Boeing Alert Requirements Bulletin 747-38A2146 RB: No revision named, part 1 of 4, text

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Commercial Airplanes 747 Requirements Bulletin ALERT Number: 747-38A2146 RB Original Issue: August 07, 2024 ATA System: 3811 2158 SUBJECT: WATER/WASTE - Storage And Distribution - Water Spray Shrouding Installation 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 © 2024 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 07, 2024 747-38A2146 RB 1 of 155

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Export Controlled ECCN: 9E991 See page 1 for details Original Issue: August 07, 2024 747-38A2146 RB 2 of 155 REQUIREMENTS BULLETIN 747-38A2146

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Table of Contents

1. EFFECTIVITY5

A. Airplanes5

B. Spares Affected8

2. CONCURRENT REQUIREMENTS9

3. COMPLIANCE9

4. APPROVAL14

5. ACCOMPLISHMENT INSTRUCTIONS15

A. General Information15

B. Work Instructions16

FIGURE 6: LEFT SIDE FORWARD CARGO COMPARTMENT - POTABLE WATER SYSTEM - WATER

SUPPLY LINE CONDUIT INSTALLATION [Group 1, 3]26

FIGURE 7: LEFT SIDE FORWARD CARGO COMPARTMENT - POTABLE WATER SYSTEM - WATER

SUPPLY LINE CONDUIT INSTALLATION [Group 2, 4-5, 11]32

FIGURE 8: LEFT SIDE FORWARD CARGO COMPARTMENT, POTABLE WATER SYSTEM - WATER SUPPLY LINE - WATER SPRAY ENVELOPE ASSEMBLY INSTALLATION [Group 2] . . 39 FIGURE 10: LEFT SIDE FORWARD CARGO COMPARTMENT, POTABLE WATER SYSTEM - WATER SUPPLY LINE - WATER SPRAY ENVELOPE ASSEMBLY INSTALLATION [Group 4, 7, 10]

.43

FIGURE 11: LEFT SIDE FORWARD CARGO COMPARTMENT, POTABLE WATER SYSTEM - WATER SUPPLY LINE - WATER SPRAY ENVELOPE ASSEMBLY INSTALLATION [Group 5] . . 48 FIGURE 12: LEFT SIDE FORWARD CARGO COMPARTMENT - POTABLE WATER SYSTEM - WATER

SUPPLY LINE CONDUIT INSTALLATION [Group 6]55

FIGURE 13: LEFT SIDE FORWARD CARGO COMPARTMENT, POTABLE WATER SYSTEM - WATER SUPPLY LINE - WATER SPRAY ENVELOPE ASSEMBLY INSTALLATION [Group 6-7] . 61 FIGURE 14: LEFT SIDE FORWARD CARGO COMPARTMENT - POTABLE WATER SYSTEM - WATER

SUPPLY LINE CONDUIT INSTALLATION [Group 7]66

FIGURE 15: LEFT SIDE FORWARD CARGO COMPARTMENT - POTABLE WATER SYSTEM - WATER

SUPPLY LINE CONDUIT INSTALLATION [Group 8, 10]73

FIGURE 16: LEFT SIDE FORWARD CARGO COMPARTMENT, POTABLE WATER SYSTEM - WATER

SUPPLY LINE - WATER SPRAY ENVELOPE ASSEMBLY AND SLITTED SHIELD

INSTALLATION [Group 8]80

FIGURE 17: LEFT SIDE FORWARD CARGO COMPARTMENT - POTABLE WATER SYSTEM - WATER

SUPPLY LINE CONDUIT INSTALLATION [Group 9]91

FIGURE 18: LEFT SIDE FORWARD CARGO COMPARTMENT, POTABLE WATER SYSTEM - WATER SUPPLY LINE - WATER SPRAY ENVELOPE ASSEMBLY INSTALLATION [Group 9] . . 96 FIGURE 19: LEFT SIDE FORWARD CARGO COMPARTMENT, POTABLE WATER SYSTEM - WATER SUPPLY LINE - WATER SPRAY ENVELOPE ASSEMBLY INSTALLATION [Group 10] . 101 FIGURE 20: FORWARD LOWER LOBE COMPARTMENT, LEFT SIDE - POTABLE WATER SYSTEM -

