Commercial 

Airplanes 727

Service Bulletin

ALERT

Number: 727-35A0031

Original Issue: July 18, 2013

ATA System: 3511 3512

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

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

CFR 300-774). An export license may be required before it is used for development, production or use by foreign

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

laws.

ECCN: 9E991

BOEING PROPRIETARY, CONFIDENTIAL AND/OR TRADE SECRET

Copyright © 2013 Boeing.

Unpublished Work. All Rights Reserved.

Treatment of this document and its content is governed by contract with Boeing. Rights to use this document

are licensed on a per aircraft basis and such rights may not be transferable. For more information, contact The

Boeing Company.

Boeing, the Boeing signature, the Boeing symbol, 707, 717, 727, 737, 747, 757, 767, 777, 787, Dreamliner,

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Table of Contents

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

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

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

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

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

B. Concurrent Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

C. Reason . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

D. Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

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

F. Approval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

G. Manpower . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

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

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

J. References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

1. Existing Data: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

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

M. Software Accomplishment Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

2. MATERIAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

A. Material - Price and Availability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

B. Industry Support Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

C. Parts Necessary for Each Airplane . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

1. Kits/Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

2. Parts and Materials Supplied by the Operator . . . . . . . . . . . . . . . . . . . . . . . . 19

3. Parts Modified and Reidentified . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

4. Parts Removed and Not Replaced . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

D. Parts Necessary to Change Spares . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

E. Special Tooling - Price and Availability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

F. Special Tooling Necessary to do this Service Bulletin . . . . . . . . . . . . . . . . . . . . . . . 20

3. ACCOMPLISHMENT INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

A. GENERAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

B. WORK INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

FIGURE 1: FLIGHT COMPARTMENT - CAPTAINS OXYGEN HOSE ASSEMBLY - REPLACEMENT . 23

FIGURE 2: FLIGHT COMPARTMENT - FIRST OFFICERS OXYGEN HOSE ASSEMBLY - REPLACEMENT

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

FIGURE 3: FLIGHT COMPARTMENT - FIRST OBSERVERS OXYGEN HOSE ASSEMBLY - REPLACEMENT

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

FIGURE 4: FLIGHT COMPARTMENT - SECOND OBSERVERS OXYGEN HOSE ASSEMBLY -

REPLACEMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

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Commercial 

Airplanes 727

Service Bulletin

ALERT

Summary Number: 727-35A0031

Original Issue: July 18, 2013

ATA System: 3511 3512

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

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. If the changes in this service bulletin are not done, an electrical

grounding condition can result, causing the hose to melt or burn and release smoke and/or fire into the flight

compartment.

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

hoses located in the flight compartment.

Boeing Service Related Problem (SRP) 727-SRP-35-0050 is related to this service bulletin.

Boeing Fleet Team Digest (FTD) 727 FTD 35-12001 is related to this service bulletin.

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

information.

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

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Planning Data Affected Reference

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 Material Yes

Paragraph 2.F., Special Tooling Necessary to

do this Service Bulletin

Special Tooling Required No

ACTION (PRR 24855-RS)

Remove applicable ceiling and sidewall lining panels in the flight compartment as needed to gain access to the

affected low pressure oxygen flex hoses and replace conductive hoses with new non-conductive hoses. Perform

leak detection procedure and functional test the oxygen system. Install removed ceiling and sidewall panels as

needed.

EFFECTIVITY

727, 727-100, -100C, -200, -200F, 727C Airplane(s). Refer to Paragraph 1.A.1., Airplanes, for the list of affected

airplane(s).

COMPLIANCE

The Federal Aviation Administration (FAA) will possibly release an Airworthiness Directive related to this service

bulletin. The Airworthiness Directive will make the compliance tasks and times given in this service bulletin

mandatory.

Boeing recommends that the change given in this service bulletin be done within 36 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.C.2., for parts and materials supplied by the operator.

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BLANK PAGE
Commercial 

Airplanes 727

Service Bulletin

ALERT

Number: 727-35A0031

Original Issue: July 18, 2013

ATA System: 3511 3512

SUBJECT: OXYGEN - Flight Crew Oxygen System - Low Pressure Oxygen Flex Hose 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 24855-RS for data about this change.

This service bulletin is for the airplane(s) shown below.

Refer to Service Bulletin Index D6-9825 Part 3 for Airplane Variable Number, Line Number, and

Serial Number data.

