Commercial 

Airplanes 747

Service Bulletin

ALERT

Number: 747-35A2126

Original Issue: October 08, 2009

Revision 1: September 29, 2011

ATA System: 3511

SUBJECT: OXYGEN - Crew Oxygen System - Crew Oxygen Mask Stowage Box Unit -

Inspect/Replace

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 © 2009 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Unpublished Work - All Rights Reserved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.

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BOEING SERVICE BULLETIN 747-35A2126

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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

E. Compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

F. Approval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

G. Manpower . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

H. Weight and Balance Changes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

I. Electrical Load Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

J. References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

1. Existing Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

2. Data supplied with this Service Bulletin . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

3. Installation Drawings Used in the Preparation of this Service Bulletin . . . . . . . . . . . . 15

K. Publications Affected . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

L. Interchangeability and Intermixability of Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

4. Parts Removed and Not Replaced . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

D. Parts Necessary to Change Spares . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

E. Special Tooling - Price and Availability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

F. Special Tooling Necessary to do this Service Bulletin . . . . . . . . . . . . . . . . . . . . . . . 19

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

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

B. WORK INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

FIGURE 1: FLIGHT COMPARTMENT - CREW OXYGEN MASK STOWAGE BOX UNIT - INSPECTION

[Group 1] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

FIGURE 2: FLIGHT COMPARTMENT - CREW OXYGEN MASK STOWAGE BOX UNIT - INSPECTION

[Group 2] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

FIGURE 3: FLIGHT COMPARTMENT - CREW OXYGEN MASK STOWAGE BOX UNIT - REPLACEMENT

[Group 1] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

FIGURE 4: FLIGHT COMPARTMENT - CREW OXYGEN MASK STOWAGE BOX UNIT - REPLACEMENT

[Group 2] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

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BOEING SERVICE BULLETIN 747-35A2126

ALERT ALERT

BLANK PAGE
Commercial 

Airplanes 747

Service Bulletin

ALERT

Revision Transmittal Sheet Number: 747-35A2126

Original Issue: October 08, 2009

Revision 1: September 29, 2011

ATA System: 3511

SUBJECT: OXYGEN - Crew Oxygen System - Crew Oxygen Mask Stowage Box Unit -

Inspect/Replace

This revision includes all pages of the service bulletin.

COMPLIANCE INFORMATION RELATED TO THIS REVISION

More work is necessary on airplanes inspected in accordance with the original issue of this service bulletin that

did not have affected serial numbers. Verify maintenance inspection records or re-inspect the crew oxygen mask

stowage box units in accordance with Zodiac Services (Intertechnique) Service Bulletin MXP1/4-35-175 R02.

More work is necessary on the airplanes inspected in accordance with the original issue of this service bulletin

that have changed crew oxygen mask stowage box units. Re-inspect in accordance with Zodiac

Services(Intertechnique) Service Bulletin MXP1/4-35-175 R02.

REASON FOR REVISION

Revision 1 is sent to perform a General Visual Inspection for affected serial numbers in accordance with revision

02 of Zodiac Services (Intertechnique) Service Bulletin MXP1/4-35-175 and change the serial number of inspected

crew oxygen mask stowage box units.

This revision is set to make the changes below:

1. Replaced references to Intertechnique (Avox-Eros Services, INC) Service Bulletin MXP1/4-35-175, Rev 0

with reference to Zodiac Services (Intertechnique) Service Bulletin MXP1/4-35-175, Rev 02.

2. Summary:

– Compliance: Added FAA Notice of Proposed Rule Making 2010-NM-094-AD.

– Industry Support Information: Included reference to Zodiac Services (Intertechnique) Service

BulletinMXP1/4-35-175, Rev 02.

3. Part 1. B., Concurrent Requirements: Updated to show current supplier service bulletin, MXP1/4-35-175

as Revision 02.

4. Part 1. C., Reason: Added identification of the reason for revision 1.

5. Part 1. D., Description: Added information that additional work is needed for airplanes that have accomplished

the original issue of this service bulletin.

