Commercial 

Airplanes 757

Service Bulletin

ALERT

Number: 757-27A0145

Original Issue: August 07, 2003

Revision 1: January 20, 2010

ATA System: 2741

SUBJECT: FLIGHT CONTROLS - Horizontal Stabilizer - Horizontal Stabilizer Trim Actuator -

Ballscrew Freeplay Inspection Addition and Lubrication Interval Change

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

CFR 730-774). 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.

ECCN: 9E991

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Copyright © 2003 The Boeing Company

Unpublished Work - All Rights Reserved

Boeing claims copyright in each page of this document only to the extent that the page contains copyrightable

subject matter. Boeing also claims copyright in this document as a compilation and/or collective work.

This document includes proprietary information owned by The Boeing Company and/or one or more third parties.

Treatment of the document and the information it contains is governed by contract with Boeing. For more

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2.0
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BOEING SERVICE BULLETIN 757-27A0145

ALERT ALERT

BLANK PAGE
Table of Contents

Revision Transmittal Sheet ............................................ 5

Summary ...................................................... 7

1. PLANNING INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

A. Effectivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

1. Airplanes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

2. Spares Affected . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

B. Concurrent Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

C. Reason . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

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

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

F. Approval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

G. Manpower . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

H. Weight and Balance Changes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

I. Electrical Load Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

J. References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

1. Existing Data: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

2. Data supplied with this Service Bulletin: . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

3. Installation Drawings Used in the Preparation of this Service Bulletin: . . . . . . . . . . . 19

K. Publications Affected . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

L. Interchangeability and Intermixability of Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

2. MATERIAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

A. Material - Price and Availability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

B. Industry Support Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

C. Parts Necessary For Each Airplane . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

1. Kits/Parts: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

2. Parts and Materials Supplied by the Operator: . . . . . . . . . . . . . . . . . . . . . . . . 21

3. Parts Modified and Reidentified: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

4. Parts Removed and Not Replaced: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

D. Parts Necessary to Change Spares . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

E. Special Tooling - Price and Availability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

F. Special Tooling Necessary to do this Service Bulletin . . . . . . . . . . . . . . . . . . . . . . . 21

3. ACCOMPLISHMENT INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

A. GENERAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

B. WORK INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

FIGURE 1: INSPECTION OF HORIZONTAL STABILIZER BALLSCREW LOAD PATH . . . . . . . . 25

FIGURE 2: HORIZONTAL STABILIZER BALLSCREW AND BALLNUT FREEPLAY CHECK . . . . . 26

FIGURE 3: HORIZONTAL STABILIZER TRIM BALLSCREW ACTUATOR REPLACEMENT . . . . . 27

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BOEING SERVICE BULLETIN 757-27A0145

ALERT ALERT
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BOEING SERVICE BULLETIN 757-27A0145

ALERT ALERT

BLANK PAGE
Commercial 

Airplanes 757

Service Bulletin

ALERT

Revision Transmittal Sheet Number: 757-27A0145

Original Issue: August 07, 2003

Revision 1: January 20, 2010

ATA System: 2741

SUBJECT: FLIGHT CONTROLS - Horizontal Stabilizer - Horizontal Stabilizer Trim Actuator -

Ballscrew Freeplay Inspection Addition and Lubrication Interval Change

This Revision includes all pages of the service bulletin.

COMPLIANCE INFORMATION RELATED TO THIS REVISION

No more work is necessary on airplanes changed as shown in the original issue of this service bulletin. However,

operators must continue with the repeat inspections, lubrication and freeplay checks in accordance with Paragraph

1.E., Compliance.

REASON FOR REVISION

This revision is sent to change the compliance times of the detailed inspection, lubrication and ballnut-to-ballscrew

freeplay check. Instructions on how to accomplish the detailed inspection are replaced by an instruction to do

the detailed inspection in accordance with the Aircraft Maintenance Manual (AMM) and Part 3 is added to the

work instructions to give lubrication instructions. This revision also adds an Airworthiness Directive (AD) statement

and removes all figures as the procedures are now accomplished by the AMM.

These sections are changed:

1. Summary:

– Background: A interim notification of a revision to the Maintenance Planning Document (MPD) statement

is removed.

– Action: The statement is updated to agree with the updated work instructions.

