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Commercial Airplanes 747 Service Bulletin ALERT Number: 747-71A2329 Original Issue: September 27, 2013 ATA System: 7121 SUBJECT: POWER PLANT - Engine Mounts - Forward Engine Mount Barrel Nut Inspection and Replacement 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: September 27, 2013 747-71A2329 1 of 40

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Original Issue: September 27, 2013 747-71A2329 2 of 40 BOEING SERVICE BULLETIN 747-71A2329

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Table of Contents

S u m m a r y5

1. PLANNING INFORMATION9

A . E f f e c t i v i t y9

1. Airplanes9

2 . S p a r e s A f f e c t e d ........................................ 1 0 B. Concurrent Requirements ...................................... 1 0 C. Reason ................................................ 1 0 D. Description .............................................. 1 1 E. Compliance .............................................. 1 2 F . A p p r o v a l ............................................... 1 3 G. Manpower .............................................. 1 3 H. Weight and Balance Changes .................................... 1 4 I. Electrical Load Data ......................................... 1 4 J . R e f e r e n c e s .............................................. 1 4

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

2. Data Supplied with this Service Bulletin: ........................... 1 5

3. Installation Drawings Used in the Preparation of this Service Bulletin: ........... 1 5 K. Publications Affected ........................................ 1 5 L. Interchangeability and Intermixability of Parts ........................... 1 5 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 . K i t s / P a r t s ............................................ 1 7

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

3. Parts Modified and Reidentified ................................ 1 8

4. Parts Removed and Not Replaced .............................. 1 8 D. Parts Necessary to Change Spares ................................. 1 8 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 1 FIGURE 1: FORWARD ENGINE MOUNT BARREL NUT ULTRASONIC (UT) INSPECTION ..... 2 3 FIGURE 2: FORWARD ENGINE MOUNT BOLT AND BARREL NUT REPLACEMENT ........ 2 6 APPENDIX A: INSPECTION RESULTS REPORT .............................. 3 0 APPENDIX B: ULTRASONIC (UT) INSPECTION PROCEDURE ...................... 3 4 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.

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Original Issue: September 27, 2013 747-71A2329 4 of 40 BOEING SERVICE BULLETIN 747-71A2329

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Commercial Airplanes 747 Service Bulletin ALERT SummaryNumber: 747-71A2329Original Issue: September 27, 2013 ATA System: 7121 SUBJECT: POWER PLANT - Engine Mounts - Forward Engine Mount Barrel Nut Inspection and Replacement

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 None.

BACKGROUND Accomplishment of this service bulletin will make sure the barrel nuts on the forward engine mount do not have a crack. A crack on both sides of the barrel nut will cause complete failure of the barrel nut. Complete failure of two or more barrel nuts on the same engine reduces the load capacity of the forward engine mount and could result in separation of an engine from the airplane. Separation of an inboard engine under power could result in loss of control of the airplane.

An operator reported that while replacing the No.2 engine, the Non Destructive Test (NDT) inspection of the barrel nuts on the forward engine mount revealed cracks on 2 out of 4 barrel nuts. The operator also discovered 1 cracked barrel nut on the No. 1 engine. This is the first reported occurrence on the 747-8. Also, The Boeing Company did a NDT inspection of barrel nuts on a flight test airplane. There were 2 barrel nuts where a crack had initiated on the No. 2 engine. These barrel nuts are located at the forward end of the strut box and are used to fasten the forward engine mount to the strut. A barrel nut with a crack on one side will still be able to carry ultimate load. A crack on both sides of the barrel nut will cause complete failure of the barrel nut. Boeing has not received any reports of a barrel nut with a crack on both sides.

This service bulletin gives instructions to inspect the barrel nuts on the forward engine mount and replace barrel nuts that have a crack. This will prevent the complete failure of barrel nuts that could result in the separation of an engine from the airplane. This service bulletin also has operators report the results of barrel nut inspections to Boeing, as well as sending any cracked parts to Boeing. The inspection reports will be used in the root cause investigation of this issue.

Boeing will issue a service bulletin for terminating action of this issue after completion of the root cause investigation.

Boeing Fleet Team Digest (FTD) 747 FTD 71-13001 is related to this service bulletin.

Boeing Service Related Problem (SRP) 747-8-SRP-71-0060 is related to this service bulletin.

Original Issue: September 27, 2013 747-71A2329 5 of 40

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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 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

1. Do ultrasonic (UT) inspection of the barrel nuts on the forward engine mount for cracked barrel nuts or removal and dye penetrant inspection of existing bolt and barrel nuts and installation of new or serviceable bolt and barrel nuts on the forward engine mount.