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6. Part 1. E., Compliance: Added FAA Notice of Proposed Rule Making 2010-NM-094-AD.

7. Part 1. J., References: Updated the revision level of the supplier service bulletin and added FAA Notice of

Proposed Rule Making 2010-NM-094-AD.

8. Part 2. C. 2., Material Information, Parts and Materials Supplied by the Operator, (Group 1 and 2): Deleted

P-412 Teflon tape.

9. Part 3. Accomplishment Instructions, B., Work Instructions:

– Step 2, All Groups, Part (a.), changed "Go to step 7" to "Go to step 11" and added steps for Group 1

and 2 airplanes.

– Added Step 3, Close the valve on the crew oxygen cylinder.

– Changed Step 8 and 9 so the install Lock wire on the shutoff valve step comes before closure of the

access to the crew oxygen cylinders.

– Step 10, All Groups, Added "If not previously accomplished".

10. Figures 1-2, changed footnotes (b) and (c).

11. Figures 3-4, added footnote (c).

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: October 08, 2009

Revision 1: September 29, 2011

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BOEING SERVICE BULLETIN 747-35A2126

ALERT ALERT
Commercial 

Airplanes 747

Service Bulletin

ALERT

Summary Number: 747-35A2126

Original Issue: October 08, 2009

Revision 1: September 29, 2011

ATA System: 3511

SUBJECT: OXYGEN - Crew Oxygen System - Crew Oxygen Mask Stowage Box Unit -

Inspect/Replace

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

Refer to Paragraph 1.B., Concurrent Requirements.

BACKGROUND

Boeing has been notified by the supplier that a limited quantity of crew oxygen mask stowage box units, part

number MXP147-3 and MXP402, manufactured between 12 July 2007 and 20 November 2007, were possibly

delivered with a burr in the inlet fitting. This burr may break loose during test or operation and may pose an

ignition source or cause an inlet valve to jam restricting the flow of oxygen. If this service bulletin is not

accomplished, a burr may break loose during test or operation and pose an ignition source or cause an inlet

valve to jam, restricting the flow of oxygen.

Boeing Service Related Problem (SRP) 747-SRP-35-0044 is related to this service bulletin.

ACTION

Perform a General Visual Inspection of the crew oxygen mask stowage box units. The crew oxygen mask

stowage box units do not need to be fully removed to do the inspection. Loosen the four quarter turn fasteners

and lift the crew oxygen mask stowage box unit enough to read the serial number. Perform a General Visual

Inspection for affected serial numbers identified in the Zodiac Services (Intertechnique) service bulletin,

MXP1/4-35-175 Rev 02.

Crew oxygen mask stowage box units that do not have affected serial numbers require no further action. Stow

the crew oxygen mask stowage box unit. Tighten the four quarter turn fasteners.

Crew oxygen mask stowage box units that have affected serial numbers are to be replaced. Perform functional

testing on all replaced crew oxygen mask stowage box units.

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7 of 32
Crew oxygen mask stowage box units that have been inspected in accordance with the original issue of this

service bulletin that did not have affected serial numbers require verification of maintenance records inspection

or re-inspection of the crew oxygen mask stowage box unit in accordance with Zodiac Services

(Intertechnique)service bulletin MXP1/4-35-175 R02.

EFFECTIVITY

747-400F Airplanes. Refer to Paragraph 1.A.1., Airplanes for the list of affected airplanes.

COMPLIANCE

Federal Aviation Administration (FAA) Notice of Proposed Rule Making 2010-NM-094-AD, is related to this

service bulletin.

Boeing recommends that the inspection and any applicable replacement given in this service bulletin be done

within 24 months after the original issue date of this service bulletin.

INDUSTRY SUPPORT INFORMATION

Boeing warranty remedies are not available for the operator action(s) given in this service bulletin. Please refer

to Zodiac Services (Intertechnique), Service Bulletin MXP1/4-35-175, Rev 02 for more information.

