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Commercial Airplanes 747 Service Bulletin Number: 747-28-2344 Original Issue: October 12, 2018 ATA System: 2841 SUBJECT: FUEL - Fuel Quantity Indicating System - Center Wing Tank Fuel Quantity Indicating System Wire Change Export of this technology is controlled under the United States Export Administration Regulations (EAR) (15 CFR 300-774). 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.
9E991ECCN:
BOEING PROPRIETARY, CONFIDENTIAL AND/OR TRADE SECRET Copyright © 2018 Boeing.
Unpublished Work. All Rights Reserved.
Treatment of this document and its content is governed by contract with Boeing. Rights to use this document are licensed on a per aircraft basis and such rights may not be transferable. For more information, contact The Boeing Company.
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, KC-46, KDC-10, MD-10, MD-11, MD-80, MD-88, MD-90, P-8, Poseidon and Boeing liveries 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.
Original Issue: October 12, 2018 747-28-2344 1 of 128
7.0
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: October 12, 2018 747-28-2344 2 of 128 BOEING SERVICE BULLETIN 747-28-2344
BLANK PAGE
Table of Contents
Summary5
1. PLANNING INFORMATION9
A. Effectivity9
1. Airplanes9
2. Spares Affected12
B. Concurrent Requirements12
C. Reason12
D. Description13
E. Compliance14
F. Approval17
G. Manpower17
H. Weight and Balance Changes21
I. Electrical Load Data21
J. References21
1. Existing Data:21
2. Data Supplied with this Service Bulletin:22
3. Installation Drawings Used in the Preparation of this Service Bulletin:22
K. Publications Affected22
L. Interchangeability and Intermixability of Parts23
M. Software Accomplishment Summary23
2. MATERIAL INFORMATION25
A. Material - Price and Availability25
B. Industry Support Information26
C. Parts Necessary for Each Airplane26
1. Kits/Parts26
2. Parts and Materials Supplied by the Operator33
3. Parts Modified and Reidentified33
4. Parts Removed and Not Replaced34
D. Parts Necessary to Change Spares34
E. Special Tooling - Price and Availability34
F. Special Tooling Necessary to do this Service Bulletin34
3. ACCOMPLISHMENT INSTRUCTIONS35
A. GENERAL INFORMATION35
B. WORK INSTRUCTIONS37
FIGURE 1: LEFT SIDE - FQIS WIRE X1008 (S283U007-518) INSPECTION [Group 1, 6]53
FIGURE 2: LEFT SIDE - FQIS WIRE X1008 (S283U007-518 OR S283U007-318) INSPECTION [Group
2-5, 7-8]64
FIGURE 3: LEFT SIDE - STATION 920 THROUGH STA 980 - BRACKET ASSY AND STANDOFF
INSTALLATION75
FIGURE 4: LEFT SIDE - E6 FQPU TO PRESSURE SEAL STATION 1278 - FQIS WIRE X1008
(S283U007-518) WIRE ROUTING CHANGE [Group 1, 3, 5-8]84
FIGURE 5: LEFT SIDE - E6 FQPU TO PRESSURE SEAL STATION 1278 - FQIS WIRE X1008
(S283U007-318) WIRE ROUTING CHANGE [Group 2, 4]99
FIGURE 6: LEFT WHEEL WELL AND CENTER WING TANK - SINGLE POINT SENSOR (SPS) WIRES
X1012 (S283U007-312) AND X1011 (S283U007-502) REMOVAL [Group 2-3, 7]114
FIGURE 7: E6 FQPU TO PRESSURE SEAL STATION 1278 - WIRING CHANGE [Group 1, 3, 5-8] . 122 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
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FIGURE 8: E6 FQPU TO PRESSURE SEAL STATION 1278 - WIRING CHANGE [Group 2, 4] . . . 124 FIGURE 9: LEFT WHEEL WELL AND CENTER WING TANK WIRING - REMOVAL [Group 2-3, 7] . 126
APPENDIX A: INPUT SURVEY128
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: October 12, 2018 747-28-2344 4 of 128 BOEING SERVICE BULLETIN 747-28-2344
Commercial Airplanes 747 Service Bulletin SummaryNumber: 747-28-2344Original Issue: October 12, 2018 ATA System: 2841 SUBJECT: FUEL - Fuel Quantity Indicating System - Center Wing Tank Fuel Quantity Indicating System Wire Change
CONCURRENT REQUIREMENTS The Airworthiness Limitations (AWL) listed below must be added to the airplane's maintenance program before or at the same time as this service bulletin.
