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Commercial Airplanes 777 Requirements Bulletin ALERT Number: 777-28A0097 RB Original Issue: August 14, 2025 ATA System: 2822 SUBJECT: FUEL - Engine Fuel Feed System - Engine Fuel Feed Tube Bonding Hardware Inspection and Electrical Bonding Resistance Measurement EXPORT CONTROLLED - This technology or software is subject to the U.S. Export Administration Regulations (EAR), (15 C.F.R. Parts 730-774). No authorization from the U.S. Department of Commerce is required for export, re-export, in-country transfer, or access EXCEPT to country group E:1 or E:2 countries/persons per Supp.1 to Part 740 of the EAR.
9E991ECCN:
Copyright © 2025 The Boeing Company 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: August 14, 2025 777-28A0097 RB 1 of 73
6.0
Export Controlled ECCN: 9E991 See page 1 for details Original Issue: August 14, 2025 777-28A0097 RB 2 of 73 REQUIREMENTS BULLETIN 777-28A0097
ALERTALERT
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Table of Contents
1. EFFECTIVITY5
A. Airplanes5
B. Spares Affected8
2. CONCURRENT REQUIREMENTS8
3. COMPLIANCE8
4. APPROVAL24
5. ACCOMPLISHMENT INSTRUCTIONS25
A. General Information25
B. Work Instructions26
FIGURE 1: LEFT WING - FORWARD ENGINE FUEL FEED TUBE TO WING STRUCTURE - BONDING
JUMPERS, SADDLE CLAMPS, AND TUBE CLAMP INSPECTION AND ELECTRICAL BONDING
RESISTANCE MEASUREMENT47
FIGURE 2: LEFT WING - FORWARD ENGINE FUEL FEED TUBE TO WING STRUCTURE - BONDING
JUMPER AND TUBE CLAMP REMOVAL, CLEAN AND INSTALLATION51
FIGURE 3: LEFT WING - FORWARD ENGINE FUEL FEED TUBE TO WING STRUCTURE - SADDLE
CLAMP REMOVAL AND INSTALLATION AND ELECTRICAL BONDING RESISTANCE
MEASUREMENT55
FIGURE 4: RIGHT WING - FORWARD ENGINE FUEL FEED TUBE TO WING STRUCTURE - BONDING
JUMPERS, SADDLE CLAMPS AND TUBE CLAMP INSPECTION AND ELECTRICAL BONDING
RESISTANCE MEASUREMENT58
FIGURE 5: RIGHT WING - FORWARD ENGINE FUEL FEED TUBE TO WING STRUCTURE - BONDING
JUMPER AND TUBE CLAMP REMOVAL, CLEAN AND INSTALLATION62
FIGURE 6: RIGHT WING - FORWARD ENGINE FUEL FEED TUBE TO WING STRUCTURE - SADDLE
CLAMP REMOVAL AND INSTALLATION AND ELECTRICAL BONDING RESISTANCE
MEASUREMENT66
APPENDIX B: ACCEPTABLE BONDING JUMPER INSTALLATIONS69
APPENDIX C: MAXIMUM ELECTRICAL BONDING RESISTANCES70
Export Controlled ECCN: 9E991 See page 1 for details Original Issue: August 14, 2025 777-28A0097 RB 3 of 73 REQUIREMENTS BULLETIN 777-28A0097
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Export Controlled ECCN: 9E991 See page 1 for details Original Issue: August 14, 2025 777-28A0097 RB 4 of 73 REQUIREMENTS BULLETIN 777-28A0097
ALERTALERT
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Commercial Airplanes 777 Requirements Bulletin ALERT Number: 777-28A0097 RB Original Issue: August 14, 2025 ATA System: 2822 SUBJECT: FUEL - Engine Fuel Feed System - Engine Fuel Feed Tube Bonding Hardware Inspection and Electrical Bonding Resistance Measurement
THIS DOCUMENT IS SENT TO THE OPERATORS OF RECORD OF THE AIRPLANES SHOWN IN EFFECTIVITY. IF AN AIRPLANE HAS BEEN LEASED OR SOLD, SEND THIS DOCUMENT TO THE NEW OPERATOR. IF APPLICABLE SPARES HAVE BEEN SOLD, SEND THIS DOCUMENT TO THE NEW OWNER.
