Commercial 

Airplanes 747

Service Bulletin

ALERT

Number: 747-27A2506

Original Issue: February 03, 2014

ATA System: 2709

SUBJECT: FLIGHT CONTROLS - Flight Controls Electronics - Lateral Control Electronic Module

Replacement

Export of this technology is controlled under the United States Export Administration Regulations (EAR) (15

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persons from specific countries. The controller of this data has the individual responsibility to abide by all export

laws.

ECCN: 9E991

BOEING PROPRIETARY, CONFIDENTIAL AND/OR TRADE SECRET

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BLANK PAGE
Table of Contents

Summary ...................................................... 5

1. PLANNING INFORMATION ........................................ 9

A. Effectivity ................................................ 9

1. Airplanes ............................................. 9

2. Spares Affected . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

B. Concurrent Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

C. Reason . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

D. Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

E. Compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

F. Approval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

G. Manpower . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

H. Weight and Balance Changes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

I. Electrical Load Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

J. References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

1. Existing Data: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

2. Data Supplied with this Service Bulletin: . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

3. Installation Drawings Used in the Preparation of this Service Bulletin: . . . . . . . . . . . 13

K. Publications Affected . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

L. Interchangeability and Intermixability of Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

M. Software Accomplishment Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

2. MATERIAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

A. Material - Price and Availability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

B. Industry Support Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

C. Parts Necessary for Each Airplane . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

1. Kits/Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

2. Parts and Materials Supplied by the Operator . . . . . . . . . . . . . . . . . . . . . . . . 15

3. Parts Modified and Reidentified . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

4. Parts Removed and Not Replaced . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

D. Parts Necessary to Change Spares . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

E. Special Tooling - Price and Availability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

F. Special Tooling Necessary to do this Service Bulletin . . . . . . . . . . . . . . . . . . . . . . . 16

3. ACCOMPLISHMENT INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

A. GENERAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

B. WORK INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

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BLANK PAGE
Commercial 

Airplanes 747

Service Bulletin

ALERT

Summary Number: 747-27A2506

Original Issue: February 03, 2014

ATA System: 2709

SUBJECT: FLIGHT CONTROLS - Flight Controls Electronics - Lateral Control Electronic Module

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

This service bulletin provides instructions to replace the existing Lateral Control Electronic (LCE) modules with

new LCE modules with revised software. There are two (2) LCE modules that each operate six (6) spoiler Power

Control Units (PCUs) and two (2) outboard aileron PCUs. If the existing LCE modules are not replaced, there

is a possibility for divergent flutter or unacceptable vibration for certain parts of the flight envelope. Divergent

flutter could result in loss of controllability of the airplane.

Boeing observed an airplane had experienced a large 2.3 Hertz (Hz) vibration during a steady turn at 1.8 g-force

(g) load factor during developmental flight testing. Boeing determined that the solution to this problem should

be extended to all 747-8 and 747-8F airplanes. No operators have reported any divergent flutter or unacceptable

vibration in service.

The existing LCE modules have a control system architecture that allows symmetric outboard spoiler (positions

1 or 2 and 11 or 12) deflections more than six (6) degrees. Deflections above six (6) degrees can adversely

affect the airplane flutter stability during high g maneuvers in certain parts of the flight envelope.

The new LCE modules have a control system architecture that will limit the symmetric outboard spoiler deflections

to six (6) degrees. Additional changes were made to increase the LCE module's capabilities and decrease

nuisance messages during electrical power transitions.

Boeing Service Related Problem (SRP) 747-8-SRP-27-0234 is related to this service bulletin.

Boeing Fleet Team Digest (FTD) 747 FTD 27-13008 is related to this service bulletin.

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

information.

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Planning Data Affected Reference

Spares Affected Yes Paragraph 1.A.2., Spares Affected

Paragraph 1.E., Compliance and Paragraph

1.F., Approval

AD Related Yes

Weight and Balance Change No Paragraph 1.H., Weight and Balance Changes

Electrical Load Changed No Paragraph 1.I., Electrical Load Data

Publications Affected Yes Paragraph 1.K., Publications Affected

Airplane Flight Operations Affected (Flight Crew No Paragraph 1.K., Publications Affected

Operations Manual and/or FAA Approved Airplane Flight Manual)

Kits/Parts Required No Paragraph 2.C.1., Kits/Parts

Paragraph 2.C.2., Parts and Materials Supplied

by the Operator

Operator Supplied Parts/Material Yes

Paragraph 2.F., Special Tooling Necessary to

do this Service Bulletin

Special Tooling Required No

ACTION (PRR 86601-2)

1. Open access to the Main Equipment Center (MEC).

2. Remove the two (2) LCE modules.

3. Adjust the polarization post of the electrical connectors on the E1-2 and E2-2 shelves.

4. Change the part number on each changed electrical connector.

5. Install the new LCE modules, part number CA49253-003.

6. Do the LCE module operational test.

7. Close access to the MEC.

8. Put the airplane back to a serviceable condition.

EFFECTIVITY

747-8 and 747-8F 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 12 months after the original

issue date of this service bulletin.

