Commercial 

Airplanes 767

Service Bulletin

SPECIAL ATTENTION

Number: 767-57-0121

Original Issue: October 07, 2010

Revision 2: January 10, 2012

ATA System: 5700

SUBJECT: WINGS - Leading Edge and Leading Edge Devices - Leading Edge Fluid Drainage

Path Change

Export of this technology is controlled under the United States Export Administration Regulations (EAR) (15

CFR 730-774). An export license may be required before it is used for development, production or use by foreign

persons from specific countries. The controller of this data has the individual responsibility to abide by all export

laws.

ECCN: 9E991

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Copyright © 2010 The Boeing Company

Unpublished Work - All Rights Reserved

Boeing claims copyright in each page of this document only to the extent that the page contains copyrightable

subject matter. Boeing also claims copyright in this document as a compilation and/or collective work.

This document includes proprietary information owned by The Boeing Company and/or one or more third parties.

Treatment of the document and the information it contains is governed by contract with Boeing. For more

information, contact The Boeing Company, P.O. Box 3707, Seattle, Washington 98124.

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2.0
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BOEING SERVICE BULLETIN 767-57-0121

BLANK PAGE
Commercial 

Airplanes 767

Service Bulletin

SPECIAL ATTENTION

Short Form Revision Number: 767-57-0121

Original Issue: October 07, 2010

Revision 2: January 10, 2012

ATA System: 5700

SUBJECT: WINGS - Leading Edge and Leading Edge Devices - Leading Edge Fluid Drainage

Path Change

Revision 2 is sent to change information. Only the changed information is described below. Revision 1 and

Revision 2 are necessary to do the service bulletin.

COMPLIANCE INFORMATION RELATED TO THIS REVISION

No more work is necessary on the airplanes changed in accordance with the original issue or Revision 1 of this

service bulletin.

Federal Aviation Administration (FAA) Notice of Proposed Rule Making NPRM 2010-NM-272-AD, is related to

this service bulletin.

REASON FOR REVISION

This revision is sent to add part marking instructions for the wing panels and ribs modified in figures 1, 2, 5, 6,

7 and 8 and to add replacement parts that are available for purchase.

REVISION HISTORY

Original Issue: October 07, 2010

Revision 1: July 27, 2011

Revision 2: January 10, 2012

EFFECTIVITY

767-200, -300, -300F, -400ER Airplanes. Refer to Paragraph 1.A.1., Airplanes, in Revision 1 of this service

bulletin for the list of affected airplanes.

APPROVAL

This service bulletin was examined by the Federal Aviation Administration (FAA). The changes specified in this

service bulletin comply with the applicable regulations and are FAA approved, as well as European Aviation

Safety Agency (EASA)/Joint Aviation Authorities (JAA) approved for all EASA/JAA approved airplanes listed in

the service bulletin effectivity. This service bulletin and its approval were based on the airplane in its original

Boeing delivery configuration or as modified by other approved Boeing changes.

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Revision 2: January 10, 2012 767-57-0121

3 of 10
If an airplane has a non-Boeing modification or repair that affects a component or system also affected by this

service bulletin, the operator is responsible for obtaining appropriate regulatory agency approval before

incorporating this service bulletin.

EXISTING INFORMATION

The following is the existing information in the service bulletin:

1. In Paragraph 1.K. - Publications Affected, item 1 is shown as follows:

1. Publications:

None.

2. In Paragraph 2.C.2. - Parts and Materials Supplied by the Operator, the table is shown as follows:

Part Number / QTY Name Notes

Specification

BMS5-45 - Sealant (a)

BMS10-79, TYPE - Primer (a)

III

BMS10-60, TYPE - Enamel (a)

II, BAC707 GRAY

GLOSS

BMS5-16 (BMS5- - Hole Filling Compound (a)

45 CLASS B or

BMS5-95 CLASS

B or BMS5-142

CLASS B optional)

BMS5-125 TYPE - Leveling Compound (a)

III

BMS5-142 (BMS5- - Sealant (a)

45 optional)

Refer to SOPM 20- - Chemical Conversion Coating

43-03

Refer to SOPM 20- - Parting Agent

50-19

This part replaces existing

lower leading edge skin pan

521EB.

654T0513-1301 1 Panel Assy

This part replaces existing

lower leading edge skin pan

621EB.

654T0513-1302 1 Panel Assy

(a) Refer to the Qualified Products List at the end of the Boeing Material Specification (BMS)

for supplier data.

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Revision 2: January 10, 2012 767-57-0121

4 of 10

BOEING SERVICE BULLETIN 767-57-0121
3. In Paragraph 2.C.3. - Parts Modified and Reidentified, the table is shown as follows:

Existing Part QTY Name New Part Number Notes

Number

Skin Panel, Outboard, 114T2400-( ) (a) (c) (d) (e)

Lower Leading Edge,

Outboard

114T2400-( ) 1

(521EB) (521EB)

(b)

Skin Panel, Outboard, 114T2400-( ) (a) (c) (d) (e)

Lower Leading Edge,

Outboard

114T2400-( ) 1

(621EB) (621EB)

(b)

(a) Make the change in accordance with this service bulletin.