GROUP CONFIGURATION DESCRIPTION

1 - All Airplanes with possible conductive oxygen flex hoses installed

Airplane Models:

727, 727-100, 727-100C, 727-200, 727-200F, 727C

Variable Number Group

E0001 - E0042 1

E0101 - E0140 1

E0201 - E0216 1

E0301 - E0351 1

E0401 - E0423 1

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Variable Number Group

E3001 - E3006 1

E3011 - E3014 1

E3021 - E3040 1

E3059 1

E3061 - E3077 1

E3101 - E3103 1

E3111 - E3118 1

E3141 - E3152 1

E3171 - E3177 1

E3201 - E3206 1

E3221 - E3224 1

E3241 - E3290 1

E3341 - E3350 1

E3401 - E3421 1

E3451 - E3452 1

E3471 - E3474 1

E3501 - E3513 1

E3516 - E3523 1

E3551 - E3553 1

E3571 - E3578 1

E3601 - E3604 1

E3621 - E3622 1

E3651 - E3655 1

E3677 1

E3681 - E3684 1

E3701 - E3704 1

E3751 - E3755 1

E3781 - E3784 1

E5001 - E5011 1

E5031 - E5068 1

E5101 - E5116 1

E5141 - E5143 1

E5161 - E5164 1

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Variable Number Group

E5201 - E5203 1

E5221 - E5245 1

E5251 - E5252 1

E5271 - E5281 1

E5301 - E5306 1

E5351 - E5353 1

E5381 - E5382 1

E5401 - E5424 1

E5426 - E5429 1

E5433 1

E5435 1

E5451 - E5455 1

E5481 - E5483 1

E5501 - E5502 1

QA001 - QA046 1

QA051 - QA099 1

QA101 - QA199 1

QA201 - QA225 1

QA301 - QA349 1

QA351 - QA376 1

QA378 1

QA401 - QA499 1

QA501 - QA537 1

QA551 - QA579 1

QA581 - QA585 1

QA601 - QA688 1

QA701 - QA753 1

QA801 - QA805 1

QA851 - QA899 1

QA901 - QA946 1

QA949 1

QB001 - QB002 1

QB031 - QB049 1

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Variable Number Group

QB051 - QB068 1

QB101 - QB110 1

QB114 - QB119 1

QB121 - QB149 1

QB151 - QB158 1

QB201 - QB220 1

QB301 - QB316 1

QB351 - QB352 1

QB401 - QB407 1

QB451 - QB458 1

QB501 - QB575 1

QB601 - QB629 1

QB651 1

QB701 - QB705 1

QB801 - QB810 1

QB901 - QB904 1

QD001 - QD012 1

QD031 - QD046 1

QD085 - QD088 1

QD101 - QD105 1

QD121 - QD127 1

QD141 - QD149 1

QD161 - QD164 1

QD191 - QD192 1

QD201 - QD239 1

QD281 - QD284 1

QD301 - QD305 1

QD321 - QD330 1

QD351 1

QD401 - QD403 1

QD407 1

QD410 1

QD421 - QD427 1

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Variable Number Group

QD441 - QD453 1

QD471 - QD475 1

QD501 - QD518 1

QD551 - QD558 1

QD571 - QD572 1

QD581 - QD583 1

QD601 - QD607 1

QD621 - QD624 1

QD641 1

QD661 - QD663 1

QD681 - QD685 1

QD691 - QD692 1

QD701 - QD702 1

QD711 - QD717 1

QD741 1

QD761 - QD769 1

QD781 - QD782 1

QD791 1

QD801 - QD804 1

QD821 - QD828 1

QD901 - QD910 1

QD931 - QD932 1

QD951 - QD954 1

QD971 - QD973 1

QD991 - QD992 1

QE001 - QE002 1

QL001 - QL008 1

QL031 - QL032 1

QL081 1

QL501 - QL515 1

2. Spares Affected

Examine your spares supply for the parts identified below. If any parts are found, refer to Paragraph

2.C.1., Kits/Parts for the recommended action.

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Part Number

10-60174-26 or -9

10-60174-25 or -8

10-60174-36

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. If the changes in this service bulletin are not done,

an electrical grounding condition can result, causing the hose to melt or burn and release smoke and/or

fire into the flight compartment.

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

oxygen hoses located in the flight compartment.

Boeing Service Related Problem (SRP) 727-SRP-35-0050 is related to this service bulletin.

Boeing Fleet Team Digest (FTD) 727 FTD 35-12001 is related to this service bulletin.

D. Description

Remove applicable ceiling and sidewall lining panels in the flight compartment as needed to gain access

to the affected low pressure oxygen flex hoses and replace conductive hoses with new non-conductive

hoses. Install removed ceiling and sidewall panels as needed and functional test the oxygen system.

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

Affected Maintenance Zones

Model Zone

727, 727-100, 727-100C, 727- 2-21, 2-22, 2-23

200, 727-200F, 727C

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 36 months after the

original issue date of this service bulletin.