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 747-35A2126

ALERT ALERT

BLANK PAGE
Commercial 

Airplanes 747

Service Bulletin

ALERT

Number: 747-35A2126

Original Issue: October 08, 2009

Revision 1: September 29, 2011

ATA System: 3511

SUBJECT: OXYGEN - Crew Oxygen System - Crew Oxygen Mask Stowage Box Unit -

Inspect/Replace

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 airplanes shown below.

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

Number, and Serial Number data.

GROUP CONFIGURATION DESCRIPTION

1 - 747-400 Airplanes - Part number MXP147-3

2 - 747-400 Airplanes - Part number MXP402

Airplane Models:

747-400F

Variable Number Group

RL476 2

RL516 2

RL534 1

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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

The service bulletin listed below must be done before or at the same time as this service bulletin:

Company Service Bulletin Description

Provides inspection information and list of

affected serial numbers.

Zodiac Services MXP1/4-35-175, Rev. 02

(Intertechnique)

C. Reason

Boeing has been notified by the supplier that a limited quantity of crew oxygen mask stowage box units,

part number MXP147-3 and MXP402 manufactured between 12 July 2007 and 20 November 2007,

were possibly delivered with a burr in the inlet fitting. This burr may break loose during test or operation

and may pose an ignition source or cause an inlet valve to jam restricting the flow of oxygen. If this

service bulletin is not accomplished, a burr may break loose during test or operation and pose an

ignition source or cause an inlet valve to jam, restricting the flow of oxygen.

Boeing Service Related Problem (SRP) 747-SRP-35-0044 is related to this service bulletin.

Revision 1 is sent to add a crew oxygen mask stowage box unit inspection in accordance with revision

02 of Zodiac Services (Intertechnique) Service Bulletin MXP1/4-35-175.

D. Description

Perform a General Visual Inspection of the crew oxygen mask stowage box units. The crew oxygen

mask stowage box units do not need to be fully removed to do the inspection. Loosen the four quarter

turn fasteners and lift the crew oxygen mask stowage box unit enough to read the serial number.

Perform a General Visual Inspection for affected serial numbers identified in the Zodiac Services

(Intertechnique) service bulletin, MXP1/4-35-175 Rev 02.

Crew oxygen mask stowage box units that do not have affected serial numbers require no further

action. Stow the crew oxygen mask stowage box unit. Tighten the four quarter turn fasteners.

Crew oxygen mask stowage box units that have affected serial numbers are to be replaced. Perform

functional testing on all replaced crew oxygen mask stowage box units.

More work is necessary on airplanes changed in accordance with the original issue of this service

bulletin to inspect the crew oxygen mask stowage box unit in accordance with revision 02 of Zodiac

Services (Intertechnique) Service Bulletin MXP1/4-35-175.

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

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BOEING SERVICE BULLETIN 747-35A2126

ALERT ALERT
Affected Maintenance Zones

Model Zone

747-400F 211, 212

E. Compliance

Federal Aviation Administration (FAA) Notice of Proposed Rule Making 2010-NM-094-AD, is related

to this service bulletin.

Boeing recommends that the inspection and any applicable replacement given in this service bulletin

be done within 24 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.

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 inspection for each crew

oxygen mask stowage box unit. 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 find the tools.

Group 1:

Task Number of Persons Task Hours Elapsed Hours

Open Access 1 0.25 0.25

Figure 1 1 0.75 0.75

Figure 3 1 1.00 1.00

Test 1 1.25 1.25

Close Access 1 1.00 1.00

INSPECTION ONLY TOTAL FOR EACH 2.00 (b) 2.00 (b)

AIRPLANE

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BOEING SERVICE BULLETIN 747-35A2126

ALERT ALERT
Group 1:

Task Number of Persons Task Hours Elapsed Hours

INSPECTION AND REPLACEMENT TOTAL 4.25 (a), (b) 4.25 (a), (b)

FOR EACH AIRPLANE

Group 2:

Task Number of Persons Task Hours Elapsed Hours

Open Access 1 0.25 0.25

Figure 2 1 0.75 0.75

Figure 4 1 1.00 1.00

Test 1 1.25 1.25

Close Access 1 1.00 1.00

INSPECTION ONLY TOTAL FOR EACH 2.00 (b) 2.00 (b)

AIRPLANE

INSPECTION AND REPLACEMENT TOTAL 4.25 (a), (b) 4.25 (a), (b)

FOR EACH AIRPLANE

(a) The time to package and return the affected crew oxygen mask stowage box unit in accordance

with Zodiac Services (Intertechnique) Service Bulletin MXP1/4-35-175 Rev 02 is not included.