THIS IS AN ENHANCED REQUIRED FOR COMPLIANCE DOCUMENT. THE BOEING PROCESSES USED
TO CREATE THE SERVICE BULLETIN (SB) AND THE REQUIREMENTS BULLETIN (RB) ENSURE THAT THE INFORMATION BETWEEN "RC START" AND "RC END" IN THE SB ARE IDENTICAL TO THE INFORMATION IN THE SAME SECTIONS (COMPLIANCE, WORK INSTRUCTIONS…) OF THE RB WHICH THE SB REFERS TO AS THE RELATED DOCUMENT.
1. Effectivity A. Airplanes This bulletin is applicable to 777-200, 777-200LR, 777-300, 777-300ER, 777F Airplane(s), line number(s) 1-1566, 1568-1573, 1575-1580, 1582-1586, 1588-1604, 1606-1610, 1612-1614, 1616-1619, 1621-1623, 1625-1628, 1630-1632, 1634-1637, 1639-1641, 1643-1646, 1648-1650, 1652-1655, 1657-1658, 1660-1667, 1669, 1671, 1673, 1675-1676, 1678-1679, 1681, 1683-1684, 1686-1687, 1689-1715, 1717-1722, 1724-1727, 1729-1736, 1738-1739, 1741-1745, 1747-1780, 1782-1784, 1786-1787, 1789-1793, 1795-1797, 1799-1800, 1802, 1804-1805, 1807, 1809-1810, 1812, 1814-1815, 1817, 1819-1820, 1822, 1824-1825, 1827, 1829-1830, 1832, 1834-1835, 1837-1838, 1840-99999 in 1 Group(s). Where the effectivity is presented with hyphens between line numbers, the airplane applicability means "through" and "inclusive", e.g. line numbers 1-9 means line numbers 1 through 9 inclusive.
The Variable Numbers and Group Information for the applicable airplanes is given below.
NOTE: The Variable Number table below includes affected airplanes available as of the issue date of this bulletin. Affected airplane Variable Numbers added to MyBoeingFleet.com after the issue date of this bulletin will be shown using the Maintenance Performance Toolbox EFFECTIVITY search function result.
Export Controlled ECCN: 9E991 See page 1 for details Original Issue: August 14, 2025 777-28A0097 RB 5 of 73
DESCRIPTIONCONFIGURATIONGROUP All 777-200,-200LR,-300,-300ER and 777F Airplanes.-1 Airplanes equipped with GE engines.1 Airplanes equipped with Pratt and Whitney or Rolls-Royce engines.2 Airplane Models:
777-200, 777-200LR, 777-300, 777-300ER, 777F GroupVariable Number 1WA001 - WA017 1WA076 - WA080 1WA086 - WA093 1WA101 - WA104 1WA116 - WA119 1WA131 - WA137 1WA171 - WA175 1WA196 - WA198 1WA206 - WA212 1WA221 - WA223 1WA231 - WA232 1WA241 - WA250 1WA261 - WA266 1WA281 - WA283 1WA301 - WA304 1WB001 - WB021 1WB031 - WB046 1WB051 - WB088 1WB101 - WB106 1WB121 - WB125 1WB131 - WB148 1WB151 - WB155 1WB161 - WB177 1WB181 - WB194 GroupVariable Number 1WB201 - WB215 1WB231 - WB247 1WB271 - WB273 1WB276 - WB286 1WB291 - WB302 1WB306 - WB307 1WB311 - WB337 1WB341 - WB342 1WB366 - WB368 1WB371 - WB388 1WB406 1WB411 - WB413 1WB416 - WB439 1WB446 - WB453 1WB476 1WB481 - WB484 1WB501 - WB512 1WB531 - WB537 1WB551 - WB554 1WB591 - WB597 1WB601 - WB606 1WB611 - WB622 1WB631 - WB638 1WB646 - WB649 GroupVariable Number 1WC051 - WC073 1WC101 - WC104 1WC111 - WC120 