Operational Check of the Pylon Drain System for Return to Operation after a Parking or Storage Period

TASK 54-50-00-720-801-A
Operational Check of the Pylon Drain System for Return to Operation after a Parking or Storage Period

WARNING: BEFORE YOU DO WORK ON OR NEAR THE ENGINES, PUT A WARNING NOTICE IN THE COCKPIT. THIS WARNING NOTICE MUST TELL PERSONS NOT TO START THE ENGINES DURING THE PROCEDURE. IF THE ENGINES START WHILE YOU ARE NEAR THEM, THE SUCTION CAN PULL YOU INTO OR AGAINST THE AIR INTAKE. THIS CAN KILL YOU OR CAUSE INJURY TO YOU.

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.

WARNING: PUT THE SAFETY DEVICES AND THE WARNING NOTICES IN POSITION BEFORE YOU START A TASK ON OR NEAR:

THE FLIGHT CONTROLS
THE FLIGHT CONTROL SURFACES
THE LANDING GEAR AND THE RELATED DOORS
COMPONENTS THAT MOVE.

MOVEMENT OF COMPONENTS CAN KILL OR CAUSE INJURY TO PERSONS AND/OR CAN CAUSE DAMAGE TO THE EQUIPMENT.

WARNING: BEFORE YOU START WORK, YOU MUST PUT ON A SAFETY HARNESS AND ATTACH IT TO THE ACCESS PLATFORM. WITHOUT A SAFETY HARNESS, YOU CAN FALL. THIS CAN KILL YOU OR CAUSE YOU INJURY.

ZONE: 410
ZONE: 420
ZONE: 470
ZONE: 480

1. Reason for the Job

NOTE: This task is only applicable to the aircraft return to operation. This task must not replace the Maintenance Planning Document (MPD) task "545900-L1".

2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 3M (10 FT)
No specific	1	FLASHLIGHT
No specific	1	MIRROR - INSPECTION
No specific	AR	SAFETY BARRIER(S)
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	1	SYRINGE
No specific	1	WARNING NOTICE(S)
98D27803500001	1	LOCKING TOOL ZERO POS
98L12003001000	AR	HARNESS,SAFETY

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
410	ENG 1 PYLON BOX AND FORWARD FAIRING
420	ENG 2 PYLON BOX AND FORWARD FAIRING
470	ENGINE 1 AFT PYLON
480	ENGINE 2 AFT PYLON
413BL, 413ET, 415BL, 423BL, 423ET, 425BL, 471BL, 482BR

C. Referenced Information

REFERENCE	DESIGNATION
TASK 24-41-00-861-002-A	Energize the Aircraft Electrical Circuits from the External Power
TASK 24-41-00-861-002-A-01	Energize the Aircraft Electrical Circuits from the APU
TASK 24-41-00-861-002-A-02	Energize the Aircraft Electrical Circuits from Engine 1(2)
TASK 24-41-00-862-002-A	De-energize the Aircraft Electrical Circuits Supplied from the External Power
TASK 24-41-00-862-002-A-01	De-energize the Aircraft Electrical Circuits Supplied from the APU
TASK 24-41-00-862-002-A-02	De-energize the Aircraft Electrical Circuits Supplied from the Engine 1(2)
TASK 27-50-00-866-009-A	Retraction of the Flaps on the Ground
TASK 27-50-00-866-009-A-01	Retraction of the Flaps/Slats on the Ground
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 54-54-00-000-804-A	Removal of the Rear Pylon Fairing (RPF)
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)
Operational Check of the Pylon Drain System

3. Job Set-up
Subtask 54-50-00-861-050-A

A. Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).

Subtask 54-50-00-941-079-A

B. Safety Precautions
(1) Make sure that the engine shutdown occurred five minutes or more before you do this procedure.
(2) On the center pedestal, on ENG panel 115VU:
(a) Make sure that the ENG/MODE selector switch is in the NORM position.
(b) Before you start the procedure, make sure that the ENG/MASTER 1(2) control switch is in the OFF position for a minimum of five minutes.
(c) Put the WARNING NOTICE(S) in position to tell persons not to operate the ENG/MODE selector switch and the ENG/MASTER 1(2) control switch.
(3) On the ENG section of maintenance panel 50VU:
(a) Make sure that the FADEC GND PWR/1(2) pushbutton switch is released (the ON legend is off).
(b) Put the WARNING NOTICE(S) in position to tell persons not to energize FADEC 1(2).
(4) Make sure that the applicable hydraulic system are depressurized (Ref. AMM TASK 29-10-00-864-001), (Ref. AMM TASK 29-10-00-864-002) and (Ref. AMM TASK 29-10-00-864-003).
(5) Put the WARNING NOTICE(S) in position to tell persons not to pressurize the green, yellow or blue hydraulic system.
(6) Make sure that the flaps and slats are fully retracted (Ref. AMM TASK 27-50-00-866-009).
(7) In the cockpit, on the center pedestal, on FLAPS control panel 114VU:
(a) Install the 98D27803500001 LOCKING TOOL ZERO POS on the flap and slat control lever.
(b) Put the WARNING NOTICE(S) in position on the flap and slat control lever to tell persons not to operate the flaps and slats.
(8) As necessary, use the applicable SAFETY BARRIERS, specified by the operator's instructions and your local regulations.