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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 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 2 6.20 3.10

Figure 1 1 1.00 1.00

Figure 2 1 1.00 1.00

Figure 3 1 1.00 1.00

Figure 4 1 1.00 1.00

Test 1 0.55 0.55

Close Access 2 6.00 3.00

TOTAL FOR EACH AIRPLANE 16.75 10.65

H. Weight and Balance Changes

None.

I. Electrical Load Data

Not applicable.

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J. References

1. Existing Data:

a. Engineering Change Memo PRR 24855-RS

b. Service Related Problem (SRP) 727-SRP-35-0050

c. Fleet Team Digest 727 FTD 35-12001

d. 727 Aircraft Maintenance Manual (AMM) 25-10-01, 35-00-00

2. Data Supplied with this Service Bulletin:

None.

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

Drawing Number Title

65-20900 TUBING INSTL - OXYGEN, SECTION 51.

PROD. ILLUST. TUBING INSTL - SECT 41 CAB FLOOR & UPPER

LH. CAB STA. 178-303.9.

65-25419 Sheets 1, 2,

4, 201, and 210.

PROD. ILLUST. TUBING INSTL - UPPER RH. CAB STA. 178-303.9

SECT. 41.

65-25420 Sheets 1, 2,

3, 201, 210, and 211.

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

727 Illustrated Parts Catalog 35-10

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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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 not available for the configuration changes given in this service bulletin.

C. Parts Necessary for Each Airplane

1. Kits/Parts

Inspect the airplane to determine the flight crew oxygen system configuration. Refer to the Table

in 2.C.2., and for each crew member location found determine if a new oxygen flex hose assembly

is required. The total number of hose assemblies 60B50059-640, -641, -639 required to change

one airplane is the sum of the individual locations with hose assemblies requiring replacement.

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

10-60174-26, or 37001-640 Captain

(a), (d), (e), (f)

60B50059-640 or 1 Hose Assembly, (30 inch length)

38001- 640 (c), (g)

10-60174-25,or 37001- 641 1st Officer

(b), (d), (e), (f)

60B50059-641 or 1 Hose Assembly, (24 inch length)

38001- 641 (c), (h)

10-60174-36, 37001-36 (d), 1st Observer

(e), (f)

60B50059-639 or 1 Hose Assembly (36 inch length)

38001- 639 (c), (i)

2nd Observer10-60174-36, 37001-36 (d),

(e), (f)

60B50059-639 or 1 Hose Assembly (36 inch length)

38001- 639 (c), (i)

(a) Existing optional part number 10-60174-9 or 37001- 640.

(b) Existing optional part number 10-60174-8 or 37001-641.

(c) Hydraflow, 1881 W. Malvern Ave., Fullerton, CA., 92833-2403 (USA) , Cage Code 24984, TEL: (714)

773-2600, FAX: (714) 773-6351, email: www.hydraflowusa.com.

(d) This part is not used in production.

(e) Discard the existing part.

(f) You can not use the existing part to replace the new or changed part.

(g) Supplier part number 38001- 640.

(h) Supplier part number 38001- 641.

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BOEING SERVICE BULLETIN 727-35A0031

ALERT ALERT
Part Number / QTY Name Existing Part Number Notes

Specification

(i) Supplier part number 38001- 639.

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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BOEING SERVICE BULLETIN 727-35A0031

ALERT ALERT
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. 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:

– Torque limits to tighten nuts and bolts are in SRM Chapter 51

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. 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.

6. 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.

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. Shaded areas in Figures are to separate the non-critical and non-authoritative

information from the critical and authoritative information.

B. WORK INSTRUCTIONS

CAUTION: OXYGEN SYSTEM COMPONENTS REQUIRE SPECIAL CARE AND HANDLING

PROCEDURES. REVIEW THE SAFETY AND MAINTENANCE PROCEDURES SHOWN

IN 727 AMM 35-00-00.

1. Remove sidewall and ceiling panels as needed to gain access to the applicable oxygen flex hose.

Refer to 727 AMM 25-10-01 as an accepted procedure.

a. For the Captain and First Officer locations, refer to Figures 1 and 2.

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BOEING SERVICE BULLETIN 727-35A0031

ALERT ALERT
b. For the First and Second Observer locations, refer to Figures 3 and 4.

2. Turn off and depressurize the crew oxygen system, refer to 727 AMM 35-00-00 as an accepted

procedure.

3. Remove the existing conductive oxygen hose assemblies in accordance with Figures 1, 2, 3, and

4.

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

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

other structure.

4. Install the applicable new non-conductive oxygen hose assemblies in accordance with Figures 1,

2, 3, and 4.

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

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

other structure.

5. Turn on and pressurize the crew oxygen system, refer to 727 AMM 35-00-00 as an accepted

procedure.

