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Commercial Airplanes 747 Service Bulletin ALERT Number: 747-54A2247 Original Issue: August 03, 2017 ATA System: 5461 SUBJECT: NACELLES/PYLONS - No.1 and No.4 Engines Strut Aft Fairings - Vapor Seal, Block Seal, Heat Shield Seal and Seal Retainer Change 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.

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Original Issue: August 03, 2017 747-54A2247 2 of 50 BOEING SERVICE BULLETIN 747-54A2247

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Table of Contents

Summary5

1. PLANNING INFORMATION9

A. Effectivity9

1. Airplanes9

2. Spares Affected10

B. Concurrent Requirements10

C. Reason11

D. Description11

E. Compliance12

F. Approval12

G. Manpower12

H. Weight and Balance Changes13

I. Electrical Load Data13

J. References14

1. Existing Data:14

2. Data Supplied with this Service Bulletin:14

3. Installation Drawings Used in the Preparation of this Service Bulletin:14

K. Publications Affected14

L. Interchangeability and Intermixability of Parts15

M. Software Accomplishment Summary15

2. MATERIAL INFORMATION17

A. Material - Price and Availability17

B. Industry Support Information18

C. Parts Necessary for Each Airplane18

1. Kits/Parts18

2. Parts and Materials Supplied by the Operator20

3. Parts Modified and Reidentified21

4. Parts Removed and Not Replaced21

D. Parts Necessary to Change Spares21

E. Special Tooling - Price and Availability21

F. Special Tooling Necessary to do this Service Bulletin21

3. ACCOMPLISHMENT INSTRUCTIONS23

A. GENERAL INFORMATION23

B. WORK INSTRUCTIONS24

FIGURE 1: NO.1 STRUT - VAPOR SEALS, BLOCK SEALS AND HEAT SHIELD SEALS REMOVAL . 26 FIGURE 2: NO.4 STRUT - VAPOR SEALS, BLOCK SEALS AND HEAT SHIELD SEALS REMOVAL . 28 FIGURE 3: NO.1 STRUT - VAPOR SEALS, BLOCK SEALS AND HEAT SHIELD SEALS INSTALLATION

.30

FIGURE 4: NO.4 STRUT - VAPOR SEALS, BLOCK SEALS AND HEAT SHIELD SEALS INSTALLATION

.33

FIGURE 5: NO.1 STRUT - AFT FAIRING NEW PART MARK36

FIGURE 6: NO.4 STRUT - AFT FAIRING NEW PART MARK39

FIGURE 7: NO.1 STRUT - LATERAL RESTRAINT ACCESS PANEL MODIFICATION [Group 1] . . . 42 FIGURE 8: NO.4 STRUT - LATERAL RESTRAINT ACCESS PANEL MODIFICATION [Group 1] . . . 44 FIGURE 9: NO.1 STRUT - LATERAL RESTRAINT ACCESS PANEL MODIFICATION [Group 2] . . . 46 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.

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FIGURE 10: NO.4 STRUT - LATERAL RESTRAINT ACCESS PANEL MODIFICATION [Group 2] . . . 48

APPENDIX A: PART DEMAND INTENT50

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Commercial Airplanes 747 Service Bulletin ALERT SummaryNumber: 747-54A2247Original Issue: August 03, 2017 ATA System: 5461 SUBJECT: NACELLES/PYLONS - No.1 and No.4 Engines Strut Aft Fairings - Vapor Seal, Block Seal, Heat Shield Seal and Seal Retainer Change

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.

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

BACKGROUND Accomplishment of this service bulletin will prevent heat damage on the vapor seal between the strut and aft fairing of the number 1 and number 4 engines. In the event of a flammable fluid leakage in the aft fairing structure, damaged vapor seals could result in an uncontained engine strut fire.

Boeing has received reports from operators of damaged vapor seals, block seals, and heat shield seals on number 1 and number 4 engines aft strut fairings. As a result, Boeing has issued Service Bulletin 747-54A2246 to inspect for heat damage and replace heat damaged parts.

