Commercial 

Airplanes 767

Service Bulletin

Number: 767-27-0204

Original Issue: January 27, 2005

Revision 2: August 16, 2011

ATA System: 2731

SUBJECT: FLIGHT CONTROLS - Elevator Control System - Seal Block Drain Hole Inspection

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 © 2005 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Unpublished Work - All Rights Reserved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.

Boeing, the Boeing signature, the Boeing symbol, 707, 717, 727, 737, 747, 757, 767, 777, 787, Dreamliner,

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3.0
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BOEING SERVICE BULLETIN 767-27-0204

BLANK PAGE
Table of Contents

Revision Transmittal Sheet ............................................ 5

Summary ...................................................... 7

1. PLANNING INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

A. Effectivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

1. Airplanes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

2. Spares Affected . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

B. Concurrent Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

C. Reason . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

D. Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

E. Compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

F. Approval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

G. Manpower . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

H. Weight and Balance Changes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

I. Electrical Load Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

J. References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

1. Existing Data: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

2. Data supplied with this Service Bulletin: . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

3. Installation Drawings Used in the Preparation of this Service Bulletin: . . . . . . . . . . . 20

K. Publications Affected . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

L. Interchangeability and Intermixability of Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

2. MATERIAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

A. Material - Price and Availability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

B. Industry Support Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

C. Parts Necessary For Each Airplane . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

1. Kits/Parts: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

2. Parts and Materials Supplied by the Operator: . . . . . . . . . . . . . . . . . . . . . . . . 21

3. Parts Modified and Reidentified: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

4. Parts Removed and Not Replaced: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

D. Parts Necessary to Change Spares . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

E. Special Tooling - Price and Availability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

F. Special Tooling Necessary to do this Service Bulletin . . . . . . . . . . . . . . . . . . . . . . . 21

3. ACCOMPLISHMENT INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

A. GENERAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

B. WORK INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

FIGURE 1: GENERAL VISUAL INSPECTION AND CLEANING OF THE FLANGED TUBES AND DRAIN

HOLES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

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BOEING SERVICE BULLETIN 767-27-0204

BLANK PAGE
Commercial 

Airplanes 767

Service Bulletin

Revision Transmittal Sheet Number: 767-27-0204

Original Issue: January 27, 2005

Revision 2: August 16, 2011

ATA System: 2731

SUBJECT: FLIGHT CONTROLS - Elevator Control System - Seal Block Drain Hole Inspection

This revision includes all pages of the service bulletin.

COMPLIANCE INFORMATION RELATED TO THIS REVISION

Federal Aviation Administration (FAA) Notice of Proposed Rule Making NPRM 2005-NM-058-AD, is related to

this service bulletin.

No more work is necessary on the airplane(s) inspected in accordance with the original issue or revision 1 of

this service bulletin. Continue to accomplish the repeat inspection at the intervals given in Paragraph 1.E.,

Compliance.

REASON FOR REVISION

Revision 2 is sent to limit the effectivity of this service bulletin. Airplanes after line number 974 have a configuration

that is not affected if debris blocks the drain hole in the flanged tube.

These sections were changed:

1. Summary, Compliance: NPRM data is added.

2. Summary, Action: Changed to specify a general visual inspection.

3. Paragraph 1.A., Effectivity: Group 2 added. A paragraph about the Production Revision Record (PRR) is

added.

4. Paragraph 1.B., Concurrent Requirements: changed to give revision levels of the concurrent service bulletin.

5. Paragraph 1.D., Description: Changed to specify a general visual inspection.

6. Paragraph 1.E., Compliance: Changed to give compliance time by airplane group and condition. NPRM

data is added.

7. Paragraph 1.J., References: NPRM reference is added.

8. Paragraph 1.K., Publications Affected: The Damage Tolerance Inspection evaluation statement is added.

9. Paragraph 3.A., General Information: New notes are added.

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10. Paragraph 3.B., Work Instructions: Step 2 is updated to specify a general visual inspection.

11. Paragraph 3.B., Work Instructions: Step 4 is deleted because it is redundant to paragraph 1.E., Compliance.

12. Figure 1: The title is updated to indicate a general visual inspection. Instructions in the Notes column of the

step table are updated to specify a general visual inspection.

