Commercial 

Airplanes 767

Service Bulletin

ALERT

Number: 767-78A0100

Original Issue: October 26, 2010

ATA System: 7834

SUBJECT: EXHAUST (GE CF6-80 Series Engines) - Thrust Reverser Control System - Short

Flexible Drive Shaft Replacement

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3.0
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BOEING SERVICE BULLETIN 767-78A0100

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BLANK PAGE
Table of Contents

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

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

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

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

2. Spares Affected . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

B. Concurrent Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

C. Reason . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

D. Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

E. Compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

F. Approval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

G. Manpower . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

H. Weight and Balance Changes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

I. Electrical Load Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

J. References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

1. Existing Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

2. Data supplied with this Service Bulletin . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

3. Installation Drawings Used in the Preparation of this Service Bulletin . . . . . . . . . . . . 16

K. Publications Affected . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

L. Interchangeability and Intermixability of Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

2. MATERIAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

A. Material - Price and Availability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

B. Industry Support Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

C. Parts Necessary For Each Airplane . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

1. Kits/Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

2. Parts and Materials Supplied by the Operator . . . . . . . . . . . . . . . . . . . . . . . . 17

3. Parts Modified and Reidentified . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

4. Parts Removed and Not Replaced . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

D. Parts Necessary to Change Spares . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

E. Special Tooling - Price and Availability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

F. Special Tooling Necessary to do this Service Bulletin . . . . . . . . . . . . . . . . . . . . . . . 17

3. ACCOMPLISHMENT INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

A. GENERAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

B. WORK INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

FIGURE 1: THRUST REVERSER LEFT HALF ELECTRO-MECHANICAL BRAKE - SHORT FLEXSHAFT

REPLACEMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

FIGURE 2: THRUST REVERSER RIGHT HALF ELECTRO-MECHANICAL BRAKE - SHORT FLEXSHAFT

REPLACEMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

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Commercial 

Airplanes 767

Service Bulletin

ALERT

Summary Number: 767-78A0100

Original Issue: October 26, 2010

ATA System: 7834

SUBJECT: EXHAUST (GE CF6-80 Series Engines) - Thrust Reverser Control System - Short

Flexible Drive Shaft 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 prevent damage and the possible breakage of the short flexshafts

related to the electro-mechanical brake of General Electric (GE) CF6-80C2 engines. Flexshaft breakage removes

the primary level of protection against an uncommanded thrust reverser deployment occurrence. Uncommanded

T/R deployment could result in a loss of control of the airplane.

In 1998 operators first told Boeing of unserviceable short flexible drive shafts (also referred to as 'flexshafts')

related to the electro-mechanical brake of the Thrust Reverser Actuation System (TRAS) on GE CF6-80C2

engines. Boeing released service bulletin 767-78A0097 to replace these short flexshafts individually when

necessary. But since the release of that service bulletin, flexshaft damage and breakage has continued to occur.

The performance of the short flexshaft installed by service bulletin 767-78A0097 did not have the necessary

reliability for the system. Since its installation on GE CF6-80C2 engines, short flexshaft part number 3278500-7

has had a number of unserviceable occurrences reported by operators. Similar to the reports described in Boeing

service bulletin 767-78A0097, the unserviceable flexshafts were found to have cores that had become sheared

and unbraided. The manufacturer of the engines, General Electric (GE), and Middle River Aircraft Systems

(MRAS), the supplier of the T/R, have changed the design and supplier of the flexshafts. The flexshaft design

change incorporates a better end fitting attachment, a larger core diameter with the core wound specifically for

use on a left and right T/R half to increase its resistance to damage. The incorporation of this service bulletin is

the recommended alternative to Boeing service bulletin 767-78A0097.

This service bulletin, together with MRAS service bulletin CF6-80C2 S/B 78-1168, gives instructions to replace

the short flexible drive shaft of each T/R half of each engine. Left and right halves of each T/R will have a new

flexshaft installed that is specific to each half.

Boeing Service Related Problem (SRP) 767-SRP-78-0061 is related to this service bulletin.

Boeing Fleet Team Digest (FTD) 767 FTD 78-07001 is related to this service bulletin.

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ACTION (PRR B12901-100S)

Work Package 1 - Prepare the thrust reverser (T/R) and get access the short flexshaft between the

electro-mechanical brake and the upper angle gearbox of each T/R left half. Replace the short flexshaft.