– Compliance: An Airworthiness Directive (AD) statement is added.

– Manpower: The manpower table is removed.

– Illustration: The summary illustration paragraph is updated.

2. Planning Information:

– Paragraph 1.A., Effectivity: A group configuration table is added which splits the effectivity into 3

configurations.

– Paragraph 1.C., Reason: A interim notification of a revision to the Maintenance Planning Document

(MPD) statement is removed.

– Paragraph 1.D., Description: The statement is updated to agree with the updated work instructions and

maintenance zones are added.

– Paragraph 1.E., Compliance: An Airworthiness Directive (AD) statement is added.

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– Paragraph 1.E., Compliance: The compliance times and the repeat intervals for the detailed inspection,

lubrication and freeplay check in Tables 1 and 2 are changed. The corrective action for damaged parts

is added, footnotes (a) and (b) are changed and footnote (c) is deleted.

– Paragraph 1.E., Compliance: The compliance times and the repeat intervals for the detailed inspection,

lubrication and freeplay check in Table 3 are changed. The corrective action for damaged parts is

added, footnotes (a) and (b) are changed and footnotes (c) and (d) are deleted.

– Paragraph 1.G., Manpower: The manpower table is updated.

3. Accomplishment Instructions:

– Paragraph 3.B., Work Instructions: A note is removed from Part 1, Step 1 and the access, cleaning,

lubrication and detailed inspection instructions are replaced by one instruction to do a detailed inspection

in accordance with the AMM.

– Paragraph 3.B., Work Instructions: The access instruction is removed from Part 2 and an AMM task

is added to the instruction to do the stabilizer ballscrew to ballnut freeplay check.

– Paragraph 3.B., Work Instructions: Part 3 is added to give lubrication instructions.

– Figure 1: This Figure is deleted.

– Figure 2: This Figure is deleted.

– Figure 3: This Figure is deleted.

Vertical lines are put on the left edge of each page, except in Paragraph 1.A., Effectivity, to show the location

of important changes.

Pages with no vertical lines have no important changes.

REVISION HISTORY

Original Issue: August 07, 2003

Revision 1: January 20, 2010

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BOEING SERVICE BULLETIN 757-27A0145

ALERT ALERT
Commercial 

Airplanes 757

Service Bulletin

ALERT

Summary Number: 757-27A0145

Original Issue: August 07, 2003

Revision 1: January 20, 2010

ATA System: 2741

SUBJECT: FLIGHT CONTROLS - Horizontal Stabilizer - Horizontal Stabilizer Trim Actuator -

Ballscrew Freeplay Inspection Addition and Lubrication Interval Change

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 is being issued to provide a new stabilizer ballscrew lubrication interval and detailed inspection

interval. Also, a new stabilizer ballscrew to ballnut freeplay check is included with a recommended check interval.

The inspections/check are an added level of protection which reduces the potential of unlikely failure modes of

the stabilizer ballscrew assembly used on the stabilizer actuator. The inspections/check can be run in-situ on

the airplane.

After an MD-80 horizontal stabilizer jackscrew incident, a design review was initiated of the Boeing heritage

horizontal stabilizer ballscrews. During this review, an operator reported a 757 horizontal stabilizer ballscrew

with extensive corrosion. An investigation was initiated. This investigation identified that a maintenance procedure

to check the stabilizer ballscrew primary load path was required. Loss of the horizontal stabilizer ballscrew

primary and secondary load paths, although extremely improbable, could potentially result in the loss of control

of the airplane.

Boeing Service Related Problem (SRP) 757-SRP-27-0153 is related to this service bulletin.

NOTE: Service Bulletin 757-27-0138 served as an interim maintenance action related to 757-SRP-27-0153.

Service Bulletin 757-27A0145 is the final maintenance recommendation related to 757-SRP-27-0153.

Upon release of Service Bulletin 757-27A0145, operators should perform the maintenance actions in

that bulletin rather than those in Service Bulletin 757-27-0138. However, it should be noted that Service

Bulletin 757-27-0138 includes one maintenance action that is not included in Service Bulletin

757-27A0145: lubrication of the stabilizer pivot hinges. Lubrication of the stabilizer pivot hinges was

included in Service Bulletin 757-27-0138 as a convenience; it is unrelated to the safety issue addressed

in safety 757-SRP-27-0153. Boeing recommends that operators continue to perform the stabilizer hinge

lubrication task per 757 MPD Volume 1 Section 5, and 757 AMM 12-21-05.

