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Commercial Airplanes 777 Requirements Bulletin ALERT Number: 777-27A0125 RB Original Issue: February 03, 2023 ATA System: 2721 SUBJECT: FLIGHT CONTROLS - Rudder Control System - Gust Suppression Sensor Transorb Module Replacement 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 © 2023 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Unpublished Work.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: February 03, 2023 777-27A0125 RB 1 of 30
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Table of Contents
1. EFFECTIVITY5
A. Airplanes5
B. Spares Affected8
2. CONCURRENT REQUIREMENTS8
3. COMPLIANCE8
4. APPROVAL10
5. ACCOMPLISHMENT INSTRUCTIONS11
A. General Information11
B. Work Instructions12
FIGURE 1: UPPER GUST SUPPRESSION SENSOR TRANSORB MODULE REMOVAL16
FIGURE 2: UPPER GUST SUPPRESSION SENSOR TRANSORB MODULE INSTALLATION19
FIGURE 3: LOWER GUST SUPPRESSION SENSOR TRANSORB MODULE REMOVAL22
FIGURE 4: LOWER GUST SUPPRESSION SENSOR TRANSORB MODULE INSTALLATION25
FIGURE 5: PART MARKING28
APPENDIX A: ACCEPTANCE TEST PROCEDURE29
Export Controlled ECCN: 9E991 Copyright © Unpublished Work - See page 1 for details.
Original Issue: February 03, 2023 777-27A0125 RB 3 of 30 REQUIREMENTS BULLETIN 777-27A0125
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Export Controlled ECCN: 9E991 Copyright © Unpublished Work - See page 1 for details.
Original Issue: February 03, 2023 777-27A0125 RB 4 of 30 REQUIREMENTS BULLETIN 777-27A0125
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Commercial Airplanes 777 Requirements Bulletin ALERT Number: 777-27A0125 RB Original Issue: February 03, 2023 ATA System: 2721 SUBJECT: FLIGHT CONTROLS - Rudder Control System - Gust Suppression Sensor Transorb Module Replacement
THIS DOCUMENT 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 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, 1724-1726 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.
DESCRIPTIONCONFIGURATIONGROUP 777-200, 777-200LR, 777-300, 777-300ER and 777F airplanes.- 1 Airplane Models:
777-200, 777-200LR, 777-300, 777-300ER, 777F GroupVariable Number 1WA001 - WA017 1WA076 - WA080 GroupVariable Number 1WA086 - WA093 1WA101 - WA104 GroupVariable Number 1WA116 - WA119 1WA131 - WA137 Export Controlled ECCN: 9E991 Copyright © Unpublished Work - See page 1 for details.
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GroupVariable Number 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 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 GroupVariable Number 1WB481 - WB484 1WB501 - WB512 1WB531 - WB537 1WB551 - WB554 1WB591 - WB597 1WB601 - WB606 1WB611 - WB622 1WB631 - WB638 1WB646 - WB649 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 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 Export Controlled ECCN: 9E991 Copyright © Unpublished Work - See page 1 for details.
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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 GroupVariable Number 1WE511 - WE516 1WE526 - WE528 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 GroupVariable Number 1WF001 - WF004 1WF016 - WF029 1WF031 - WF043 1WF046 - WF077 1WF081 - WF088 1WF096 - WF101 1WF106 - WF109 1WF111 - WF124 1WF131 - WF144 1WF146 - WF147 1WF151 - WF152 1WF156 - WF173 1WF176 - WF184 1WF191 1WF201 1WF206 - WF217 1WF221 - WF228 1WF231 - WF248 1WF256 - WF258 1WF261 - WF262 1WF266 - WF288 1WF296 1WF301 - WF306 1WF311 - WF314 1WF321 1WF326 - WF328 1WF336 - WF342 1WF366 - WF367 1WF371 - WF372 -- -- B. Spares Affected Export Controlled ECCN: 9E991 Copyright © Unpublished Work - See page 1 for details.
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Examine your spares supply for the parts or components identified below. If any parts or components are found, refer to APPENDIX A for the recommended action.