6. Do a leak detection procedure on the new non-conductive oxygen hose and functional test the

flight crew oxygen system, refer to 727 AMM 35-00-00 as an accepted procedure.

7. Install removed sidewall and ceiling panels as applicable, refer to 727 AMM 25-10-01 as an

accepted procedure.

8. Put the airplane back to a serviceable condition.

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BOEING SERVICE BULLETIN 727-35A0031

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 this figure.

FIGURE 1: FLIGHT COMPARTMENT - CAPTAINS OXYGEN HOSE ASSEMBLY - REPLACEMENT

(SHEET 1 OF 2)

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BOEING SERVICE BULLETIN 727-35A0031

ALERT ALERT
Step Task Name Identification Qty More Data

Refer to 727 AMM

35-00-00 as an accepted procedure.

10-60174-26 (10- 1

60174-9 optional)

1 Remove HOSE ASSEMBLY

Refer to 727 AMM

35-00-00 as an accepted procedure.

2 Install (New) HOSE ASSEMBLY 60B50059-640 1

FIGURE 1: FLIGHT COMPARTMENT - CAPTAINS OXYGEN HOSE ASSEMBLY - REPLACEMENT

(SHEET 2 OF 2)

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BOEING SERVICE BULLETIN 727-35A0031

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 this figure.

FIGURE 2: FLIGHT COMPARTMENT - FIRST OFFICERS OXYGEN HOSE ASSEMBLY - REPLACEMENT

(SHEET 1 OF 2)

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727-35A0031

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BOEING SERVICE BULLETIN 727-35A0031

ALERT ALERT
Step Task Name Identification Qty More Data

Refer to 727 AMM

35-00-00 as an accepted procedure.

10-60174-25 (10- 1

60174-8 optional)

1 Remove HOSE ASSEMBLY

Refer to 727 AMM

35-00-00 as an accepted procedure.

2 Install (New) HOSE ASSEMBLY 60B50059-641 1

FIGURE 2: FLIGHT COMPARTMENT - FIRST OFFICERS OXYGEN HOSE ASSEMBLY - REPLACEMENT

(SHEET 2 OF 2)

Export Controlled ECCN: 9E991 - BOEING

PROPRIETARY - Copyright © Unpublished

Work - See page 1 for details.

Original Issue: July 18, 2013

727-35A0031

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BOEING SERVICE BULLETIN 727-35A0031

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 this figure.

FIGURE 3: FLIGHT COMPARTMENT - FIRST OBSERVERS OXYGEN HOSE ASSEMBLY - REPLACEMENT

(SHEET 1 OF 2)

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727-35A0031

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BOEING SERVICE BULLETIN 727-35A0031

ALERT ALERT
Step Task Name Identification Qty More Data

Refer to 727 AMM

35-00-00 as an accepted procedure.

1 Remove HOSE ASSEMBLY 10-60174-36 1

Refer to 727 AMM

35-00-00 as an accepted procedure.

2 Install (New) HOSE ASSEMBLY 60B50059-639 1

FIGURE 3: FLIGHT COMPARTMENT - FIRST OBSERVERS OXYGEN HOSE ASSEMBLY - REPLACEMENT

(SHEET 2 OF 2)

Export Controlled ECCN: 9E991 - BOEING

PROPRIETARY - Copyright © Unpublished

Work - See page 1 for details.

Original Issue: July 18, 2013

727-35A0031

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BOEING SERVICE BULLETIN 727-35A0031

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 this figure.

FIGURE 4: FLIGHT COMPARTMENT - SECOND OBSERVERS OXYGEN HOSE ASSEMBLY - REPLACEMENT

(SHEET 1 OF 2)

Export Controlled ECCN: 9E991 - BOEING

PROPRIETARY - Copyright © Unpublished

Work - See page 1 for details.

Original Issue: July 18, 2013

727-35A0031

29 of 30

BOEING SERVICE BULLETIN 727-35A0031

ALERT ALERT
Step Task Name Identification Qty More Data

Refer to 727 AMM

35-00-00 as an accepted procedure.

1 Remove HOSE ASSEMBLY 10-60174-36 1

Refer to 727 AMM

35-00-00 as an accepted procedure.

2 Install (New) HOSE ASSEMBLY 60B50059-639 1

FIGURE 4: FLIGHT COMPARTMENT - SECOND OBSERVERS OXYGEN HOSE ASSEMBLY - REPLACEMENT

(SHEET 2 OF 2)

Export Controlled ECCN: 9E991 - BOEING

PROPRIETARY - Copyright © Unpublished

Work - See page 1 for details.

Original Issue: July 18, 2013

727-35A0031

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BOEING SERVICE BULLETIN 727-35A0031

ALERT ALERT