SERVICE BULLETIN

30 May 2008

Rev. 1, 13 Apr 2010 Page 1 of 7

174080-35-02

The information disclosed herein was originated by and is the property of B/E Aerospace, Inc., and except for 

rights expressly granted to the U.S. Government, B/E Aerospace, Inc. reserves all patent, proprietary, design, use, 

manufacturing, and reproduction rights thereto.

OXYGEN - PASSENGER OXYGEN SYSTEM 

MASK IN-LINE FLOW INDICATOR REPLACEMENT

I. Planning Information

A. Effectivity

This Service Bulletin applies to Airbus aircraft that use passenger oxygen mask part numbers 

174080-XX, 174085-XX, 174095-XX, and 174098-XX manufactured on or after January 1, 2002 and 

before March 1, 2006. Table 1 below lists the effective B/E part numbers. This Service Bulletin applies 

to spare masks in stores, as well as those installed on aircraft.

Table 1

Effective Passenger Mask Part Numbers

B. Reason

Some existing flow indicators are vulnerable to fracturing which causes parts of the indicator to 

separate. If this occurs, the oxygen cannot flow to the user of the mask when needed during an 

emergency. 

B/E PART NUMBER

174080-73 174085-96 174098-01

174080-74 174085-97 174098-02

174080-76 174085-98 174098-03

174080-87 174095-1E 174098-04

174080-96 174095-73 174098-05

174080-97 174095-74 174098-06

174080-98 174095-76

174085-73 174095-87

174085-74 174095-96

174085-76 174095-97

174085-87 174095-98
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C. Description

This Service Bulletin describes the optional replacement of flow indicator part number 118023-02 with 

the improved flow indicator part number 118023-12. The improved flow indicator can be identified by 

the green marking (refer to Figure 1).

The operator may purchase a replacement mask with the improved flow indicator installed as an 

alternative to performing the modification covered by this Service Bulletin.

Figure 1 

Flow Indicators

D. Compliance

Performance of this Service Bulletin is optional. 

E. Approval

This Service Bulletin has been reviewed by Airbus and the FAA.

F. Manpower

Assuming access has been obtained to the unit, the following is an estimate to accomplish the 

modification:

Verification: .6 min.

Disassembly: .3 min.

Assembly: 1.2 min.

Testing: .4 min.

Cleaning: .5 min.

Total Modification: 3.0 min.

G. Material - Price and Availability

(1) Modification requires the following:

Quantity Part Number Name

1 118023-12 Flow Indicator
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(2) Material may be obtained from:

B/E Aerospace, Inc.

Commercial Aircraft Products Group

10800 Pflumm Road

Lenexa, KS 66215

TEL: (913) 338-9800

FAX: (913) 469-8419

(3) Delivery determined upon request.

H. Tooling - Price and Availability

Tubing Stretcher Tool part number 997300-00, available from B/E Aerospace, Lenexa, KS (refer to 

Figure 2). 

I. Weight and Balance

This modification will not affect the weight or balance.

J. Electrical Load Data

This modification will not affect electrical load data.

K. Other Publications Affected

Part Number CMM Number Dated

174080-XX 35-20-96 2003/06/12

174085-XX 35-24-02 2002/07/24

174095-XX 35-24-04 2000/11/01

II. Accomplishment Instructions

A. Verification

(1) Make sure the part number shown on the mask data label is listed in Table 1. If the part number is 

not listed, no further action is required (refer to Figure 3 for location of data label).

(2) Make sure the date of manufacture shown on the mask data label is on or after January 1, 2002 

and before March 1, 2006. If the date is outside this range, no further action is required (refer to 

Figure 3 for location of data label).

(3) Make sure the marking, "FLOW", on the flow indicator is in black and the letter "W" does not appear

on the right side of the mask data label (approximate location is shown in Figure 3). In the event the

marking on the flow indicator is in green and the letter "W" is on the right side of the data label, flow 

indicator replacement has already been implemented. No further action is required.

B. Disassembly (refer to Figure 3)

WARNING: THE USE OF OIL AND OTHER PETROLEUM BASE LUBRICANTS ON OXYGEN 

EQUIPMENT WILL CREATE A DANGEROUS FIRE HAZARD.