1WC221 - WC224 1WC241 - WC243 1WC281 - WC290 1WC301 - WC308 1WC361 - WC364 1WC371 - WC374 1WC381 - WC395 1WC441 1WC446 - WC449 1WC456 - WC459 1WC486 - WC493 1WC506 - WC508 1WC521 - WC522 1WC531 - WC536 1WC546 - WC548 1WC556 1WC566 - WC567 1WC571 - WC574 1WC581 1WC586 - WC587 1WC591 - WC595 Export Controlled ECCN: 9E991 See page 1 for details Original Issue: August 14, 2025 777-28A0097 RB 6 of 73 REQUIREMENTS BULLETIN 777-28A0097
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GroupVariable Number 1WD001 - WD002 1WD011 - WD018 1WD031 - WD036 1WD046 - WD055 1WD066 - WD075 1WD081 - WD089 1WD091 1WD096 1WD101 - WD106 1WD111 - WD112 1WD116 - WD117 1WD121 - WD123 1WD156 1WD501 - WD513 1WD521 - WD541 1WD546 - WD554 1WD561 - WD573 1WD581 - WD599 1WD606 - WD609 1WD621 - WD632 1WD651 - WD665 1WD671 - WD677 1WD691 - WD709 1WD741 - WD752 1WD761 - WD771 1WD786 - WD788 1WD796 - WD837 1WD846 - WD867 1WD871 - WD918 1WD921 - WD957 1WD966 - WD970 1WD981 - WD982 1WD986 - WD987 GroupVariable Number 1WD991 - WD996 1WE001 - WE007 1WE011 - WE012 1WE021 - WE026 1WE031 - WE040 1WE051 - WE057 1WE071 - WE078 1WE081 - WE084 1WE091 - WE095 1WE126 - WE178 1WE186 - WE219 1WE226 - WE231 1WE236 - WE253 1WE261 - WE267 1WE271 - WE278 1WE291 - WE298 1WE301 - WE320 1WE331 - WE356 1WE366 - WE368 1WE376 - WE377 1WE381 1WE386 - WE387 1WE391 - WE392 1WE396 - WE411 1WE416 - WE420 1WE426 - WE431 1WE436 - WE446 1WE451 - WE484 1WE486 - WE493 1WE495 - WE499 1WE501 - WE504 1WE511 - WE516 1WE526 - WE528 GroupVariable Number 1WE536 - WE549 1WE556 - WE573 1WE576 - WE587 1WE591 1WE601 - WE605 1WE626 - WE627 1WE631 1WE641 - WE642 1WE646 - WE647 1WE651 - WE661 1WE666 - WE677 1WE681 - WE689 1WE701 - WE705 1WE711 - WE712 1WE731 - WE732 1WE736 - WE740 1WE746 - WE772 1WE776 - WE786 1WE791 - WE792 1WE796 - WE798 1WE801 - WE806 1WE811 - WE812 1WE826 - WE828 1WE831 - WE835 1WE851 - WE853 1WE856 - WE857 1WE861 - WE863 1WE866 - WE868 1WE871 1WF001 - WF004 1WF016 - WF043 1WF046 - WF077 1WF081 - WF088 Export Controlled ECCN: 9E991 See page 1 for details Original Issue: August 14, 2025 777-28A0097 RB 7 of 73 REQUIREMENTS BULLETIN 777-28A0097
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GroupVariable Number 1WF096 - WF101 1WF106 - WF109 1WF111 - WF124 1WF131 - WF144 1WF146 - WF147 1WF151 - WF152 1WF156 - WF173 1WF176 - WF184 1WF191 1WF201 1WF206 - WF217 1WF221 - WF229 1WF231 - WF251 GroupVariable Number 1WF256 - WF262 1WF266 - WF288 1WF296 - WF298 1WF301 - WF323 1WF326 - WF330 1WF336 - WF350 1WF356 - WF359 1WF366 - WF377 1WF381 - WF390 1WF396 - WF399 1WF401 - WF404 1WF411 - WF412 1WF416 - WF417 GroupVariable Number 1WF421 1WF426 - WF427 1WF431 - WF435 1WF441 - WF442 1WF446 - WF449 1WF456 1WF461 - WF462 1WF471 - WF472 1WF476 - WF477 1WF482 - WF483 1WF486 - WF487 1WF491 - WF492 -- B. Spares Affected None.