(b) There is no equivalent Boeing part number for the changed part. Identify on the part that

the change done in accordance with this service bulletin was made.

(c) This is the part number after the change is done in accordance with this service bulletin.

(d) This part is not used in production.

(e) A production panel can be purchased from Boeing as an alternative to modifying the existing

panel.

4. In Paragraph 3.B., Work Instructions:

a. Part 1 is shown as follows:

Part 1 - Lower Wing Skin Change

(1) Change the leading edge lower wing skin panels below in accordance with the applicable figures

below:

Left Wing Right Wing

521AB FIGURE 1 621AB FIGURE 2

521EB FIGURE 3 621EB FIGURE 4

NOTE: The leading edge lower wing skin panels in the table below can be purchased from Boeing

with the changes already incorporated by this service bulletin. See the table below for

applicable part numbers.

Left Wing Right Wing

521EB 654T0513-1301 621EB 654T0513-1302

(2) Change the seal door at OSS 424.097 in accordance with the figures below:

Left Wing Right Wing

FIGURE 5 FIGURE 6

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BOEING SERVICE BULLETIN 767-57-0121
5. In FIGURE 1: LEFT WING SKIN PANEL 521AB CHANGE, the step table is shown with Steps 1 through 6.

6. In FIGURE 2: RIGHT WING SKIN PANEL 621AB CHANGE, the step table is shown with Steps 1 through

6.

7. In FIGURE 5: LEFT WING SEAL DOOR CHANGE AT OSS 424.097, the step table is shown with Steps 1

through 6.

8. In FIGURE 6: RIGHT WING SEAL DOOR CHANGE AT OSS 424.097, the step table is shown with Steps

1 through 6.

9. In FIGURE 7: LEFT WING RIB CHANGE AT OSS 464.475, the step table is shown with Steps 1 through

12.

10. In FIGURE 8: RIGHT WING RIB CHANGE AT OSS 464.475, the step table is shown with Steps 1 through

12.

CHANGED INFORMATION

For each numbered item in the CHANGED INFORMATION, refer to the same numbered item in the EXISTING

INFORMATION. The following is the changed information in the service bulletin:

1. In Paragraph 1.K. - Publications Affected, item 1 is changed as follows:

1. Publications:

Publication Chapter Section

767 Illustrated Parts Catalog 57-41

2. In Paragraph 2.C.2. - Parts and Materials Supplied by the Operator, the table is changed as follows:

Part Number / QTY Name Notes

Specification

BMS5-45 - Sealant (a)

BMS10-79, TYPE - Primer (a)

III

BMS10-60, TYPE - Enamel (a)

II, BAC707 GRAY

GLOSS

BMS5-16 (BMS5- - Hole Filling Compound (a)

45 CLASS B or

BMS5-95 CLASS

B or BMS5-142

CLASS B optional)

BMS5-125 TYPE - Leveling Compound (a)

III

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BOEING SERVICE BULLETIN 767-57-0121
Part Number / QTY Name Notes

Specification

BMS5-142 (BMS5- - Sealant (a)

45 optional)

Refer to SOPM 20- - Chemical Conversion Coating

43-03

Refer to SOPM 20- - Parting Agent

50-19

This part replaces existing

lower leading edge skin

panel 521EB. (b)

654T0513-1301 1 Panel Assy

This part replaces existing

lower leading edge skin

panel 621EB. (b)

654T0513-1302 1 Panel Assy

This part replaces existing

lower leading edge skin

panel 521AB. (b)

114T2400-839 1 Panel Assy

This part replaces existing

lower leading edge skin

panel 621AB. (b)

114T2400-840 1 Panel Assy

This part replaces existing

seal door panel at OSS

424.097. (b)

114T0205-123 1 Door Assy - OSS 424.097

This part replaces existing

sealdoor panel at OSS

424.097. (b)

114T0205-123 1 Door Assy - OSS 424.097

(a) Refer to the Qualified Products List at the end of the Boeing Material Specification (BMS)

for supplier data.

(b) These panels can be purchased from Boeing with the changes already incorporated by

this service bulletin.

