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Commercial Airplanes 747 Requirements Bulletin ALERT Number: 747-23A2628 RB Original Issue: April 18, 2025 ATA System: 2325 SUBJECT: COMMUNICATIONS - Satellite Communications (SATCOM) System - SATCOM High Gain Antenna Adapter Plate Inspection and Change 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: April 18, 2025 747-23A2628 RB 1 of 36
2.0
Export Controlled ECCN: 9E991 See page 1 for details Original Issue: April 18, 2025 747-23A2628 RB 2 of 36 REQUIREMENTS BULLETIN 747-23A2628
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Table of Contents
1. EFFECTIVITY5
A. Airplanes5
B. Spares Affected9
2. CONCURRENT REQUIREMENTS9
3. COMPLIANCE9
4. APPROVAL19
5. ACCOMPLISHMENT INSTRUCTIONS21
A. General Information21
B. Work Instructions22
FIGURE 1: SATELLITE COMMUNICATIONS (SATCOM) HIGH GAIN ANTENNA - ADAPTER PLATE -
DETAILED INSPECTION [Group 1, Configuration 2, 4]35
FIGURE 2: SATELLITE COMMUNICATIONS (SATCOM) HIGH GAIN ANTENNA - ADAPTER PLATE -
DETAILED INSPECTION [Group 1, Configuration 3-4]36
Export Controlled ECCN: 9E991 See page 1 for details Original Issue: April 18, 2025 747-23A2628 RB 3 of 36 REQUIREMENTS BULLETIN 747-23A2628
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Export Controlled ECCN: 9E991 See page 1 for details Original Issue: April 18, 2025 747-23A2628 RB 4 of 36 REQUIREMENTS BULLETIN 747-23A2628
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Commercial Airplanes 747 Requirements Bulletin ALERT Number: 747-23A2628 RB Original Issue: April 18, 2025 ATA System: 2325 SUBJECT: COMMUNICATIONS - Satellite Communications (SATCOM) System - SATCOM High Gain Antenna Adapter Plate Inspection and Change
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 747-100, 747-100B, 747-100B SUD, 747-200B, 747-200C, 747-200F, 747-300, 747-400, 747-400D, 747-400F, 747SP, 747SR Airplane(s), line number(s) 1-1419 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.
Export Controlled ECCN: 9E991 See page 1 for details Original Issue: April 18, 2025 747-23A2628 RB 5 of 36
DESCRIPTIONCONFIGURATIONGROUP 747-100/-100B/-100B SUD/-200B/-200C/-200F/-300/-400/-400D/ -400F/SP/SR airplanes.
-1 Airplanes not equipped with SATCOM High Gain Antenna Adapter Plate(s) part number 100-602074-000 or 100-602549-000.
1 Airplanes equipped with SATCOM High Gain Antenna Adapter Plate(s) part number 100-602074-000 and not equipped with part number 100-602549-000.
2 Airplanes equipped with SATCOM High Gain Antenna Adapter Plate(s) part number 100-602549-000 and not equipped with part number 100-602074-000.
3 Airplanes equipped with SATCOM High Gain Antenna Adapter Plate part number 100-602074-000 and part number 100-602549-000.