WATER SPRAY SHIELD INSTALLATION [Group 9-10]108

FIGURE 21: LEFT SIDE FORWARD CARGO COMPARTMENT - EQUIPMENT COOLING SYSTEM, COOLING SUPPLY AIR INLET DUCT - WATER SPRAY DEFLECTOR INSTALLATION [Group

9-10]114

FIGURE 22: LEFT SIDE FORWARD CARGO COMPARTMENT, POTABLE WATER SYSTEM - WATER

SUPPLY LINE - WATER SPRAY ENVELOPE ASSEMBLY AND SLITTED SHIELD

INSTALLATION [Group 11]122

FIGURE 23: LEFT SIDE FORWARD CARGO COMPARTMENT - POTABLE WATER SYSTEM - WATER

SUPPLY LINE CONDUIT INSTALLATION [Group 12]130

Export Controlled ECCN: 9E991 See page 1 for details Original Issue: August 07, 2024 747-38A2146 RB 3 of 155 REQUIREMENTS BULLETIN 747-38A2146

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FIGURE 24: LEFT SIDE FORWARD CARGO COMPARTMENT - POTABLE WATER SYSTEM - WATER

SUPPLY LINE SHROUD INSTALLATION [Group 13]137

FIGURE 25: LEFT SIDE FORWARD CARGO COMPARTMENT - POTABLE WATER SYSTEM - WATER

SUPPLY LINE SHROUD INSTALLATION [Group 14]146

Export Controlled ECCN: 9E991 See page 1 for details Original Issue: August 07, 2024 747-38A2146 RB 4 of 155 REQUIREMENTS BULLETIN 747-38A2146

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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 747-8, 747-8F, 747-400, 747-400F Airplane(s), line number(s) 722, 738, 740, 743, 745, 751, 755, 760, 762, 764, 769, 775, 777, 791-793, 798, 805, 809, 811-812, 816, 819-820, 823, 831, 833, 838-840, 846, 852-853, 861-862, 865-870, 872, 874, 880-881, 883-885, 890, 892, 902, 918, 921-922, 926, 928-929, 931, 939-940, 942-944, 946-947, 950-951, 953-954, 956, 961, 966-968, 973-974, 979-981, 984, 986, 994, 999, 1002, 1004, 1006, 1008-1009, 1016, 1021, 1023-1024, 1026, 1031, 1034, 1036, 1041-1042, 1044, 1051-1054, 1063-1065, 1069, 1072, 1074, 1086-1087, 1089, 1093-1096, 1100-1102, 1107, 1112, 1115, 1120-1121, 1123, 1125-1126, 1131, 1133, 1139, 1142-1143, 1146-1149, 1152-1153, 1155, 1159-1166, 1168-1174, 1176-1177, 1179-1180, 1184-1189, 1191-1192, 1202-1205, 1207-1210, 1213-1214, 1217-1218, 1220-1222, 1224-1225, 1227-1228, 1231, 1234-1237, 1239-1246, 1248, 1250-1265, 1267-1272, 1274-1277, 1279-1295, 1297-1300, 1303-1319, 1321, 1323-1324, 1326-1329, 1331-1369, 1371-1392, 1394-1429, 1431-1445, 1447, 1449-1451, 1453-1462, 1464-1481, 1483-1500, 1502-1504, 1506-1519, 1521-1535, 1537-1539, 1542-1550, 1552-1574 in 14 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 747-400 airplanes with a potable water supply line on the left side of the FWD cargo bay between STA 580 and 650 with no water line fittings between STA 580 and 650.