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ACTION

Get access to the horizontal stabilizer trim ballscrew actuator and do the procedures that follow below at the

intervals shown in Paragraph 1.E., Compliance:

– Do a detailed inspection of the stabilizer ballscrew assembly.

– Lubricate the horizontal stabilizer trim control system.

– Do a stabilizer ballscrew to ballnut freeplay check.

– Replace damaged and/or cracked and/or worn stabilizer trim ballscrew actuators.

EFFECTIVITY

All 757-300 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.

Refer to Paragraph 1.E., Compliance.

INDUSTRY SUPPORT INFORMATION

Boeing warranty remedies are not available for the tasks 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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BOEING SERVICE BULLETIN 757-27A0145

ALERT ALERT
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BOEING SERVICE BULLETIN 757-27A0145

ALERT ALERT
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BOEING SERVICE BULLETIN 757-27A0145

ALERT ALERT

BLANK PAGE
Commercial 

Airplanes 757

Service Bulletin

ALERT

Number: 757-27A0145

Original Issue: August 07, 2003

Revision 1: January 20, 2010

ATA System: 2741

SUBJECT: FLIGHT CONTROLS - Horizontal Stabilizer - Horizontal Stabilizer Trim Actuator -

Ballscrew Freeplay Inspection Addition and Lubrication Interval Change

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 D624N001 Part 3 for Airplane Variable Number, Line

Number, and Serial Number data.

This service bulletin is for the airplanes shown below.

GROUP CONFIGURATION DESCRIPTION

1 - All 757-300 airplanes.

Airplanes that have not done an overhaul of the stabilizer trim actuator

in accordance with Service Bulletin 757-27A0143 and have less than

or equal to 15,000 total flight hours.

1

Airplanes that have not done an overhaul of the stabilizer trim actuator

in accordance with Service Bulletin 757-27A0143 and have more

than 15,000 total flight hours.

2

Airplanes that have done an overhaul of the stabilizer trim actuator

in accordance with Service Bulletin 757-27A0143.

3

Airplane Models:

757-300

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Variable Number Group

NL001 - NL002 1

NL006 - NL017 1

NL101 - NL109 1

NL141 1

NL601 - NL616 1

NU701 - NU705 1

NU721 - NU728 1

NU731 - NU732 1

2. Spares Affected

None.

B. Concurrent Requirements

None.

C. Reason

This service bulletin is being issued to provide a new stabilizer ballscrew lubrication interval and detailed

inspection interval. Also, a new stabilizer ballscrew to ballnut freeplay check is included with a

recommended check interval. The inspections/check are an added level of protection which reduces

the potential of unlikely failure modes of the stabilizer ballscrew assembly used on the stabilizer actuator.

The inspections/check can be run in-situ on the airplane.

After an MD-80 horizontal stabilizer jackscrew incident, a design review was initiated of the Boeing

heritage horizontal stabilizer ballscrews. During this review, an operator reported a 757 horizontal

stabilizer ballscrew with extensive corrosion. An investigation was initiated. This investigation identified

that a maintenance procedure to check the stabilizer ballscrew primary load path was required. Loss

of the horizontal stabilizer ballscrew primary and secondary load paths, although extremely improbable,

could potentially result in the loss of control of the airplane.

Boeing Service Related Problem (SRP) 757-SRP-27-0153 is related to this service bulletin.

NOTE: Service Bulletin 757-27-0138 served as an interim maintenance action related to

757-SRP-27-0153. Service Bulletin 757-27A0145 is the final maintenance recommendation

related to 757-SRP-27-0153. Upon release of Service Bulletin 757-27A0145, operators should

perform the maintenance actions in that bulletin rather than those in Service Bulletin

757-27-0138. However, it should be noted that Service Bulletin 757-27-0138 includes one

maintenance action that is not included in Service Bulletin 757-27A0145: lubrication of the

stabilizer pivot hinges. Lubrication of the stabilizer pivot hinges was included in Service Bulletin

757-27-0138 as a convenience; it is unrelated to the safety issue addressed in safety

757-SRP-27-0153. Boeing recommends that operators continue to perform the stabilizer hinge

lubrication task per 757 MPD Volume 1 Section 5, and 757 AMM 12-21-05.