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ALERT ALERT
INDUSTRY SUPPORT INFORMATION

Boeing warranty remedies are available for airplanes in warranty as of July 11, 2011. 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.

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

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BLANK PAGE
Commercial 

Airplanes 747

Service Bulletin

ALERT

Number: 747-27A2506

Original Issue: February 03, 2014

ATA System: 2709

SUBJECT: FLIGHT CONTROLS - Flight Controls Electronics - Lateral Control Electronic Module

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.

1. PLANNING INFORMATION

A. Effectivity

1. Airplanes

This service bulletin is for the airplane(s) shown below. An equivalent change is on subsequent

production airplanes. Refer to PRR 86601-2 for data about this change.

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

Serial Number data.

NOTE: Variable numbers for airplanes scheduled to be delivered more than a year after the

Original Issue date of this service bulletin are not listed in the table below. MyBoeingFleet

(MBF) will show current listing of the affected airplanes.

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 DEC 02, 2014. In

addition, at least one airplane scheduled to be delivered after DEC 02, 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.

GROUP CONFIGURATION DESCRIPTION

747-8 and 747-8F airplanes, lines numbers 1420 through 1434, and

1436 through 1491

1 -

Airplane Models:

747-8, 747-8F

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Variable Number Group

RC001 - RC008 1

RC022 - RC030 1

RC501 - RC511 1

RC521 - RC528 1

RC541 1

RC546 - RC549 1

RC551 - RC563 1

RC571 - RC572 1

RC574 - RC582 1

RC601 - RC605 1

2. Spares Affected

Examine your spares supply for the parts or components identified below. If any parts or components

are found, refer to Paragraph 2.C.2., Parts and Materials Supplied by the Operator, for the

recommended action.

Part Number

CA49253-001

CA49253-002

B. Concurrent Requirements

None.

C. Reason

This service bulletin provides instructions to replace the existing Lateral Control Electronic (LCE)

modules with new LCE modules with revised software. There are two (2) LCE modules that each

operate six (6) spoiler Power Control Units (PCUs) and two (2) outboard aileron PCUs. If the existing

LCE modules are not replaced, there is a possibility for divergent flutter or unacceptable vibration for

certain parts of the flight envelope. Divergent flutter could result in loss of controllability of the airplane.

Boeing observed an airplane had experienced a large 2.3 Hertz (Hz) vibration during a steady turn at

1.8 g-force (g) load factor during developmental flight testing. Boeing determined that the solution to

this problem should be extended to all 747-8 and 747-8F airplanes. No operators have reported any

divergent flutter or unacceptable vibration in service.

The existing LCE modules have a control system architecture that allows symmetric outboard spoiler

(positions 1 or 2 and 11 or 12) deflections more than six (6) degrees. Deflections above six (6) degrees

can adversely affect the airplane flutter stability during high g maneuvers in certain parts of the flight

envelope.

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ALERT ALERT
The new LCE modules have a control system architecture that will limit the symmetric outboard spoiler

deflections to six (6) degrees. Additional changes were made to increase the LCE module's capabilities

and decrease nuisance messages during electrical power transitions.

Boeing Service Related Problem (SRP) 747-8-SRP-27-0234 is related to this service bulletin.

Boeing Fleet Team Digest (FTD) 747 FTD 27-13008 is related to this service bulletin.

D. Description

1. Open access to the Main Equipment Center (MEC).

2. Remove the two (2) LCE modules.

3. Adjust the polarization post of the electrical connectors on the E1-2 and E2-2 shelves.

4. Change the part number on each changed electrical connector.

5. Install the new LCE modules, part number CA49253-003.

6. Do the LCE module operational test.

7. Close access to the MEC.

8. Put the airplane back to a serviceable condition.

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

Affected Maintenance Zones

Model Zone

747-8, 747-8F 117, 118

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.