Work Package 2 - Prepare the thrust reverser (T/R) and get access the short flexshaft between the

electro-mechanical brake and the upper angle gearbox of each T/R right half. Replace the short flexshaft.

EFFECTIVITY

767-200/300/300F/400ER Airplanes powered by GE CF6-80C2 engines. Refer to Paragraph 1.A., Effectivity

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 60 months after the original

issue date of this service bulletin.

INDUSTRY SUPPORT INFORMATION

Boeing warranty remedies are not available for the configuration changes given in this service bulletin.

MANPOWER

Refer to Paragraph 1.G., Manpower.

MATERIAL INFORMATION

Operator Supplied Parts/Materials.

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

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BLANK PAGE
Commercial 

Airplanes 767

Service Bulletin

ALERT

Number: 767-78A0100

Original Issue: October 26, 2010

ATA System: 7834

SUBJECT: EXHAUST (GE CF6-80 Series Engines) - Thrust Reverser Control System - Short

Flexible Drive Shaft 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

Refer to Service Bulletin Index Document D624T001 Part 3 for Airplane Variable Number, Line

Number, and Serial Number data.

This service bulletin is for the airplanes shown below. An equivalent change is on subsequent

production airplanes. Refer to PRR B12901-100S for data about this change.

GROUP CONFIGURATION DESCRIPTION

767-200/300/300F/400ER airplanes powered by General Electric

(GE) CF6-80C2 engines

1 -

Airplane Models:

767-200, 767-300, 767-300F, 767-400ER

Variable Number Group

VB331 - VB332 1

VB441 - VB444 1

VE121 - VE126 1

VE141 - VE149 1

VE151 - VE152 1

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Variable Number Group

VF001 - VF002 1

VF041 - VF042 1

VF051 1

VF171 - VF172 1

VF180 - VF184 1

VF251 1

VK012 - VK016 1

VK081 - VK082 1

VK084 - VK113 1

VK131 - VK133 1

VK141 - VK148 1

VK181 1

VK186 1

VL001 - VL006 1

VL701 - VL703 1

VL751 - VL755 1

VL891 - VL900 1

VL911 - VL914 1

VL941 1

VN001 - VN041 1

VN051 - VN064 1

VN081 - VN099 1

VN191 - VN198 1

VN231 - VN234 1

VN291 - VN293 1

VN301 - VN314 1

VN421 - VN427 1

VN436 1

VN471 - VN472 1

VN546 - VN547 1

VN634 - VN638 1

VN651 - VN658 1

VN676 1

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ALERT ALERT
Variable Number Group

VN731 - VN732 1

VN751 - VN753 1

VN791 - VN792 1

VN811 - VN813 1

VN921 - VN922 1

VN951 - VN953 1

VN968 - VN970 1

VQ001 - VQ021 1

VQ071 - VQ086 1

VQ111 1

VR051 - VR060 1

VR081 1

VR084 1

VR086 - VR089 1

VR106 - VR109 1

VR201 - VR211 1

VR251 1

VR256 - VR260 1

VR266 - VR272 1

VR401 1

VR426 1

VR441 1

VR461 1

VS051 - VS056 1

VS073 - VS078 1

VS111 - VS113 1

VS131 - VS133 1

VS136 - VS137 1

VS176 - VS177 1

VS186 - VS187 1

VS196 - VS203 1

VS216 - VS217 1

VS231 1

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BOEING SERVICE BULLETIN 767-78A0100

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Variable Number Group

VS261 - VS263 1

VS266 - VS274 1

VS291 - VS293 1

VS316 1

VS321 - VS324 1

VS331 - VS333 1

VS336 - VS337 1

VS366 - VS367 1

VS381 - VS382 1

VS391 - VS392 1

VS401 1

VS466 - VS472 1

VS486 1

VS526 1

VS546 - VS549 1

VS701 - VS736 1

VS751 - VS759 1

VS861 1

VS891 1

VS901 - VS910 1

VS921 - VS925 1

VS931 - VS933 1

VS941 1

VS951 - VS952 1

VS961 - VS962 1

VT501 1

VT511 - VT513 1

VT521 - VT523 1

VT531 - VT533 1

VT541 - VT543 1

VV001 1

VW701 - VW721 1

VW851 1

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BOEING SERVICE BULLETIN 767-78A0100

ALERT ALERT
2. Spares Affected

Examine your spares supply for the parts or components identified in Paragraph 2.C., Parts

Necessary for Each Airplane. If any parts or components are found, refer to Paragraph 2.C. for

the recommended use.