DescriptionAWLDocumentCompany Fuel Quantity Indicating System (FQIS) - Out Of Tank Wiring Lightning Shield to Ground Termination 28-AWL-03747-400 Maintenance Planning Data (MPD) Document, Section 9, Airworthiness Limitations (AWLs) and Certification Maintenance Requirements (CMRs), D621U400-9, Revision August 2016 or later revision that has been approved by the FAA Oversight Office (Boeing Aviation Safety Oversight Office (BASOO)) Boeing Wire Separation Requirements for New Wiring Installed in Proximity to Wiring That Goes Into the Fuel Tanks 28-AWL-08 Fuel Quantity Indicating System (FQIS), Single Point Sensor (SPS), and Auxiliary Fuel Tank (Cell) Electronic Fuel Level Indication (EFLI) - In-Tank Hardware Installation - Separation From Structure (FQIS Tank Units, Compensators, SPS, and Auxiliary Fuel Tank (Cell) EFLI Probes (If Installed) 28-AWL-14 Visible Means of Identification for Fuel Quantity Indicating System (FQIS) Wiring that Goes into the Center Wing Tank 28-AWL-38
BACKGROUND The changes given in this service bulletin will improve the wire routing for Fuel Quantity Indicating System (FQIS) wire outside the fuel tank on 747-400F and 747-400 Boeing Converted Freighters (BCF) aircraft. The FQIS wiring from the Fuel Quantity Processor Unit (FQPU) to the pressure seal area station 1278 must be separated from other airplane system wiring. If this service bulletin is not done, an undetected failure of the FQIS components inside the center wing tank (CWT), in combination with an electrical hot short to FQIS wiring outside the tank, can cause ignition source of the fuel tank which could result in smoke and/or fire in the fuel tank.
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: October 12, 2018 747-28-2344 5 of 128
A Federal Aviation Administration (FAA) review of the Boeing Special Federal Aviation Regulation No. 88 (SFAR88) System Safety Assessment identified a non-safety fuel tank condition on delivered and modified freighter airplanes which do not have Nitrogen Generating System (NGS) installed to reduce flammability in the CWT. An investigation identified that the FQIS wiring was routed together with other airplane system wires, which did not meet the 747 System Separation Requirement. The entire length of the FQIS wire from the FQPU to the pressure seal area will be sleeved, to address areas where increased separation is not possible.
This service bulletin gives instructions to do a General Visual Inspection for any damage to FQIS wire. Install a bracket and standoff, then install pink sleeving over the FQIS wire from the FQPU to the pressure seal area to identify it as an FQIS wire bundle with separation limitation. The change will meet the wire separation requirements for FQIS wire from the other airplane system wires.
This service bulletin is the result of the safety assessments conducted by Boeing under a SFAR88, Fuel Tank System Fault Tolerance Evaluation Requirements.
Boeing Service Related Problem (SRP) 747-SRP-28-0149 is related to this service bulletin.
Boeing Fleet Team Digest (FTD) 747 FTD 28-13004 is related to this service bulletin.
Sufficient data is not available to Boeing from operators to establish reliability and maintenance rates to support cost benefit analysis. Operators should examine their own data to evaluate the impact to their fleets.
This table is provided to operators for planning purposes only. Refer to the applicable sections for more information.
ReferenceAffectedPlanning Data Paragraph 1.A.2., Spares AffectedNoSpares Affected Paragraph 1.E., Compliance and Paragraph
1.F., Approval YesAD Related Paragraph 1.H., Weight and Balance ChangesYesWeight and Balance Change Paragraph 1.I., Electrical Load DataNoElectrical Load Changed Paragraph 1.K., Publications AffectedYesPublications Affected Paragraph 1.K., Publications AffectedNoAirplane Flight Operations Affected (Flight Crew Operations Manual and/or FAA Approved Airplane Flight Manual) Paragraph 2.C.1., Kits/PartsYesKits/Parts Required Paragraph 2.C.2., Parts and Materials Supplied by the Operator YesOperator Supplied Parts/Material Paragraph 2.F., Special Tooling Necessary to do this Service Bulletin NoSpecial Tooling Required ACTION (PRR 85901-132RS) Group 1, 5:
Open access. Do a General Visual Inspection to find any damage to the FQIS wire bundle. Replace an existing bracket and install a standoff. Change the FQIS wire bundle. Do the Fuel Quantity Indicating System Operational Test. Close access.
