**McDonnell Douglas** 

### Commercial **Airplanes** 

# MD90 Service Bulletin **Number: MD90-28-010** Original Issue: February 22, 2008 Revision 1: June 16, 2009 ATA System: 2800 **SUBJECT:** FUEL - Fuel Systems - Change or Replace Fuel Boost Pumps 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## BOEING PROPRIETARY, CONFIDENTIAL, AND/OR TRADE SECRET Copyright © 2008 The Boeing Company Unpublished Work - All Rights Reserved Boeing claims copyright in each page of this document only to the extent that the page contains copyrightable subject matter.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, 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BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: February 22, 2008 MD90-28-010 Revision 1: June 16, 2009 1 of 23 2.0BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: February 22, 2008 MD90-28-010 Revision 1: June 16, 2009 2 of 23 **BOEING SERVICE BULLETIN MD90-28-010**

BLANK PAGE**Table of Contents** Revision Transmittal Sheet ............................................ 5 Summary ..................................................... 7 1. PLANNING INFORMATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 A. Effectivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 1. Airplanes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 2. Spares Affected . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 B. Concurrent Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 C. Reason . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 D. Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 E. Compliance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 F. Approval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 G. Manpower . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 H. Weight and Balance Changes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 I. Electrical Load Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 J. References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 1. Existing Data:. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 2. Data supplied with this Service Bulletin: . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 3. Installation Drawings Used in the Preparation of this Service Bulletin:. . . . . . . . . . . 16 K. Publications Affected. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 L. Interchangeability and Intermixability of Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 2. MATERIAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 A. Material - Price and Availability. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 B. Industry Support Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 C. Parts Necessary For Each Airplane. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 1. Kits/Parts:. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 2. Parts and Materials Supplied by the Operator:. . . . . . . . . . . . . . . . . . . . . . . . 19 3. Parts Modified and Reidentified:. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 4. Parts Removed and Not Replaced: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 D. Parts Necessary to Change Spares. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 E. Special Tooling - Price and Availability. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 F. Special Tooling Necessary to do this Service Bulletin. . . . . . . . . . . . . . . . . . . . . . . 20 3. ACCOMPLISHMENT INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 A. GENERAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 B. WORK INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: February 22, 2008 MD90-28-010 Revision 1: June 16, 2009 3 of 23 **BOEING SERVICE BULLETIN MD90-28-010**BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: February 22, 2008 MD90-28-010 Revision 1: June 16, 2009 4 of 23 **BOEING SERVICE BULLETIN MD90-28-010**

BLANK PAGE**McDonnell Douglas** 

### Commercial **Airplanes** 

# MD90 Service Bulletin **Revision Transmittal Sheet Number: MD90-28-010**  Original Issue: February 22, 2008 Revision 1: June 16, 2009 ATA System: 2800 **SUBJECT:** FUEL - Fuel Systems - Change or Replace Fuel Boost Pumps This revision includes all pages of the service bulletin. **COMPLIANCE INFORMATION RELATED TO THIS REVISION** Federal Aviation Administration (FAA) Notice of Proposed Rule Making 2008-NM-113-AD, is related to this service bulletin. No more work is necessary on airplanes changed in accordance with the original issue of this service bulletin. **REASON FOR REVISION** This revision is sent to change the Revision level of Argo-Tech Service Bulletin 398000-28-2 to Revision 1. These sections were changed: 1. In Paragraph 1.B., Concurrent Requirements, changed Argo-Tech Service Bulletin Revision level. 2. In Paragraph 1.D., Description, added Affected Maintenance Zone Tables. 3. In Paragraph 1.E., Compliance, added Notice of Proposed Rule Making (NPRM) statements. 4. In Paragraph 1.F., Approval, added Revision 1. 5. In Paragraph 1.J.1., Existing Data, changed Argo-Tech Bulletin 398000-28-2 Revision level and added FAA Notice of Proposed Rule Making. 6. In Paragraph 1.K., Publication Affected, removed Special Compliance Item Report Revision level. 7. In Paragraph 2.E., Special Tooling - Price and Availability removed special tooling statement. 8. In Paragraph 2.F., Special Tooling Necessary to do this Service Bulletin, changed statement. 9. In Paragraph 3.B., Work Instructions, changed Argo-Tech Service Bulletin 398000-28-2 Revision level. 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.