Condition 1: No Crack Found During UT Inspection

a. Send inspection results report and any cracked bolts and barrel nuts to Boeing.

b. Repeat ultrasonic (UT) inspection of the barrel nuts on the forward engine mount for cracked barrel nuts or removal and dye penetrant inspection of existing bolt and barrel nuts and installation of new or serviceable bolt and barrel nuts on the forward engine mount.

Condition 2: Any Crack Found On Any Barrel Nut During UT Inspection

a. Do removal and dye penetrant inspection of existing bolt and barrel nuts and installation of new or serviceable bolt and barrel nuts on the forward engine mount.

b. Send inspection results report and any cracked bolts and barrel nuts to Boeing.

c. Repeat ultrasonic (UT) inspection of the barrel nuts on the forward engine mount for cracked barrel nuts or removal and dye penetrant inspection of existing bolt and barrel nuts and installation of new or serviceable bolt and barrel nuts on the forward engine mount.

Condition 3: Barrel nuts replaced in accordance with removal and dye penetrant inspection of existing bolt and barrel nuts and installation of new or serviceable bolt and barrel nuts on the forward engine mount.

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a. Send inspection results report and any cracked bolts and barrel nuts to Boeing.

EFFECTIVITY All 747-8/-8F Airplane(s). Refer to Paragraph 1.A.1., Airplanes, for the list of affected airplane(s).

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.

Refer to Paragraph 1.E., Compliance.

INDUSTRY SUPPORT INFORMATION At the time of release of this service bulletin, warranty remedies have not been determined. A subsequent revision or Information Notice will address the warranty remedies available, if any.

MANPOWER Elapsed HoursTotal Task HoursEngines

6.006.00PART 1: ULTRASONIC (UT) INSPECTION OF BARREL

NUTS ON FORWARD ENGINE MOUNT

6.8016.40PART 2: REMOVAL AND DYE PENETRANT INSPECTION

OF EXISTING BOLT AND BARREL NUTS AND INSTALLA-

TION OF NEW OR SERVICEABLE BOLT AND BARREL

NUTS ON FORWARD ENGINE MOUNT

(a)(a)PART 3: SEND APPENDIX A INSPECTION RESULTS RE-

PORT AND ANY CRACKED BOLTS AND BARREL NUTS

(a) No manpower estimate was calculated for this task.

Refer to Paragraph 1.G., Manpower.

MATERIAL INFORMATION Operator Supplied Parts/Materials.

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

Original Issue: September 27, 2013 747-71A2329 7 of 40 BOEING SERVICE BULLETIN 747-71A2329

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BOEING SERVICE BULLETIN 747-71A2329

ALERT ALERT

DO ULTRASONIC (UT) INSPECTION OF THE

BARREL NUTS ON THE FORWARD ENGINE

MOUNT FOR CRACKED BARREL NUTS OR

REMOVAL AND DYE PENETRANT

INSPECTION OF EXISTING BOLT AND

BARREL NUTS AND INSTALLATION OF NEW

OR SERVICEABLE BOLT AND BARREL NUTS

ON THE FORWARD ENGINE MOUNT CONDITION 1: NO CRACK FOUND DURING UT

INSPECTION -SEND INSPECTION RESULTS REPORT AND

ANY CRACKED BOLTS AND BARREL NUTS

TO BOEING -REPEAT ULTRASONIC (UT) INSPECTION

OF THE BARREL NUTS ON THE FORWARD

ENGINE MOUNT FOR CRACKED BARREL

NUTS OR REMOVAL AND DYE PENETRANT

INSPECTION OF EXISTING BOLT AND

BARREL NUTS AND INSTALLATION OF

NEW OR SERVICEABI E BOLT AND BARREL

NUTS ON THE FORWARD ENGINE MOUNT CONDITION 2: ANY CRACK FOUND ON ANY

BARREL NUT DURING UT INSPECTION -DO REMOVA OYE PENETRANT

INSPECTION OF

BARREL NUTS ISTALLATION OF NEW

OR SERVICEAB E BOLT AND BARREL NUTS

ON THE FORWARD ENGINE MOUNT -SEND INSPECTION RESULTS REPORT AND

ANY CRACKED BOLTS AND BARREL NUTS TO BOEING -REPEAT ULTRASONIC (UT) INSPECTION OF

THE BARREL NUTS ON THE FORWARD

ENGINE MOUNT FOR CRACKED BARREL

NUTS OR REMOVAL AND DYE PENETRANT

INSPECTION OF E ING BOLT AND

BARREL NUTS A ND INSTALLA TION OF NEW

OR SERVICEAB E BOLT AND BARREL NUTS

ON THE FORWARD ENGINE MOUNT CONDITION 3: BARREL NUTS REPLACED IN

ACCORDANCE WITH REMOVAL AND DYE

PENETRANT INSPECTION OF EXISTING BOLT

AND BARREL NUTS AND INSTALLATION OF

NEW OR SERVICEABLE BOLT AND BARREL

NUTS ON THE FORWARD ENGINE MOUNT -SEND INSPECTION RESULTS REPORT AND

ANY CRACKED BOLTS AND BARREL NUTS TO BOEING -REPEAT ULTRASONIC (UT) INSPECTION OF

THE BARREL NUTS ON THE FORWARD

ENGINE MOUNT FOR CRACKED BARREL

NUTS OR REMOVAL AND DYE PENETRANT

INSPECTION OF EXISTING BOLT AND BARREL

NUTS AND INSTALLATION OF NEW OR

SERVICEABLE BOLT AND BARREL NUTS ON

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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.