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: October 12, 2018 747-28-2344 6 of 128 BOEING SERVICE BULLETIN 747-28-2344
Group 2, 7:
Open access. Do a General Visual Inspection to find any damage to the FQIS wire bundle. Replace an existing bracket and install a standoff. Change the FQIS wire bundle. Remove the Single Point Sensor (SPS) wires X1012 (S283U007-312) from the wheel well spar connector and X1011 (S283U007-502) from the CWT. Do the Fuel Quantity Indicating System Operational Test. Close access.
Group 3:
Open access. Do a General Visual Inspection to find any damage to the FQIS wire bundle. Replace an existing bracket and install a standoff. Change the FQIS wire bundle. Remove the SPS wires X1012 (S283U007-312) from the wheel well spar connector, and X1011 (S283U007-502) from CWT. Do the Fuel Quantity Indicating System Operational Test. Close access.
Group 4, 6, 8:
Open access. Do a General Visual Inspection to find any damage to the FQIS wire bundle. Replace an existing bracket and install a standoff. Change the FQIS wire bundle. Do the Fuel Quantity Indicating System Operational Test. Close access.
EFFECTIVITY 747-400, 747-400F Airplanes. Refer to Paragraph 1.A.1., Airplanes, for the list of affected airplanes.
COMPLIANCE The Federal Aviation Administration (FAA) will possibly release an Airworthiness Directive (AD) related to this service bulletin. The Airworthiness Directive will make the compliance tasks and times given in this service bulletin mandatory.
Refer to Paragraph 1.E., Compliance.
INDUSTRY SUPPORT INFORMATION Boeing warranty remedies are not available for the configuration changes given in this service bulletin.
MANPOWER Refer to Paragraph 1.G., Manpower.
MATERIAL INFORMATION Boeing Supplied Kits/Parts.
Refer to Paragraph 2.A., Material - Price and Availability.
Operators are encouraged to complete the survey provided in APPENDIX A of this service bulletin to help Boeing predict the quantity and timing of the Boeing Supplied Kits/Parts.
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
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BOEING SERVICE BULLETIN 747-28-2344 STA 1000
CENTER WING TANK FUEL
QUANTITY INDICATING
SYSTEM (FQIS) WIRE BUNDLE
CHANGE AND INSPECTION SIA 780 E6 FUEL QUANTITY 2386176
PROCESSOR
UNIT(FQPU) Original Issue: October 12, 2018 PROPRIETARY - Copyright © Unpublished Export Controlled ECCN: 9E991 - BOEING 747-28-2344 Work - See page 1 for detalls. 8 of 128
Commercial Airplanes 747 Service Bulletin Number: 747-28-2344 Original Issue: October 12, 2018 ATA System: 2841 SUBJECT: FUEL - Fuel Quantity Indicating System - Center Wing Tank Fuel Quantity Indicating System Wire Change
1. PLANNING INFORMATION A. Effectivity
1. Airplanes Refer to Service Bulletin Index D6-30300 Part 3 for Airplane Variable Number, Line Number, and Serial Number data.
This service bulletin is applicable to 747-400BCF and 747-400F Airplanes in eight (8) Groups. The Variable Numbers and Group Information for the applicable airplanes is given below. An equivalent change is on subsequent production airplanes. Refer to PRR 85901-132RS for data about this change.
NOTE: The 747-400BCF may also be known as 747-400SF. Where 747-400BCF is noted in this SB, it is also applicable to the 747-400SF that were modified by Boeing Service Bulletin.
DESCRIPTIONCONFIGURATIONGROUP 747-400F airplanes, FQIS wire bundle change that use Top Kit 015U2132-1.
-1 747-400 BCF airplanes with the single point sensor installed. FQIS wire bundle change that use Top Kit 015U2132-2.
