Commercial

Airplane

Group

737

Service Bulletin

Number: 737-35A1058 Revision Transmittal Sheet Date: September 2, 1999

Revision 1: June 1, 2000

ATA System: 3510

SUBJECT: OXYGEN - Crew Oxygen - Crew Oxygen System Low Pressure Flex Hose Replacement

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 initial release of this service bulletin.

REASON FOR REVISION

This revision is sent to advise affected operators of the following:

The Parts Necessary For Each Airplane section has been revised to add the equivalent vendor oxygen hose

part numbers.

The Joint Airworthines Requirements (JAR) statement has been added to the Approval area of the service

bulletin.

The data given in Information Notice 737-35A1058 IN 01 and 02 are included in this revision.

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 Release: September 2, 1999

Revision 1: June 1, 2000

737-35A1058

Revision Transmittal Page 1 of 1

Commercial

Airplane

Group

737

Service Bulletin

Number: 737-35A1058 Summary Date: September 2, 1999

Revision 1: June 1, 2000

ATA System: 3510

SUBJECT: OXYGEN - Crew Oxygen - Crew Oxygen System Low Pressure Flex Hose Replacement

CONCURRENT REQUIREMENTS

None

BACKGROUND

The changes provided in this service bulletin will

help prevent damage to the low pressure oxygen

flex hoses that may be subjected to electrical

current. An electrical grounding condition can cause

the hose to melt or burn from smoke and/or fire.

One operator has reported damaged oxygen supply

hoses on another Boeing model in August of 1997.

This damage has occurred due to a short circuit in

the 757 Audio Select Panel. It sent an electrical

current through the support structure to the flight

crew oxygen mask stowage box. This caused the

spring inside the low pressure oxygen hose to act as

an electrical conductor and heat up. This caused

the hose to burn through.

Also, a similar occurrence on a 737 was reported

due to improper maintenance.

This service bulletin will replace low pressure

oxygen hoses with non-conductive hoses located on

the flight deck. The replacement of the oxygen

hoses will help prevent electrical current from

passing through the spring which can cause the

hose to melt or burn from smoke and/or fire.

Boeing Service Related Problem (SRP)

737-SRP-35-0014 is related to this service bulletin.

ACTION (PRR 38275-1)

Remove the crew oxygen boxes. Replace the

existing low pressure hoses with new

non-conductive hoses. Install the crew oxygen

boxes. Functional test the system.

EFFECTIVITY

All 737-600/-700/-800 airplanes line numbers 1

through 348.

COMPLIANCE

Boeing recommends compliance at the earliest

opportunity when manpower, material and facilities

are available.

INDUSTRY SUPPORT INFORMATION

Boeing warranty remedies are not available for the

configuration changes given in this service bulletin.

MANPOWER

Total Elapsed Time

Man-Hours (Hours)

1.75 1.75

MATERIAL INFORMATION

None

737-35A1058

Summary Page 1 of 2
BOEING SERVICE BULLETIN 737-35A1058

(TYPICAL)

REPLACE OXYGEN BOX HOSES

AS APPLICABLE

S92714

September 2, 1999 737-35A1058

Revision 1: June 1, 2000 Summary Page 2 of 2
Commercial

Airplane

Group

737

Service Bulletin

Number: 737-35A1058

Date: September 2, 1999

Revision 1: June 1, 2000

ATA System: 3510

SUBJECT: OXYGEN - Crew Oxygen - Crew Oxygen System Low Pressure Flex Hose Replacement

THIS SERVICE 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 D6-19567, 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 38275-1 for data about this change.

