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Commercial Airplanes 747 Service Bulletin ALERT Number: 747-25A3640 Original Issue: January 08, 2014 ATA System: 2551 SUBJECT: EQUIPMENT/FURNISHINGS - Electrical/Electronic Equipment Centers - Main Equipment Center Drip Shield Repair 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:

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: January 08, 2014 747-25A3640 1 of 26

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Original Issue: January 08, 2014 747-25A3640 2 of 26 BOEING SERVICE BULLETIN 747-25A3640

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Table of Contents

Summary5

1. PLANNING INFORMATION9

A. Effectivity9

1. Airplanes9

2. Spares Affected ........................................ 1 1 B. Concurrent Requirements ...................................... 1 1 C. Reason ................................................ 1 2 D. Description .............................................. 1 2 E. Compliance .............................................. 1 3 F. Approval ............................................... 1 3 G. Manpower .............................................. 1 3 H. Weight and Balance Changes .................................... 1 3 I. Electrical Load Data ......................................... 1 4 J. References .............................................. 1 4

1. Existing Data: ......................................... 1 4

2. Data Supplied with this Service Bulletin: ........................... 1 4

3. Installation Drawings Used in the Preparation of this Service Bulletin: ........... 1 4 K. Publications Affected ........................................ 1 4 L. Interchangeability and Intermixability of Parts ........................... 1 4 M. Software Accomplishment Summary ................................ 1 5

2. MATERIAL INFORMATION ........................................ 1 7 A. Material - Price and Availability ................................... 1 7 B. Industry Support Information .................................... 1 7 C. Parts Necessary for Each Airplane ................................. 1 7

1. Kits/Parts ............................................ 1 7

2. Parts and Materials Supplied by the Operator ........................ 1 7

3. Parts Modified and Reidentified ................................ 1 7

4. Parts Removed and Not Replaced .............................. 1 7 D. Parts Necessary to Change Spares ................................. 1 7 E. Special Tooling - Price and Availability ............................... 1 8 F. Special Tooling Necessary to do this Service Bulletin ....................... 1 8

3. ACCOMPLISHMENT INSTRUCTIONS .................................. 1 9 A. GENERAL INFORMATION ..................................... 1 9 B. WORK INSTRUCTIONS ....................................... 2 0 FIGURE 1: MEC DRIP SHIELD FIBERGLASS REINFORCING OVERCOAT INSTALLATION ..... 2 1 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.

Original Issue: January 08, 2014 747-25A3640 3 of 26 BOEING SERVICE BULLETIN 747-25A3640

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Original Issue: January 08, 2014 747-25A3640 4 of 26 BOEING SERVICE BULLETIN 747-25A3640

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Commercial Airplanes 747 Service Bulletin ALERT SummaryNumber: 747-25A3640Original Issue: January 08, 2014 ATA System: 2551 SUBJECT: EQUIPMENT/FURNISHINGS - Electrical/Electronic Equipment Centers - Main Equipment Center Drip Shield Repair

THIS BULLETIN 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 SERVICE BULLETIN TO THE NEW OPERATOR. IF APPLICABLE SPARES HAVE BEEN SOLD, SEND THIS SERVICE BULLETIN TO THE NEW OWNER.

CONCURRENT REQUIREMENTS Refer to Paragraph 1.B., Concurrent Requirements.

BACKGROUND This service bulletin will reduce the possibility of water penetration into the main equipment center (MEC).

Cracking of the MEC drip shield has allowed water to drip past the MEC drip shield and through the exhaust plenum into the MEC. Water penetration into the MEC could result in an electrical short and potential loss of several functions essential for safe flight.

Cracking in the MEC drip shield and exhaust plenum have each been identified as part of the leak path into the MEC. Multiple operators have reported a cracked MEC drip shield. These cracks can allow water to penetrate the MEC drip shield and enter the MEC.

This service bulletin is related to service bulletin 747-25A3588 which includes repairs of drip shield cracks, stiffens the drip shield top surface, and installs a fiberglass reinforcing overcoat to the top and sides of the drip shield. Boeing has received reports of additional cracking of the drip shield which is not mitigated by SB 747-25A3588. The reported additional cracking occurs at the lower radius of the MEC drip shield, adjacent to the floor beams.

This service bulletin will install a fiberglass reinforcing overcoat to the lower radius area of the MEC drip shield to prevent cracking. This will help prevent water intrusion into the MEC.

Boeing Service Related Problem (SRP) 747-SRP-25-0318 is related to this service bulletin.

This table is provided to operators for planning purposes only. Refer to the applicable sections for more information.