2. CONCURRENT REQUIREMENTS None.
3. COMPLIANCE Group 1, Configuration 1:
Federal Aviation Administration (FAA) Airworthiness Directive AD 2024-19-14 is related to this bulletin. The effective date of AD 2024-19-14 is October 17, 2024.
Group 1, Configuration 2:
The Federal Aviation Administration (FAA) will possibly release an Airworthiness Directive related to Requirements Bulletin 777-28A0097 RB. The Airworthiness Directive will make the compliance tasks and times given in Requirements Bulletin 777-28A0097 RB mandatory.
Accomplish the required actions, based on the applicable conditions in Tables 1 through 4, in accordance with Accomplishment Instructions.
When more than one OPTION is given for a CONDITION, do only one of the OPTION numbers. When more than one ACTION is given for a CONDITION or an OPTION, do all of the ACTION numbers for that CONDITION or OPTION.
More than one CONDITION may apply.
Export Controlled ECCN: 9E991 See page 1 for details Original Issue: August 14, 2025 777-28A0097 RB 8 of 73 REQUIREMENTS BULLETIN 777-28A0097
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Group 1, Configuration 1:
Table 1: Left Wing Engine Fuel Feed Tube to Wing Structure Bonding Jumpers, Saddle Clamps, Tube Clamp Inspection and Electrical Bonding Resistance Measurement Repeat Interval (Not to Exceed) Boeing Recommended Compliance Time (Whichever Occurs Later) ActionCondition -Within 90 days after the Original Issue date of Requirements Bulletin 777-28A0097 RB, or within 1 year after accomplishing the most recent inspection specified in Boeing Multi Operator Message MOM-MOM-24- 0463-01B, dated September 4, 2024, or within 1 year after the date of issuance of the original standard certificate of airworthiness or the original export certificate of airworthiness.
Do a Detailed Inspection (DET) of the engine fuel feed tube to wing structure bonding jumpers, saddle clamps, and tube clamp for any damage, a DET for any loose bonding jumper lugs or tube clamp, and a DET for any missing bonding jumpers or tube clamp, and do electrical bonding resistance measurement between the wing structure and engine fuel feed tube.
(a)(b)(d) All Airplanes.
-Before further flight.CONDITION 1 (ACTION 1):
Replace any damaged and missing bonding jumpers and tube clamps. Re-install any undamaged loose bonding jumper lugs and tube clamps. Make sure the electrical bonding measurement between the wing structure and engine fuel feed tube is less than 2.5 milliohms.
(c) CONDITION 1: ANY DAM-
AGE FOUND TO BONDING
JUMPER(S) OR TUBE
CLAMP, OR ANY LOOSE
BONDING JUMPER LUGS
OR TUBE CLAMP FOUND,
OR ANY MISSING BOND-
ING JUMPER OR TUBE
CLAMP, BUT NO DAMAGE
FOUND TO SADDLE CLAMPS.