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: February 22, 2008 MD90-28-010 Revision 1: June 16, 2009 5 of 23**REVISION HISTORY** February 22, 2008 Original Issue: June 16, 2009 Revision 1:

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: February 22, 2008 MD90-28-010 Revision 1: June 16, 2009 6 of 23 **BOEING SERVICE BULLETIN MD90-28-010 McDonnell Douglas**  

### Commercial **Airplanes** 

# MD90 Service Bulletin **Summary Number: MD90-28-010**  Original Issue: February 22, 2008 Revision 1: June 16, 2009 ATA System: 2800 **SUBJECT:** FUEL - Fuel Systems - Change or Replace Fuel Boost Pumps **CONCURRENT REQUIREMENTS** Refer to Paragraph 1.B., Concurrent Requirements. **BACKGROUND** The Special Federal Aviation Regulation (SFAR 88) safety review has determined the need to protect the fuel boost pump stator lead wires from being able to contact the pump rotor/shaft assembly. Lead wire contact and the resulting chafing may result in an ignition source (energized rotor assembly) being produced in the fuel boost pump inlet that could propagate into the fuel tank when the fuel boost pump inlet is not fully covered by fuel. Replacement of the fuel boost pump will minimize the risk of a potential arc/spark condition that may occur within the airplane's fuel tanks at critical fuel boost pumps in the center wing and forward auxiliary tanks. If not corrected, there is a potential that an arc/spark condition could occur within the fuel boost pumps and propagate into the fuel tank. This service bulletin is the result of the safety assessments conducted by Boeing under SFAR 88, "Fuel Tank System Fault Tolerance Evaluation Requirements". **ACTION** Refer to Paragraph 1.D., Description. **EFFECTIVITY** MD-90-30 Airplanes. Refer to Paragraph 1.A.1., Airplanes for the list of affected airplanes. **COMPLIANCE** Federal Aviation Administration (FAA) Notice of Proposed Rule Making 2008-NM-113-AD, is related to this service bulletin. Boeing recommends accomplishment of this service bulletin within 5 years after original issue date of service bulletin **INDUSTRY SUPPORT INFORMATION** Boeing warranty remedies are not available for the configuration changes given in this service bulletin.

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: February 22, 2008 MD90-28-010 Revision 1: June 16, 2009 7 of 23**MANPOWER Group 1, Configuration 1-2:**  Elapsed Hours Total Task Hours Airplanes *3.0 *3.0 MD-90-30 **Group 2, Configuration 1-2:** Elapsed Hours Total Task Hours Airplanes *4.5 *4.5 MD-90-30* The manpower required to change fuel boost pump in accordance with Argo-Tech Service Bulletin listed in Paragraph 1.J.1., Existing Data are not included.
**MATERIAL INFORMATION** Refer to Paragraph 2.A., Material - Price and Availability.

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: February 22, 2008 MD90-28-010 Revision 1: June 16, 2009 8 of 23 **BOEING SERVICE BULLETIN MD90-28-010**BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: February 22, 2008 MD90-28-010 Revision 1: June 16, 2009 9 of 23 **BOEING SERVICE BULLETIN MD90-28-010**BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: February 22, 2008 MD90-28-010 Revision 1: June 16, 2009 10 of 23 **BOEING SERVICE BULLETIN MD90-28-010**

BLANK PAGE**McDonnell Douglas** 

### Commercial **Airplanes** 

# MD90 Service Bulletin **Number: MD90-28-010** Original Issue: February 22, 2008 Revision 1: June 16, 2009 ATA System: 2800 **SUBJECT:** FUEL - Fuel Systems - Change or Replace Fuel Boost Pumps
**1. PLANNING INFORMATION A. Effectivity**  1. Airplanes This service bulletin is for the airplanes shown below.
**DESCRIPTION CONFIGURATION**  **GROUP** Change or replace fuel boost pumps on center wing tank.

- 1 Applicable to airplanes with fuel boost pump 398000-1. 1 Applicable to airplanes with fuel boost pump 65-5093-4. 2 Change or replace fuel boost pumps on center wing and forward auxiliary tanks. - 2

Applicable to airplanes with fuel boost pump 398000-1. 1 Applicable to airplanes with fuel boost pump 65-5093-4. 2

Airplane Models: MD-90-30 **Group Fuselage Num-**  **ber** 1 2094 - 2100 1 2115 1 2117 1 2120 1 2122 - 2123

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: February 22, 2008 MD90-28-010 Revision 1: June 16, 2009 11 of 23**Group Fuselage Num-**  **ber** 1 2125 - 2126 1 2129 1 2131 1 2133 1 2136 1 2138 1 2140 - 2144 1 2146 - 2147 1 2149 - 2150 1 2153 - 2154 1 2156 - 2159 1 2161 - 2166 1 2169 - 2171 1 2173 1 2175 1 2177 1 2179 1 2181 - 2182 1 2184 1 2186 1 2190 - 2191 1 2193 - 2194 2 2195 1 2197 - 2198 1 2200 1 2202 - 2203 1 2205 1 2207 1 2209 - 2213 1 2215 - 2217 1 2219 - 2233 1 2235 - 2237