(b) The time to perform the General Visual Inspection in accordance with Zodiac Services (Intertechnique)

Service Bulletin MXP1/4-35-175 Rev 02 is not included.

H. Weight and Balance Changes

None.

I. Electrical Load Data

Not changed.

J. References

1. Existing Data

a. Service Related Problem (SRP) 747-SRP-35-0044

b. 747-400 Aircraft Maintenance Manual (AMM) 23-51-00, 35-00-00, 35-11-00, 35-11-18, 52-51-00

c. Standard Overhaul Practices Manual (SOPM) 20-70-01

d. Zodiac Services (Intertechnique), Service Bulletin MXP1/4-35-175, Rev. 02

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BOEING SERVICE BULLETIN 747-35A2126

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

e. FAA Notice of Proposed Rule Making 2010-NM-094-AD.

2. Data supplied with this Service Bulletin

None.

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

Drawing Number Title

232U8002 EQUIPMENT INSTALLATION - CREW OXYGEN

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:

None.

2. Damage Tolerance Based Structural Inspections:

Boeing has evaluated 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

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

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BOEING SERVICE BULLETIN 747-35A2126

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BOEING SERVICE BULLETIN 747-35A2126

ALERT ALERT

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. Refer to Zodiac Services (Intertechnique) service bulletin, MXP1/4-35-175 Rev 02.

B. Industry Support Information

Boeing warranty remedies are not available for the operator action(s) given in this service bulletin.

Please refer to Zodiac Services (Intertechnique), Service Bulletin MXP1/4-35-175, Rev 02 for more

information.

C. Parts Necessary For Each Airplane

1. Kits/Parts

None.

2. Parts and Materials Supplied by the Operator

Group 1:

Part Number / QTY Name Notes

Specification

Part number 4 Crew oxygen mask stowage box unit (c), (a), (e)

MXP147-3

Cap - Protective, Aluminum, Flare- (b), (d)

less Tube

BACC14AG5 1-4

Plug - Protective, Aluminum, Flare- (b), (d)

less Tube

BACP20BG5 1-4

(a) Package and return affected serial number crew oxygen mask stowage box units in accordance with Zodiac Services (Intertechnique) Service Bulletin MXP1/4-35-175 Rev 02.

(b) The quantity can vary depending on the work sequence. The maximum is listed for concurrent accomplishment of all crew oxygen mask stowage box units. One is required if

work is done in serial.

(c) Intertechnique, 61 Rue Pierre Curie, Boite Postale 1, 78734 Plaisir Cedex, France, Cage

Code F5341, Phone: 01 30 54 82 00. (Avox-Eros Services, INC., 6734 Valjean Avenue,

Van Nuys, CA., 91406-5818, Cage Code 55912, Phone: 818-435-0945, Fax: 818-435-

0995.)

(d) Caplugs LLC., DBA Mokon Div Caplugs, 2150 Elmwood Ave., Buffalo, NY., 14207-7198,

Cage Code 99017, Phone: 716-876-9855, Fax: 716-874-1680.

(e) Crew oxygen mask stowage box units can be ordered from Zodiac Services (Intertechnique) per service bulletin, MXP1/4-35-175 Rev 02.

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BOEING SERVICE BULLETIN 747-35A2126

ALERT ALERT
Group 2:

Part Number / QTY Name Notes

Specification

Part number 3 Crew oxygen mask stowage box unit (c), (a), (e)

MXP402

Cap - Protective, Aluminum, Flare- (b), (d)

less Tube

BACC14AG5 1-3

Plug - Protective, Aluminum, Flare- (b), (d)

less Tube

BACP20BG5 1-3

(a) Package and return affected serial number crew oxygen mask stowage box units in accordance with Zodiac Services (Intertechnique) Service Bulletin MXP1/4-35-175 Rev 02.

