GENERAL VISUAL INSPECTION OF FAN COWL (EWIS)

TASK 05-24-30-200-003-A
GENERAL VISUAL INSPECTION OF FAN COWL (EWIS)

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.

ZONE: 437
ZONE: 438
ZONE: 447
ZONE: 448

1. Reason for the Job
Refer to the MPD TASK: ZL-437-01
GENERAL VISUAL INSPECTION OF FAN COWL (EWIS)

NOTE: This is an EWIS (Electrical Wiring Interconnection System) procedure. EWIS is defined in ESPM 20-33-11.

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

REFERENCE	QTY	DESIGNATION
No specific	AR	ACCESS PLATFORM 2M (6 FT)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
437	FAN COWL
438	FAN COWL
447	FAN COWL
448	FAN COWL
437AL, 438AR, 447AL, 448AR

C. Referenced Information

REFERENCE	DESIGNATION
TASK 71-13-00-010-010-A	Opening of the Fan Cowls 437AL(447AL),438AR(448AR)
TASK 71-13-00-010-040-A	Opening of the Fan Cowl Doors
TASK 71-13-00-010-040-B	Opening of the Fan Cowl Doors
TASK 71-13-00-010-802-A	Opening of the Fan Cowl Doors
TASK 71-13-00-410-010-A	Closing of the Fan Cowls 437AL(447AL),438AR(448AR)
TASK 71-13-00-410-040-A	Closing of the Fan Cowl Doors
TASK 71-13-00-410-040-B	Closing of the Fan Cowl Doors
TASK 71-13-00-410-802-A	Closing of the Fan Cowl Doors
TASK 78-30-00-040-012-A	Deactivation of the Thrust Reverser Hydraulic Control Unit (HCU) for Ground Maintenance
TASK 78-30-00-040-805-A	Deactivation of the Thrust Reverser System for Ground Maintenance
TASK 78-30-00-081-041-A	Make the Thrust Reverser Serviceable after Maintenance
TASK 78-30-00-081-041-B	Make the Thrust Reverser Serviceable after Maintenance
TASK 78-30-00-440-012-A	Re-activation of the Thrust Reverser Hydraulic Control Unit (HCU) after Ground Maintenance
TASK 78-30-00-440-805-A	Reactivation of the Thrust Reverser System after Ground Maintenance
TASK 78-30-00-481-041-A	Make the Thrust Reverser Unserviceable for Maintenance
TASK 78-30-00-481-041-B	Make the Thrust Reverser Unserviceable for Maintenance
Access Doors of the Left Nacelle (Left Side) ** ON A/C NOT FOR ALL
Access Doors of the Left Nacelle (Right Side) ** ON A/C NOT FOR ALL
Access Doors of the Right Nacelle (Right Side) ** ON A/C NOT FOR ALL
Access Doors of the Right Nacelle (Left Side) ** ON A/C NOT FOR ALL
Access Doors of the Left Nacelle (Left Side) ** ON A/C NOT FOR ALL
Access Doors of the Left Nacelle (Right Side) ** ON A/C NOT FOR ALL
Access Doors of the Right Nacelle (Right Side) ** ON A/C NOT FOR ALL
Access Doors of the Right Nacelle (Left Side) ** ON A/C NOT FOR ALL
Access Door of the Left Nacelle (Left Side) ** ON A/C NOT FOR ALL
Access Panel and Door of the Left Nacelle (Right Side) ** ON A/C NOT FOR ALL
Access Panel and Door of the Right Nacelle (Right Side) ** ON A/C NOT FOR ALL
Access Door of the Right Nacelle (Left Side) ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 05-24-30-040-050-B ** ON A/C NOT FOR ALL

A. Deactivation of the Thrust Reverser

WARNING: MAKE SURE THAT YOU DO THE DEACTIVATION OF THE THRUST REVERSER BEFORE YOU DO MAINTENANCE WORK ON OR AROUND THE THRUST REVERSER. IF YOU DO NOT DO THIS PROCEDURE, THERE IS A RISK OF UNWANTED OPERATION AND THUS OF INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.

(1) Make sure that the thrust reverser is unserviceable (Ref. AMM TASK 78-30-00-481-041).