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: February 22, 2008 MD90-28-010 Revision 1: June 16, 2009 12 of 23 **BOEING SERVICE BULLETIN MD90-28-010 Group**  **Fuselage Num- ber**  1 2240 2 2243 1 2245 1 2248 1 2250 - 2251 1 2253 1 2255 - 2263 1 2288 - 2290 1 4001 - 4002 2. Spares Affected **Group 1-2, Configuration 1:** Examine your spares supply for the parts or components identified in Paragraph 2.D., Parts Necessary to Change Spares. If any parts or components are found, refer to Paragraph 2.D for spares modification information. **Group 1-2, Configuration 2:** None. **B. Concurrent Requirements Group 1-2, Configuration 1:** **The service bulletin listed below must be done at the same time as this service bul letin:**  **Description Service Bulletin**  **Company** Change or replace fuel boost pump 398000- 1 to 398000-2 configuration. 398000-28-2 Revision 1 Argo-Tech Argo-Tech Corporation A copy may be ob- tained from: 23555 Euclid Avenue Cleveland, Ohio 44117 USA Phone: (216) 692-7151 **Group 1-2, Configuration 2:** None.

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: February 22, 2008 MD90-28-010 Revision 1: June 16, 2009 13 of 23 **BOEING SERVICE BULLETIN MD90-28-010 C. Reason**  The Special Federal Aviation Regulation (SFAR 88) safety review has determined the need to protect the fuel boost pump stator lead wires from being able to contact the pump rotor/shaft assembly. Lead wire contact and the resulting chafing may result in an ignition source (energized rotor assembly) being produced in the fuel boost pump inlet that could propagate into the fuel tank when the fuel boost pump inlet is not fully covered by fuel. Replacement of the fuel boost pump will minimize the risk of a potential arc/spark condition that may occur within the airplane's fuel tanks at critical fuel boost pumps in the center wing and forward auxiliary tanks. If not corrected, there is a potential that an arc/spark condition could occur within the fuel boost pumps and propagate into the fuel tank. This service bulletin is the result of the safety assessments conducted by Boeing under SFAR 88, "Fuel Tank System Fault Tolerance Evaluation Requirements". Revision 1 is sent to change the Revision level of Argo-Tech Service Bulletin 398000-28-2 to Revision 1. **D. Description Group 1, Configuration 1:**  This service bulletin provides instructions to change fuel boost pumps on center wing tank in accordance with Argo-Tech Service Bulletin listed in Paragraph 1.J.1., Existing Data or replace with part number 398000-2. **Group 1, Configuration 2:** This service bulletin provides instructions to replace fuel boost pumps on center wing tank with part number 398000-2. **Group 2, Configuration 1:** This service bulletin provides instructions to change fuel boost pumps on center wing and forward auxiliary tanks in accordance with Argo-Tech Service Bulletin listed in Paragraph 1.J.1., Existing Data or replace with part number 398000-2. **Group 2, Configuration 2:** This service bulletin provides instructions to replace fuel boost pumps on center wing and forward auxiliary tanks with part number 398000-2. Revision 1 - No more work is necessary on airplanes changed in accordance with the original issue of this service bulletin. The work in this service bulletin is done in the maintenance zone(s) given below. **Group 1:**
**Affected Maintenance Zones Zone**  **Model** 621 MD-90-30

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: February 22, 2008 MD90-28-010 Revision 1: June 16, 2009 14 of 23 **BOEING SERVICE BULLETIN MD90-28-010 Group 2:** 
**Affected Maintenance Zones Zone**  **Model** 222, 621 MD-90-30 **E. Compliance** Federal Aviation Administration (FAA) Notice of Proposed Rule Making 2008-NM-113-AD, is related to this service bulletin. Boeing recommends accomplishment of this service bulletin within 5 years after original issue date of service bulletin. **F. Approval** The resultant modification described in Paragraph 1.D has been shown to comply with the applicable Federal Aviation Regulations and Revision 1 is approved by the Manager, Los Angeles Aircraft Certification Office, FAA Northwest Mountain Region. **G. Manpower** The table below shows an estimate of the task hours necessary to do this modification 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. **Group 1, Configuration 1-2: Elapsed Hours**  **Task Hours Number of Persons**  **Task** 0.5 0.5 1 Open Access 1.0 1.0 1 Change or replace 0.5 0.5 1 Close Access 1.0 1.0 1 Functional Test 3.0 3.0 TOTAL FOR EACH AIRPLANE **Group 2, Configuration 1-2: Elapsed Hours**  **Task Hours Number of Persons**  **Task** 1.0 1.0 1 Open Access 1.5 1.5 1 Change or replace

