### Commercial **Airplanes** 

# 767 Service Bulletin
**Number: 767-27-0205** Original Issue: January 27, 2005 Revision 2: August 30, 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. 9E991 ECCN: 

## BOEING PROPRIETARY, CONFIDENTIAL, AND/OR TRADE SECRET Copyright © 2005 The Boeing Company Unpublished Work - All Rights Reserved Boeing claims copyright in each page of this document only to the extent that the page contains copyrightable subject matter.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, BBJ, DC-8, DC-9, DC-10, KC-10, KDC-10, MD-10, MD-11, MD-80, MD-88, MD-90, P-8A, Poseidon and the Boeing livery are all trademarks owned by The Boeing Company; and no trademark license is granted in connection with this document unless provided in writing by Boeing.

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 27, 2005 767-27-0205 Revision 2: August 30, 2011 1 of 24 3.0BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 27, 2005 767-27-0205 Revision 2: August 30, 2011 2 of 24 **BOEING SERVICE BULLETIN 767-27-0205**

BLANK PAGE**Table of Contents** Revision Transmittal Sheet ............................................ 5 Summary...................................................... 7 1. PLANNING INFORMATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 A. Effectivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 1. Airplanes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 2. Spares Affected . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 B. Concurrent Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 C. Reason . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 D. Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 E. Compliance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 F. Approval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 G. Manpower . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 H. Weight and Balance Changes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 I. Electrical Load Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 J. References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 1. Existing Data: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 2. Data supplied with this Service Bulletin: . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 3. Installation Drawings Used in the Preparation of this Service Bulletin:. . . . . . . . . . . 14 K. Publications Affected . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 L. Interchangeability and Intermixability of Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 2. MATERIAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 A. Material - Price and Availability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 B. Industry Support Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 C. Parts Necessary For Each Airplane. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 1. Kits/Parts: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 2. Parts and Materials Supplied by the Operator:. . . . . . . . . . . . . . . . . . . . . . . . 17 3. Parts Modified and Reidentified: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 4. Parts Removed and Not Replaced:. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 D. Parts Necessary to Change Spares. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 E. Special Tooling - Price and Availability. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 F. Special Tooling Necessary to do this Service Bulletin. . . . . . . . . . . . . . . . . . . . . . . 17 3. ACCOMPLISHMENT INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 A. GENERAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 B. WORK INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 FIGURE 1: GENERAL VISUAL INSPECTION AND CLEANING OF THE FLANGED TUBES AND DRAIN HOLES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 27, 2005 767-27-0205 Revision 2: August 30, 2011 3 of 24 **BOEING SERVICE BULLETIN 767-27-0205**BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 27, 2005 767-27-0205 Revision 2: August 30, 2011 4 of 24 **BOEING SERVICE BULLETIN 767-27-0205**

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### Commercial **Airplanes** 

# 767 Service Bulletin **Revision Transmittal Sheet Number: 767-27-0205**  Original Issue: January 27, 2005 Revision 2: August 30, 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: 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 condition. The compliance data for airplanes not affected by the concurrent service bulletin are removed. A reference to the NPRM is added. 7. Paragraph 1.J., References: A reference to the NPRM 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.

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 27, 2005 767-27-0205 Revision 2: August 30, 2011 5 of 2410. 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** January 27, 2005 Original Issue: February 12, 2009 Revision 1: August 30, 2011 Revision 2:

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 27, 2005 767-27-0205 Revision 2: August 30, 2011 6 of 24 **BOEING SERVICE BULLETIN 767-27-0205**

### Commercial **Airplanes** 

# 767 Service Bulletin **Summary Number: 767-27-0205**  Original Issue: January 27, 2005 Revision 2: August 30, 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 767-200, 767-300, and 767-300F Boeing service bulletin is 767-27-0204. 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** 767-400ER Airplane(s). Refer to Paragraph 1.A.1., Airplanes, for the list of affected airplane(s). **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.

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 27, 2005 767-27-0205 Revision 2: August 30, 2011 7 of 24**INDUSTRY SUPPORT INFORMATION** Boeing warranty remedies are not available for the maintenance procedure given in this service bulletin. **MANPOWER Elapsed Hours**  **Total Task Hours Airplanes**  1.5 1.5 All
**MATERIAL INFORMATION** None.

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 27, 2005 767-27-0205 Revision 2: August 30, 2011 8 of 24 **BOEING SERVICE BULLETIN 767-27-0205**BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 27, 2005 767-27-0205 Revision 2: August 30, 2011 9 of 24 **BOEING SERVICE BULLETIN 767-27-0205**BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 27, 2005 767-27-0205 Revision 2: August 30, 2011 10 of 24 **BOEING SERVICE BULLETIN 767-27-0205**

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### Commercial **Airplanes** 

# 767 Service Bulletin
**Number: 767-27-0205** Original Issue: January 27, 2005 Revision 2: August 30, 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.
**DESCRIPTION CONFIGURATION**  **GROUP** 767-400ER airplanes line number 758-965

- 1

Airplane Models: 767-400ER **Group Variable Number**  1 VQ001 - VQ021 1 VQ071 - VQ086 1 VQ111 2. Spares Affected None. **B. Concurrent Requirements Description**  **Service Bulletin Company**  Elevator Control Cable Aft Pressure Bulkhead Seal Shield Flanged Tube Installation767-27A0219, Original Issue, or Revision 1 The Boeing Company

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 27, 2005 767-27-0205 Revision 2: August 30, 2011 11 of 24**C. Reason** The related 767-200, 767-300, and 767-300F Boeing service bulletin is 767-27-0204. 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. Revision 1 is sent to change the service bulletin number 767-27A0193 to 767-27A0219. This is necessary because the tube design in 767-27A0219 has replaced the design in 767-27A0193. 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 changed as shown in 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.
**Affected Maintenance Zones Zone**  **Model** 311 767-400ER **E. Compliance** Federal Aviation Administration (FAA) Notice of Proposed Rule Making NPRM 2005-NM-058-AD, is related to this service bulletin.