-1 Export Controlled ECCN: 9E991 See page 1 for details Original Issue: August 07, 2024 747-38A2146 RB 5 of 155

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DESCRIPTIONCONFIGURATIONGROUP 747-400 airplanes with a potable water supply line on the left side of the FWD cargo bay between STA 580 and 650 with a water line fitting but no connected hose at STA 655.

-2 747-400 and 747-400F airplanes with a potable water supply line on the left side of the FWD cargo bay between STA 580 and 650 and possibly with a water line fitting at STA 655 -3 747-400 airplanes with a potable water supply line on the left side of the FWD cargo bay between STA 580 and 650 with a water line fitting and a connected hose at STA 655.

-4 747-400 airplanes with a potable water supply line on the left side of the FWD cargo bay between STA 580 and 650 with a water line fitting and 3 connected hoses at STA 655.

-5 747-400 airplanes with a potable water supply line on the left side of the FWD cargo bay between STA 575 and 650 with a water line fitting but no connected hose at STA 575.

-6 747-400 airplanes with a potable water supply line on the left side of the FWD cargo bay between STA 575 and 650 with water line fittings at STA 575 and 655 and a connected hose at STA 655.

-7 747-400 airplanes with a potable water supply line on the left side of the FWD cargo bay between STA 595 and 650 with water line fittings at STA 595 and 655 with connected hoses at STA 595 and 655.

-8 747-400 airplanes with a potable water supply line on the left side of the FWD cargo bay between STA 595 and 650 with a water line fitting with a connected hose at STA 590 and a heater at STA 595.

-9 747-400 airplanes with a potable water supply line on the left side of the FWD cargo bay between STA 595 and 650 with water line fittings at STA 590 and 655 with connected hoses at STA 590 and 655 and a heater at STA 595.

-10 747-400 airplanes with a potable water supply line on the left side of the FWD cargo bay between STA 580 and 650 with a water line fitting, 3 connected hoses and a heater at STA 655.

-11 747-400 airplanes with a potable water supply line on the left side of the FWD cargo bay between STA 580 and 650 and possibly with a water line fitting at STA 655 -12 747-8 airplanes with a potable water supply line on the left side of the FWD cargo bay between STA 550 and 680.

-13 Export Controlled ECCN: 9E991 See page 1 for details Original Issue: August 07, 2024 747-38A2146 RB 6 of 155 REQUIREMENTS BULLETIN 747-38A2146

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DESCRIPTIONCONFIGURATIONGROUP 747-8F airplanes with a potable water supply line on the left side of the FWD cargo bay between STA 550 and 680.

-14 Airplane Models:

747-400, 747-400F, 747-8, 747-8F GroupVariable Number 13RC001 - RC003 13RC005 - RC009 13RC021 - RC040 13RC051 - RC060 13RC066 - RC072 13RC076 - RC077 14RC501 - RC514 14RC521 - RC528 14RC531 - RC541 14RC546 - RC563 14RC565 - RC566 14RC571 - RC582 14RC608 14RC610 14RC641 - RC644 14RC651 14RC661 14RC672 14RC674 14RC681 - RC696 14RC701 - RC704 1RF001 - RF002 1RF004 1RF006 3RL401 - RL403 3RL412 - RL430 GroupVariable Number 3RL432 - RL436 3RL451 - RL456 3RL461 - RL462 3RL471 - RL481 3RL491 - RL492 3RL501 - RL502 3RL511 - RL516 3RL521 - RL522 3RL531 - RL534 3RL551 3RL561 3RL563 - RL568 3RL571 - RL572 3RL576 - RL577 3RL579 3RL581 - RL586 3RL651 - RL655 3RL671 - RL675 3RL681 - RL684 3RL751 - RL752 1RM001 - RM007 1RM010 - RM013 1RM022 - RM023 1RM026 - RM027 1RM030 10RM036 GroupVariable Number 10RM038 10RM040 4RM041 4RM043 - RM045 4RM051 - RM053 2RM071 4RM082 4RM084 4RM096 1RM117 4RM126 - RM127 3RM128 1RM129 - RM132 4RM136 - RM137 4RM140 5RM146 - RM147 1RM158 7RM166 - RM167 6RM168 6RM172 - RM173 6RM175 - RM177 4RM191 - RM192 1RM232 - RM233 1RM245 - RM246 1RM316 - RM318 2RM333 Export Controlled ECCN: 9E991 See page 1 for details Original Issue: August 07, 2024 747-38A2146 RB 7 of 155 REQUIREMENTS BULLETIN 747-38A2146