Airplane Models:

737-600 737-700 737-800

IDENTIFICATION BY CUSTOMER, CUSTOMER CODE, GROUP AND VARIABLE NUMBER

A. S. BUGSHAN AND BROTHERS (BUG)

YG021

AIR BERLIN (BER)

YC051-YC058

AIR CHINA (BEJ)

YC941

AIR EUROPA (ARE)

YC761-YC763

AIR PACIFIC (APC)

YA291 YC931-YC932

ALASKA AIRLINES (ASA)

YA841

September 2, 1999 737-35A1058

Revision 1: June 1, 2000 Page 1 of 21
BOEING SERVICE BULLETIN 737-35A1058

AMERICAN AIRLINES (AAL)

YC801-YC816

AMIRI FLIGHT (ABD)

YG023

ATLAS AIR (TLS)

YG010

AXON AIRLINES (AXO)

YA253-YA254

AZZURRAAIR (AZR)

YA573 YA575

BEL AIR LIMITED (ULL)

YG022

BOEING (TBC)

YG002

BOEING DEMONSTRATOR JET (BCJ)

YG001

BRAATHENS (BRT)

YA311 YA541-YA546

BWIA INTERNATIONAL AIRWAYS (TTA)

YA301

CHARTWELL PARTNERS (CHP)

YG017

CHINA AIRLINES (CHI)

YC571-YC580

CHINA YUNNAN AIRLINES (YUN)

YA811-YA814

CONTINENTAL AIRLINES (CAL)

YA501-YA531 YC321-YC346

COPA AIRLINES (COP)

YA755-YA756

DELTA AIR LINES (DAL)

YC601-YC608

DOBRO LIMITED (DOB)

YG008

DUBAI AIR WING (DAW)

YG007

EASTWIND AIRLINES (ESW)

YA271-YA272

September 2, 1999 737-35A1058

Revision 1: June 1, 2000 2
BOEING SERVICE BULLETIN 737-35A1058

EL AL ISRAEL AIRLINES (ELA)

YA881 YC591-YC593

EURALAIR (ERA)

YC701 YC703-YC704

FUNAIR (FUN)

YG027

GE AIRCRAFT SERVICES (GEB)

YG003 YG012

GERMANIA (GER)

YA231-YA242 YA571-YA572

GOODWATER LIMITED (BCS)

YG018

HAINAN AIRLINES (HNA)

YC126-YC127 YC401 YC404 YC971

HAMBURG INTERNATIONAL AIRLINES (HAU)

YA577

HAPAG-LLOYD FLUG (HAP)

YC001-YC011

ISRAIR (ISA)

YA574 YA576

ISTANBUL AIRLINES (IST)

YC406

JET AIRWAYS (JPL)

YA751-YA754 YC402-YC403 YC731-YC734

KLM - ROYAL DUTCH AIRLINES (KLM)

YC781-YC783

LAPA ARGENTINA (LAZ)

YA302 YA321 YA601 YA607

LAUDA AIR (LAL)

YC381-YC382

MAERSK AIR (MRS)

YA201-YA206

MID EAST JET (SKL)

YG013-YG014

NEWS CORPORATION (NWS)

YG020

NORTH AMERICAN AIRLINES (NNA)

YC121 YC405

September 2, 1999 737-35A1058

Revision 1: June 1, 2000 3
BOEING SERVICE BULLETIN 737-35A1058

NORTH PACIFIC AVIATION (NPA)

YG011

NORTHEAST (DELAWARE) (NDE)

YG005

NOVAIR (NOO)

YC702 YC705-YC706

PEGASUS AIRLINES (PGS)

YC391

PICTON II (UNU)

YG006

PRINCE TALAL BIN ABDUL AZIZ (PTA)

YG015

ROYAL AIR MAROC (RAM)

YA831-YA832 YC301-YC302 YC407-YC408

RYANAIR (RYR)

YC471-YC474

SABRE AIRWAYS (SBE)

YC111-YC112

SAHARA AIRLINES (SAQ)

YA731

SAS (SAS)

YE001-YE015 YE101-YE109

SHAMROCK HOLDINGS (SHI)

YG016

SHANGHAI AIRLINES (SHA)

YA312-YA314

SHENZHEN AIRLINES (SHZ)

YA721-YA722

SOUTHERN AIRCRAFT SERVICES (HUZ)