Since the release of Boeing Service Bulletin 747-54A2246, Boeing has designed new and improved heat shield seal and retainer, block seals and access panels to prevent hot exhaust gases from entering the aft fairing. This new and improved design includes the following improvements:

– The new heat shield seal prevents hot exhaust gas flowing into the aft fairing with redesigned seal and retainer – The new block seals seal the edges of the aft fairing between the heat shield seal and vapor seal – The new access panels allow external airflow into the space between strut and aft fairing This service bulletin gives instructions to modify the heat shield seal and retainer, block seals, and replace the existing vapor seal and access panel. Accomplishment of this replacement is terminating action for the inspection requirements in SAFETY RELATED - INITIAL AND REPEAT INSPECTIONS AND REPLACEMENT OF SEALS in accordance with SB 747-54A2246. In addition, a final one-time accomplishment of ECONOMIC RELATED - STRUCTURAL INSPECTION AND REPAIR FOR HEAT DAMAGE in accordance with SB 747-54A2246 and accomplishment of this service bulletin is the terminating action to the economic related inspections of SB 747-54A2246.

Boeing Service Related Problem (SRP) 747-8-SRP-54-0153 is related to this service bulletin.

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

ReferenceAffectedPlanning Data Paragraph 1.A.2., Spares AffectedNoSpares Affected 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 AffectedYesPublications 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/PartsYesKits/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 85901-156S) Deactivate the trailing edge flaps. Remove and keep the aft fairings at the number 1 and number 4 engine strut.

Remove vapor seals. Remove block seals. Remove heat shield seals and heat shield seal retainer. Install new vapor seal. Install new block seals. Install new heat shield seal and heat shield seal retainer. Install the kept aft fairings at the number 1 and number 4 engine strut. Remove lateral restraint access panels. Install new lateral restraint access panels. Activate the trailing edge flaps.

EFFECTIVITY 747-8/8F Airplanes. Refer to Paragraph 1.A.1., Airplanes, for the list of affected airplanes.

COMPLIANCE Federal Aviation Administration (FAA) Airworthiness Directive AD 2017-04-13 is related to this service bulletin.

The effective date of AD 2017-04-13 is April 3, 2017.

The Federal Aviation Administration (FAA) will possibly release an additional 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 modification given in this service bulletin be done within 4 years or 4,800 flight cycles after the original issue date of this service bulletin, whichever occurs first.

NOTE: Accomplishment of this modification is terminating action for the inspection requirements in SAFETY RELATED - INITIAL AND REPEAT INSPECTIONS AND REPLACEMENT OF SEALS in accordance with Boeing Service Bulletin 747-54A2246.

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Refer to Paragraph 1.E., Compliance.

INDUSTRY SUPPORT INFORMATION Boeing warranty remedies are available for airplanes in warranty as of February 12, 2015. Please refer to Paragraph 2.B., Industry Support Information. The warranty remedies will expire eight years from the original issue date of this service bulletin.

MANPOWER Refer to Paragraph 1.G., Manpower.

MATERIAL INFORMATION Boeing Supplied Kits/Parts.

Operator Supplied Parts/Materials.

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

Operators are encouraged to complete the survey provided in APPENDIX A of this service bulletin to help Boeing predict the quantity and timing of the Boeing Supplied Kits/Parts.

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BOEING SERVICE BULLETIN 747-54A2247

ALERT ALERT

NACELLE STRUT

ASSEMBLY ENGINE

COWLING

- G NO.1 OUTBOARD NACELLE (NO.4 OUTBOARD NACELLE OPPOSITE)

DO THE MODIFICATION TO INSTALL

NEW AND IMPROVED HEAT SHIELD

SEAL, SEAL RETAINER, BLOCK

SEALS, AND LATERAL RESTRAINT

ACCESS PANEL WD NO. 1 AND NO. 4 STRUT AFT FAIRING (NO. 4 OPPOSITE OUTBOARD STRUT) 2554562 Original Issue: August 03, 2017 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 8 of 50

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1. PLANNING INFORMATION A. Effectivity

1. Airplanes This service bulletin is applicable to 747-8/8F Airplanes, line numbers 1420-1540 in 2 Groups.

The Variable Numbers and Group Information for the applicable airplanes is given below. An equivalent change is on subsequent production airplanes. Refer to PRR 85901-156S for data about this change.

Refer to Service Bulletin Index D6-30300 Part 3 for Airplane Variable Number, Line Number, and Serial Number data.