4 Airplane Models:
747-100, 747-100B, 747-100B SUD, 747-200B, 747-200C, 747-200F, 747-300, 747-400, 747-400D, 747-400F, 747SP, 747SR GroupVariable Number 1RA001 - RA034 1RA101 - RA115 1RA161 - RA164 1RA201 - RA203 1RA216 - RA217 1RA245 - RA246 1RA251 - RA266 1RA301 - RA318 1RA351 - RA360 1RA369 - RA373 1RA401 - RA418 1RA501 - RA502 1RA521 - RA528 1RA532 - RA548 1RA551 - RA552 1RA559 - RA561 GroupVariable Number 1RA581 - RA582 1RA585 1RA601 - RA602 1RA631 - RA635 1RA651 - RA652 1RA671 - RA677 1RA701 - RA702 1RA721 - RA731 1RA741 - RA745 1RA749 - RA750 1RA761 - RA762 1RA781 - RA784 1RA901 - RA916 1RB001 - RB016 1RB041 - RB044 1RB071 - RB075 GroupVariable Number 1RB101 - RB102 1RB411 - RB413 1RB421 1RB601 - RB607 1RB681 - RB697 1RB711 1RB721 - RB723 1RB741 - RB748 1RD001 - RD004 1RD021 - RD022 1RD041 - RD059 1RD071 - RD072 1RD081 - RD083 1RD091 - RD092 1RD101 - RD104 1RD121 - RD127 Export Controlled ECCN: 9E991 See page 1 for details Original Issue: April 18, 2025 747-23A2628 RB 6 of 36 REQUIREMENTS BULLETIN 747-23A2628
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GroupVariable Number 1RD131 - RD144 1RD166 - RD167 1RD171 - RD172 1RD181 - RD183 1RD201 - RD204 1RD221 - RD227 1RD231 - RD235 1RD241 - RD243 1RD251 - RD262 1RD271 - RD272 1RD291 - RD292 1RD301 - RD302 1RD311 1RD351 - RD358 1RD361 - RD366 1RD381 - RD383 1RD411 - RD414 1RD421 - RD426 1RD431 - RD435 1RD441 - RD442 1RD451 - RD456 1RD461 1RD471 - RD475 1RD513 - RD519 1RD531 - RD533 1RD551 1RD561 1RD571 1RD581 - RD583 1RD591 - RD593 1RD601 - RD607 1RD621 - RD623 1RD641 - RD649 GroupVariable Number 1RD651 - RD659 1RD661 1RD671 1RD681 - RD682 1RD691 - RD692 1RD701 - RD702 1RD721 - RD722 1RD741 - RD742 1RD751 - RD755 1RD761 1RD771 - RD775 1RD781 - RD783 1RD791 - RD792 1RE001 1RF001 - RF006 1RG001 - RG009 1RG091 1RG095 1RG101 - RG104 1RG121 - RG126 1RG141 - RG142 1RG161 - RG164 1RG171 - RG174 1RG191 - RG193 1RG211 - RG213 1RG221 - RG222 1RH101 - RH102 1RH111 - RH112 1RH121 - RH122 1RJ131 - RJ133 1RJ151 - RJ152 1RJ301 - RJ303 1RJ321 - RJ322 GroupVariable Number 1RJ331 - RJ333 1RL401 - RL403 1RL411 - RL436 1RL451 - RL456 1RL461 - RL462 1RL471 - RL481 1RL491 - RL492 1RL501 - RL502 1RL511 - RL516 1RL521 - RL522 1RL531 - RL534 1RL551 1RL561 - RL568 1RL571 - RL572 1RL576 - RL577 1RL579 1RL581 - RL586 1RL651 - RL655 1RL671 - RL675 1RL681 - RL684 1RL751 - RL752 1RM001 - RM007 1RM010 - RM013 1RM021 - RM024 1RM026 - RM030 1RM036 - RM045 1RM051 - RM053 1RM071 1RM081 - RM084 1RM091 1RM096 - RM097 1RM116 - RM117 1RM126 - RM132 Export Controlled ECCN: 9E991 See page 1 for details Original Issue: April 18, 2025 747-23A2628 RB 7 of 36 REQUIREMENTS BULLETIN 747-23A2628
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GroupVariable Number 1RM136 - RM147 1RM156 - RM158 1RM166 - RM177 1RM191 - RM192 1RM231 - RM233 1RM241 - RM246 1RM261 - RM264 1RM316 - RM318 1RM331 - RM333 1RM341 1RM351 - RM355 1RM366 - RM367 1RM401 - RM403 1RM426 1RM431 1RM441 - RM443 1RM445 1RM801 - RM803 1RM811 - RM813 1RM851 - RM859 1RM861 - RM863 1RM871 - RM899 1RM901 - RM906 1RM911 1RR001 - RR005 1RR021 - RR025 1RR031 1RR201 - RR206 1RR221 - RR226 1RR261 - RR267 1RR301 - RR310 1RR331 - RR332 1RR336 GroupVariable Number 1RR341 - RR345 1RR361 - RR362 1RR421 - RR422 1RR431 - RR432 1RR441 - RR442 1RR451 1RR501 - RR504 1RR521 - RR522 1RR526 1RR531 1RR551 - RR556 1RR561 1RR566 1RR701 1RR721 - RR724 1RR746 - RR748 1RR851 - RR856 1RR861 - RR862 1RR951 - RR952 1RS001 - RS002 1RS201 1RS211 - RS212 1RS221 - RS222 1RS231 - RS241 1RS251 - RS259 1RS263 1RS265 - RS268 1RS271 - RS276 1RS291 - RS292 1RS301 - RS306 1RS311 - RS320 1RS331 - RS333 1RS341 - RS342 GroupVariable Number 1RS699 1RS701 - RS703 1RS711 - RS713 1RS721 - RS722 1RS731 - RS732 1RS741 - RS743 1RS751 - RS752 1RS761 - RS762 1RS771 1RS781 - RS782 1RS786 1RT001 - RT014 1RT021 - RT022 1RT031 - RT035 1RT041 - RT047 1RT061 1RT071 - RT075 1RT101 - RT103 1RT121 1RT131 - RT137 1RT151 - RT152 1RT161 - RT168 1RT401 - RT412 1RT431 - RT447 1RT451 - RT469 1RT471 - RT499 1RT501 - RT535 1RT551 - RT568 1RT571 - RT591 1RT601 - RT657 1RT671 - RT673 1RT681 - RT682 1RT691 - RT699 Export Controlled ECCN: 9E991 See page 1 for details Original Issue: April 18, 2025 747-23A2628 RB 8 of 36 REQUIREMENTS BULLETIN 747-23A2628