Subtask 05-24-30-010-052-B ** ON A/C NOT FOR ALL

B. Get Access
(1) Put an ACCESS PLATFORM 2M (6 FT) in position at the zones 437 and 447.
(2) Make sure that the fan cowl doors are open:

Access Doors of the Left Nacelle (Left Side) ** ON A/C NOT FOR ALL

Access Doors of the Left Nacelle (Right Side) ** ON A/C NOT FOR ALL

437AL 438AR,

Access Doors of the Right Nacelle (Right Side) ** ON A/C NOT FOR ALL

Access Doors of the Right Nacelle (Left Side) ** ON A/C NOT FOR ALL

447AL 448AR (Ref. AMM TASK 71-13-00-010-040).

Subtask 05-24-30-040-050-C ** ON A/C NOT FOR ALL

C. Deactivation of the Thrust Reverser

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

Subtask 05-24-30-010-052-C ** ON A/C NOT FOR ALL

D. Get Access
(1) Put an ACCESS PLATFORM 2M (6 FT) in position at the zones 437 and 447.
(2) Make sure that the fan cowl doors are open:

Access Doors of the Left Nacelle (Left Side) ** ON A/C NOT FOR ALL

Access Doors of the Left Nacelle (Right Side) ** ON A/C NOT FOR ALL

437AL 438AR,

Access Doors of the Right Nacelle (Right Side) ** ON A/C NOT FOR ALL

Access Doors of the Right Nacelle (Left Side) ** ON A/C NOT FOR ALL

447AL 448AR (Ref. AMM TASK 71-13-00-010-010).

Subtask 05-24-30-040-050-F ** ON A/C NOT FOR ALL

E. Deactivation of the Thrust Reverser

(1) Deactivate the thrust reverser system for maintenance (Ref. AMM TASK 78-30-00-040-805).

Subtask 05-24-30-010-052-F ** ON A/C NOT FOR ALL

F. Get Access
(1) Put an ACCESS PLATFORM 2M (6 FT) in position at zone 437 (447).
(2) Make sure that the fan cowl doors are open (Ref. AMM TASK 71-13-00-010-802):

Access Door of the Left Nacelle (Left Side) ** ON A/C NOT FOR ALL

Access Panel and Door of the Left Nacelle (Right Side) ** ON A/C NOT FOR ALL

Access Panel and Door of the Right Nacelle (Right Side) ** ON A/C NOT FOR ALL

Access Door of the Right Nacelle (Left Side) ** ON A/C NOT FOR ALL

437AL 438AR 447AL and 448AR.

4. Procedure
Subtask 05-24-30-210-052-A

A. Do a general visual inspection of the fan cowl.
Make sure that:

There is no damage (corrosion, leaks or cracks) on all the parts of the components and the structure you can see.
All the installations (wiring) are correctly attached.

5. Close-up
Subtask 05-24-30-440-050-B ** ON A/C NOT FOR ALL

A. Reactivation of the Thrust Reverser
(1) Make sure that the thrust reverser is serviceable (Ref. AMM TASK 78-30-00-081-041).

Subtask 05-24-30-410-052-B ** ON A/C NOT FOR ALL

B. Close Access
(1) Make sure that the fan cowl doors are closed:
437AL 438AR,
447AL 448AR (Ref. AMM TASK 71-13-00-410-040).
(2) Remove the access platform(s).

Subtask 05-24-30-440-050-C ** ON A/C NOT FOR ALL

C. Reactivation of the Thrust Reverser
(1) Activate the thrust reverser Hydraulic Control Unit (HCU) after ground maintenance (Ref. AMM TASK 78-30-00-440-012).

Subtask 05-24-30-410-052-C ** ON A/C NOT FOR ALL

D. Close Access
(1) Make sure that the fan cowl doors are closed:
437AL 438AR,
447AL 448AR (Ref. AMM TASK 71-13-00-410-010).
(2) Remove the access platform(s).

Subtask 05-24-30-440-050-F ** ON A/C NOT FOR ALL

E. Reactivation of the Thrust Reverser
(1) Do the activation of the thrust reverser system after maintenance (Ref. AMM TASK 78-30-00-440-805).

Subtask 05-24-30-410-052-F ** ON A/C NOT FOR ALL

F. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Make sure that the fan cowl doors are closed (Ref. AMM TASK 71-13-00-410-802):

Access Door of the Left Nacelle (Left Side) ** ON A/C NOT FOR ALL

Access Panel and Door of the Left Nacelle (Right Side) ** ON A/C NOT FOR ALL

Access Panel and Door of the Right Nacelle (Right Side) ** ON A/C NOT FOR ALL

Access Door of the Right Nacelle (Left Side) ** ON A/C NOT FOR ALL

437AL 438AR 447AL and 448AR.
(3) Remove the access platform(s).

[Rev.10 from 2021] 2026.03.31 22:49:54 UTC