NOTE: This service bulletin is for the airplanes shown in the effectivity list below. The effectivity list includes all affected airplanes scheduled to be delivered before SEP 22, 2014. In addition, at least one airplane scheduled to be delivered after SEP 22, 2014 is affected by this service bulletin and is in Group(s) 1 as described in the Group Configuration table.

Affected airplanes will be added to the service bulletin's MyBoeingFleet.com (MBF) "get effectivity" result when they are added to the MBF Fleet Profile Page.

DESCRIPTIONCONFIGURATIONGROUP All 747-8/-8F airplanes.-1 Airplane Models:

Original Issue: September 27, 2013 747-71A2329 9 of 40

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GroupVariable Number 1RC066 1RC501 - RC509 1RC511 1RC521 - RC528 1RC541 1RC546 - RC549 1RC551 - RC563 1RC571 - RC572 1RC574 - RC582 1RC601 - RC605 1RC641 - RC642 1RC671 - RC672

2. Spares Affected None.

B. Concurrent Requirements None.

C. Reason Accomplishment of this service bulletin will make sure the barrel nuts on the forward engine mount do not have a crack. A crack on both sides of the barrel nut will cause complete failure of the barrel nut.

Complete failure of two or more barrel nuts on the same engine reduces the load capacity of the forward engine mount and could result in separation of an engine from the airplane. Separation of an inboard engine under power could result in loss of control of the airplane.

Original Issue: September 27, 2013 747-71A2329 10 of 40 BOEING SERVICE BULLETIN 747-71A2329

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Boeing will issue a service bulletin for terminating action of this issue after completion of the root cause investigation.

Boeing Fleet Team Digest (FTD) 747 FTD 71-13001 is related to this service bulletin.

Boeing Service Related Problem (SRP) 747-8-SRP-71-0060 is related to this service bulletin.

D. Description

Condition 1: No Crack Found During UT Inspection

a. Send inspection results report and any cracked bolts and barrel nuts to Boeing.

Condition 2: Any Crack Found On Any Barrel Nut During UT Inspection

a. Do removal and dye penetrant inspection of existing bolt and barrel nuts and installation of new or serviceable bolt and barrel nuts on the forward engine mount.

b. Send inspection results report and any cracked bolts and barrel nuts to Boeing.

a. Send inspection results report and any cracked bolts and barrel nuts to Boeing.

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

Original Issue: September 27, 2013 747-71A2329 11 of 40 BOEING SERVICE BULLETIN 747-71A2329

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E. 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.

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 number or an OPTION number, do all of the ACTION numbers for that CONDITION number or OPTION number.

The Conditions, Actions and Compliance times shown apply to each engine independently.

Do the required actions in accordance with Paragraph 3. Accomplishment Instructions.

The following abbreviations are used in the compliance tables:

1. PART 1: UT INSPECTION refers to PART 1: ULTRASONIC (UT) INSPECTION OF BARREL NUTS ON FORWARD ENGINE MOUNT.

2. PART 2: DYE PENETRANT INSPECTION refers to PART 2: REMOVAL AND DYE PENETRANT

INSPECTION OF EXISTING BOLT AND BARREL NUTS AND INSTALLATION OF NEW OR SERVICEABLE BOLT AND BARREL NUTS ON FORWARD ENGINE MOUNT.

3. PART 3: SEND REPORT AND ANY CRACKED PARTS refers to PART 3: SEND APPENDIX A INSPECTION RESULTS REPORT AND ANY CRACKED BOLTS AND BARREL NUTS.

Table 1: Inspection of the Barrel Nuts on the Forward Engine Mount Repeat Interval (Not to Exceed) Compliance Time (Whichever occurs later) ActionCondition 200 flight cycles (a) Within 30 days after the original issue date of this service bulletin.

Within 200 flight cycles from the date of issuance of the original certificate of airworthiness or the original export certificate of airworthiness.

Do PART 1: UT INSPECTION or PART 2: DYE PENETRANT IN- SPECTION. (b) All Airplanes --Within 10 days after accomplishment of PART 1: UT INSPECTION.

ACTION 1:

Do PART 3: SEND REPORT AND ANY CRACKED PARTS.

CONDITION 1: NO

CRACK FOUND

DURING UT IN-

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