YG009

SOUTHWEST AIRLINES (SWA)

YA001-YA043

STERLING EUROPEAN AIRLINES (STR)

YC101-YC103 YC751-YC752

SUPERIOR INT'L AVIATION SRVCS. (JFY)

YG028

TRACINDA CORP. (TRD)

YG004

September 2, 1999 737-35A1058

Revision 1: June 1, 2000 4
BOEING SERVICE BULLETIN 737-35A1058

TRANSAERO AIRLINES (TRX)

YA251-YA252

TRANSAVIA AIRLINES (TAV)

YC071-YC076

TUNISAIR (TUN)

YE151-YE153

TURKI BIN NASSER BIN ABDULAZIZ (TKN)

YG029

TURKISH AIRLINES (THY) (THY)

YC501-YC513

VARIG AIRLINES (VAR)

YA602-YA606

XIAMEN AIRLINES (XIA)

YA701-YA704

117 (117)

YG030

IDENTIFICATION BY VARIABLE NUMBER

YA001-YA043 YA201-YA206 YA231-YA242 YA251-YA254 YA271-YA272 YA291

YA301-YA302 YA311-YA314 YA321 YA501-YA531 YA541-YA546 YA571-YA577

YA601-YA607 YA701-YA704 YA721-YA722 YA731 YA751-YA756 YA811-YA814

YA831-YA832 YA841 YA881 YC001-YC011 YC051-YC058 YC071-YC076

YC101-YC103 YC111-YC112 YC121 YC126-YC127 YC301-YC302 YC321-YC346

YC381-YC382 YC391 YC401-YC408 YC471-YC474 YC501-YC513 YC571-YC580

YC591-YC593 YC601-YC608 YC701-YC706 YC731-YC734 YC751-YC752 YC761-YC763

YC781-YC783 YC801-YC816 YC931-YC932 YC941 YC971 YE001-YE015

YE101-YE109 YE151-YE153 YG001-YG018 YG020-YG023 YG027-YG030

2. Spares Affected

None

September 2, 1999 737-35A1058

Revision 1: June 1, 2000 5
BOEING SERVICE BULLETIN 737-35A1058

B. Concurrent Requirements

None

C. Reason

The changes provided in this service bulletin will help prevent damage to the low pressure oxygen

flex hoses that may be subjected to electrical current. An electrical grounding condition can cause

the hose to melt or burn from smoke and/or fire.

One operator has reported damaged oxygen supply hoses on another Boeing model in August of

1997. This damage has occurred due to a short circuit in the 757 Audio Select Panel. It sent an

electrical current through the support structure to the flight crew oxygen mask stowage box. This

caused the spring inside the low pressure oxygen hose to act as an electrical conductor and heat up.

This caused the hose to burn through.

Also, a similar occurrence on a 737 was reported due to improper maintenance.

This service bulletin will replace low pressure oxygen hoses with non-conductive hoses located on

the flight deck. The replacement of the oxygen hoses will help prevent electrical current from passing

through the spring which can cause the hose to melt or burn from smoke and/or fire.

Revision 1 is sent to advise affected operators of the following:

The Parts Necessary For Each Airplane section has been revised to add the equivalent vendor

oxygen hose part numbers.

The Joint Airworthiness Requirements (JAR) statement has been added to the Approval area of the

service bulletin.

A NOTE has been added to the beginning of the Accomplishment Instructions section to clarify which

oxygen hoses are to be replaced.

Boeing Service Related Problem (SRP) 737-SRP-35-0014 is related to this service bulletin.

D. Description

Remove the crew oxygen boxes. Replace the existing low pressure hoses with new non-conductive

hoses. Install the crew oxygen boxes. Functional test the system.

Revision 1 - No more work is necessary on airplanes changed as shown in the initial release of this

service bulletin.

An evaluation form is attached to this service bulletin. Please use this form to tell us what you think

of the quality of this service bulletin.

E. Compliance

Boeing recommends compliance at the earliest opportunity when manpower, material and facilities

are available.