(b) The quantity can vary depending on the work sequence. The maximum is listed for concurrent accomplishment of all crew oxygen mask stowage box units. One is required if

work is done in serial.

(c) Intertechnique, 61 Rue Pierre Curie, Boite Postale 1, 78734 Plaisir Cedex, France, Cage

Code F5341, Phone: 01 30 54 82 00. (Avox-Eros Services, INC., 6734 Valjean Avenue,

Van Nuys, CA., 91406-5818, Cage Code 55912, Phone: 818-435-0945, Fax: 818-435-

0995.)

(d) Caplugs LLC., DBA Mokon Div Caplugs, 2150 Elmwood Ave., Buffalo, NY., 14207-7198,

Cage Code 99017, Phone: 716-876-9855, Fax: 716-874-1680.

(e) Crew oxygen mask stowage box units can be ordered from Zodiac Services (Intertechnique) per service bulletin, MXP1/4-35-175 Rev 02.

3. Parts Modified and Reidentified

See Zodiac Services (Intertechnique) Service Bulletin MXP1/4-35-175, Rev 02.

4. Parts Removed and Not Replaced

None.

D. Parts Necessary to Change Spares

Boeing has canvassed Boeing Spares and Operator Spares and determined there are spares affected.

To get the parts shown below, refer to Paragraph 2.A., Material - Price and Availability.

Part Number Name QTY

Not

Applicable

Crew oxygen mask

stowage box unit

MXP402

E. Special Tooling - Price and Availability

None.

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BOEING SERVICE BULLETIN 747-35A2126

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

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

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

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

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ALERT ALERT
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BOEING SERVICE BULLETIN 747-35A2126

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. 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. A General Visual Inspection is defined as: A visual examination of an interior or

exterior area, installation or assembly to detect obvious damage, failure or irregularity.

This level of inspection is made from within touching distance unless otherwise

specified. A mirror may be necessary to enhance visual access to all exposed surfaces

in the inspection area. This level of inspection is made under normally available

lighting conditions such as daylight, hangar lighting, flashlight or drop-light and may

require removal or opening of access panels or doors. Stands, ladders or platforms

may be required to gain proximity to the area being checked.

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.

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BOEING SERVICE BULLETIN 747-35A2126

ALERT ALERT
B. WORK INSTRUCTIONS

WARNING: MAKE SURE THAT THE OXYGEN SYSTEM IS DEACTIVATED AND THE OXYGEN

CYLINDERS ARE FULLY CLOSED. IF THE OXYGEN SYSTEM IS NOT DEACTIVATED

AND THE OXYGEN CYLINDERS ARE NOT FULLY CLOSED, THE OXYGEN SYSTEM

MAY BE PRESSURIZED. IF WORK IS DONE ON A PRESSURIZED OXYGEN SYSTEM,

INJURY TO PERSONNEL OR DAMAGE TO EQUIPMENT CAN OCCUR.

WARNING: CLOSE THE SHUTOFF VALVE ON THE CREW OXYGEN CYLINDERS SLOWLY. FIRE

CAN RESULT IF VALVE IS CLOSED TOO QUICKLY. THIS CAN CAUSE INJURY TO

PERSONS AND DAMAGE TO THE AIRPLANE AND EQUIPMENT.

CAUTION: DO NOT TIGHTEN THE SHUTOFF VALVE ON THE CREW OXYGEN CYLINDERS

MORE THAN 25 POUND-INCHES. THIS CAN CAUSE DAMAGE TO THE SHUTOFF

VALVE.

CAUTION: MAXIMUM PERMITTED OPEN TIME FOR OXYGEN TUBES, HOSES AND

COMPONENTS IS 5 MINUTES.

CAUTION: OXYGEN SYSTEM COMPONENTS REQUIRE SPECIAL CARE AND HANDLING

PROCEDURES. REVIEW THE SAFETY AND MAINTENANCE PROCESSES SHOWN

IN 747 AMM 35-00-00 PRIOR TO MAKING ANY CHANGES TO THE OXYGEN SYSTEM.