1 year-CONDITION 1 (ACTION 2):
Repeat DET of the engine fuel feed tube to wing structure bonding jumpers, saddle clamps, and tube clamp for any damage, a DET for any loose bonding jumper lugs or tube clamp, and a DET for any missing bonding jumpers or tube clamp, and do electrical bonding resistance measurement between the wing structure and engine fuel feed tube. (a)(b)(d) Export Controlled ECCN: 9E991 See page 1 for details Original Issue: August 14, 2025 777-28A0097 RB 9 of 73 REQUIREMENTS BULLETIN 777-28A0097
ALERTALERT
Group 1, Configuration 1:
Table 1: Left Wing Engine Fuel Feed Tube to Wing Structure Bonding Jumpers, Saddle Clamps, Tube Clamp Inspection and Electrical Bonding Resistance Measurement Repeat Interval (Not to Exceed) Boeing Recommended Compliance Time (Whichever Occurs Later) ActionCondition -Before further flight.Replace saddle clamp(s) and do an electrical bonding resistance measurement between the wing structure and engine fuel feed tube.
CONDITION 2: ANY DAM-
AGE FOUND TO SADDLE
CLAMP(S) BUT NOT TO
BONDING JUMPERS OR
TUBE CLAMP, AND NO
LOOSE BONDING JUMPER
LUGS OR TUBE CLAMP
FOUND, AND NO MISSING
BONDING JUMPERS OR TUBE CLAMP.
-At the times specified in CONDITION 4.
Comply with the actions in CONDITION 4.
CONDITION 2.1: ELECTRI-
CAL BONDING RESIS-
TANCE MEASUREMENT IS MORE THAN 4.0 MIL- LIOHMS.
-At the times specified in CONDITION 5.
Comply with the action in CON- DITION 5.
CONDITION 2.2: ELECTRI-
CAL BONDING RESIS-
TANCE MEASUREMENT IS
4.0 MILLIOHMS OR LESS.
-Before further flight.CONDITION 3 (ACTION 1):
Replace any damaged saddle clamps, bonding jumpers and tube clamps. Make sure the electrical bonding measurement between the wing structure and engine fuel feed tube is less than 2.5 milliohms. (c) CONDITION 3: ANY DAM-
AGE FOUND TO BONDING
JUMPER(S) OR TUBE
CLAMP, OR ANY LOOSE
BONDING JUMPER LUGS
OR TUBE CLAMP FOUND,
OR ANY MISSING BOND-
ING JUMPER OR TUBE
CLAMP, AND ANY DAM-
AGE FOUND TO SADDLE CLAMP(S).
1 year-CONDITION 3 (ACTION 2):
Repeat DET of the engine fuel feed tube to wing structure bonding jumpers, saddle clamps, and tube clamp for any damage, a DET for any loose bonding jumper lugs or tube clamp, and a DET for any missing bonding jumpers or tube clamp, and do electrical bonding resistance measurement between the wing structure and engine fuel feed tube. (a)(b)(d) Export Controlled ECCN: 9E991 See page 1 for details Original Issue: August 14, 2025 777-28A0097 RB 10 of 73 REQUIREMENTS BULLETIN 777-28A0097
ALERTALERT
Group 1, Configuration 1:
Table 1: Left Wing Engine Fuel Feed Tube to Wing Structure Bonding Jumpers, Saddle Clamps, Tube Clamp Inspection and Electrical Bonding Resistance Measurement Repeat Interval (Not to Exceed) Boeing Recommended Compliance Time (Whichever Occurs Later) ActionCondition -Before further flight.CONDITION 4 (ACTION 1):
Remove the bonding jumpers and related hardware, clean bond surfaces, install bonding jumpers and removed hardware, and make sure the electrical bonding measurement between the wing structure and engine fuel feed tube is 2.5 milliohms or less.
CONDITION 4: NO DAM-
AGE FOUND TO BONDING
JUMPERS OR TUBE
CLAMP OR SADDLE
CLAMPS, NO LOOSE
BONDING JUMPER LUGS
OR TUBE CLAMP FOUND,
AND NO MISSING BOND-
ING JUMPERS OR TUBE
CLAMP BUT ELECTRICAL
BONDING RESISTANCE
MEASUREMENT BE-
TWEEN THE WING
STRUCTURE AND ENGINE
FUEL FEED TUBE IS MORE THAN 4.0 MIL- LIOHMS.