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 27, 2005 767-27-0205 Revision 2: August 30, 2011 12 of 24 **BOEING SERVICE BULLETIN 767-27-0205**Boeing recommends that operators accomplish this bulletin as specified in Table 1 below. **Table 1: Compliance Time Repeat Interval**  **(Not to Exceed) Compliance Time**  **Action Condition** 

24 months Within 24 months after the accom- plishment of the original issue or Revision 1 of service bulletin 767- 27A0219. Do the general visual inspection of the flanged tubes anddrain holes in accordance with the Accomplishment Instructions All Airplanes

- Before further flight Clean the flanged tube in accordancewith 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 theAccomplishment Instructions The inspection finds dirt,loose particles, or blockage in a drain hole

**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.

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 27, 2005 767-27-0205 Revision 2: August 30, 2011 13 of 24 **BOEING SERVICE BULLETIN 767-27-0205 Elapsed**  **Hours Task**  **Hours Number of**  **Persons Task** 

0.25 0.25 1 Open Access 0.50 0.50 1 Inspect Flanged Tubes 0.50 0.50 1 Clean Flanged Tubes 0.25 0.25 1 Close Access 1.50 1.50 TOTAL FOR EACH AIRPLANE **H. Weight and Balance Changes** None. **I. Electrical Load Data** Not changed. **J. References** 1. Existing Data: a. Engineering Change Memo PRR B12901-43S b. Boeing Service Bulletin 767-27-0204, 767-27A0193, 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. 767-400 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 PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 27, 2005 767-27-0205 Revision 2: August 30, 2011 14 of 24 **BOEING SERVICE BULLETIN 767-27-0205**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.

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 27, 2005 767-27-0205 Revision 2: August 30, 2011 15 of 24 **BOEING SERVICE BULLETIN 767-27-0205**BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 27, 2005 767-27-0205 Revision 2: August 30, 2011 16 of 24 **BOEING SERVICE BULLETIN 767-27-0205**

BLANK PAGE**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.

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 27, 2005 767-27-0205 Revision 2: August 30, 2011 17 of 24 **BOEING SERVICE BULLETIN 767-27-0205**BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 27, 2005 767-27-0205 Revision 2: August 30, 2011 18 of 24 **BOEING SERVICE BULLETIN 767-27-0205**

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 given in 767 Structural Repair Manual, 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.

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 27, 2005 767-27-0205 Revision 2: August 30, 2011 19 of 24 **BOEING SERVICE BULLETIN 767-27-0205 B. WORK INSTRUCTIONS**  1. Get access to the work area through door 312AR. Refer to 767-400 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.

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 27, 2005 767-27-0205 Revision 2: August 30, 2011 20 of 24 **BOEING SERVICE BULLETIN 767-27-0205 FIGURE 1: GENERAL VISUAL INSPECTION AND CLEANING OF THE FLANGED TUBES AND DRAIN**  **HOLES (SHEET 1 OF 4)** 

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 27, 2005 767-27-0205 Revision 2 August 30, 2011 21 of 24 **BOEING SERVICE BULLETIN 767-27-0205 FIGURE 1: GENERAL VISUAL INSPECTION AND CLEANING OF THE FLANGED TUBES AND DRAIN**  **HOLES (SHEET 2 OF 4)** 

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 27, 2005 767-27-0205 Revision 2 August 30, 2011 22 of 24 **BOEING SERVICE BULLETIN 767-27-0205**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)**

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 27, 2005 767-27-0205 Revision 2 August 30, 2011 23 of 24 **BOEING SERVICE BULLETIN 767-27-0205 CAUTION:**  THE DUCT LEAK DETECTOR LOOPS THAT ARE NEAR THE WORK AREA CAN BECOME DAMAGED IF YOU BEND OR DISCONNECT THEM.
**NOTES QTY**  **NAME TASK**  **STEP** Refer to 767-400 AMM 20-10-04 as an accepted procedure. 2 Pressure Seal Remove / Keep 1 Do a general visual inspection of the flanged tube for dirt, loose particles, or blockage. 2 Flanged Tube Inspect 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. 2 Flanged Tube Clean 3

Do a general visual inspection of the drain hole for dirt, loose particles, or blockage. 2 Drain Hole Inspect 4
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 brush that will not cause damage to plastic surfaces or control cables. As an alternative, you can use a lint free cloth. 2 Drain Hole Clean 5

Refer to 767-400 AMM 20-10-04 as an accepted procedure. 2 Pressure Seal Install (kept) 6

**FIGURE 1: GENERAL VISUAL INSPECTION AND CLEANING OF THE FLANGED TUBES AND DRAIN HOLES**  **(SHEET 4 OF 4)**

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 27, 2005 767-27-0205 Revision 2 August 30, 2011 24 of 24 **BOEING SERVICE BULLETIN 767-27-0205**