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GroupVariable Number 2RM341 1RM351 - RM355 1RM402 - RM403 1RM426 1RM431 1RM441 - RM443 1RM445 9RM801 - RM802 3RM851 - RM859 3RM861 - RM862 3RM871 - RM899 3RM901 - RM906 3RR701 3RR721 - RR724 3RR746 - RR748 3RR851 - RR855 3RR861 - RR862 3RR952 9RT013 3RT021 - RT022 3RT031 - RT033 1RT045 3RT061 3RT071 - RT072 2RT101 - RT103 2RT131 - RT137 3RT161 2RT163 3RT164 2RT165 - RT166 GroupVariable Number 1RT447 4RT496 8RT502 8RT504 3RT506 - RT507 12RT508 3RT509 - RT510 3RT513 8RT515 3RT516 3RT519 3RT524 5RT553 - RT554 5RT562 5RT564 3RT575 - RT576 3RT578 - RT579 1RT581 4RT602 4RT604 4RT606 7RT607 - RT611 7RT616 - RT621 7RT626 - RT627 7RT629 1RT633 - RT634 1RT636 3RT642 4RT647 3RT654 GroupVariable Number 12RT655 3RT656 - RT657 4RT681 - RT682 3RT691 - RT692 1RT693 - RT694 1RT696 4RT701 2RT717 10RT745 10RT747 10RT750 3RT751 - RT752 2RT753 - RT757 12RT782 5RT783 1RT811 1RT813 4RT831 - RT832 3RT837 11RT862 11RT864 2RT877 2RT879 - RT880 4RT948 2RT951 - RT952 4RT966 3RT967 4RU003 - RU006 4RU126 4RU809 B. Spares Affected None.

Export Controlled ECCN: 9E991 See page 1 for details Original Issue: August 07, 2024 747-38A2146 RB 8 of 155 REQUIREMENTS BULLETIN 747-38A2146

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2. CONCURRENT REQUIREMENTS None.

3. COMPLIANCE The Federal Aviation Administration (FAA) will possibly release an Airworthiness Directive related to Requirements Bulletin 747-38A2146 RB. The Airworthiness Directive will make the compliance tasks and times given in Requirements Bulletin 747-38A2146 RB mandatory.

Accomplish the required action(s), based on the applicable condition(s) in Table(s) 1 through 14, 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.

Group 1:

Table 1 - Forward Lower Lobe Compartment Section 42 Left Side - Potable Water System Plumbing

- Water Supply Line Conduit Installation Repeat Interval (Not to Exceed) Boeing Recommended Compliance Time ActionCondition -Within 36 months after the Original Issue date of Requirements Bulletin 747-38A2146 RB.

Install conduits on exposed potable water supply lines between STA 580 and STA 650.

All Airplanes Group 2:

Table 2 - Forward Lower Lobe Compartment Section 42 Left Side - Potable Water System Plumbing

- Water Supply Line Conduit and Envelope Installation Repeat Interval (Not to Exceed) Boeing Recommended Compliance Time ActionCondition -Within 36 months after the Original Issue date of Requirements Bulletin 747-38A2146 RB.

ACTION 1: Install conduits on exposed potable water supply lines between STA 580 and STA

650.

All Airplanes -ACTION 2: Install envelope assemblies over all exposed potable water line fittings and exposed potable water supply lines between STA 650 and STA 660.

