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December 15, 1971 Revision 1: December 18, 2003 747-28A2033 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 1o f4 8
ALERT ALERT Commercial Airplane Group 747
ALERTALERT Service Bulletin Number: 747-28A2033 Date: December 15, 1971 Revision 1: December 18, 2003 ATA System: 2820 SFB SUBJECT: FUEL - Pump-Motor Housing External Bonding Jumper Installation
BOEING PROPRIETARY, CONFIDENTIAL, AND/OR TRADE SECRET Copyright © 1989 The Boeing Company Unpublished Work - All Rights Reserved Boeing claims copyright in each page of this document only to the extent that the page contains copyrightable subject matter.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, BBJ, DC-8, DC-9, DC-10, MD-10, MD-11, MD-80, MD-88, MD-90, and the red-white-and-blue 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.
BLANK PAGE December 15, 1971 Revision 1: December 18, 2003 747-28A2033 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 2 of 48 BOEING SERVICE BULLETIN 747-28A2033
ALERT ALERT
BLANK PAGE
December 15, 1971 Revision 1: December 18, 2003 747-28A2033 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 3o f4 8
ALERT ALERT Commercial Airplane Group 747
ALERTALERT Service Bulletin Number: 747-28A2033 Revision Transmittal Sheet Date: December 15, 1971 Revision 1: December 18, 2003 ATA System: 2820 SFB SUBJECT: FUEL - Pump-Motor Housing External Bonding Jumper Installation This revision includes all pages of the service bullletin.
COMPLIANCE INFORMATION RELATED TO THIS REVISION No more work is necessary on airplanes changed as shown in the initial release of this service bulletin.
REASON FOR REVISION This revision is a result of SFAR 88, and is issued to change the service bulletin type from Standard to Alert and provide a recommended compliance time. The technical content and intent of the service bulletin has not changed, but basic format changes developed since the original issue of the bulletin have been incorporated in this revision.
Paragraph 1.A., Effectivity, shows changes of airplane operators. Each operator should examine the Effectivity paragraph for changes.
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: December 15, 1971 Revision 1: December 18, 2003
BLANK PAGE December 15, 1971 Revision 1: December 18, 2003 747-28A2033 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 4 of 48 BOEING SERVICE BULLETIN 747-28A2033
ALERT ALERT
BLANK PAGE
December 15, 1971 Revision 1: December 18, 2003 747-28A2033 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 5o f4 8
ALERT ALERT Commercial Airplane Group 747
ALERTALERT Service Bulletin Number: 747-28A2033 Summary Date: December 15, 1971 Revision 1: December 18, 2003 ATA System: 2820 SFB SUBJECT: FUEL - Pump-Motor Housing External Bonding Jumper Installation
THIS BULLETIN IS SENT TO THE OPERATORS OF RECORD OF THE AIRPLANES SHOWN IN PARAGRAPH 1.A., EFFECTIVITY. IF AN AIRPLANE HAS BEEN LEASED OR SOLD, SEND THIS SERVICE BULLETIN TO THE NEW OPERATOR. IF APPLICABLE SPARES HAVE BEEN SOLD, SEND THIS SERVICE BULLETIN TO THE NEW OWNER.
CONCURRENT REQUIREMENTS None.
BACKGROUND There are eight boost pumps, four jettison pumps and two override/jettison pumps installed in the fuel system.
Pump motors are installed into the pump housing from outside the tanks. All pump housings are directly bolted to aircraft structure and provide tank closure; however, the tank interior, including pump mounting flanges, have a special corrosion protection finish. This finish provides limited electrical bonding and supplementary bonds are required to reduce pump housing to structure voltage during electrical fault conditions. Two supplementary bonding paths are presently provided: one inside the tank from the pump housing to structure and the other from the pump motor case to a ground through the connector.
Based on re-evaluation of this combined current path bonding arrangement, it has been determined that the electrical bonding resistance of these fuel pumps should be reduced. To further ensure mechanical and electrical bonding integrity, it is desirable to install bonding external to the tanks between the pump motor housing and aircraft structure.
This service bulletin revision is the result of SFAR 88. Boeing has conducted a one time engineering evaluation on the airplane fuel tank system design. Based on engineering analysis of the fuel tank system design, Boeing has reached a safety determination for the condition described in this service bulletin. The service bulletin type is changed from Standard to Alert as a result of this safety determination.