1 year-CONDITION 4 (ACTION 2):
Repeat DET of the engine fuel feed tube to wing structure bonding jumpers, saddle clamps, and tube clamp for any damage, a DET for any loose bonding jumper lugs or tube clamp, and a DET for any missing bonding jumpers or tube clamp, and do electrical bonding resistance measurement between the wing structure and engine fuel feed tube. (a)(b)(d) 1 year-Repeat DET of the engine fuel feed tube to wing structure bonding jumpers, saddle clamps, and tube clamp for any damage, a DET for any loose bonding jumper lugs or tube clamp, and a DET for any missing bonding jumpers or tube clamp, and do electrical bonding resistance measurement between the wing structure and engine fuel feed tube. (a)(b)(d) CONDITION 5: NO DAM-
AGE FOUND TO BONDING
JUMPERS OR TUBE
CLAMP OR SADDLE
CLAMPS, NO LOOSE
BONDING JUMPER LUGS
OR TUBE CLAMP FOUND,
NO MISSING BONDING
JUMPERS OR TUBE
CLAMP, AND ELECTRICAL
BONDING RESISTANCE
MEASUREMENT BE-
TWEEN THE WING
STRUCTURE AND ENGINE FUEL FEED TUBE IS 4.0 MILLIOHMS OR LESS.
(a) Bonding jumper damage is defined as one or more broken strands in the wire braid. Loose is defined as component rotation when trying to rotate with light finger pressure.
Export Controlled ECCN: 9E991 See page 1 for details Original Issue: August 14, 2025 777-28A0097 RB 11 of 73 REQUIREMENTS BULLETIN 777-28A0097
ALERTALERT
Group 1, Configuration 1:
Table 1: Left Wing Engine Fuel Feed Tube to Wing Structure Bonding Jumpers, Saddle Clamps, Tube Clamp Inspection and Electrical Bonding Resistance Measurement Repeat Interval (Not to Exceed) Boeing Recommended Compliance Time (Whichever Occurs Later) ActionCondition
(b) Saddle clamp damage is defined as the rubber part of the clamp being split, cracked or broken or any contact between the saddle clamps' metal components with the fuel tube. Only the visible surfaces of the saddle clamp need to be inspected. The clamps do not need to be disassembled for this inspection.
(c) It is only necessary to replace damaged bonding jumpers, tube clamps, and saddle clamps.
(d) Tube clamp damage is defined as tube clamp being cracked, broken or screw hole elongated.
Group 1, Configuration 1:
Table 2: Right Wing Engine Fuel Feed Tube to Wing Structure Bonding Jumpers, Saddle Clamps, Tube Clamp Inspection and Electrical Bonding Resistance Measurement Repeat Interval (Not to Exceed) Boeing Recommended Compliance Time (Whichever Occurs Later) ActionCondition -Within 90 days after the Original Issue date of Requirements Bulletin 777-28A0097 RB, or within 1 year after accomplishing the most recent inspection specified in Boeing Multi Operator Message MOM-MOM-24- 0463-01B, dated September 4, 2024, or within 1 year after the date of issuance of the original standard certificate of airworthiness or the original export certificate of airworthiness.
Do a Detailed Inspection (DET) of the engine fuel feed tube to wing structure bonding jumpers, saddle clamps, and tube clamp for any damage, a DET for any loose bonding jumper lugs or tube clamp, and a DET for any missing bonding jumpers or tube clamp, and do electrical bonding resistance measurement between the wing structure and engine fuel feed tube.
(a)(b)(d) All Airplanes.
Export Controlled ECCN: 9E991 See page 1 for details Original Issue: August 14, 2025 777-28A0097 RB 12 of 73 REQUIREMENTS BULLETIN 777-28A0097