NamePart Number TRANSORB CONNECTOR ADAPTER ASSEMBLYCLPT-12SP-06 TRANSORB CONNECTOR ADAPTER ASSEMBLYCLPT-12SP-07 TRANSORB CONNECTOR ADAPTER ASSEMBLYCLPT-12SP-67
2. CONCURRENT REQUIREMENTS None.
3. COMPLIANCE Federal Aviation Administration (FAA) Airworthiness Directive AD 2022-15-06 is related to this bulletin. The effective date of AD 2022-15-06 is August 18, 2022.
The Federal Aviation Administration (FAA) will possibly release an Airworthiness Directive related to Requirements Bulletin 777-27A0125 RB. The Airworthiness Directive will make the compliance tasks and times given in Requirements Bulletin 777-27A0125 RB mandatory.
Accomplish the required action(s), based on the applicable condition(s) in Table 1, 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.
Export Controlled ECCN: 9E991 Copyright © Unpublished Work - See page 1 for details.
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Table1: Gust Suppression Sensor Transorb Module - Replacement.
Repeat Interval (Not to Exceed) Boeing Recommended Compliance Time ActionCondition -Within 24 months after the Original Issue date of Requirements Bulletin 777-27A0125 RB or within 24 months after the date of issuance of the original standard certificate of airworthiness or the original export certificate of airworthiness,whichever occurs later.
OPTION 1: Do Acceptance Test Procedure (ATP) of the upper and lower Gust Suppression Sensor Transorb (GSST) modules to measure overall length and electrical resistance.
All Airplanes -OPTION 2: Replace upper and lower GSST with new or serviceable GSST(a) -CONDITION 1 OPTION 1 (ACTION 1): Part mark affected GSST.
CONDITION 1: ANY GSST
MODULE WITH AN
OVERALL LENGTH
EQUAL TO OR LESS THAN 2.490 INCHES AND
ELECTRICAL RESIS-
TANCE IS LESS THAN OR EQUAL TO 0.30 MIL-
LIOHMS AS A RESULT OF OPTION 1 ATP -CONDITION 1 OPTION 1 (ACTION 2): Install affected Part marked GSST -CONDITION 1 OPTION 2: Replace affected GSST with new or serviceable GSST(a) -Replace affected GSST with new or serviceable GSST(a) CONDITION 2: ANY GSST
MODULE WITH AN
OVERALL LENGTH MORE THAN 2.490 INCHES AND
ANY MEASURED ELEC-
TRICAL RESISTANCE
VALUE AS A RESULT OF OPTION 1 ATP -Replace affected GSST with new or serviceable GSST(a) CONDITION 3: ANY GSST
MODULE WITH AN
OVERALL LENGTH
EQUAL TO OR LESS THAN 2.490 INCHES AND
ELECTRICAL RESIS-
TANCE IS MORE THAN
0.30 MILLIOHMS AS A RESULT OF OPTION 1 ATP
(a) A serviceable GSST module is defined as GSST module that has an overall length of less than or equal to 2.490 inches and an electrical resistance of less than or equal to 0.30 milliohms and that has been part marked with part number CLPT-12SP-67-3, CLPT-12SP-06-3, or CLPT-12SP-
07-3.
Export Controlled ECCN: 9E991 Copyright © Unpublished Work - See page 1 for details.
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4. APPROVAL This Requirements Bulletin was examined by the Federal Aviation Administration (FAA). The changes specified in this document comply with the applicable regulations and are FAA approved, as well as European Union Aviation Safety Agency (EASA)/Joint Aviation Authorities (JAA) approved for all EASA/JAA approved airplanes listed in this Requirements Bulletin effectivity. This document and its approval were based on the airplane in its original Boeing delivery configuration or as modified by other Boeing changes.
If an airplane has a non-Boeing modification or repair that affects a component or system also affected by this Requirements Bulletin, the operator is responsible for obtaining appropriate regulatory agency approval before incorporating this Requirements Bulletin.