ACTION (PRR 75357) Part 1: Install a bonding jumper from each pump housing to airplane structure outside of the fuel tanks.
Part 2 (Optional): Remove the bonding jumper from each pump housing to structure that is installed inside the fuel tanks.
December 15, 1971 Revision 1: December 18, 2003 747-28A2033 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 6 of 48 BOEING SERVICE BULLETIN 747-28A2033
ALERT ALERT
EFFECTIVITY All 747 airplanes line numbers 1 - 167.
COMPLIANCE Boeing recommends that operators incorporate Part 1 of this service bulletin within 5 years after the issue date of this revision.
INDUSTRY SUPPORT INFORMATION Boeing warranty remedies are not available for the configuration changes given in this service bulletin.
MANPOWER
MATERIAL INFORMATION Boeing Supplied Kits/Parts.
Refer to Paragraph 2.A., Material - Price and Availability.
Airplanes Total Task Hours Elapsed Hours All (Part 1) 8.0 8.0 All (Part 2) 8.0 8.0
December 15, 1971 Revision 1: December 18, 2003 747-28A2033 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 7o f4 8 BOEING SERVICE BULLETIN 747-28A2033
ALERT ALERT
LEFT SIDE SHOWN,
RIGHT SIDE OPPOSITE
MAIN TANK BOOST
BOOST PUMPS
JUMPER ON MAIN TANK
BONDING JUMPER FROM PART 2: (OPTIONAL) REMOVE PART 1: INSTALL BONDING PUMPS
MAIN TANK BOOST
BOOST PUMPS
JUMPER ON MAIN TANK
BONDING JUMPER FROM PART 2: (OPTIONAL) REMOVE PART 1: INSTALL BONDING PUMPS
JETTISON OVERRIDE
BONDING JUMPER FROM PART 2: (OPTIONAL) REMOVE
OVERRIDE PUMPS
JUMPER ON JETTISON PART 1: INSTALL BONDING PUMPS FWD W56089
BLANK PAGE December 15, 1971 Revision 1: December 18, 2003 747-28A2033 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 8 of 48 BOEING SERVICE BULLETIN 747-28A2033
ALERT ALERT
BLANK PAGE
December 15, 1971 Revision 1: December 18, 2003 747-28A2033 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 9o f4 8
ALERT ALERT Commercial Airplane Group 747
ALERTALERT Service Bulletin Number: 747-28A2033 Date: December 15, 1971 Revision 1: December 18, 2003 ATA System: 2820 SFB SUBJECT: FUEL - Pump-Motor Housing External Bonding Jumper Installation
THIS BULLETIN IS SENT TO THE OPERATORS OF RECORD OF THE AIRPLANES SHOWN IN PARAGRAPH 1.A., EFFECTIVITY. IF AN AIRPLANE HAS BEEN LEASED OR SOLD, SEND THIS SERVICE BULLETIN TO THE NEW OPERATOR. IF APPLICABLE SPARES HAVE BEEN SOLD, SEND THIS SERVICE BULLETIN TO THE NEW OWNER.
1. PLANNING INFORMATION A. Effectivity
1. Airplanes This service bulletin is for the airplanes shown below. An equivalent change is on subsequent production airplanes. Refer to PRR 75357 for data about this change.
Refer to Service Bulletin Index Document D6-30300 Part 3 for Airplane Variable Number, Line Number, and Serial Number data.