Vertical lines are put on the left edge of each page, except in Paragraph 1.A., Effectivity, to show the location

of important changes.

Pages with no vertical lines have no important changes.

REVISION HISTORY

Original Issue: January 27, 2005

Revision 1: February 12, 2009

Revision 2: August 16, 2011

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BOEING SERVICE BULLETIN 767-27-0204
Commercial 

Airplanes 767

Service Bulletin

Summary Number: 767-27-0204

Original Issue: January 27, 2005

Revision 2: August 16, 2011

ATA System: 2731

SUBJECT: FLIGHT CONTROLS - Elevator Control System - Seal Block Drain Hole Inspection

CONCURRENT REQUIREMENTS

Refer to Paragraph 1.B., Concurrent Requirements.

BACKGROUND

The related 767-400ER Boeing service bulletin is 767-27-0205.

The inspection given in this service bulletin will make sure that frozen moisture cannot collect in the aft pressure

seals for the elevator control cables.

The aft pressure seals for the elevator control cables help to keep the cabin pressurized. Two flanged tubes

hold the pressure seals to the rear bulkhead. A small drain hole in each of the two flanged tubes keeps moisture

away from the seals when the cabin is pressurized. If the drain hole is blocked, moisture can collect in the tubes.

If this occurs, the moisture can freeze when the external temperature decreases during high-altitude flight. This

frozen moisture can cause high resistance to the movement of the control cables through the aft pressure seals.

This service bulletin gives instructions for a repetitive inspection of the two flanged tubes and drain holes.

Boeing Service Related Problem (SRP) 767-SRP-27-0185 is related to this service bulletin. Refer to Boeing

Service Letter 767-SL-27-129 for customer reports about this problem.

ACTION (PRR B12901-43S)

Remove the pressure seals from the flanged tubes for elevator control cables E1A and E1B. Do a general visual

inspection of the flanged tubes and drain holes to make sure they are clean. If necessary, clean the inside of

the flanged tube and the drain hole on each of the two flanged tubes. Install and adjust the pressure seals. Do

this procedure again at the specified interval.

EFFECTIVITY

767-200, 767-300, and 767-300F airplanes. Refer to Paragraph 1.A.1., Airplanes, for the list of affected airplanes.

COMPLIANCE

Federal Aviation Administration (FAA) Notice of Proposed Rule Making NPRM 2005-NM-058-AD, is related to

this service bulletin.

Refer to Paragraph 1.E., Compliance.

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INDUSTRY SUPPORT INFORMATION

Boeing warranty remedies are not available for the maintenance procedure given in this service bulletin.

MANPOWER

Airplanes Total Task Hours Elapsed Hours

All 1.5 1.5

MATERIAL INFORMATION

None.

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BLANK PAGE
Commercial 

Airplanes 767

Service Bulletin

Number: 767-27-0204

Original Issue: January 27, 2005

Revision 2: August 16, 2011

ATA System: 2731

SUBJECT: FLIGHT CONTROLS - Elevator Control System - Seal Block Drain Hole Inspection

1. PLANNING INFORMATION

A. Effectivity

1. Airplanes

This service bulletin is for the airplane(s) shown below. Refer to PRR B12901-43S for data about

this change.

Refer to Service Bulletin Index Document D624T001 Part 3 for Airplane Variable Number, Line

Number, and Serial Number data.

GROUP CONFIGURATION DESCRIPTION

Airplanes Line Number 225-226, 228-717, and 719-971, except

767-200 AWACS.