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BOEING SERVICE BULLETIN 757-27A0145

ALERT ALERT
Revision 1 is sent to change the compliance times of the detailed inspection, lubrication and

ballnut-to-ballscrew freeplay check. Instructions on how to accomplish the detailed inspection are

replaced by an instruction to do the detailed inspection in accordance with the Aircraft Maintenance

Manual (AMM) and Part 3 is added to the work instructions to give lubrication instructions. Revision 1

also adds an Airworthiness Directive (AD) statement and removes all figures as the procedures are

now accomplished by the AMM.

These sections were changed:

1. Summary:

– Background: A interim notification of a revision to the Maintenance Planning Document (MPD)

statement is removed.

– Action: The statement is updated to agree with the updated work instructions.

– Compliance: An Airworthiness Directive (AD) statement is added.

– Manpower: The manpower table is removed.

– Illustration: The summary illustration paragraph is updated.

2. Planning Information:

– Paragraph 1.A., Effectivity: A group configuration table is added which splits the effectivity

into 3 configurations.

– Paragraph 1.C., Reason: A interim notification of a revision to the Maintenance Planning

Document (MPD) statement is removed.

– Paragraph 1.D., Description: The statement is updated to agree with the updated work

instructions and maintenance zones are added.

– Paragraph 1.E., Compliance: An Airworthiness Directive (AD) statement is added.

– Paragraph 1.E., Compliance: The compliance times and the repeat intervals for the detailed

inspection, lubrication and freeplay check in Tables 1 and 2 are changed. The corrective action

for damaged parts is added, footnotes (a) and (b) are changed and footnote (c) is deleted.

– Paragraph 1.E., Compliance: The compliance times and the repeat intervals for the detailed

inspection, lubrication and freeplay check in Table 3 are changed. The corrective action for

damaged parts is added, footnotes (a) and (b) are changed and footnotes (c) and (d) are

deleted.

– Paragraph 1.G., Manpower: The manpower table is updated.

3. Accomplishment Instructions:

– Paragraph 3.B., Work Instructions: A note is removed from Part 1, Step 1 and the access,

cleaning, lubrication and detailed inspection instructions are replaced by one instruction to do

a detailed inspection in accordance with the AMM.

– Paragraph 3.B., Work Instructions: The access instruction is removed from Part 2 and an

AMM task is added to the instruction to do the stabilizer ballscrew to ballnut freeplay check.

– Paragraph 3.B., Work Instructions: Part 3 is added to give lubrication instructions.

– Figure 1: This Figure is deleted.

– Figure 2: This Figure is deleted.

– Figure 3: This Figure is deleted.

D. Description

Get access to the horizontal stabilizer trim ballscrew actuator and do the procedures that follow below

at the intervals shown in Paragraph 1.E., Compliance:

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BOEING SERVICE BULLETIN 757-27A0145

ALERT ALERT
– Do a detailed inspection of the stabilizer ballscrew assembly.

– Lubricate the horizontal stabilizer trim control system.

– Do a stabilizer ballscrew to ballnut freeplay check.

– Replace damaged and/or cracked and/or worn stabilizer trim ballscrew actuators.

Revision 1 - No more work is necessary on airplanes changed in accordance with the original issue of

this service bulletin. However, operators must continue with the repeat inspections, lubrication and

freeplay checks in accordance with Paragraph 1.E., Compliance.

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

Affected Maintenance Zones

Model Zone

757-300 311, 312

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.

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BOEING SERVICE BULLETIN 757-27A0145

ALERT ALERT
Group 1, Configuration 1:

Table 1 : All airplanes that have not done the overhaul of the stabilizer trim actuator in accordance with

Service Bulletin 757-27A0143 and have completed less than or equal to 15,000 flight hours.

Repeat Interval (Not to Exceed, Whichever Occurs

First)

Compliance Time (Whichever Occurs First)Condition Action

3,500 flight 2 years.

hours.

Within 2 years

from the last

detailed inspection.

Within 3,500

flight hours

from the last

detailed inspection.

Detailed inspection of

the stabilizer ballscrew

assembly in accordance with Paragraph

3.B., Work Instructions,

Part 1.