Export Controlled ECCN: 9E991 See page 1 for details Original Issue: August 07, 2024 747-38A2146 RB 9 of 155 REQUIREMENTS BULLETIN 747-38A2146

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Group 3:

Table 3 - Forward Lower Lobe Compartment Section 42 Left Side - Potable Water System Plumbing

Install conduits on exposed potable water supply lines between STA 580 and STA 650.

All Airplanes Group 4:

Table 4 - Forward Lower Lobe Compartment Section 42 Left Side - Potable Water System Plumbing

ACTION 1: Install conduits on exposed potable water supply lines between STA 580 and STA

650.

All Airplanes -ACTION 2: Install envelope assemblies over all exposed potable water line fittings and exposed potable water supply lines between STA 650 and STA 660.

Group 5:

Table 5 - Forward Lower Lobe Compartment Section 42 Left Side - Potable Water System Plumbing

ACTION 1: Install conduits on exposed potable water supply lines between STA 580 and STA

650.

All Airplanes -ACTION 2: Install envelope assemblies over all exposed potable water line fittings and exposed potable water supply lines between STA 640 and STA 660.

Export Controlled ECCN: 9E991 See page 1 for details Original Issue: August 07, 2024 747-38A2146 RB 10 of 155 REQUIREMENTS BULLETIN 747-38A2146

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Group 6:

Table 6 - Forward Lower Lobe Compartment Section 42 Left Side - Potable Water System Plumbing

ACTION 1: Install conduits on exposed potable water supply lines between STA 575 and STA

650.

All Airplanes -ACTION 2: Install envelope assemblies over all exposed potable water line fittings and exposed potable water supply lines between STA 570 and STA 580.

Group 7:

Table 7: Forward Lower Lobe Compartment Section 42 Left Side - Potable Water System Plumbing

ACTION 1: Install conduits on exposed potable water supply lines between STA 575 and STA

650.

All Airplanes -ACTION 2: Install envelope assemblies over all exposed potable water line fittings and exposed potable water supply lines between STA 570 and STA 580 and between STA 650 and STA 660.

Export Controlled ECCN: 9E991 See page 1 for details Original Issue: August 07, 2024 747-38A2146 RB 11 of 155 REQUIREMENTS BULLETIN 747-38A2146

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Group 8:

Table 8: Forward Lower Lobe Compartment Section 42 Left Side - Potable Water System Plumbing

- Water Supply Line Conduit, Envelope and Slitted Spray Shield Installation Repeat Interval (Not to Exceed) Boeing Recommended Compliance Time ActionCondition -Within 36 months after the Original Issue date of Requirements Bulletin 747-38A2146 RB.

ACTION 1: Install conduits on exposed potable water supply lines between STA 595 and STA

650.

All Airplanes -ACTION 2: Install envelope assemblies over all exposed potable water line fittings and exposed potable water supply lines between STA 580 and STA 600 and between STA 650 and STA 660.

-ACTION 3: Install a slitted spray shield.

Group 9:

Table 9: Forward Lower Lobe Compartment Section 42 Left Side - Potable Water System Plumbing

- Water Supply Line Conduit, Envelope, Spray Shield and Deflector Shield Installation Repeat Interval (Not to Exceed) Boeing Recommended Compliance Time ActionCondition -Within 36 months after the Original Issue date of Requirements Bulletin 747-38A2146 RB.

ACTION 1: Install conduits on exposed potable water supply lines between STA 595 and STA

650.

All Airplanes -ACTION 2: Install envelope assemblies over all exposed potable water line fittings and exposed potable water supply lines between STA 580 and STA 600.

-ACTION 3: Install spray shield.

-ACTION 4: Install a 2- piece deflector shield around the ECS air inlet STA 610.

Export Controlled ECCN: 9E991 See page 1 for details Original Issue: August 07, 2024 747-38A2146 RB 12 of 155 REQUIREMENTS BULLETIN 747-38A2146

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