1 -

2 - Airplanes line number 972-974

Airplane Models:

767-200, 767-300, 767-300F

Variable Number Group

VA713 - VA719 1

VB327 - VB332 1

VB441 - VB444 1

VE086 1

VE104 1

VE118 1

VE147 - VE152 1

VE171 - VE172 1

VF041 - VF042 1

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Variable Number Group

VF051 1

VF061 - VF062 1

VF071 - VF072 1

VF091 - VF093 1

VF101 - VF102 1

VF161 - VF162 1

VF171 - VF172 1

VF180 1

VF251 1

VK008 - VK016 1

VK046 - VK056 1

VK090 - VK113 1

VK131 - VK133 1

VK141 - VK148 1

VK161 - VK164 1

VK171 1

VK181 1

VK186 1

VL002 - VL006 1

VL701 - VL703 1

VL751 - VL755 1

VL806 - VL807 1

VL871 - VL873 1

VL891 - VL900 1

VL911 - VL914 1

VL931 - VL932 1

VL941 1

VN006 1

VN008 - VN041 1

VN055 - VN064 1

VN081 - VN099 1

VN111 - VN127 1

VN130 - VN137 1

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BOEING SERVICE BULLETIN 767-27-0204
Variable Number Group

VN151 - VN158 1

VN163 - VN168 1

VN171 - VN174 1

VN191 - VN198 1

VN211 - VN212 1

VN221 - VN225 1

VN231 - VN234 1

VN241 - VN243 1

VN251 - VN276 1

VN291 - VN293 1

VN301 - VN314 1

VN371 - VN372 1

VN376 1

VN381 - VN388 1

VN421 - VN427 1

VN436 1

VN471 - VN472 1

VN491 - VN513 1

VN531 - VN532 1

VN536 - VN537 1

VN541 - VN542 1

VN546 - VN547 1

VN551 1

VN556 - VN557 1

VN561 - VN562 1

VN631 - VN638 1

VN651 - VN658 1

VN671 - VN672 1

VN676 1

VN681 - VN691 1

VN731 - VN732 1

VN751 - VN753 1

VN791 - VN792 1

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BOEING SERVICE BULLETIN 767-27-0204
Variable Number Group

VN811 - VN813 1

VN921 - VN922 1

VN931 - VN936 1

VN951 - VN953 1

VN966 - VN972 1

VR051 - VR060 1

VR081 1

VR084 1

VR086 - VR089 1

VR106 - VR109 1

VR201 - VR211 1

VR251 1

VR256 - VR260 1

VR401 1

VR421 - VR423 1

VR426 1

VR441 1

VR461 1

VR471 - VR472 1

VS051 - VS056 1

VS061 1

VS066 - VS070 1

VS073 - VS078 1

VS091 - VS104 1

VS111 - VS113 1

VS131 - VS133 1

VS136 - VS137 1

VS176 - VS177 1

VS186 - VS187 1

VS196 - VS203 1

VS206 - VS208 1

VS211 1

VS216 - VS217 1

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BOEING SERVICE BULLETIN 767-27-0204
Variable Number Group

VS231 1

VS246 - VS248 1

VS261 - VS263 1

VS266 - VS274 1

VS291 - VS293 1

VS301 - VS303 1

VS306 - VS311 1

VS316 1

VS321 - VS324 1

VS331 - VS333 1

VS336 - VS337 1

VS366 - VS367 1

VS381 - VS382 1

VS391 - VS392 1

VS401 1

VS426 - VS428 1

VS466 - VS472 1

VS486 1

VS496 - VS497 1

VS506 - VS507 1

VS526 1

VS546 - VS549 1

VS701 - VS719 1

VS720 2

VS721 - VS735 1

VS751 - VS759 1

VS821 - VS825 1

VS841 - VS844 1

VS861 1

VS881 - VS883 1

VS891 1

VS896 1

VS901 - VS912 1

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BOEING SERVICE BULLETIN 767-27-0204
Variable Number Group

VS916 1

VS921 - VS922 2

VT501 1

VT511 - VT513 1

VT521 - VT523 1

VT531 - VT533 1

VV001 1

VW701 - VW721 1

VW851 1

2. Spares Affected

None.

B. Concurrent Requirements

Group 1:

The service bulletins listed below must be done before or at the same time as this service bulletin:

Group 1:

Company Service Bulletin Description

Elevator Control Cable Aft Pressure Bulkhead Seal Shield Flanged Tube Installation767-27A0219, Original Issue, or Revision 1The Boeing Company

Group 2:

None.

C. Reason

The related 767-400ER Boeing service bulletin is 767-27-0205.