3. In Paragraph 2.C.3. - Parts Modified and Reidentified, the table is changed as follows:

Existing Part QTY Name New Part Number Notes

Number

Skin Panel, Outboard, 114T2400-( ) (a) (c) (d) (e)

Lower Leading Edge,

Outboard

114T2400-( ) 1

(521AB) (521AB)

(b)

Skin Panel, Outboard, 114T2400-( ) (a) (c) (d) (e)

Lower Leading Edge,

Outboard

114T2400-( ) 1

(621AB) (621AB)

(b)

Skin Panel, Outboard, 114T2400-( ) (a) (c) (d) (e)

Lower Leading Edge,

Outboard

114T2400-( ) 1

(521EB) (521EB)

(b)

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BOEING SERVICE BULLETIN 767-57-0121
Existing Part QTY Name New Part Number Notes

Number

Skin Panel, Outboard, 114T2400-( ) (a) (c) (d) (e)

Lower Leading Edge,

Outboard

114T2400-( ) 1

(621EB) (621EB)

(b)

Seal Door - Leading 114T0205-( ) (a) (c) (d) (e)

Edge, Outboard Wing

114T0205-( ) 1

(521AMB) (521AMB)

(b)

Seal Door - Leading 114T0205-( ) (a) (c) (d) (e)

Edge, Outboard Wing

114T0205-( ) 1

(621AMB) (621AMB)

(b)

Rib - OSS 464.475 114T2605-( ) (a) (c) (d) (e)

Leading Edge Outboard

Wing

114T2605-( ) 2

(b)

(a) Make the change in accordance with this service bulletin.

(b) There is no equivalent Boeing part number for the changed part. Identify on the part that

the change done in accordance with this service bulletin was made.

(c) This is the part number after the change is done in accordance with this service bulletin.

(d) This part is not used in production.

(e) A production panel can be purchased from Boeing as an alternative to modifying the existing

panel.

4. In Paragraph 3.B., Work Instructions:

a. Part 1 is changed as follows:

Part 1 - Lower Wing Skin Change

(1) Change the leading edge lower wing skin panels below in accordance with the applicable figures

below:

Left Wing Right Wing

521AB FIGURE 1 621AB FIGURE 2

521EB FIGURE 3 621EB FIGURE 4

NOTE: The leading edge lower wing skin panels in the table below can be purchased from Boeing

with the changes already incorporated by this service bulletin. See the table below for

applicable part numbers.

Left Wing Right Wing

521AB 114T2400-839 621AB 114T2400-840

521EB 654T0513-1301 621EB 654T0513-1302

(2) Change the seal door at OSS 424.097 in accordance with the figures below:

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BOEING SERVICE BULLETIN 767-57-0121
Left Wing Right Wing

FIGURE 5 FIGURE 6

NOTE: The seal doors in the table below can be purchased from Boeing with the changes already

incorporated by this service bulletin. See the table below for applicable part numbers.

Left Wing Right Wing

114T0205-123 114T0205-124

5. In FIGURE 1: LEFT WING SKIN PANEL 521AB CHANGE, the step table is changed to add Step 7 as

follows:

STEP TASK NAME IDENTIFICATION QTY MORE DATA

Apply rubber stamp

to identify that this

service bulletin was

done. Refer to

SOPM 20-50-10 as

an accepted procedure. (Not shown)

7 Identify Skin Panel 521AB 1

6. In FIGURE 2: RIGHT WING SKIN PANEL 621AB CHANGE, the step table is changed to add Step 7 as

follows:

STEP TASK NAME IDENTIFICATION QTY MORE DATA

Apply rubber stamp

to identify that this

service bulletin was

done. Refer to

SOPM 20-50-10 as

an accepted procedure. (Not shown)

7 Identify Skin Panel 621AB 1

7. In FIGURE 5: LEFT WING SEAL DOOR CHANGE AT OSS 424.097, the step table is changed to add Step

7 as follows:

STEP TASK NAME IDENTIFICATION QTY MORE DATA

Apply rubber stamp

to identify that this

service bulletin was

done. Refer to

SOPM 20-50-10 as

an accepted procedure. (Not shown)

7 Identify Seal Door 521AMB 1

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BOEING SERVICE BULLETIN 767-57-0121
8. In FIGURE 6: RIGHT WING SEAL DOOR CHANGE AT OSS 424.097, the step table is changed to add

Step 7 as follows:

STEP TASK NAME IDENTIFICATION QTY MORE DATA

Apply rubber stamp

to identify that this

service bulletin was

done. Refer to

SOPM 20-50-10 as

an accepted procedure. (Not shown)

7 Identify Seal Door 621AMB 1

9. In FIGURE 7: LEFT WING RIB CHANGE AT OSS 464.475, the step table is changed to add Step 13 as

follows:

STEP TASK NAME IDENTIFICATION QTY MORE DATA

Apply rubber stamp

to identify that this

service bulletin was

done. Refer to

SOPM 20-50-10 as

an accepted procedure. (Not shown)

13 Identify Rib - -

10. In FIGURE 8: RIGHT WING RIB CHANGE AT OSS 464.475, the step table is changed to add Step 13 as

follows:

STEP TASK NAME IDENTIFICATION QTY MORE DATA

Apply rubber stamp

to identify that this

service bulletin was

done. Refer to

SOPM 20-50-10 as

an accepted procedure. (Not shown)

13 Identify Rib - -

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BOEING SERVICE BULLETIN 767-57-0121