Airplane models:
747-100 747-200B
IDENTIFICATION BY CUSTOMER, CUSTOMER CODE, GROUP AND VARIABLE NUMBER
AERO CONTROLS (AEO) 1 RA722
AIR ATLANTA ICELANDIC (AID) 1 RA534
ALBARAKA (AAB) 1 RB102
ARKIA ISRAELI AIRLINES (ARK) 1 RA253
December 15, 1971 Revision 1: December 18, 2003 747-28A2033 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 10 of 48 BOEING SERVICE BULLETIN 747-28A2033
ALERT ALERT
CORSAIR (COR) 1R A 0 2 3
EVERGREEN INTERNATIONAL A/L (EVR) 1 RA004 RA028 RA631 RA633
EXPORT RESTRICTED AIRPLANES (YWV) 1 RA101–RA103 RA112 RA161–RA163 RA303 RA535
FINOVA (GRB) 1R A 0 1 5 R A 6 5 1
FLEET CAPITAL LEASING (SBC) 1R A 1 0 6
FLIGHTPLAN INTERNATIONAL (FLP) 1R A 0 0 3
GE (GEC) 1R A 0 1 6
GE CAPITAL CORPORATION (GEF) 1 RA005 RA007 RA013 RA027 RA634
JUMBO JET LEASING (JJL) 1 RA532–RA533
KABO AIR (KAB) 1R A 3 0 5 R A 5 6 0
KALITTA AIR (KAC) 1 RA401–RA402 RA524 RA635 RA913
NASA (NAS) 1R A 9 0 8
NORTHWEST AIRLINES (NWA) 1 RA370–RA373
POLAR AIR CARGO (PAO) 1R A 9 1 0 R A 9 1 4
SOUTH AFRICAN AIRWAYS (SAA) 1 RB071–RB073
TRANSJET AIRWAYS (TSX) 1R B 0 0 1
UNITED AIRLINES (UAL) 1 RA903 RA906–RA907
December 15, 1971 Revision 1: December 18, 2003 747-28A2033 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 11 of 48 BOEING SERVICE BULLETIN 747-28A2033
ALERT ALERT
UPS (UPS) 1 RA026 RA029 RA033 RA901–RA902 RA911–RA912 RA915–RA916
IDENTIFICATION BY VARIABLE NUMBER
2. Spares Affected None.
Variable Group RA001–RA034 1 RA101–RA115 1 RA161–RA164 1 RA201–RA203 1 RA216 1 RA245 1 RA251–RA255 1 RA301–RA307 1 RA351–RA360 1 RA369–RA373 1 RA401–RA412 1 RA501–RA502 1 RA521–RA524 1 RA532–RA535 1 RA551–RA552 1 RA559–RA560 1 RA581–RA582 1 RA601–RA602 1 RA631–RA635 1 RA651–RA652 1 RA671–RA676 1 RA701–RA702 1 RA721–RA722 1 RA741–RA743 1 RA761–RA762 1 RA781–RA782 1 RA901–RA916 1 RB001–RB003 1 RB041–RB044 1 RB071–RB073 1 RB101–RB102 1
December 15, 1971 Revision 1: December 18, 2003 747-28A2033 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 12 of 48 BOEING SERVICE BULLETIN 747-28A2033
ALERT ALERT B. Concurrent Requirements None.
C. Reason There are eight boost pumps, four jettison pumps and two override/jettison pumps installed in the fuel system. Pump motors are installed into the pump housing from outside the tanks. All pump housings are directly bolted to aircraft structure and provide tank closure; however, the tank interior, including pump mounting flanges, have a special corrosion protection finish. This finish provides limited electrical bonding and supplementary bonds are required to reduce pump housing to structure voltage during electrical fault conditions. Two supplementary bonding paths are presently provided: one inside the tank from the pump housing to structure and the other from the pump motor case to a ground through the connector.
Based on re-evaluation of this combined current path bonding arrangement, it has been determined that the electrical bonding resistance of these fuel pumps should be reduced. To further ensure mechanical and electrical bonding integrity, it is desirable to install bonding external to the tanks between the pump motor housing and aircraft structure.
This service bulletin revision is the result of SFAR 88. Boeing has conducted a one time engineering evaluation on the airplane fuel tank system design. Based on engineering analysis of the fuel tank system design, Boeing has reached a safety determination for the condition described in this service bulletin. The service bulletin type is changed from Standard to Alert as a result of this safety determination.
The technical content and intent of the service bulletin has not changed, but basic format changes developed since the original issue of the bulletin have been incorporated in this revision.
D. Description Part 1: A larger, easily inspected bonding jumper is installed from each pump housing to airplane structure outside of the fuel tanks.
Part 2 (Optional): A bonding jumper is removed from each pump housing to structure inside the fuel tanks.
Note: After incorporation of Part 1 of this service bulletin, the bonding jumper inside the fuel tank is no longer necessary and at the operator’s option may be removed at any time in accordance with Part 2 of this service bulletin.
Revision 1 - No more work is necessary on airplanes changed as shown in the initial release of this service bulletin.
E. Compliance Boeing recommends that operators incorporate Part 1 of this service bulletin within 5 years after the issue date of this revision.