Boeing recommends that the replacement given in this service bulletin be done within 12 months after

the original issue date of this service bulletin.

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.

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BOEING SERVICE BULLETIN 747-27A2506

ALERT ALERT
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.

G. Manpower

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

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

• Time to find the tools.

Task Number of Persons Task Hours Elapsed Hours

Open Access 1 1.00 1.00

Install 1 0.50 0.50

Close Access 1 1.00 1.00

Test 1 1.25 1.25

TOTAL FOR EACH AIRPLANE 3.75 3.75

H. Weight and Balance Changes

None.

I. Electrical Load Data

Not changed.

J. References

1. Existing Data:

a. Engineering Change Memo PRR 86601-2

b. Boeing Service Related Problem (SRP) 747-8-SRP-27-0234

c. Service Bulletin Index D6-30300

d. Standard Wiring Practices Manual (SWPM) 20-71-14

e. 747 Fleet Team Digest (FTD) 27-13008

f. 747-8 Aircraft Maintenance Manual (AMM) 27-09-01

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BOEING SERVICE BULLETIN 747-27A2506

ALERT ALERT
g. Moog Service Bulletin CA49253-27-02

2. Data Supplied with this Service Bulletin:

None.

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

Drawing Number Title

284U1800 EQUIPMENT INSTL - E1/E2 RACK, ELEX EQUIP CTR

The table above lists applicable drawings used to prepare this service bulletin. The drawings are

not necessary to make the specified changes, and are not supplied with this service bulletin. The

drawings may not be applicable to all airplane configurations or operators.

K. Publications Affected

1. Publications:

Publication Chapter-Section

747 Illustrated Parts Catalog 27-09

2. Damage Tolerance Based Structural Inspections:

Boeing has evaluated the repairs and/or changes in this service bulletin for effects on Fatigue

Critical Structure (FCS) and for changes to Damage Tolerance Inspections (DTI) required in the

Maintenance Program. This service bulletin does not affect FCS, therefore DTIs are not necessary.

L. Interchangeability and Intermixability of Parts

Refer to Paragraph 2.C., Parts Necessary for Each Airplane, for interchangeability and intermixability

information.

M. Software Accomplishment Summary

Not affected.

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BLANK PAGE
2. MATERIAL INFORMATION

A. Material - Price and Availability

The operator can supply the parts and materials shown in Paragraph 2.C., Parts Necessary for Each

Airplane. As an alternative, operators can purchase the parts from Boeing Spares. This service bulletin

does not show the Boeing price and supply data.

B. Industry Support Information

Boeing warranty remedies are available for 747 airplanes in warranty as of July 11, 2011. For task hour

and material reimbursement for airplanes in warranty as of that date, send a warranty claim to Boeing

Warranty & Product Assurance Contracts. The warranty remedies will expire eight years from the

original issue date of this service bulletin.

C. Parts Necessary for Each Airplane

1. Kits/Parts

None.

2. Parts and Materials Supplied by the Operator

The following parts or materials are necessary to do the change in this service bulletin. Parts and

materials in the manuals given in Paragraph 1.J., References, can also be necessary. Examine

operator part and material supply to make sure all necessary parts and materials are available.

Part Number / QTY Name Existing Part Number Notes

Specification

Lateral Control Electronic (LCE) CA49253-002 or CA49253-001 (a) (b) (c) (d)

Module

CA49253-003 2

(a) Moog SB CA49253-27-02 provides instructions to change the existing LCE module to the new LCE

module.

(b) This part is used in production.

(c) You cannot use the existing part to replace the new or changed part.

(d) Moog Aircraft Group (CAGE Code 0ZWK8), Seneca & Jamison Roads, Plant 24, East Aurora NY 14052

USA

3. Parts Modified and Reidentified

Existing Part Number QTY Name New Part Number Notes

BACC66H33F38AA01 2 Electrical Connector BACC66H33F42AA01 (a) (b) (c)

(a) Make the change in accordance with this service bulletin.

(b) This is the part number after the change is done in accordance with this service bulletin.

(c) This part is used in production.

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ALERT ALERT
4. Parts Removed and Not Replaced

None.

D. Parts Necessary to Change Spares

None.

E. Special Tooling - Price and Availability

None.

F. Special Tooling Necessary to do this Service Bulletin

No special tools or equipment are necessary to do the change in this service bulletin. But, maintenance

and overhaul tools in the manuals given in Paragraph 1.J., References, can be necessary. Examine

operator tool supply to make sure all necessary tools are available.