1. Open access to flight compartment, refer to 747-400 AMM 52-51-00 as an accepted procedure.

2. Group 1:

Perform a General Visual Inspection of the crew oxygen mask stowage box units in accordance

with Figure 1.

– (a.) No more work is required for crew oxygen mask stowage box units that do not have

affected serial numbers. Return the crew oxygen mask stowage box unit to its installed position

and tighten the four quarter turn fasteners on the crew oxygen mask stowage box unit. Go to

step 11.

– (b.) Crew oxygen mask stowage box units that have affected serial numbers require

replacement. Go to step 3.

– (c.) Crew oxygen mask stowage box units that have affected serial numbers which were

changed in accordance with the original issue of this service bulletin require additional work.

Accomplish Zodiac Services (Intertechnique) service bulletin MXP1/4-35-175 R02.

Group 2:

Perform a General Visual Inspection of the crew oxygen mask stowage box units in accordance

with Figure 2.

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BOEING SERVICE BULLETIN 747-35A2126

ALERT ALERT
– (a.) No more work is required for crew oxygen mask stowage box units that do not have

affected serial numbers. Return the crew oxygen mask stowage box unit to its installed position

and tighten the four quarter turn fasteners on the crew oxygen mask stowage box unit. Go to

step 11.

– (b.) Crew oxygen mask stowage box units that have affected serial numbers require

replacement. Go to step 3.

– (c.) Crew oxygen mask stowage box units that have affected serial numbers which were

changed in accordance with the original issue of this service bulletin require additional work.

Accomplish Zodiac Services (Intertechnique) service bulletin MXP1/4-35-175 R02.

3. Open access to the crew oxygen cylinders. Close the shutoff valve.

4. Detach crew oxygen mask from the affected crew oxygen mask stowage box unit, retain for

re-installation. Refer to 747-400 AMM 35-11-18 as an accepted procedure.

5. Group 1:

Replace affected crew oxygen mask stowage box units in accordance with Figure 3.

NOTE: The oxygen supply line hose and wire bundle length will allow pulling the crew oxygen

mask stowage box unit up onto the console before the disconnections are made.

Group 2:

Replace affected crew oxygen mask stowage box units in accordance with Figure 4.

NOTE: The oxygen supply line hose and wire bundle length will allow pulling the crew oxygen

mask stowage box unit up onto the console before the disconnections are made.

WARNING: OPEN THE SHUTOFF VALVE ON THE CREW OXYGEN CYLINDERS SLOWLY. FIRE

CAN RESULT IF VALVE IS OPENED TOO QUICKLY. THIS CAN CAUSE INJURY TO

PERSONS AND DAMAGE TO THE AIRPLANE AND EQUIPMENT.

CAUTION: DO NOT TIGHTEN THE SHUTOFF VALVE ON THE CREW OXYGEN CYLINDERS

MORE THAN 25 POUND-INCHES. THIS CAN CAUSE DAMAGE TO THE SHUTOFF

VALVE.

6. Re-attach the crew oxygen mask to the crew oxygen mask stowage box unit and tighten the four

quarter turn fasteners on the crew oxygen mask stowage box unit. Refer to 747-400 AMM 35-11-18

as an accepted procedure.

7. Slowly turn the crew oxygen cylinder shutoff valve until fully opened.

8. Close crew oxygen cylinder shutoff valve one-fourth of a turn. Install Lock wire on the shutoff

valves.

9. Close access to the crew oxygen cylinders.

10. Perform oxygen system testing:

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BOEING SERVICE BULLETIN 747-35A2126

ALERT ALERT
– If not previously accomplished, do a crew oxygen system dispatch and pressure indication

test refer to 747-400 AMM 35-11-00 as an accepted procedure.

– If not previously accomplished, do a crew oxygen mask stowage box test refer to 747-400

AMM 35-11-00 as an accepted procedure.

– If not previously accomplished, do a crew oxygen mask/regulator test refer to 747-400 AMM

35-11-00 as an accepted procedure.