B. Concurrent Requirements

None.

C. Reason

Accomplishment of this service bulletin will prevent damage and the possible breakage of the short

flexshafts related to the electro-mechanical brake of General Electric (GE) CF6-80C2 engines. Flexshaft

breakage removes the primary level of protection against an uncommanded thrust reverser deployment

occurrence. Uncommanded T/R deployment could result in a loss of control of the airplane.

In 1998 operators first told Boeing of unserviceable short flexible drive shafts (also referred to as

'flexshafts') related to the electro-mechanical brake of the Thrust Reverser Actuation System (TRAS)

on GE CF6-80C2 engines. Boeing released service bulletin 767-78A0097 to replace these short

flexshafts individually when necessary. But since the release of that service bulletin, flexshaft damage

and breakage has continued to occur. The performance of the short flexshaft installed by service bulletin

767-78A0097 did not have the necessary reliability for the system. Since its installation on GE CF6-80C2

engines, short flexshaft part number 3278500-7 has had a number of unserviceable occurrences

reported by operators. Similar to the reports described in Boeing service bulletin 767-78A0097, the

unserviceable flexshafts were found to have cores that had become sheared and unbraided. The

manufacturer of the engines, General Electric (GE), and Middle River Aircraft Systems (MRAS), the

supplier of the T/R, have changed the design and supplier of the flexshafts. The flexshaft design change

incorporates a better end fitting attachment, a larger core diameter with the core wound specifically for

use on a left and right T/R half to increase its resistance to damage. The incorporation of this service

bulletin is the recommended alternative to Boeing service bulletin 767-78A0097.

This service bulletin, together with MRAS service bulletin CF6-80C2 S/B 78-1168, gives instructions

to replace the short flexible drive shaft of each T/R half of each engine. Left and right halves of each

T/R will have a new flexshaft installed that is specific to each half.

Boeing Service Related Problem (SRP) 767-SRP-78-0061 is related to this service bulletin.

Boeing Fleet Team Digest (FTD) 767 FTD 78-07001 is related to this service bulletin.

D. Description

Work Package 1 - Prepare the thrust reverser (T/R) and get access the short flexshaft between the

electro-mechanical brake and the upper angle gearbox of each T/R left half. Replace the short flexshaft.

Work Package 2 - Prepare the thrust reverser (T/R) and get access the short flexshaft between the

electro-mechanical brake and the upper angle gearbox of each T/R right half. Replace the short flexshaft.

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

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BOEING SERVICE BULLETIN 767-78A0100

ALERT ALERT
Affected Maintenance Zones

Model Zone

767-200, 767-300, 767-300F, 415, 416, 425, 426

767-400ER

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 change given in this service bulletin be done within 60 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.

In addition, the Manager of the FAA Seattle Aircraft Certification Office approves the action (i.e. inspection

or modification) defined in this service bulletin as an alternative method of compliance to the requirements

of paragraph (c) of AD 2000-09-04. All provisions of AD 2000-09-04 that are not specifically referenced

in the above statement remain fully applicable and must be complied with.

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 service bulletin for each

engine. 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.

WORK PACKAGE 1

Task Number of Persons Task Hours Elapsed Hours

Open Access 1 0.50 0.50

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WORK PACKAGE 1

Task Number of Persons Task Hours Elapsed Hours

FIGURE 1 (a)

Close Access 1 0.50 0.50

TOTAL FOR EACH T/R LEFT HALF 1.00 1.00

(a) Refer to MRAS service bulletin CF6-80C2 S/B 78-1168.

WORK PACKAGE 2

Task Number of Persons Task Hours Elapsed Hours

Open Access 1 0.50 0.50

FIGURE 2 (a)

Close Access 1 0.50 0.50

TOTAL FOR EACH T/R RIGHT HALF 1.00 1.00

(a) Refer to MRAS service bulletin CF6-80C2 S/B 78-1168.

The time to make the change in accordance with MRAS service bulletin CF6-80C2 S/B 78-1168 is not

included.