September 2, 1999 737-35A1058

Revision 1: June 1, 2000 6
BOEING SERVICE BULLETIN 737-35A1058

F. Approval

NOTE: Joint Airworthiness Requirements (JAR) compliance status may be found in the Service

Bulletin Index, Section 1.

This service bulletin was examined by the Federal Aviation Administration (FAA). The changes

specified in this service bulletin comply with the applicable Federal Aviation Regulations (FAR) and

are FAA approved. This service bulletin and the FAA approval were based on the airplane in its

original Boeing delivery configuration or as modified by other FAA 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.

September 2, 1999 737-35A1058

Revision 1: June 1, 2000 7
BOEING SERVICE BULLETIN 737-35A1058

G. Manpower

The table below shows an estimate of the man-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

man-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.

Task Number of Persons Man-Hours Elapsed Time (Hours)

Access 1 .50 .50

Replace Hoses 1 .75 .75

Restore 1 .50 .50

TOTAL FOR EACH AIRPLANE 1.75 1.75

H. Weight and Balance Changes

None

I. Electrical Load Data

Not changed

September 2, 1999 737-35A1058

Revision 1: June 1, 2000 8
BOEING SERVICE BULLETIN 737-35A1058

J. References

1. Existing Data:

a. Engineering Change Memo PRR 38275-1

b. Service Related Problem (SRP) 737-SRP-35-0014

c. 737 Maintenance Manual (AMM) Subject 35-00-00, 35-12-00, 35-12-85

2. Data supplied with this service bulletin:

None

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

Drawing Number Title

417A4000 Oxygen Tubing Instl Section 41, 43 Sta

178 - 420

417A4001 Oxygen Tubing Instl - Flight Deck

These drawings were used to prepare this service bulletin. These drawings are not necessary to

make the specified changes, and are not supplied with this service bulletin. These drawings may

not be applicable to all airplane configurations or operators.

K. Publications Changed

Publication Chapter-Section

737 Illustrated Parts Catalog 35-12

L. Interchangeability and Intermixability of Parts

Refer to Paragraph 2.E., Existing Parts Accountability, for interchangeability and intermixability

information.

September 2, 1999 737-35A1058

Revision 1: June 1, 2000 9
BOEING SERVICE BULLETIN 737-35A1058

BLANK PAGE

September 2, 1999 737-35A1058

Revision 1: June 1, 2000 10
BOEING SERVICE BULLETIN 737-35A1058

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 not available for the configuration changes given in this service

bulletin.

C. Parts Necessary For Each Airplane

1. Kits:

None

2. Parts and Materials Supplied by the Operator:

QTY Part Number / Vendor Part Number Name

(a) 60B50059-611 / 38001-611 (b) Hose Assy

(a) 60B50059-614 / 38001-614 (b) Hose Assy

(a) 60B50059-618 / 38001-618 (b) Hose Assy

(a) For hose quantity requirements, see Illustrated Parts Catalog 35-12 for customer

specific configuration.

(b) HydraFlow (V24984)

13259 166th Street

Cerritos, CA 90701-2203 (USA)

D. Parts Necessary to Change Spares

None

September 2, 1999 737-35A1058

Revision 1: June 1, 2000 11
BOEING SERVICE BULLETIN 737-35A1058

E. Existing Parts Accountability

The parts shown below are changed as shown in this service bulletin.

Existing Part Number RUC Name QTY New Part Number PNC RC

10-60174-31 DIS Hose Assy (a) 60B50059-614 S A

10-60174-35 DIS Hose Assy (a) 60B50059-618 S A

60B50059-124 DIS Hose Assy (a) 60B50059-611 S A

(a) For hose quantity requirements, see Illustrated Parts Catalog 35-12 for customer specific

configuration.

RUC Recommended Use Code

DIS - Discard the part.

PNC Part Number Code

S - To get a new part, use this part number in your order.

- This is the part number after the change given in this service bulletin.

- This part is used in production.