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GroupVariable Number 1RT701 - RT704 1RT711 - RT717 1RT741 - RT757 1RT776 - RT777 1RT781 - RT784 1RT801 - RT803 1RT811 - RT814 1RT831 - RT837 GroupVariable Number 1RT861 - RT864 1RT876 - RT880 1RT931 - RT932 1RT945 - RT949 1RT951 - RT955 1RT966 - RT967 1RU001 - RU006 1RU016 - RU017 GroupVariable Number 1RU031 - RU032 1RU051 - RU052 1RU059 - RU062 1RU081 - RU083 1RU101 - RU102 1RU121 - RU132 1RU801 - RU809 1RU831 - RU841 B. Spares Affected None.
2. CONCURRENT REQUIREMENTS None.
3. COMPLIANCE The Federal Aviation Administration (FAA) will possibly release an Airworthiness Directive related to Requirements Bulletin 747-23A2628 RB. The Airworthiness Directive will make the compliance tasks and times given in Requirements Bulletin 747-23A2628 RB mandatory.
Accomplish the required action(s), based on the applicable condition(s) in Table(s) 1, 2, 3, and 4 in accordance with Accomplishment Instructions.
The Conditions, Actions and Compliance times shown apply to each adapter plate location independently.
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.
Group 1, Configuration 1:
No work is necessary.
Any airplane that installs SATCOM High Gain Antenna Adapter Plate part number 100-602074-000 and does not install part number 100-602549-000 after the Original Issue date of Requirements Bulletin 747-23A2628 RB, must comply with the requirements specified in Group 1, Configuration 2.
Any airplane that installs SATCOM High Gain Antenna Adapter Plate part number 100-602549-000 and does not install part number 100-602074-000 after the Original Issue date of Requirements Bulletin 747-23A2628 RB, must comply with the requirements specified in Group 1, Configuration 3.
Any airplane that installs SATCOM High Gain Antenna Adapter Plate part number 100-602074-000 and part number 100-602549-000 after the Original Issue date of Requirements Bulletin 747-23A2628 RB, must comply with the requirements specified in Group 1, Configuration 4.
Export Controlled ECCN: 9E991 See page 1 for details Original Issue: April 18, 2025 747-23A2628 RB 9 of 36 REQUIREMENTS BULLETIN 747-23A2628
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Group 1, Configuration 2, 4:
Table 1: Satellite Communications (SATCOM) High Gain Antenna Adapter Plate Inspection Repeat Interval (Not to Exceed) Boeing Recommended Compliance Time ActionCondition -Within 12 months after the Original Issue date of Requirements Bulletin 747-23A2628 RB.
At the location(s) where part number 100- 602074-000 is installed, do a Detailed Inspection (DET) of the SATCOM High Gain Antenna Adapter Plate for corrosion.
Airplanes with SAT- COM High Gain Antenna Adapter Plate(s) with part number 100- 602074-000 that have been installed for 20 years or more as of the Original Issue date of Requirements Bulletin 747-23A2628 RB, or the installation date cannot be determined.
48 months.-At the location(s) where part number 100- 602074-000 is installed, repeat the DET of the SATCOM High Gain Antenna Adapter Plate for corrosion. (d) CONDITION 1: NO
CORROSION FOUND -Before further flight.OPTION 1 (ACTION 1): Repair the SAT- COM High Gain Antenna Adapter Plate.