– If not previously accomplished, do a system leak test refer to 747-400 AMM 35-11-00 as an

accepted procedure.

– If not previously accomplished, verify the oxygen mask microphone test has been completed

refer to 747-400 AMM 23-51-00 part g as an accepted procedure.

11. Close access to flight compartment, refer to 747-400 AMM 52-51-00 as an accepted procedure.

12. Put the airplane back to a serviceable condition.

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BOEING SERVICE BULLETIN 747-35A2126

ALERT ALERT
This Figure applies only to: Group 1.

FIGURE 1: FLIGHT COMPARTMENT - CREW OXYGEN MASK STOWAGE BOX UNIT - INSPECTION

(SHEET 1 OF 2)

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BOEING SERVICE BULLETIN 747-35A2126

ALERT ALERT
STEP TASK NAME IDENTIFICATION QTY MORE DATA

CREW OXYGEN MXP147-3 4 (a)

MASK STOWAGE BOX

UNIT

1 Loosen

CREW OXYGEN MXP147-3 4 (b), (c)

MASK STOWAGE BOX

UNIT

2 Inspect

(a) The four quarter turn fasteners on the crew oxygen mask stowage box unit.

(b) General Visual Inspection for affected part number with serial numbers in accordance with Zodiac Services

(Intertechnique) service bulletin MXP1/4-35-175 Rev 02.

(c) The serial number tag is on the forward side of the crew oxygen stowage box unit. The number can be

read when lifting the box up to expose it. It is not necessary to detach the supply line.

FIGURE 1: FLIGHT COMPARTMENT - CREW OXYGEN MASK STOWAGE BOX UNIT - INSPECTION

(SHEET 2 OF 2)

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BOEING SERVICE BULLETIN 747-35A2126

ALERT ALERT
This Figure applies only to: Group 2.

FIGURE 2: FLIGHT COMPARTMENT - CREW OXYGEN MASK STOWAGE BOX UNIT - INSPECTION

(SHEET 1 OF 2)

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BOEING SERVICE BULLETIN 747-35A2126

ALERT ALERT
STEP TASK NAME IDENTIFICATION QTY MORE DATA

CREW OXYGEN MXP402 4 (a)

MASK STOWAGE BOX

UNIT

1 Loosen

CREW OXYGEN MXP402 4 (b), (c)

MASK STOWAGE BOX

UNIT

2 Inspect

(a) The four quarter turn fasteners on the crew oxygen mask stowage box unit.

(b) General Visual Inspection for affected part number with serial numbers in accordance with Zodiac Services

(Intertechnique) service bulletin MXP1/4-35-175 Rev 02.

(c) The serial number tag is on the forward side of the crew oxygen stowage box unit. The number can be

read when lifting the box up to expose it. It is not necessary to detach the supply line.

FIGURE 2: FLIGHT COMPARTMENT - CREW OXYGEN MASK STOWAGE BOX UNIT - INSPECTION

(SHEET 2 OF 2)

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BOEING SERVICE BULLETIN 747-35A2126

ALERT ALERT
This Figure applies only to: Group 1.

FIGURE 3: FLIGHT COMPARTMENT - CREW OXYGEN MASK STOWAGE BOX UNIT - REPLACEMENT

(SHEET 1 OF 2)

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BOEING SERVICE BULLETIN 747-35A2126

ALERT ALERT
WARNING: DO NOT WORK ON THE PRESSURIZED OXYGEN SYSTEM WHEN THERE IS OIL, GREASE,

FLAMMABLE SOLVENTS, LINT, METAL FILINGS, OR OTHER COMBUSTIBLE MATERIALS IN

THE AREA. THESE MATERIALS CAN CAUSE A FIRE OR AN EXPLOSION WHEN THEY ARE

NEAR PRESSURIZED OXYGEN. REFER TO 747 MAINTENANCE MANUAL SUBJECTS 35-00-00

AND 35-11-00 AS ACCEPTED PROCEDURES.

CAUTION: OXYGEN SYSTEM COMPONENTS REQUIRE SPECIAL HANDLING AND PROCESSING.