RC Replacement Code

A - Do not use the existing part to replace the new or changed part.

F. Special Tooling - Price and Availability

None

G. 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.

September 2, 1999 737-35A1058

Revision 1: June 1, 2000 12
BOEING SERVICE BULLETIN 737-35A1058

3. ACCOMPLISHMENT INSTRUCTIONS

GENERAL NOTES

1. The paragraphs identified with a letter give the general work instructions and the necessary tests.

The instructions identified with numbers on the figures give the recommended sequence of steps.

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

WORK INSTRUCTIONS

CAUTION: OXYGEN SYSTEM COMPONENTS REQUIRE SPECIAL CARE AND HANDLING

PROCEDURES. REVIEW THE SAFETY AND MAINTENANCE PROCESSES

SHOWN IN 737 AMM 35-00-00.

A. Remove the oxygen stowage box as shown in 737 AMM 35-12-85 or operators equivalent

procedure.

B. Remove the existing conductive oxygen hoses as shown in Figure 1, 2, 3, and 4.

NOTE: Ensure the hose assembly elbows and unions do not move during hose replacement.

Orientation of the elbows and unions are essential in maintaining proper clearances with

other structure.

C. Install the applicable new non-conductive oxygen hoses as shown in Figure 1, 2, 3, and 4.

D. Install the oxygen stowage boxes as shown in 737 AMM 35-12-85 or operators equivalent

procedure.

E. Functional test the crew oxygen system as shown in 737 AMM 35-12-00 or operators equivalent

procedure.

F. Put the airplane back to a serviceable condition.

September 2, 1999 737-35A1058

Revision 1: June 1, 2000 13
BOEING SERVICE BULLETIN 737-35A1058

FIGURE TABLE OF CONTENTS

Title Page

FIGURE 1. OXYGEN BOX HOSE TYPICAL LOCATIONS. . . . . . . . . . . . . . . . . . . . . . . . 15

FIGURE 2. CAPTAIN AND FIRST OFFICER'S OXYGEN BOX HOSE

REPLACEMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

FIGURE 3. FIRST OBSERVER'S OXYGEN BOX HOSE REPLACEMENT . . . . . . . . . . . 18

FIGURE 4. SECOND OBSERVER'S OXYGEN BOX HOSE REPLACEMENT . . . . . . . . 20

September 2, 1999 737-35A1058

Revision 1: June 1, 2000 14
BOEING SERVICE BULLETIN 737-35A1058

SEE FIGURE 2

SEE FIGURE 3

(TYPICAL)

SEE FIGURE 4

SEE FIGURE 2

S92715

FIGURE 1. OXYGEN BOX HOSE TYPICAL LOCATIONS

September 2, 1999 SHEET 1 OF 1 737-35A1058

Revision 1: June 1, 2000 15
BOEING SERVICE BULLETIN 737-35A1058

FWD

CAPTAIN'S CONSOLE FIRST OFFICER'S CONSOLE

FWD

1 4

2 3

1 4

2 3

S92716

FIGURE 2. CAPTAIN AND FIRST OFFICER'S OXYGEN BOX HOSE REPLACEMENT

September 2, 1999 SHEET 1 OF 2 737-35A1058

Revision 1: June 1, 2000 16
BOEING SERVICE BULLETIN 737-35A1058

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

STEP TASK NAME REFERENCES QTY NOTES

1 Remove /

Keep

Oxygen Box 737 AMM 35-12-85 2 -

2 Remove /

Discard

Hose Assy 737 AMM 35-12-85 2 Discard the Hose Assy after

recording the part number.

3 Install Hose Assy 737 AMM 35-12-85 2 See Existing Parts

Accountability for applicable

Hose Assy.