CONDITION 2: ANY
CORROSION FOUND
THAT IS LESS THAN OR EQUAL TO 0.005 INCH IN DEPTH (a) 48 months.-OPTION 1 (ACTION 2): At the location(s) where part number 100-602074-000 is installed, repeat the DET of the SATCOM High Gain Antenna Adapter Plate for corrosion. (d) -Before further flight.OPTION 2 (ACTION 1): Replace the SATCOM High Gain Antenna Adapter Plate with a serviceable SATCOM High Gain Antenna Adapter Plate. (b)(c) 48 months.-OPTION 2 (ACTION 2): At the location(s) where part number 100-602074-000 is installed, repeat the DET of the SATCOM High Gain Antenna Adapter Plate for corrosion. (d) -Before further flight.OPTION 3 (ACTION 1): Replace the SATCOM High Gain Antenna Adapter Plate with a new SATCOM High Gain Antenna Adapter Plate. (c) 96 months.-OPTION 3 (ACTION 2): At the location(s) where part number 100-602074-000 is installed, repeat the DET of the SATCOM High Gain Antenna Adapter Plate for corrosion. (d) Export Controlled ECCN: 9E991 See page 1 for details Original Issue: April 18, 2025 747-23A2628 RB 10 of 36 REQUIREMENTS BULLETIN 747-23A2628
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Group 1, Configuration 2, 4:
Table 1: Satellite Communications (SATCOM) High Gain Antenna Adapter Plate Inspection Repeat Interval (Not to Exceed) Boeing Recommended Compliance Time ActionCondition -Before further flight.OPTION 1 (ACTION 1): Replace the SATCOM High Gain Antenna Adapter Plate with a serviceable SATCOM High Gain Antenna Adapter Plate. (b)(c) CONDITION 3: ANY
CORROSION FOUND
THAT IS GREATER THAN 0.005 INCH IN DEPTH (a) 48 months.-OPTION 1 (ACTION 2): At the location(s) where part number 100-602074-000 is installed, repeat the DET of the SATCOM High Gain Antenna Adapter Plate for corrosion. (d) -Before further flight.OPTION 2 (ACTION 1): Replace the SATCOM High Gain Antenna Adapter Plate with a new SATCOM High Gain Antenna Adapter Plate. (c) 96 months.-OPTION 2 (ACTION 2): At the location(s) where part number 100-602074-000 is installed, repeat the DET of the SATCOM High Gain Antenna Adapter Plate for corrosion. (d)
(a) Adapter plate corrosion damage limitations can be found in CMC Electronics CMM 23-15-06, Original Issue, dated April 16, 2024, or later revisions.
(b) A serviceable SATCOM adapter plate is one that has been inspected for corrosion and applicable oncondition corrective actions has been done in accordance with Requirements Bulletin 747-23A2628 RB.
(c) Any airplane that installs SATCOM High Gain Antenna Adapter Plate part number 100-602549-000 and does not install part number 100-602074-000 after the Original Issue date of Requirements Bulletin 747- 23A2628 RB, must comply with the requirements specified in Group 1, Configuration 3.
(d) The removal of SATCOM High Gain Antenna Adapter Plate part number 100-602074-000 after the Original Issue date of Requirements Bulletin 747-23A2628 RB terminates the repeat DET inspection at the location(s) where part number 100-602074-000 was removed.
Export Controlled ECCN: 9E991 See page 1 for details Original Issue: April 18, 2025 747-23A2628 RB 11 of 36 REQUIREMENTS BULLETIN 747-23A2628
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Group 1, Configuration 2, 4:
Table 2: Satellite Communications (SATCOM) High Gain Antenna Adapter Plate Inspection Repeat Interval (Not to Exceed) Boeing Recommended Compliance Time (Whichever Occurs Later) ActionCondition -Within 96 months after installation of a new SATCOM High Gain Antenna Adapter Plate.
Within 24 months after the Original Issue date of Requirements Bulletin 747- 23A2628 RB.
At the location(s) where part number 100-602074-000 is installed, do a Detailed Inspection (DET) of the SATCOM High Gain Antenna Adapter Plate for corrosion.
Airplanes with SAT- COM High Gain Antenna Adapter Plate(s) with part number 100- 602074-000 that have been installed for less than 20 years as of the Original Issue date of Requirements Bulletin 747-23A2628 RB.
48 months.-At the location(s) where part number 100-602074-000 is installed, repeat the DET of the SATCOM High Gain Antenna Adapter Plate for corrosion. (d) CONDITION 4: NO
CORROSION FOUND Export Controlled ECCN: 9E991 See page 1 for details Original Issue: April 18, 2025 747-23A2628 RB 12 of 36 REQUIREMENTS BULLETIN 747-23A2628