Subtask 54-50-00-865-065-A

C. Open, safety and tag this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
49VU	ENGINE/2/FADEC A/AND EIU 2	2KS2	A05
49VU	ENGINE/1/FADEC A/AND EIU 1	2KS1	A04
121VU	ENGINE/ENG2/FADEC B/AND EIU2	4KS2	R41
121VU	ENGINE/ENG1/FADEC B/AND EIU 1	4KS1	R40

Subtask 54-50-00-040-073-A

D. Deactivation of the Thrust Reverser

WARNING: MAKE SURE THAT THE THRUST REVERSER IS LOCKED. IF NOT, THE THRUST REVERSER CAN OPERATE ACCIDENTALLY AND CAUSE INJURY TO PERSONNEL AND/OR DAMAGE TO THE REVERSER.

(1) Make the thrust reverser unserviceable for maintenance (Ref. AMM TASK 78-30-00-040-807).

Subtask 54-50-00-010-071-A

E. Get Access

WARNING: BEFORE YOU START WORK, YOU MUST PUT ON A SAFETY HARNESS AND ATTACH IT TO THE ACCESS PLATFORM. WITHOUT A SAFETY HARNESS, YOU CAN FALL. THIS CAN KILL YOU OR CAUSE YOU INJURY.

(1) Put on and attach the HARNESS, SAFETY before you start work in the work area.
(2) Put the ACCESS PLATFORM 3M (10 FT) in position:
(a) For the left pylon, at zones 410 and 470.
(b) For the right pylon, at zones 420 and 480.

4. Procedure
Subtask 54-50-00-720-050-A

A. Operational Check of the Pylon Drain System

Operational Check of the Pylon Drain System

(1) Do a visual check of the drain outlets with the FLASHLIGHT or the MIRROR - INSPECTION to make sure that are no blocked.
(2) Do an operational check of the pylon drain system as follows:
(a) For zone A:
1 Remove the applicable screws from panels 413BL and 423BL.

NOTE: The diameter of the screws hole is 4.8 mm (0.1890 in.).

2 Slowly put water into the screw hole, in the inner forward part of zone A, with a SYRINGE.
3 Make sure that, after one minute, the water flows freely through the drain exit at the engine drain mast.
4 Install the removed screws on panels 413BL and 423BL.
(b) For forward zone F:
1 Remove the applicable screws from panels 413ET and 423ET.

NOTE: The diameter of the screws hole is 4.8 mm (0.1890 in.).

2 Slowly put water into the fastener hole, in the forward part of zone F, with a SYRINGE.
3 Make sure that, after one minute, water freely flows out of the drain line of zones F and D.
If the water does not flow out of the common drain outlet of zones F and D, remove the rear pylon fairing to do a check of the drain outlet of intermediate zone F (Ref. AMM TASK 54-54-00-000-804).
4 Install the removed screws on panels 413ET and 423ET.
(c) For rear zone F:

CAUTION: BE CAREFUL WHEN YOU OPEN A PRESSURE RELIEF DOOR. IF YOU DO NOT, YOU CAN CAUSE DAMAGE TO THE LATCH AND THE PANEL.

1 Open pressure relief doors 471BL and 482BR.
2 Slowly put water into the top of the upper titanium spar with a SYRINGE.
3 Make sure that, after one minute, water freely flows out of the drain line of zone D and F.
(d) For zone D:
Refer to the check for zone F as zones F and D have the same drain outlet.
(e) For zone C:
1 Slowly put water into the ventilation hole, which is in the lock of access doors 415BL and 425BL. To do this, use a SYRINGE.

NOTE: The diameter of the ventilation hole is 14 mm (0.5512 in.).

2 Make sure that, after one minute, water freely flows out of the drain outlet of zone C.

WARNING: USE A PROTECTIVE EYE SHIELD OR GOGGLES WHEN YOU USE COMPRESSED AIR. IF YOU GET HIGH-PRESSURE AIR OR PARTICLES IN YOUR EYES, IN YOUR MOUTH OR ON YOUR SKIN, INJURY CAN OCCUR.

(3) Use the compressed air to dry the pylon drain systems.

5. Close-up
Subtask 54-50-00-440-070-A

A. Reactivation of the Thrust Reverser
(1) Make the thrust reverser serviceable after maintenance (Ref. AMM TASK 78-30-00-440-807).

Subtask 54-50-00-410-073-A

B. Close Access
(1) Remove the WARNING NOTICE(S).
(2) Remove the access platform(s).
(3) Remove the ground support and maintenance equipment, the special and standard tools and all other items.
(4) Make sure that the work area is clean and clear of tools and other items.

Subtask 54-50-00-865-066-A

C. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
49VU	ENGINE/2/FADEC A/AND EIU 2	2KS2	A05
49VU	ENGINE/1/FADEC A/AND EIU 1	2KS1	A04
121VU	ENGINE/ENG2/FADEC B/AND EIU2	4KS2	R41
121VU	ENGINE/ENG1/FADEC B/AND EIU 1	4KS1	R40

Subtask 54-50-00-862-051-A

D. De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).

[Rev.10 from 2021] 2026.04.01 01:59:00 UTC