4 Install /

Kept

Oxygen Box 737 AMM 35-12-85 2 -

FIGURE 2. CAPTAIN AND FIRST OFFICER'S OXYGEN BOX HOSE REPLACEMENT

September 2, 1999 SHEET 2 OF 2 737-35A1058

Revision 1: June 1, 2000 17
BOEING SERVICE BULLETIN 737-35A1058

FWD

A

1 4

FWD

2 3

SEE A

FLIGHT COMPARTMENT

S92717

FIGURE 3. FIRST OBSERVER'S OXYGEN BOX HOSE REPLACEMENT

September 2, 1999 SHEET 1 OF 2 737-35A1058

Revision 1: June 1, 2000 18
BOEING SERVICE BULLETIN 737-35A1058

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

STEP TASK NAME REFERENCES QTY NOTES

1 Remove /

Keep

Oxygen Box 737 AMM 35-12-85 1 -

2 Remove /

Discard

Hose Assy 737 AMM 35-12-85 1 Discard the Hose Assy after

recording the part number.

3 Install Hose Assy 737 AMM 35-12-85 1 See Existing Parts

Accountability for applicable

Hose Assy.

4 Install /

Kept

Oxygen Box 737 AMM 35-12-85 1 -

FIGURE 3. FIRST OBSERVER'S OXYGEN BOX HOSE REPLACEMENT

September 2, 1999 SHEET 2 OF 2 737-35A1058

Revision 1: June 1, 2000 19
BOEING SERVICE BULLETIN 737-35A1058

FWD

FWD

A

1 4

2 3

SEE A

FLIGHT COMPARTMENT

S92718

FIGURE 4. SECOND OBSERVER'S OXYGEN BOX HOSE REPLACEMENT

September 2, 1999 SHEET 1 OF 2 737-35A1058

Revision 1: June 1, 2000 20
BOEING SERVICE BULLETIN 737-35A1058

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

STEP TASK NAME REFERENCES QTY NOTES

1 Remove /

Keep

Oxygen Box 737 AMM 35-12-85 1 -

2 Remove /

Discard

Hose Assy 737 AMM 35-12-85 1 Discard Hose Assy after

recording the part number.

3 Install Hose Assy 737 AMM 35-12-85 1 See Existing Parts

Accountability for applicable

Hose Assy.

4 Install /

Kept

Oxygen Box 737 AMM 35-12-85 1 -

FIGURE 4. SECOND OBSERVER'S OXYGEN BOX HOSE REPLACEMENT

September 2, 1999 SHEET 2 OF 2 737-35A1058

Revision 1: June 1, 2000 21

Commercial

Airplane

Group

737

Service Bulletin

Number: 737-35A1058 Evaluation Form Date: September 2, 1999

Revision 1: June 1, 2000

ATA System: 3510

Prepared By: Chris Starr

SUBJECT: OXYGEN - Crew Oxygen - Crew Oxygen System Low Pressure Flex Hose Replacement

Use this evaluation form to tell us what you think of the quality of this service bulletin. We will use the data

that you give us to improve the quality of our service bulletins.

NOTE: Please do not use this evaluation form to tell us to make changes to your manuals. To make these

changes, please use a Publication Change Request (PCR) form.

Please give us this data:

(If necessary, please use the other side. Thank you for the time you used to give us your comments.)

OPERATOR: TODAY'S DATE:

PREPARED BY: TITLE:

ORGANIZATION: TELEX CODE:

TELEPHONE NUMBER: BASE:

Please rate the quality of this service bulletin: (good) 4321 (poor)

Please rate the quality of the illustrations: (good) 4321 (poor)

Will you do the change given by this service bulletin? Yes No If not, please explain:

Is this service bulletin easy to understand? Yes No If not, please explain:

Is this service bulletin easy to use? Yes No If not, please explain:

Are the Planning Information, Material Information, and

Accomplishment Instructions accurate? Yes No If not, please explain:

Is the Manpower estimate accurate? Yes No If not, please explain:

Give the completed evaluation form to your Boeing Field Service Representative or send the evaluation form

directly to this address:

Manager

Service Bulletin Engineering

Boeing Commercial Airplane Group

P.O. Box 3707, Mail Stop 2H-37

Seattle, WA 98124-2207