All airplanes that have

not done the overhaul

of the stabilizer trim actuator in accordance

with Service Bulletin

757-27A0143 and have

completed less than or

equal to 15,000 flight

hours.

2,000 flight 1 year.

hours.

Within 1 year

from the last

lubrication.

Within 2,000

flight hours

from the last

lubrication.

Lubricate the horizontal

stabilizer trim control

system in accordance

with Paragraph 3.B.,

Work Instructions, Part

3. (a)

18,000 flight 5 years.

hours.

If the Airplane will complete

15,000 total flight hours within

18 months from the date on

Revision 1 of this service bulletin, do the freeplay check

within 18 months.

Stabilizer ballscrew to

ballnut freeplay check

in accordance with

Paragraph 3.B., Work

Instructions, Part 2. (b)

If the Airplane completes less

than 15,000 total flight hours

within 18 months from the date

on Revision 1 of this service

bulletin, do the freeplay check

within 15,000 total flight hours

or 5 years, whichever occurs

first.

Replace the stabilizer Before further flight. -

trim ballscrew actuator.

Damage and/or cracks

and/or excessive wear

found on the stabilizer

trim ballscrew actuator.

(a) Lubrication is accomplished as a part of either the detailed inspection or the freeplay check.

(b) If the detailed inspection and the freeplay check are to be accomplished at the same time, do the detailed

inspection before the freeplay check.

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BOEING SERVICE BULLETIN 757-27A0145

ALERT ALERT
Group 1, Configuration 2:

Table 2 : All airplanes that have not done the overhaul of the stabilizer trim actuator in accordance with

Service Bulletin 757-27A0143 and have completed more than 15,000 flight hours.

Repeat Interval (Not to Exceed, Whichever Occurs

First)

Compliance Time (Whichever Occurs First)Condition Action

3,500 flight 2 years.

hours.

Within 18

months from

the last detailed inspection.

Within 3,500

flight hours

from the last

detailed inspection.

Detailed inspection of

the stabilizer ballscrew

assembly in accordance with Paragraph

3.B., Work Instructions,

Part 1.

All airplanes that have

not done the overhaul

of the stabilizer trim actuator in accordance

with Service Bulletin

757-27A0143 and have

completed more than

15,000 flight hours. 2,000 flight 1 year.

hours.

Within 1 year

from the last

lubrication.

Within 2,000

flight hours

from the last

lubrication.

Lubricate the stabilizer

trim control system in

accordance with Paragraph 3.B., Work Instructions, Part 3. (a)

18,000 flight 5 years.

hours.

Within 18

months after

the date on

Revision 1 of

this service

bulletin.

Stabilizer ballscrew to -

ballnut freeplay check

in accordance with

Paragraph 3.B., Work

Instructions, Part 2. (b)

Replace the stabilizer Before further flight. -

trim ballscrew actuator.

Damage and/or cracks

and/or excessive wear

found on the stabilizer

trim ballscrew actuator.

(a) Lubrication is accomplished as a part of either the detailed inspection or the freeplay check.

(b) If the detailed inspection and the freeplay check are to be accomplished at the same time, do the detailed

inspection before the freeplay check.

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Group 1, Configuration 3:

Table 3: All airplanes that have done the overhaul of the stabilizer trim actuator in accordance with

Service Bulletin 757-27A0143.

Repeat Interval (Not to Exceed, Whichever Occurs

First)

Compliance Time (Whichever Occurs First)Condition Action

3,500 flight 2 years.

hours.

Within 2 years

from the last

detailed inspection.

Within 3,500

flight hours

from the last

detailed inspection.

Detailed inspection of

the stabilizer ballscrew

assembly in accordance with Paragraph

3.B., Work Instructions,

Part 1.

All airplanes that have

done the overhaul of

the stabilizer trim actuator in accordance with

Service Bulletin 757-

27A0143.

2,000 flight 1 year.

hours.

Within 1 year

from the last

lubrication.

Within 2,000

flight hours

from the last

lubrication.

Lubricate the horizontal

stabilizer trim control

system in accordance

with Paragraph 3.B.,

Work Instructions, Part

3. (a)

18,000 flight 5 years.

hours.

