracket (49) to the pylon.
(h) Remove the bolts (23), (27) and (36) that attach the P-clamps (24), (31) and (35) to the support brackets (25), (30), and (37).
(i) Disconnect the coupling nut (57) of the pylon tube (59) from the pylon interface.
(j) Remove the pylon tube (59) from the engine.
(k) Remove the pylon tube (13) from the engine.
(l) Remove the P-clamps (24), (31) and (35) from the pylon tube (13).
(10) Remove the pylon tube (12) as follows:
(a) Make a record of the location and position of the P-clamps (21) and (26) on the pylon tube (12) to help during installation.
(b) Disconnect the coupling nut (29) of the pylon tube (12) from the pylon interface.
(c) Remove the bolts (22) and (28) that attach the P-clamps (21) and (26) to the support brackets (20) and (30).
(d) Remove the pylon tube (12) from the engine.
(e) Remove the P-clamps (21) and (26) from the pylon tube (12).
(11) Install COVER - PROTECTION and CAP - PROTECTION on all open ports, open tubes, open hoses and connectors.

[Rev.10 from 2021] 2026.04.01 03:35:26 UTC