DESCRIPTIONCONFIGURATIONGROUP Airplane line numbers 1420 - 1453 that have the 321U8595-1/-2 lateral restraint access panels installed.

-1 Airplane line numbers 1454 - 1540 that have the 321U8595-3/-4 lateral restraint access panels installed.

-2 Airplane Models:

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GroupVariable Number 1RC021 - RC024 2RC025 - RC040 2RC051 - RC060 2RC066 - RC072 2RC076 - RC077 1RC501 - RC504 2RC505 - RC514 1RC521 - RC523 2RC524 - RC528 1RC541 1RC546 2RC547 - RC550 1RC551 - RC557 2RC558 - RC566 1RC571 - RC576 2RC577 - RC582 1RC601 - RC603 2RC604 - RC606 2RC641 - RC644 2RC651 - RC652 2RC661 2RC671 - RC674

2. Spares Affected None.

B. Concurrent Requirements The service bulletins listed below must be done at the same time as this service bulletin:

DescriptionService BulletinCompany A final one time ECONOMIC RELATED -

STRUCTURAL INSPECTION AND REPAIR FOR HEAT DAMAGE on the strut aft fairing.

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DescriptionService BulletinCompany

(a) Accomplishment of a final, one-time ECONOMIC RELATED - STRUCTURAL INSPECTION AND REPAIR FOR HEAT DAMAGE in accordance with 747-54A2246 and accomplishment of this service bulletin is the terminating action to the economic related inspections of 747-54A2246.

C. Reason Accomplishment of this service bulletin will prevent heat damage on the vapor seal between the strut and aft fairing of the number 1 and number 4 engines. In the event of a flammable fluid leakage in the aft fairing structure, damaged vapor seals could result in an uncontained engine strut fire.

Boeing Service Related Problem (SRP) 747-8-SRP-54-0153 is related to this service bulletin.

D. Description Deactivate the trailing edge flaps. Remove and keep the aft fairings at the number 1 and number 4 engine strut. Remove vapor seals. Remove block seals. Remove heat shield seals and heat shield seal retainer. Install new vapor seal. Install new block seals. Install new heat shield seal and heat shield seal retainer. Install the kept aft fairings at the number 1 and number 4 engine strut. Remove lateral restraint access panels. Install new lateral restraint access panels. Activate the trailing edge flaps.

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

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E. Compliance Federal Aviation Administration (FAA) Airworthiness Directive AD 2017-04-13 is related to this service bulletin. The effective date of AD 2017-04-13 is April 3, 2017.

Boeing recommends that the modification given in this service bulletin be done within 4 years or 4,800 flight cycles after the original issue date of this service bulletin, whichever occurs first.

NOTE: Accomplishment of this modification is terminating action for the inspection requirements in

SAFETY RELATED - INITIAL AND REPEAT INSPECTIONS AND REPLACEMENT OF SEALS in accordance with Boeing Service Bulletin 747-54A2246.

F. Approval This service bulletin was examined by the Federal Aviation Administration (FAA). The changes specified in this service bulletin comply with the applicable regulations and are FAA approved, as well as European Aviation Safety Agency (EASA)/Joint Aviation Authorities (JAA) approved for all EASA/JAA approved airplanes listed in the service bulletin effectivity. This service bulletin and its approval were based on the airplane in its original Boeing delivery configuration or as modified by other approved Boeing changes.

If an airplane has a non-Boeing modification or repair that affects a component or system also affected by this service bulletin, the operator is responsible for obtaining appropriate regulatory agency approval before incorporating this service bulletin.

In addition, the Manager of the FAA Seattle approves the action (i.e. inspection or modification) defined in this service bulletin as an alternative method of compliance to the requirements of paragraphs (g) and (h) of AD 2017-04-13. All provisions of AD 2017-04-13 that are not specifically referenced in the above statement remain fully applicable and must be complied with.

G. Manpower The table below shows an estimate of the task hours necessary to do this change for each airplanes.

This estimate is for direct labor only, done by an experienced crew. Adjust the estimate with operator task hour data if necessary. The estimate does not include lost time. These are some examples of lost time:

• Time to adjust to the workplace

• Time to schedule the work

• Time to inspect the work

• Time to cure the materials

• Time to make the parts

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