Work Package 1 and 2 can be done independently, but preparation and restoration time will be less if

the work packages are done at the same time. Work Package 1 and 2 are necessary for each engine.

H. Weight and Balance Changes

Refer to MRAS service bulletin CF6-80C2 S/B 78-1168.

I. Electrical Load Data

Not changed.

J. References

1. Existing Data

a. Engineering Change Memo PRR B12901-100S.

b. Boeing Fleet Team Digest (FTD) 767 FTD 78-07001.

c. Boeing Service Bulletin 767-78A0097.

d. Boeing Service Related Problem (SRP) 767-SRP-78-0061.

e. Federal Aviation Administration (FAA) Airworthiness Directive 2000-09-04.

f. Middle River Aircraft Systems (MRAS) service bulletin CF6-80C2 S/B 78-1168.

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BOEING SERVICE BULLETIN 767-78A0100

ALERT ALERT
NOTE: The supplier was told to send copies of the service bulletin to each operator.

g. 767-200/300 Aircraft Maintenance Manual (AMM) 78-31-00, 78-31-18, 78-34-07.

h. 767-400 Aircraft Maintenance Manual (AMM) 78-31-00, 78-31-18, 78-34-07.

2. Data supplied with this Service Bulletin

None.

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

None.

K. Publications Affected

1. Publications:

Publication Chapter-Section

767 Illustrated Parts Catalog 78-34

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.

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BOEING SERVICE BULLETIN 767-78A0100

ALERT ALERT
2. MATERIAL INFORMATION

A. Material - Price and Availability

Refer to Middle River Aircraft Systems (MRAS) service bulletin CF6-80C2 S/B 78-1168.

B. Industry Support Information

Boeing warranty remedies are not available for the configuration changes given in this service bulletin.

C. Parts Necessary For Each Airplane

1. Kits/Parts

Refer to MRAS service bulletin CF6-80C2 S/B 78-1168.

2. Parts and Materials Supplied by the Operator

Refer to MRAS service bulletin CF6-80C2 S/B 78-1168.

3. Parts Modified and Reidentified

None.

4. Parts Removed and Not Replaced

None.

D. Parts Necessary to Change Spares

Refer to MRAS service bulletin CF6-80C2 S/B 78-1168.

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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BOEING SERVICE BULLETIN 767-78A0100

ALERT ALERT

BLANK PAGE
3. ACCOMPLISHMENT INSTRUCTIONS

A. GENERAL INFORMATION

CAUTION: KEEP THE WORK AREA, WIRES AND ELECTRICAL BUNDLES CLEAN OF METAL

PARTICLES OR CONTAMINATION WHEN YOU USE TOOLS. UNWANTED MATERIAL,

METAL PARTICLES OR CONTAMINATION CAUGHT IN WIRE BUNDLES CAN CAUSE

DAMAGE TO THE BUNDLES. DAMAGED WIRE BUNDLES CAN CAUSE SPARKS OR

OTHER ELECTRICAL DAMAGE.

NOTE: 1. The instructions identified in Paragraph 3.B., Work Instructions, and the Figure(s)

give the recommended sequence of steps. The sequence of steps to do this service

bulletin can be changed.

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

definition of the acronyms.

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

4. The work instructions are divided into work packages. Task Hours and Elapsed Hours

for each package are given in Paragraph 1.G., Manpower. You can do each work

package independently. Work Package 1 and 2 are necessary for each engine.

5. 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.

6. The instructions in Paragraph 3.B., Work Instructions and the figures can include

operation of tools or test equipment. Boeing Engineering Tool Drawings, the Illustrated

Tool and Equipment Manual, and the Special Tool and Ground Handling Drawing

Index contain data on versions of the tools or test equipment that you can use. It is

permitted to use replaced tools. It is not permitted to use superseded tools.

7. 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.

B. WORK INSTRUCTIONS

WORK PACKAGE 1 - THRUST REVERSER LEFT HALF

1. Deactivate the thrust reverser (T/R) for ground maintenance. Refer to 767-200/300 AMM 78-31-00

or 767-400 AMM 78-31-00 as an accepted procedure.

2. Replace the short flexshaft in accordance with FIGURE 1.

3. Activate the T/R after ground maintenance. Refer to 767-200/300 AMM 78-31-00 or 767-400 AMM

78-31-00 as an accepted procedure.