The inspection given in this service bulletin will make sure that frozen moisture cannot collect in the

aft pressure seals for the elevator control cables.

The aft pressure seals for the elevator control cables help to keep the cabin pressurized. Two flanged

tubes hold the pressure seals to the rear bulkhead. A small drain hole in each of the two flanged tubes

keeps moisture away from the seals when the cabin is pressurized. If the drain hole is blocked, moisture

can collect in the tubes. If this occurs, the moisture can freeze when the external temperature decreases

during high-altitude flight. This frozen moisture can cause high resistance to the movement of the

control cables through the aft pressure seals.

This service bulletin gives instructions for a repetitive inspection of the two flanged tubes and drain

holes.

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BOEING SERVICE BULLETIN 767-27-0204
Boeing Service Related Problem (SRP) 767-SRP-27-0185 is related to this service bulletin. Refer to

Boeing Service Letter 767-SL-27-129 for customer reports about this problem.

Revision 1 is sent to change the service bulletin number 767-27A0192 to 767-27A0219. This is necessary

because the tube design in 767-27A0219 has replaced the design in 767-27A0192.

Revision 2 is sent to limit the effectivity of this service bulletin. Airplanes after line number 974 have a

configuration that is not affected if debris blocks the drain hole in the flanged tube.

D. Description

Remove the pressure seals from the flanged tubes for elevator control cables E1A and E1B. Do a

general visual inspection of the flanged tubes and drain holes to make sure they are clean. If necessary,

clean the inside of the flanged tube and the drain hole on each of the two flanged tubes. Install and

adjust the pressure seals. Do this procedure again at the specified interval.

Revision 1 - No more work is necessary on airplanes inspected in accordance with the original issue

of this service bulletin.

Revision 2 - No more work is necessary on airplanes inspected in accordance with the original issue

or revision 1 of this service bulletin. Continue to accomplish the repeat inspection at the intervals given

in Paragraph 1.E., Compliance.

The work in this service bulletin is done in the maintenance zone(s) given below.

Group 1:

Affected Maintenance Zones

Model Zone

767-200, 767-300, 767-300F 311

Group 2:

Affected Maintenance Zones

Model Zone

767-300 311

E. Compliance

Federal Aviation Administration (FAA) Notice of Proposed Rule Making NPRM 2005-NM-058-AD, is

related to this service bulletin.

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BOEING SERVICE BULLETIN 767-27-0204
Group 1:

Table 1: Compliance Time For Airplanes Affected By Boeing Service Bulletin 767-27A0219

Repeat Interval

(Not to Exceed)

Condition Action Compliance Time

Within 24 months after the accom- 24 months

plishment of the original issue or

Revision 1 of service bulletin 767-

27A0219.

Do the general visual

inspection of the

flanged tubes and

drain holes in accordance with the Accomplishment Instructions

All Airplanes

Clean the flanged Before further flight -

tube in accordance

with the Accomplishment Instructions

The inspection finds dirt,

loose particles, or blockage in a flanged tube

Clean the drain hole Before further flight -

in accordance with the

Accomplishment Instructions

The inspection finds dirt,

loose particles, or blockage in a drain hole

Group 2:

Table 2: Compliance Time For Airplanes Not Affected By Boeing Service Bulletin 767-27A0219

Repeat Interval

(Not to Exceed)

Compliance Time (Whichever

Occurs Later)

Condition Action

Within 24 24 months

months after the

date of issuance

of the original

standard certificate of airworthiness certificate

or the original

export certificate

of airworthiness.

Within 24

months after the

original issue

date on this service bulletin

Do the general visual inspection of the flanged

tubes and drain holes in

accordance with the Accomplishment Instructions

All airplanes

Before further - -

flight

Clean the flanged tube in

accordance with the Accomplishment Instructions

The inspection finds dirt,

loose particles, or blockage

in a flanged tube

Before further - -

flight

Clean the drain hole in

accordance with the Accomplishment Instructions

The inspection finds dirt,

loose particles, or blockage

in a drain hole

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BOEING SERVICE BULLETIN 767-27-0204
F. 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.

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.

G. Manpower

The table below shows an estimate of the task-hours necessary to do this change for each airplane.

