Removal of the Pylon Hydraulic Tube Tee Connectors [IAE]

TASK 78-31-49-000-010-A
Removal of the Pylon Hydraulic Tube Tee Connectors

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: DO NOT GET THE FLUID ON YOUR SKIN OR IN YOUR EYES. IF YOU DO:

FLUSH IT AWAY WITH CLEAN WATER
GET MEDICAL AID.

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.

FIN: 1000EM1 ** ON A/C NOT FOR ALL
FIN: 1000EM2 ** ON A/C NOT FOR ALL

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	ACCESS PLATFORM 2M (6 FT)
No specific	AR	CAP - BLANKING
No specific	AR	CONTAINER - CLEAN, APPLICABLE
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [1000EM1] (ENGINE-1)
437AL, 438AR, 451AL, 452AR
FOR [1000EM2] (ENGINE-2)
447AL, 448AR, 461AL, 462AR

C. Referenced Information

REFERENCE	DESIGNATION
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 29-14-00-614-001-A	Depressurization of the Hydraulic Reservoirs
TASK 71-13-00-010-010-A	Opening of the Fan Cowls 437AL(447AL),438AR(448AR)
TASK 78-30-00-040-012-A	Deactivation of the Thrust Reverser Hydraulic Control Unit (HCU) for Ground Maintenance
TASK 78-32-00-010-010-A	Opening of the Thrust Reverser Halves
TASK 78-32-44-000-010-A	Removal of the Left C-Duct Flexible Synchronous Cables and Tubes
TASK 78-32-74-000-010-A	Removal of the Right C-Duct Flexible Synchronous Cables and Tubes
Tee Connectors

3. Job Set-up
Subtask 78-31-49-941-101-A ** ON A/C NOT FOR ALL

A. Safety Precautions
(1) On the center pedestal, on the ENG panel 115VU:
(a) Put a WARNING NOTICE(S) to tell persons not to start the engine.
(2) Make sure that the engine 1(2) shutdown occurred not less than 5 minutes before you do this procedure.
(3) On the overhead maintenance panel 50VU:
(a) Make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put a WARNING NOTICE(S) to tell persons not to energize the FADEC 1(2).

Subtask 78-31-49-614-050-A ** ON A/C NOT FOR ALL

B. Depressurize the Hydraulic System.
(1) Put a WARNING NOTICE(S) in position to tell persons not to pressurize the applicable system.
(a) On the HYD/FUEL panel 40VU.
(b) On the ground service panel of the applicable hydraulic system.
(2) Depressurize the applicable hydraulic system (Ref. AMM TASK 29-10-00-864-001) or (Ref. AMM TASK 29-10-00-864-002).
(3) Depressurize the reservoir of the applicable hydraulic system (Ref. AMM TASK 29-14-00-614-001).

Subtask 78-31-49-010-163-A ** ON A/C NOT FOR ALL

C. Open the fan cowls (Ref. AMM TASK 71-13-00-010-010):
(1) FOR [1000EM1] (ENGINE-1)
437AL 438AR.
(2) FOR [1000EM2] (ENGINE-2)
447AL 448AR.
(3) Put the ACCESS PLATFORM 2M (6 FT) in position.

Subtask 78-31-49-040-150-A ** ON A/C NOT FOR ALL

D. Deactivation of the Thrust Reverser:

WARNING: MAKE SURE THAT THE THRUST REVERSER HYDRAULIC CONTROL UNIT (HCU) IS DEACTIVATED BEFORE YOU DO WORK ON OR AROUND THE THRUST REVERSER. IF THE HCU IS NOT DEACTIVATED, THERE IS A RISK OF UNWANTED THRUST REVERSER OPERATION WHICH CAN CAUSE INJURY TO PERSONS AND/OR DAMAGE TO EQUIPMENT.

(1) Deactivate the thrust reverser Hydraulic-Control-Unit (HCU) (Ref. AMM TASK 78-30-00-040-012).

Subtask 78-31-49-010-164-A ** ON A/C NOT FOR ALL

E. Open the thrust reverser halves (Ref. AMM TASK 78-32-00-010-010):
(1) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(2) FOR [1000EM2] (ENGINE-2)
461AL 462AR

Subtask 78-31-49-010-165-A ** ON A/C NOT FOR ALL

F. Remove the upper flexible synchronous cables and tubes
(1) Remove the left C-duct upper flexible synchronous cables and tubes (Ref. AMM TASK 78-32-44-000-010).
(2) Remove the right C-duct upper flexible synchronous cables and tubes (Ref. AMM TASK 78-32-74-000-010).

4. Procedure
Subtask 78-31-49-020-098-A ** ON A/C NOT FOR ALL

A. Removal of the Pylon Hydraulic Tube Tee Connectors:
(1) Disconnect the hydraulic tubes

Tee Connectors ** ON A/C NOT FOR ALL

(a) Put the CONTAINER - CLEAN, APPLICABLE under the hydraulic connections to catch the hydraulic fluid when the connections are opened.
(b) Disconnect the hydraulic pressure tube (9) from the pressure tee connector (10).
(c) Disconnect the hydraulic return tube (7) from the return tee connector (2).
(d) Remove the container and discard the drained hydraulic fluid.
(2) Remove the tee connectors

Tee Connectors ** ON A/C NOT FOR ALL

(a) Remove the three bolts (4), the three washers (3) and the pressure tee connector (10) from the pylon bracket (1).
(b) Remove the three bolts (4), the three washers (3) and the return tee connector (2) from the pylon bracket (1).

Subtask 78-31-49-010-166-A ** ON A/C NOT FOR ALL

B. Remove the union (5) and packing (11) from the pressure tee connector (10).
(1) Discard the packing (11).

Tee Connectors ** ON A/C NOT FOR ALL

Subtask 78-31-49-620-050-A ** ON A/C NOT FOR ALL

C. Put the applicable CAP - BLANKING on all the openings.

[Rev.10 from 2021] 2026.04.01 03:27:36 UTC