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: February 22, 2008 MD90-28-010 Revision 1: June 16, 2009 15 of 23 **BOEING SERVICE BULLETIN MD90-28-010 Group 2, Configuration 1-2:**  **Elapsed Hours Task Hours**  **Number of Persons Task**  1.0 1.0 1 Close Access 1.0 1.0 1 Functional Test 4.5 4.5 TOTAL FOR EACH AIRPLANE The manpower required to change fuel boost pump in accordance with Argo-Tech Service Bulletin listed in Paragraph 1.J.1., Existing Data are not included. **H. Weight and Balance Changes** None. **I. Electrical Load Data** Not changed. **J. References** 1. Existing Data: a. Argo-Tech Service Bulletin 398000-28-2 Revision 1. b. Federal Aviation Administration, Special Federal Aviation Regulation (SFAR) 88. c. FAA Notice of Proposed Rule Making 2008-NM-113-AD. d. MD-90 Aircraft Maintenance Manual (AMM) 28-22-01. 2. Data supplied with this Service Bulletin: None. 3. Installation Drawings Used in the Preparation of this Service Bulletin: **Change Title**  **Drawing Number** New Replacement Installation - Fuel Pump SR90280005 This drawing is used to prepare this service bulletin. This drawing is not necessary to make the specified changes, and is not supplied with this service bulletin.This drawing may not be applicable to all airplane configurations or operators. **K. Publications Affected Chapter-Section**  **Publication** 28-22 and 28-23 Illustrated Parts Catalog MDC-92K9145 (CDCCL 28-2) Special Compliance Item Report 28-20-6 Supplier Component Maintenance Manual

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: February 22, 2008 MD90-28-010 Revision 1: June 16, 2009 16 of 23 **BOEING SERVICE BULLETIN MD90-28-010 L. Interchangeability and Intermixability of Parts**  The new fuel boost pump part number 398000-2 is the only part number that may be installed in the center wing tank and forward auxiliary tank. The new fuel boost pump part number 398000-2 may also be installed in all other tanks as an alternate part number.

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: February 22, 2008 MD90-28-010 Revision 1: June 16, 2009 17 of 23 **BOEING SERVICE BULLETIN MD90-28-010**BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: February 22, 2008 MD90-28-010 Revision 1: June 16, 2009 18 of 23 **BOEING SERVICE BULLETIN MD90-28-010**

BLANK PAGE**2. MATERIAL INFORMATION A. Material - Price and Availability**  Refer to Argo-Tech Service Bulletin listed in Paragraph 1.J.1., Existing Data. **B. Industry Support Information** Boeing warranty remedies are not available for the configuration changes given in this service bulletin. **C. Parts Necessary For Each Airplane** 1. Kits/Parts: **Group 1-2, Configuration 1:** Refer to Argo-Tech Service Bulletin listed in Paragraph 1.J.1., Existing Data.

**Group 1, Configuration 2: Existing Part Number**  **Name QTY**  **New Part Number** 65-5093-4 Fuel Boost Pump 2 398000-2 **Group 2, Configuration 2: Existing Part Number**  **Name QTY**  **New Part Number** 65-5093-4 Fuel Boost Pump 4 398000-2 2. Parts and Materials Supplied by the Operator: **Group 1-2, Configuration 1:** Refer to Argo-Tech Service Bulletin listed in Paragraph 1.J.1., Existing Data. **Group 1-2, Configuration 2:** None. 3. Parts Modified and Reidentified: **Group 1-2, Configuration 1:** Refer to Argo-Tech Service Bulletin listed in Paragraph 1.J.1., Existing Data. **Group 1-2, Configuration 2:** None. 4. Parts Removed and Not Replaced: **Group 1-2, Configuration 1:** Refer to Argo-Tech Service Bulletin listed in Paragraph 1.J.1., Existing Data. **Group 1-2, Configuration 2:** None.