CAUTION: THE WORK AREA MUST BE CLEAN AND FREE OF HYDROCARBON RESIDUE, OIL, 

OR OTHER PETROLEUM BASE LUBRICANTS.
30 May 2008 174080-35-02

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CAUTION: ALL INSTRUMENTS, TOOLS, FIXTURES, TEST EQUIPMENT, AND OTHER 

MATERIALS WHICH COME INTO CONTACT EITHER DIRECTLY OR INDIRECTLY 

WITH THE UNIT OR ITS PARTS SHOULD BE CLEAN AND FREE OF HYDROCARBON 

RESIDUE, OIL, OR OTHER PETROLEUM BASE LUBRICANTS.

WARNING: BE CAREFUL TO CUT OFF ONLY A MINIMUM AMOUNT OF TUBING (1, 4). CUT OFF 

NO MORE THAN TWO INCHES OF TUBING FROM BOTH TUBES (1, 4) TOGETHER.

(1) Cut the supply tube (4) loose from the flow indicator (2).

(2) Cut the flow indicator (2) loose from the mask bag assembly tube (1).

NOTE: Cut the tubing (1, 4) square so that the end is flat and perpendicular to the axis of the tube.

C. Assembly (refer to Figure 3 unless otherwise stated)

WARNING: THE USE OF OIL AND OTHER PETROLEUM BASE LUBRICANTS ON OXYGEN 

EQUIPMENT WILL CREATE A DANGEROUS FIRE HAZARD.

CAUTION: THE WORK AREA MUST BE CLEAN AND FREE OF HYDROCARBON RESIDUE, OIL, 

OR OTHER PETROLEUM BASE LUBRICANTS.

CAUTION: ALL INSTRUMENTS, TOOLS, FIXTURES, TEST EQUIPMENT, AND OTHER 

MATERIALS WHICH COME INTO CONTACT EITHER DIRECTLY OR INDIRECTLY 

WITH THE UNIT OR ITS PARTS SHOULD BE CLEAN AND FREE OF HYDROCARBON 

RESIDUE, OIL, OR OTHER PETROLEUM BASE LUBRICANTS.

WARNING: THE NEW FLOW INDICATOR (3) MUST BE INSTALLED SO THAT THE FLOW 

DIRECTION IS FROM THE SUPPLY TUBE (4) TOWARD THE MASK BAG 

ASSEMBLY TUBE (1). THE ARROW ON THE FLOW INDICATOR (3) SHOULD POINT 

TOWARDS THE BAG. IF THE NEW FLOW INDICATOR (3) IS INSTALLED 

BACKWARDS, THE FLOW INDICATOR WILL NOT SHOW WHEN OXYGEN FLOWS 

TO THE MASK.

CAUTION: THE SUPPLY TUBE (4) AND THE MASK BAG ASSEMBLY TUBE (1) ENDS SHOULD 

ALWAYS BE FULLY INSTALLED ON THE FLOW INDICATOR (3) (UP TO THE 

SHOULDER OF THE FLOW INDICATOR).

CAUTION: THE TUBING STRETCHER TOOL PART NUMBER 997300-00 MUST BE SECURED 

TO A BENCH TOP BEFORE USE (REFER TO FIGURE 2).

(1) Use the Tubing Stretcher Tool part number 997300-00 (refer to Figure 2) to expand the inside 

diameter of the end of the mask bag assembly tube (1).

CAUTION: DO NOT MAKE THE INSIDE DIAMETER OF THE MASK BAG ASSEMBLY TUBE (1) 

LARGER THAN THE DIAMETER NEEDED TO PUT THE TUBE OVER THE OUTSIDE 

OF THE FITTING OF THE NEW FLOW INDICATOR (3). DO NOT MAKE THE INSIDE 

DIAMETER OF THE MASK BAG ASSEMBLY TUBE (1) SO LARGE THAT THE TUBE 

SPLITS OR DISCOLORATION OF THE TUBE OCCURS.

(2) Attach the prepared end of the mask bag assembly tube (1) to the clear window end of the flow 

indicator (3). Slide the tubing on the open end of the flow indicator (3) until the mask bag assembly 

tube (1) end meets the shoulder of the flow indicator (3). 
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CAUTION: WHILE PUTTING THE TUBE ON THE FLOW INDICATOR (3), DO NOT USE TOO 

MUCH FORCE THAT MAY DAMAGE THE FLOW INDICATOR (3).