Original Issue: January 08, 2014 747-25A3640 5 of 26

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ReferenceAffectedPlanning Data Paragraph 1.E., Compliance and Paragraph

1.F., Approval YesAD Related Paragraph 1.H., Weight and Balance ChangesNoWeight and Balance Change Paragraph 1.I., Electrical Load DataNoElectrical Load Changed Paragraph 1.K., Publications AffectedNoPublications 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/PartsNoKits/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 85901-128RS) Gain access to MEC drip shield. Clean MEC drip shield. Install a fiberglass reinforcing overcoat. Close access.

EFFECTIVITY 747-400/400F 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 related to this service bulletin. The Airworthiness Directive will make the compliance tasks and times given in this service bulletin mandatory.

Boeing recommends that the change given in this service bulletin be done within 24 months after the original issue date of this service bulletin.

INDUSTRY SUPPORT INFORMATION Boeing warranty remedies are not available for the repair procedures given in this service bulletin.

MANPOWER Elapsed HoursTotal Task HoursAirplanes

9.0036.00All Airplanes Refer to Paragraph 1.G., Manpower.

MATERIAL INFORMATION Operator Supplied Parts/Materials.

Original Issue: January 08, 2014 747-25A3640 6 of 26 BOEING SERVICE BULLETIN 747-25A3640

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BOEING SERVICE BULLETIN 747-25A3640

ALERT ALERT Refer to Paragraph 2.A., Material - Price and Availability.

000 GAIN ACCESS TO MEC DRIP SHIELD.

CLEAN MEC DRIP SHIELD.

STA INSTALL A FIBERGLASS 460 REINFORCING OVERCOAT.

CLOSE ACCESS.

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Original Issue: January 08, 2014 747-25A3640 8 of 26 BOEING SERVICE BULLETIN 747-25A3640

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THIS BULLETIN 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 SERVICE BULLETIN TO THE NEW OPERATOR. IF APPLICABLE SPARES HAVE BEEN SOLD, SEND THIS SERVICE BULLETIN TO THE NEW OWNER.

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 for the airplane(s) shown below. Refer to PRR 85901-128RS for data about this change.

DESCRIPTIONCONFIGURATIONGROUP 747-400F or 747-400 BCF airplanes.-1 747-400F or 747-400 BCF airplanes which have not accomplished 747-25A3588.

1 747-400F or 747-400 BCF airplanes which have accomplished 747-25A3588.

2 747-400 BCF airplanes that have had the intent of 747-25A3588 incorporated on the airplane during BCF modification.

-2 Airplane Models:

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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 1RM128 1RM851 - RM859 1RM861 - RM862 1RM871 - RM899 1RM901 - RM906 1RM911 1RR701 1RR721 - RR724 1RR746 - RR748 1RR851 - RR856 1RR861 - RR862 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.

Original Issue: January 08, 2014 747-25A3640 10 of 26 BOEING SERVICE BULLETIN 747-25A3640

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GroupVariable Number 1RR951 - RR952 1RT021 - RT022 1RT031 - RT033 2RT061 1RT071 - RT072 1RT101 1RT161 1RT164 1RT456 1RT501 1RT506 - RT510 1RT513 1RT516 1RT518 - RT520 1RT524 1RT526 1RT528 2RT530 1RT572 - RT579 1RT642 1RT655 - RT657 2RT691 - RT692 1RT751 - RT752 1RT781 - RT782 1RT837 1RT967

2. Spares Affected None.

B. Concurrent Requirements Group 1, Configuration 1:

The service bulletin listed below must be done before or at the same time as this service bulletin:

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DescriptionService BulletinCompany Main Equipment Center Drip Shield Repair747-25A3588 Original Issue, Revision 1, Revision 2, or Revision 3.

The Boeing Company Group 1, Configuration 2; Group 2:

None.

C. Reason This service bulletin will reduce the possibility of water penetration into the main equipment center (MEC). Cracking of the MEC drip shield has allowed water to drip past the MEC drip shield and through the exhaust plenum into the MEC. Water penetration into the MEC could result in an electrical short and potential loss of several functions essential for safe flight.

This service bulletin will install a fiberglass reinforcing overcoat to the lower radius area of the MEC drip shield to prevent cracking. This will help prevent water intrusion into the MEC.

Boeing Service Related Problem (SRP) 747-SRP-25-0318 is related to this service bulletin.

D. Description Gain access to MEC drip shield. Clean MEC drip shield. Install a fiberglass reinforcing overcoat. Close access.

The work in this service bulletin is done in the maintenance zone(s) given below.

Group 1:

Affected Maintenance Zones ZoneModel 117, 118747-400, 747-400F Group 2:

Original Issue: January 08, 2014 747-25A3640 12 of 26 BOEING SERVICE BULLETIN 747-25A3640

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