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: February 22, 2008 MD90-28-010 Revision 1: June 16, 2009 19 of 23 **BOEING SERVICE BULLETIN MD90-28-010 D. Parts Necessary to Change Spares**  **Group 1-2, Configuration 1:** Refer to Argo-Tech Service Bulletin listed in Paragraph 1.J.1., Existing Data. **Group 1-2, Configuration 2:** 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: February 22, 2008 MD90-28-010 Revision 1: June 16, 2009 20 of 23 **BOEING SERVICE BULLETIN MD90-28-010 3. ACCOMPLISHMENT INSTRUCTIONS**  **A. GENERAL INFORMATION W** 

**ARNING:** IF ELECTRICAL POWER IS APPLIED TO THE AIRPLANE, MAKE SURE YOU OBEY ALL PRECAUTIONS WHILE YOU DO WORK. IF YOU DO NOT OBEY THE PRECAUTIONS, DEATH OR INJURY TO PERSONS, AND DAMAGE TO THE AIRPLANE CAN OCCUR. **CA UTION:**  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. **CA UTION:**  ELECTRICALLY GROUND THE AIRPLANE. THIS WILL HELP TO PREVENT DAMAGE TO THE AIRPLANE OR EQUIPMENT. **NO TE:**  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. 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. **B. WORK INSTRUCTIONS Group 1, Configuration 1:**  1. Open access panel 620AT. Refer to MD-90 AMM 28-22-01. 2. Remove center wing tank fuel boost pumps in accordance with MD-90 AMM 28-22-01. 3. Change or replace the fuel boost pumps in accordance with Argo-Tech Service Bulletin 398000-28-2 Revision 1. 4. Install center wing tank fuel boost pumps part number 398000-2 in accordance with MD-90 AMM 28-22-01. 5. Close access panel 620AT. Refer to MD-90 AMM 28-22-01. 6. Do an operational test of the center wing tank fuel boost pumps in accordance with MD-90 AMM 28-22-01. 7. Put the airplane back to a serviceable condition.
**Group 1, Configuration 2:**

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: February 22, 2008 MD90-28-010 Revision 1: June 16, 2009 21 of 23 **BOEING SERVICE BULLETIN MD90-28-010**1. Open access panel 620AT. Refer to MD-90 AMM 28-22-01. 2. Replace center wing tank fuel boost pumps with part number 398000-2 in accordance with MD-90 AMM 28-22-01. 3. Close access panel 620AT. Refer to MD-90 AMM 28-22-01. 4. Do an operational test of the center wing tank fuel boost pumps in accordance with MD-90 AMM 28-22-01. 5. Put the airplane back to a serviceable condition. **Group 2, Configuration 1:** 1. Open access panels 620AT, 222CF, 222FF, and 222HF. Refer to MD-90 AMM 28-22-01. 2. Remove center wing tank fuel boost pumps in accordance with MD-90 AMM 28-22-01. 3. Remove forward auxiliary tank fuel boost pumps in accordance with MD-90 AMM 28-22-01. 4. Change or replace the fuel boost pumps in accordance with Argo-Tech Service Bulletin 398000-28-2 Revision 1. 5. Install center wing tank fuel boost pumps part number 398000-2 in accordance with MD-90 AMM 28-22-01. 6. Install forward auxiliary tank fuel boost pumps part number 398000-2 in accordance with MD-90 AMM 28-22-01. 7. Close access panel 620AT. Refer to MD-90 AMM 28-22-01. 8. Do an operational test on the center wing and forward auxiliary tank fuel boost pumps in accordance with MD-90 AMM 28-22-01. 9. Close access panels 222CF, 222FF, and 222HF. Refer to MD-90 AMM 28-22-01. 10. Put the airplane back to a serviceable condition. **Group 2, Configuration 2:** 1. Open access panels 620AT, 222CF, 222FF, and 222HF. Refer to MD-90 AMM 28-22-01. 2. Replace center wing tank fuel boost pumps with part number 398000-2 in accordance with MD-90 AMM 28-22-01. 3. Replace forward auxiliary tank fuel boost pumps with part number 398000-2 in accordance with MD-90 AMM 28-22-01. 4. Close access panel 620AT. Refer to MD-90 AMM 28-22-01.

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: February 22, 2008 MD90-28-010 Revision 1: June 16, 2009 22 of 23 **BOEING SERVICE BULLETIN MD90-28-010**5. Do an operational test on the center wing and forward auxiliary tank fuel boost pumps in accordance with MD-90 AMM 28-22-01. 6. Close access panels 222CF, 222FF, and 222HF. Refer to MD-90 AMM 28-22-01. 7. Put the airplane back to a serviceable condition.

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: February 22, 2008 MD90-28-010 Revision 1: June 16, 2009 23 of 23 **BOEING SERVICE BULLETIN MD90-28-010**