GENERAL VISUAL INSPECTION OF INBOARD FIXED LEADING EDGE STRUCTURE (EWIS)

TASK 05-25-20-200-001-A
GENERAL VISUAL INSPECTION OF INBOARD FIXED LEADING EDGE STRUCTURE (EWIS)

WARNING: DO NOT EXTEND THE SLATS AND FLAPS WHEN THE THRUST REVERSER COWLS ARE DEPLOYED IN THE 45 DEG. POSITION.

ZONE: 521
ZONE: 621

1. Reason for the Job
Refer to the MPD TASK: ZL-521-01
GENERAL VISUAL INSPECTION OF INBOARD FIXED LEADING EDGE STRUCTURE (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 3M (10 FT)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
521	INBOARD FIXED L.E STRUCTURE
621	INBOARD FIXED L.E STRUCTURE
521AB, 521AT, 521BT, 521CB, 521EB, 521GB, 521HB, 621AB, 621AT, 621BT, 621CB, 621EB, 621GB, 621HB

C. Referenced Information

REFERENCE	DESIGNATION
TASK 27-80-00-866-004-A	Extending the Slats on the Ground
TASK 27-80-00-866-005-A	Retracting the Slats on the Ground
TASK 57-41-37-000-004-A	Removal of the Pressure Relief Panels
TASK 57-41-37-000-009-A	Removal of the Access Panel
TASK 57-41-37-000-010-A	Removal of the Access Panel
TASK 57-41-37-000-011-A	Removal of the Access Panel
TASK 57-41-37-000-802-A	Removal of the Access Panel 521AT(621AT)
TASK 57-41-37-400-002-A	Installation of the Pressure Relief Panels
TASK 57-41-37-400-009-A	Installation of the Access Panel
TASK 57-41-37-400-010-A	Installation of the Access Panel
TASK 57-41-37-400-011-A	Installation of the Access Panel
TASK 57-41-37-400-802-A	Installation of the Access Panel 521AT(621AT)
Access Panels of the Upper Leading Edge of the Wing
Access Panels of the Lower Surface of the Wing

3. Job Set-up
Subtask 05-25-20-866-050-A

A. Aircraft Maintenance Configuration
(1) Extend the slats (Ref. AMM TASK 27-80-00-866-004).

Subtask 05-25-20-010-050-A

B. Get Access
(1) Put an ACCESS PLATFORM 3M (10 FT) in position at the zone 522 (622).
(2) Remove the access panels:

Access Panels of the Upper Leading Edge of the Wing

Access Panels of the Lower Surface of the Wing

521AB 521AT 521BT,
521CB 521EB 521GB,
521HB.
621AB 621AT 621BT,
621CB 621EB 621GB,
621HB.
(Ref. AMM TASK 57-41-37-000-004) (Ref. AMM TASK 57-41-37-000-009) (Ref. AMM TASK 57-41-37-000-010) (Ref. AMM TASK 57-41-37-000-011) (Ref. AMM TASK 57-41-37-000-802)

4. Procedure
Subtask 05-25-20-210-050-A

A. Inspection
(1) Do a general visual inspection of the structure of the inboard fixed leading edge.
(2) Make sure that there are no signs of corrosion, cracks or damage.
(3) Make sure that all the installations (wiring, ducting, piping) are attached correctly.

5. Close-up
Subtask 05-25-20-410-050-A

A. Close Access
(1) Install the access panels:
521AB 521AT 521BT,
521CB 521EB 521GB,
521HB.
621AB 621AT 621BT,
621CB 621EB 621GB,
621HB.
(Ref. AMM TASK 57-41-37-400-002) (Ref. AMM TASK 57-41-37-400-009) (Ref. AMM TASK 57-41-37-400-010) (Ref. AMM TASK 57-41-37-400-011) (Ref. AMM TASK 57-41-37-400-802)
(2) Remove the access platform(s).

Subtask 05-25-20-866-051-A

B. Aircraft Maintenance Configuration
(1) Fully retract the slats (Ref. AMM TASK 27-80-00-866-005).

[Rev.10 from 2021] 2026.03.31 22:50:09 UTC