This estimate is for direct labor only, done by an experienced crew. Adjust the estimate with operator

task-hour data if necessary. The estimate does not include lost time. These are some examples of lost

time:

— Time to adjust to the workplace

— Time to schedule the work

— Time to examine the work

— Time to cure the materials

— Time to make the parts

— Time to find the tools.

Elapsed

Hours

TaskHoursNumber of

Persons

Task

Open Access 1 0.25 0.25

Inspect Flanged Tubes 1 0.50 0.50

Clean Flanged Tubes 1 0.50 0.50

Close Access 1 0.25 0.25

TOTAL FOR EACH AIRPLANE 1.50 1.50

H. Weight and Balance Changes

None.

I. Electrical Load Data

Not changed.

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BOEING SERVICE BULLETIN 767-27-0204
J. References

1. Existing Data:

a. Engineering Change Memo PRR B12901-43S

b. Boeing Service Bulletin 767-27-0205, 767-27A0192, 767-27A0219

c. Boeing Service Letter 767-SL-27-129

d. Boeing Service Related Problem (SRP) 767-SRP-27-0185

e. Federal Aviation Administration (FAA) Notice of Proposed Rule Making (NPRM)

2005-NM-058-AD

f. 767 Aircraft Maintenance Manual (AMM) 06-42-00, 20-10-04

2. Data supplied with this Service Bulletin:

None.

3. Installation Drawings Used in the Preparation of this Service Bulletin:

None.

K. Publications Affected

1. Publications:

None.

2. Damage Tolerance Based Structural Inspections:

Boeing has evaluated the repairs and/or changes in this service bulletin for effects on Fatigue

Critical Structure (FCS) and for changes to Damage Tolerance Inspections (DTI) required in the

Maintenance Program. This service bulletin does not affect FCS, therefore DTIs are not necessary.

L. Interchangeability and Intermixability of Parts

Accomplishment of this service bulletin does not affect interchangeability or intermixability of parts.

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BOEING SERVICE BULLETIN 767-27-0204
2. MATERIAL INFORMATION

A. Material - Price and Availability

None.

B. Industry Support Information

Boeing warranty remedies are not available for the inspection and/or maintenance procedures given

in this service bulletin.

C. Parts Necessary For Each Airplane

1. Kits/Parts:

None.

2. Parts and Materials Supplied by the Operator:

None.

3. Parts Modified and Reidentified:

None.

4. Parts Removed and Not Replaced:

None.

D. Parts Necessary to Change Spares

None.

E. Special Tooling - Price and Availability

None.

F. Special Tooling Necessary to do this Service Bulletin

No special tools or equipment are necessary to do the change in this service bulletin. But, maintenance

and overhaul tools in the manuals given in Paragraph 1.J., References, can be necessary. Examine

operator tool supply to make sure all necessary tools are available.

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BOEING SERVICE BULLETIN 767-27-0204

BLANK PAGE
3. ACCOMPLISHMENT INSTRUCTIONS

A. GENERAL INFORMATION

CAUTION: KEEP THE WORK AREA, WIRES AND ELECTRICAL BUNDLES CLEAN OF METAL

PARTICLES OR CONTAMINATION WHEN YOU USE TOOLS. UNWANTED MATERIAL,

METAL PARTICLES OR CONTAMINATION CAUGHT IN WIRE BUNDLES CAN CAUSE

DAMAGE TO THE BUNDLES. DAMAGED WIRE BUNDLES CAN CAUSE SPARKS OR

OTHER ELECTRICAL DAMAGE.

NOTE: 1. Manual titles are referred to by acronyms. Refer to Paragraph 1.J., References, for

definition of the acronyms.

2. Obey all of the warnings and cautions given in the specified manual sections.

3. Unless shown differently, these dimensions and tolerances are used:

– Torque limits to tighten nuts and bolts are in SRM Chapter 51

4. Use the approved fastener and process material substitutions in accordance with

SRM Chapter 51.