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ALERT ALERT
3. ACCOMPLISHMENT INSTRUCTIONS

A. GENERAL INFORMATION

NOTE: 1. Manual titles are referred to by acronyms. Refer to Paragraph 1.J., References, for

definition of the acronyms.

2. Obey all of the warnings and cautions given in the specified manual sections.

3. Unless shown differently, these dimensions and tolerances are used:

– Linear dimensions are in inches

– Tolerance on linear dimensions, other than rivet and bolt edge margins, is plus

or minus 0.03 inch

– Tolerance on rivet and bolt edge margin is plus or minus 0.05 inch

– Angular tolerance is plus or minus 2 degrees

– Hole dimensions for standard solid rivets and fasteners are in Structural Repair

Manual (SRM) Chapter 51

– Torque Values:

— Values for structural fasteners are given in 747 Structural Repair Manual,

Chapter 51.

— Values for airframe maintenance tasks are included in Chapter 20 of 747

Airplane Maintenance Manual (AMM).

— Values for electrical maintenance tasks are included in Chapter 20 of

Standard Wiring Practices Manual (SWPM).

— Values for engine maintenance tasks are included in Chapter 70 of 747

Airplane Maintenance Manual (AMM).

— Non-standard torque values for maintenance tasks are included in the

applicable installation step.

4. These work instructions refer to procedures included in other Boeing documents.

When the words "refer to" are used and the operator has an accepted alternative

procedure, the accepted alternative procedure can be used. When the words "in

accordance with" are included in the instruction, the procedure in the Boeing document

must be used.

5. If it is necessary to remove more parts for access, you can remove those parts. If

you can get access without removing identified parts, it is not necessary to remove

all of the identified parts. Jacking and shoring limitations must be observed.

6. Where the work instructions include installation of a kept part, a new or serviceable

part with the same part number can be installed as an alternative to the kept part.

7. This service bulletin includes functional test procedures for the systems changed by

this service bulletin. More functional tests can possibly be necessary in accordance

with standard maintenance practices because of interruption to other airplane systems.

8. If shading is used, shaded areas in Figures are to separate the non-critical and

non-authoritative information from the critical and authoritative information.

9. The compliance times for the actions in Paragraph 3.B., WORK INSTRUCTIONS

are in Paragraph 1.E., Compliance.

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ALERT ALERT
10. Some steps in the Work Instructions are identified as Required for Compliance (RC).

If this service bulletin is mandated by an Airworthiness Directive (AD), then the steps

identified as RC must be done to comply with the AD. Alternative procedures for

steps not identified with RC can be used if the RC steps can still be done as specified,

and the airplane can be put back in a serviceable condition. An Alternative Method

of Compliance (AMOC) is not necessary for deviations to steps that are not identified

as RC.

B. WORK INSTRUCTIONS

1. Open access to the E1-2 and E2-2 shelves in the Main Equipment Center (MEC).

2. RC - Remove the two (2) Lateral Control Electronic (LCE) modules from the E1-2 and E2-2 shelves

in the MEC. Refer to 747-8 AMM 27-09-01 as an accepted procedure.

NOTE: The equipment number locations on the shelves are M14704 (E1-2) located on the left

side and M14703 (E2-2) located on the right side.

3. RC - On the E1-2 and E2-2 shelves, adjust the polarization post on the electrical connectors to

Polarization Code 42. Refer to SWPM 20-71-14 as an accepted procedure.

NOTE: Once this step is completed, only LCE module part number CA49253-003 can be installed

on the E1-2 and E2-2 shelves.

4. Change the part number of each electrical connector to BACC66H33F42AA01. Refer to SWPM

20-71-14 as an accepted procedure.

5. RC - Install two (2) new LCE modules, part number CA49253-003, on the E1-2 and E2-2 shelves

in the MEC. Refer to 747-8 AMM 27-09-01 as an accepted procedure.

6. RC - Do an operational test of the LCE modules. Refer to 747-8 AMM 27-09-01 as an accepted

procedure.

7. Close access to the E1-2 and E2-2 shelves in the MEC.

8. Put the airplane back to a serviceable condition.

Export Controlled ECCN: 9E991 - BOEING

PROPRIETARY - Copyright © Unpublished

Work - See page 1 for details.

Original Issue: February 03, 2014

747-27A2506

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BOEING SERVICE BULLETIN 747-27A2506

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