RETURN ANY CONTAMINATED EQUIPMENT TO VENDOR.

CAUTION: OPEN EXPOSURE OF THE OXYGEN SYSTEM IS TO BE KEPT TO A MINIMUM. TO PROTECT

THE INTEGRITY OF THE OXYGEN SYSTEM, COVER AND SEAL OPEN LINES WITH SUITABLE

PLASTIC BAG, CAP, OR PLUG.

STEP TASK NAME IDENTIFICATION QTY MORE DATA

CREW OXYGEN MXP147-3 4 (a), (c)

MASK STOWAGE BOX

UNIT

1 Remove

CREW OXYGEN MXP147-3 4 (a), (b), (c)

MASK STOWAGE BOX

UNIT

2 Install (Changed)

(a) Refer to 747-400 AMM 35-11-18 as an accepted procedure.

(b) If the oxygen flex hose that attaches at the bottom of the crew oxygen mask stowage box unit is not to

be connected to the new crew oxygen mask stowage box unit within 5 minutes, refer to 747-400 AMM

35-00-00 and SOPM 20-70-01 as accepted procedures.

(c) Refer to Zodiac Services (Intertechnique) Service Bulletin MXP1/4-35-175, Rev 02 for detailed instructions.

FIGURE 3: FLIGHT COMPARTMENT - CREW OXYGEN MASK STOWAGE BOX UNIT - REPLACEMENT

(SHEET 2 OF 2)

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BOEING SERVICE BULLETIN 747-35A2126

ALERT ALERT
This Figure applies only to: Group 2.

FIGURE 4: FLIGHT COMPARTMENT - CREW OXYGEN MASK STOWAGE BOX UNIT - REPLACEMENT

(SHEET 1 OF 2)

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BOEING SERVICE BULLETIN 747-35A2126

ALERT ALERT
WARNING: DO NOT WORK ON THE PRESSURIZED OXYGEN SYSTEM WHEN THERE IS OIL, GREASE,

FLAMMABLE SOLVENTS, LINT, METAL FILINGS, OR OTHER COMBUSTIBLE MATERIALS IN

THE AREA. THESE MATERIALS CAN CAUSE A FIRE OR AN EXPLOSION WHEN THEY ARE

NEAR PRESSURIZED OXYGEN. REFER TO 747 MAINTENANCE MANUAL SUBJECTS 35-00-00

AND 35-11-00 AS ACCEPTED PROCEDURES.

CAUTION: OXYGEN SYSTEM COMPONENTS REQUIRE SPECIAL HANDLING AND PROCESSING.

RETURN ANY CONTAMINATED EQUIPMENT TO VENDOR.

CAUTION: OPEN EXPOSURE OF THE OXYGEN SYSTEM IS TO BE KEPT TO A MINIMUM. TO PROTECT

THE INTEGRITY OF THE OXYGEN SYSTEM, COVER AND SEAL OPEN LINES WITH SUITABLE

PLASTIC BAG, CAP, OR PLUG.

STEP TASK NAME IDENTIFICATION QTY MORE DATA

CREW OXYGEN MXP402 3 (a), (c)

MASK STOWAGE BOX

UNIT

1 Remove

CREW OXYGEN MXP402 3 (a), (b), (c)

MASK STOWAGE BOX

UNIT

2 Install (Changed)

(a) Refer to 747-400 AMM 35-11-18 as an accepted procedure.

(b) If the oxygen flex hose that attaches at the bottom of the crew oxygen mask stowage box unit is not to

be connected to the new crew oxygen mask stowage box unit within 5 minutes, refer to 747-400 AMM

35-00-00 and SOPM 20-70-01 as accepted procedures.

(c) Refer to Zodiac Services (Intertechnique) Service Bulletin MXP1/4-35-175, Rev 02 for detailed instructions.

FIGURE 4: FLIGHT COMPARTMENT - CREW OXYGEN MASK STOWAGE BOX UNIT - REPLACEMENT

(SHEET 2 OF 2)

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BOEING SERVICE BULLETIN 747-35A2126

ALERT ALERT