5. If the length of any fastener specified in this service bulletin does not meet installation

standards given in SRM Chapter 51, then a fastener of the same specification, or

an approved substitute, with a length which meets the installation standards given

in SRM Chapter 51 may be used. In addition, washers may be installed for fastener

grip length in accordance with SRM Chapter 51.

6. These work instructions refer to procedures included in other Boeing documents.

When the words "refer to" are used and the operator has an accepted alternative

procedure, the accepted alternative procedure can be used. When the words "in

accordance with" are included in the instruction, the procedure in the Boeing document

must be used.

7. If it is necessary to remove more parts for access, you can remove those parts. If

you can get access without removing identified parts, it is not necessary to remove

all of the identified parts. Jacking and shoring limitations must be observed.

8. Where the work instructions include installation of a kept part, a new or serviceable

part with the same part number can be installed as an alternative to the kept part.

The removed part can be discarded if a new or serviceable part is installed.

9. A General Visual Inspection is defined as: A visual examination of an interior or

exterior area, installation or assembly to detect obvious damage, failure or irregularity.

This level of inspection is made from within touching distance unless otherwise

specified. A mirror may be necessary to enhance visual access to all exposed surfaces

in the inspection area. This level of inspection is made under normally available

lighting conditions such as daylight, hangar lighting, flashlight or drop-light and may

require removal or opening of access panels or doors. Stands, ladders or platforms

may be required to gain proximity to the area being checked.

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BOEING SERVICE BULLETIN 767-27-0204
B. WORK INSTRUCTIONS

1. Get access to the work area through door 312AR. Refer to 767 AMM 06-42-00 as an accepted

procedure.

2. Do the general visual inspection and cleaning of the flanged tubes and drain holes in accordance

with FIGURE 1.

3. Put the airplane back to a serviceable condition.

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BOEING SERVICE BULLETIN 767-27-0204
FIGURE 1: GENERAL VISUAL INSPECTION AND CLEANING OF THE FLANGED TUBES AND DRAIN

HOLES

(SHEET 1 OF 4)

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BOEING SERVICE BULLETIN 767-27-0204
FIGURE 1: GENERAL VISUAL INSPECTION AND CLEANING OF THE FLANGED TUBES AND DRAIN

HOLES

(SHEET 2 OF 4)

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BOEING SERVICE BULLETIN 767-27-0204
The step numbers shown below agree with the numbers shown in the circle symbols in the figure. The QTY

numbers shown below are the number of parts necessary for each airplane.

FIGURE 1: GENERAL VISUAL INSPECTION AND CLEANING OF THE FLANGED TUBES AND DRAIN

HOLES

(SHEET 3 OF 4)

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BOEING SERVICE BULLETIN 767-27-0204
CAUTION: THE DUCT LEAK DETECTOR LOOPS THAT ARE NEAR THE WORK AREA CAN BECOME

DAMAGED IF YOU BEND OR DISCONNECT THEM.

STEP TASK NAME QTY NOTES

1 Remove / Keep Pressure Seal 2 Refer to 767 AMM 20-10-04 as an accepted procedure.

Do a general visual inspection of the flanged tube for dirt,

loose particles, or blockage.

2 Inspect Flanged Tube 2

DO NOT USE WATER OR SOLVENTS

Do this step if the general visual inspection finds dirt, loose

particles, or blockage in the flanged tube. Use a brush that

will not cause damage to plastic surfaces or control cables.

As an alternative, you can use a lint free cloth.

3 Clean Flanged Tube 2

Do a general visual inspection of the drain hole for dirt, loose

particles, or blockage.

4 Inspect Drain Hole 2

DO NOT USE WATER OR SOLVENTS

Do this step if the general visual inspection finds dirt, loose

particles, or blockage in the drain hole. Use a small flexible

brush that will not cause damage to plastic surfaces or control

cables. As an alternative, you can use a lint free cloth.

5 Clean Drain Hole 2

6 Install (kept) Pressure Seal 2 Refer to 767 AMM 20-10-04 as an accepted procedure.

FIGURE 1: GENERAL VISUAL INSPECTION AND CLEANING OF THE FLANGED TUBES AND DRAIN

HOLES

(SHEET 4 OF 4)

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BOEING SERVICE BULLETIN 767-27-0204