In addition, the Manager of the FAA Seattle ACO Branch approves accomplishment of the changes defined in this bulletin as an alternative method of compliance to accomplishing the actions required by paragraph
(g) of AD 2022-15-06. Note that airplanes that have not been modified by this bulletin prior to the compliance times of paragraphs (g)(1) and (g)(2) (whichever occurs later) of AD 2022-15-06 must accomplish the actions required by of paragraph (g) of the AD within the AD compliance times. All provisions of AD 2022-15-06 that are not specifically referenced in the above statement remain fully applicable and must be complied with accordingly.
Export Controlled ECCN: 9E991 Copyright © Unpublished Work - See page 1 for details.
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5. ACCOMPLISHMENT INSTRUCTIONS A. GENERAL INFORMATION NOTE: 1. This is an Enhanced Required for Compliance document. There will be a separate Service Bulletin (SB) and a separate Requirements Bulletin (RB). If an RB is mandated by an Airworthiness Directive (AD), then all applicable requirements specified in the RB must be done. For the related SB, some locations are marked RC Start and RC End to identify the requirements that are restated from the RB. For the related SB, the areas between RC Start and RC End, including sub-steps and any figures identified between RC Start and RC End, must be done to comply with the AD.
Therefore, an Alternative Method of Compliance (AMOC) is required for any deviations to steps between RC Start and RC End, including substeps and identified figures.
For the related SB, the steps not between RC Start and RC End may be deviated from using accepted methods in accordance with the operator's maintenance or inspection program without obtaining approval of an AMOC; this is provided that the steps between RC Start and RC End, including sub-steps and identified figures, can still be done as specified, and the airplane can be put back in an airworthy condition.
Figures not required for compliance are omitted from the RB.
2. 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.
3. The compliance times for the actions in WORK INSTRUCTIONS are in Compliance.
4. Unless shown differently, these dimensions and tolerances are used:
– Linear dimensions are in inches – Tolerance on linear dimensions, other than rivet and bolt edge margins, is plus or minus 0.03 inch – Tolerance on rivet and bolt edge margin is plus or minus 0.05 inch – Angular tolerance is plus or minus 2 degrees – Hole dimensions for standard solid rivets and fasteners are in Structural Repair Manual (SRM) Chapter 51 – Torque Values:
— Values for structural fasteners are given in 777 Structural Repair Manual, Chapter 51.
— Values for airframe maintenance tasks are included in Chapter 20 of 777 Aircraft Maintenance Manual (AMM).
— Values for electrical maintenance tasks are included in Chapter 20 of Standard Wiring Practices Manual (SWPM).
— Values for engine maintenance tasks are included in Chapter 70 of 777 Aircraft Maintenance Manual (AMM).
— Non-standard torque values for maintenance tasks are included in the applicable installation step.
Export Controlled ECCN: 9E991 Copyright © Unpublished Work - See page 1 for details.
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5. 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.
6. 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.
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. Use the approved fastener, process and material substitutions in accordance with SRM Chapter 51.
9. 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.
10. The instructions in Work Instructions and the figures can include operation of tools or test equipment. Boeing Engineering Tool Drawings, the Illustrated Tool and Equipment Manual, and the Special Tool and Ground Handling Drawing Index contain data on versions of the tools or test equipment that you can use. It is permitted to use replaced tools. It is not permitted to use superseded tools.
11. Refer to the SWPM 20-10-11 and SWPM 20-10-12 for the wire installation procedures, and SWPM 20-10-19 for the wire separation requirements, as accepted procedures.
12. The necessary conditions for selection of clamp type and size are included in SWPM 20-10-12. If any wire bundle support clamp specified in this service bulletin does not make a correct fit on the wire bundle, refer to SWPM 20-10-12 as an accepted procedure to select a clamp that fits correctly.
B. WORK INSTRUCTIONS Actions Required For Compliance
1. Requirements Export Controlled ECCN: 9E991 Copyright © Unpublished Work - See page 1 for details.
Original Issue: February 03, 2023 777-27A0125 RB 12 of 30 REQUIREMENTS BULLETIN 777-27A0125
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