4. Put the airplane back to a serviceable condition.

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ALERT ALERT
WORK PACKAGE 2 - THRUST REVERSER RIGHT HALF

1. Deactivate the thrust reverser (T/R) for ground maintenance. Refer to 767-200/300 AMM 78-31-00

or 767-400 AMM 78-31-00 as an accepted procedure.

2. Replace the short flexshaft in accordance with FIGURE 2.

3. Activate the T/R after ground maintenance. Refer to 767-200/300 AMM 78-31-00 or 767-400 AMM

78-31-00 as an accepted procedure.

4. Put the airplane back to a serviceable condition.

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BOEING SERVICE BULLETIN 767-78A0100

ALERT ALERT
FIGURE 1: THRUST REVERSER LEFT HALF ELECTRO-MECHANICAL BRAKE - SHORT FLEXSHAFT

REPLACEMENT

(SHEET 1 OF 3)

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BOEING SERVICE BULLETIN 767-78A0100

ALERT ALERT
FIGURE 1: THRUST REVERSER LEFT HALF ELECTRO-MECHANICAL BRAKE - SHORT FLEXSHAFT

REPLACEMENT

(SHEET 2 OF 3)

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BOEING SERVICE BULLETIN 767-78A0100

ALERT ALERT
The step numbers shown below agree with the numbers shown in the circle symbols in the figure. The QTY

numbers shown below are the number of parts necessary for each thrust reverser left half.

STEP TASK NAME IDENTIFICATION QTY MORE DATA

CABLE-FLEXIBLE 3278500-( ) 1 (a)

DRIVE

1 Remove

CABLE-FLEXIBLE 491B1200036-001 1 (a)

DRIVE

2 Install (New)

(a) in accordance with Middle River Aircraft Systems (MRAS) service bulletin CF6-80C2 S/B 78-1168. Also

refer to 767-200/300 AMM 78-31-18 and 767-200/300 AMM 78-34-07 or 767-400 AMM 78-31-18 and

767-400 AMM 78-34-07 for additional information.

FIGURE 1: THRUST REVERSER LEFT HALF ELECTRO-MECHANICAL BRAKE - SHORT FLEXSHAFT

REPLACEMENT

(SHEET 3 OF 3)

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BOEING SERVICE BULLETIN 767-78A0100

ALERT ALERT
FIGURE 2: THRUST REVERSER RIGHT HALF ELECTRO-MECHANICAL BRAKE - SHORT FLEXSHAFT

REPLACEMENT

(SHEET 1 OF 3)

BOEING PROPRIETARY -

Copyright © Unpublished Work - See page 1 for details.

Original Issue: October 26, 2010

767-78A0100

24 of 26

BOEING SERVICE BULLETIN 767-78A0100

ALERT ALERT
The step numbers shown below agree with the numbers shown in the circle symbols in the figure. The QTY

numbers shown below are the number of parts necessary for each thrust reverser right half.

FIGURE 2: THRUST REVERSER RIGHT HALF ELECTRO-MECHANICAL BRAKE - SHORT FLEXSHAFT

REPLACEMENT

(SHEET 2 OF 3)

BOEING PROPRIETARY -

Copyright © Unpublished Work - See page 1 for details.

Original Issue: October 26, 2010

767-78A0100

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BOEING SERVICE BULLETIN 767-78A0100

ALERT ALERT
STEP TASK NAME IDENTIFICATION QTY MORE DATA

CABLE-FLEXIBLE 3278500-( ) 1 (a)

DRIVE

1 Remove

CABLE-FLEXIBLE 491B1200036-002 1 (a)

DRIVE

2 Install (New)

(a) in accordance with Middle River Aircraft Systems (MRAS) service bulletin CF6-80C2 S/B 78-1168. Also

refer to 767-200/300 AMM 78-31-18 and 767-200/300 AMM 78-34-07 or 767-400 AMM 78-31-18 and

767-400 AMM 78-34-07 for additional information.

FIGURE 2: THRUST REVERSER RIGHT HALF ELECTRO-MECHANICAL BRAKE - SHORT FLEXSHAFT

REPLACEMENT

(SHEET 3 OF 3)

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Copyright © Unpublished Work - See page 1 for details.

Original Issue: October 26, 2010

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26 of 26

BOEING SERVICE BULLETIN 767-78A0100

ALERT ALERT