If the Airplane will complete

15,000 total flight hours since

overhaul within 18 months from

the date on Revision 1 of this

service bulletin, do the freeplay

check within 18 months.

Stabilizer ballscrew to

ballnut freeplay check

in accordance with

Paragraph 3.B., Work

Instructions, Part 2. (b)

If the Airplane completes less

than 15,000 total flight hours

since overhaul within 18

months from the date on Revision 1 of this service bulletin,

do the freeplay check within

15,000 toal flight hours or 5

years, whichever occurs first.

Replace the stabilizer Before further flight. -

trim ballscrew actuator.

Damage and/or cracks

and/or excessive wear

found on the stabilizer

trim ballscrew actuator.

(a) Lubrication is accomplished as a part of either the detailed inspection or the freeplay check.

(b) If the detailed inspection and the freeplay check are to be accomplished at the same time, do the detailed

inspection before the freeplay check.

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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.

G. Manpower

The table below shows an estimate of the task hours necessary to do the detailed inspection, lubrication

and freeplay check 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 examine the work

— Time to cure the materials

— Time to make the parts

— Time to find the tools.

Number of Per- Task-Hours Elapsed Hours

sons

Task

Part 1 - Detailed Inspec- 2 4.00 2.00

tion

Part 2 - Freeplay Check 2 6.00 3.00

Part 3 - Lubrication 2 3.00 1.50

TOTAL FOR EACH AIRPLANE (a) (a)

(a) The total task-hours and elapsed hours are not given as the Parts accomplished

at the same time are variable.

H. Weight and Balance Changes

None.

I. Electrical Load Data

Not changed.

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BOEING SERVICE BULLETIN 757-27A0145

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J. References

1. Existing Data:

a. Boeing Service Bulletin 757-27-0138, 757-27A0143

b. Boeing Service Related Problem (SRP) 757-SRP-27-0153

c. 757 Aircraft Maintenance Manual (AMM) 12-21-05, 27-41-10

d. 757 Maintenance Planning Data (MPD) 757 MPD Volume 1 Section 5

2. Data supplied with this Service Bulletin:

None.

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

None.

K. Publications Affected

Publication Chapter-Section

757 Aircraft Maintenance Manual 27-41

L. Interchangeability and Intermixability of Parts

Accomplishment of this service bulletin does not affect interchangeability or intermixability of parts.

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BLANK PAGE
2. MATERIAL INFORMATION

A. Material - Price and Availability

None.

B. Industry Support Information

Boeing warranty remedies are not available for the inspections/check given in this service bulletin.

C. Parts Necessary For Each Airplane

1. Kits/Parts:

None.

2. Parts and Materials Supplied by the Operator:

None.

3. Parts Modified and Reidentified:

None.

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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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. 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

5. A Detailed Inspection is defined as: An intensive examination of a specific item,

installation, or assembly to detect damage, failure, or irregularity. Available lighting

is normally supplemented with a direct source of good lighting at an intensity deemed

appropriate. Inspection aids such as mirrors, magnifying lenses, etc. may be

necessary. Surface cleaning and elaborate procedures may be required.

6. 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.

B. WORK INSTRUCTIONS

PART 1 : Stabilizer Ballscrew Assembly Detailed Inspection:

1. Do a detailed inspection of the stabilizer ballscrew assembly in accordance with 757 AMM 27-41-10.

2. Put the airplane back to a serviceable condition.

PART 2 : Stabilizer Ballscrew to Ballnut Freeplay Check:

1. Do a stabilizer ballscrew to ballnut freeplay check in accordance with 757 AMM 27-41-10.

2. Put the airplane back to a serviceable condition.

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Part 3: Horizontal Stabilizer Trim Control System Lubrication:

1. Lubricate the horizontal stabilizer trim control system in accordance with 757 AMM 12-21-05.

2. Put the airplane back to a serviceable condition.

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FIGURE 1: INSPECTION OF HORIZONTAL STABILIZER BALLSCREW LOAD PATH

(SHEET 1 OF 1)

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FIGURE 2: HORIZONTAL STABILIZER BALLSCREW AND BALLNUT FREEPLAY CHECK

(SHEET 1 OF 1)

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FIGURE 3: HORIZONTAL STABILIZER TRIM BALLSCREW ACTUATOR REPLACEMENT

(SHEET 1 OF 1)

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