-2 747-400 BCF airplanes with the single point sensor installed. FQIS wire bundle change that use Top Kit 015U2132-3.
-3 747-400 BCF airplanes, FQIS wire bundle change that use Top Kit 015U2132-4.
-4 747-400 BCF airplanes, FQIS wire bundle change that use Top Kit 015U2132-1.
-5 747-400F airplanes, FQIS wire bundle change that use Top Kit 015U2132-1.
-6 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: October 12, 2018 747-28-2344 9 of 128
DESCRIPTIONCONFIGURATIONGROUP 747-400 BCF airplanes with the single point sensor installed. FQIS wire bundle change that use Top Kit 015U2132-3.
-7 747-400 BCF airplanes, FQIS wire bundle change that use Top Kit 015U2132-1.
-8 Airplane Models:
747-400, 747-400F GroupVariable Number 1RL401 - RL403 1RL411 - RL436 1RL451 - RL456 1RL461 - RL462 1RL471 - RL481 1RL491 - RL492 1RL501 - RL502 1RL511 - RL516 1RL521 - RL522 1RL531 - RL534 1RL551 1RL561 1RL563 - RL568 1RL571 - RL572 1RL576 - RL577 1RL579 1RL581 - RL586 1RL651 - RL655 1RL671 - RL675 1RL681 - RL684 1RL751 - RL752 5RM128 1RM851 - RM859 1RM861 - RM862 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
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GroupVariable Number 1RM871 - RM899 1RM901 - RM906 1RM911 6RR701 1RR721 - RR724 1RR746 - RR748 1RR851 - RR856 1RR861 - RR862 1RR951 - RR952 2RT021 - RT022 4RT031 - RT033 2RT061 7RT071 - RT072 3RT161 3RT164 7RT456 2RT501 2RT506 7RT507 - RT510 7RT513 7RT516 7RT518 - RT519 3RT520 3RT524 3RT528 3RT530 2RT572 - RT573 7RT574 - RT576 7RT578 - RT579 2RT642 8RT654 - RT657 2RT691 - RT692 7RT751 - RT752 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: October 12, 2018 747-28-2344 11 of 128 BOEING SERVICE BULLETIN 747-28-2344
GroupVariable Number 7RT781 - RT782 3RT837 5RT967
2. Spares Affected None.
B. Concurrent Requirements The Airworthiness Limitations (AWL) listed below must be added to the airplane's maintenance program before or at the same time as this service bulletin.
DescriptionAWLDocumentCompany Fuel Quantity Indicating System (FQIS) - Out Of Tank Wiring Lightning Shield to Ground Termination 28-AWL-03747-400 Maintenance Planning Data (MPD) Document, Section 9, Airworthiness Limitations (AWLs) and Certification Maintenance Requirements (CMRs), D621U400-9, Revision August 2016 or later revision that has been approved by the FAA Oversight Office (Boeing Aviation Safety Oversight Office (BASOO)) Boeing Wire Separation Requirements for New Wiring Installed in Proximity to Wiring That Goes Into the Fuel Tanks 28-AWL-08 Fuel Quantity Indicating System (FQIS), Single Point Sensor (SPS), and Auxiliary Fuel Tank (Cell) Electronic Fuel Level Indication (EFLI) - In-Tank Hardware Installation - Separation From Structure (FQIS Tank Units, Compensators, SPS, and Auxiliary Fuel Tank (Cell) EFLI Probes (If Installed) 28-AWL-14 Visible Means of Identification for Fuel Quantity Indicating System (FQIS) Wiring that Goes into the Center Wing Tank 28-AWL-38 C. Reason The changes given in this service bulletin will improve the wire routing for Fuel Quantity Indicating System (FQIS) wire outside the fuel tank on 747-400F and 747-400 Boeing Converted Freighters (BCF) aircraft. The FQIS wiring from the Fuel Quantity Processor Unit (FQPU) to the pressure seal area station 1278 must be separated from other airplane system wiring. If this service bulletin is not done, an undetected failure of the FQIS components inside the center wing tank (CWT), in combination with an electrical hot short to FQIS wiring outside the tank, can cause ignition source of the fuel tank which could result in smoke and/or fire in the fuel tank.
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: October 12, 2018 747-28-2344 12 of 128 BOEING SERVICE BULLETIN 747-28-2344