NOTE: Momentarily dipping the tube (1) end into denatured alcohol or isopropyl alcohol 

(commercially available) will make it easier to slide the tube (1) on the flow indicator (3).

(3) Use the Tubing Stretcher Tool part number 997300-00 (refer to Figure 2) to expand the inside 

diameter of the end of the supply tube (4).

CAUTION: DO NOT MAKE THE INSIDE DIAMETER OF THE SUPPLY TUBE (4) LARGER THAN 

THE DIAMETER NEEDED TO PUT THE TUBE OVER THE OUTSIDE OF THE 

FITTING OF THE NEW FLOW INDICATOR (3). DO NOT MAKE THE INSIDE 

DIAMETER OF THE SUPPLY TUBE (4) SO LARGE THAT THE TUBE SPLITS OR 

DISCOLORATION OF THE TUBE OCCURS.

(4) Attach the prepared end of the supply tube (4) on the end of the flow indicator (3) having the green 

marking. Slide the tubing on the open end of the flow indicator (3) until the supply tube (4) end meets 

the shoulder of the flow indicator (3).

CAUTION: WHILE PUTTING THE TUBE ON THE FLOW INDICATOR (3), DO NOT USE TOO 

MUCH FORCE THAT MAY DAMAGE THE FLOW INDICATOR (3).

NOTE: Momentarily dipping the tube (4) end into denatured alcohol or isopropyl alcohol 

(commercially available) will make it easier to slide the tube (4) on the flow indicator (3).

(5) After the tubes (1, 4) have contracted around the flow indicator (3), make sure the tubes (1, 4) are 

tight on the flow indicator (3).

(6) Once the new flow indicator (3) is installed in the assembly, write on the data label on the bag 

assembly with permanent ink. Write the letter "W" on the right side of the data label approximately 

as shown in Figure 3.

Figure 2 

Tubing Stretcher Tool PN 997300-00
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Figure 3 

Passenger Oxygen Mask

D. Testing (refer to Figure 3)

WARNING: IF THE NEW FLOW INDICATOR (3) IS INSTALLED BACKWARDS, THE FLOW 

INDICATOR WILL NOT SHOW WHEN OXYGEN FLOWS TO THE MASK.

(1) Look for the directional arrow that has been stamped on the side of the flow indicator (3) body. The 

flow directional arrow must point toward the oxygen mask bag assembly.

(2) Make sure the directional arrow and markings are in green, showing that the replacement has been 

implemented.

(3) Make sure the letter "W" is on the right side of the data label (approximate location is shown in 

Figure 3), showing that the replacement has been implemented.
30 May 2008 174080-35-02

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E. Cleaning

WARNING: THE USE OF OIL AND OTHER PETROLEUM BASE LUBRICANTS ON OXYGEN 

EQUIPMENT WILL CREATE A DANGEROUS FIRE HAZARD.

CAUTION: THE WORK AREA MUST BE CLEAN AND FREE OF HYDROCARBON RESIDUE, OIL, 

OR OTHER PETROLEUM BASE LUBRICANTS.

CAUTION: DO NOT LET DENATURED ALCOHOL TOUCH THE MASK BAG AS IT MAY REMOVE 

INK ON THE BAG.

(1) Use a clean lint-free cloth moistened with denatured alcohol to lightly wipe down the mask cup and 

tubing. Do not allow cleaning solution to enter tube or reservoir bag. 

(2) Denatured alcohol can be used to remove stains or contamination. 

(3) Allow the mask assembly to fully dry after cleaning.

III. Material Information

Table 2

Materials List

FIG.

NO.

ITEM 

NO. NEW PART NO. QTY DESCRIPTION OLD PART NO.

INSTRUCTIONS/

DISPOSITION

2,3 1 MASK BAG ASSY 

TUBING

820502-00

820770-00 

(174080-XX)

(174085-XX)

(174095-XX)

(174098-XX)

REUSE

1,3 2 1 FLOW INDICATOR 118023-02 DISCARD

1,3 3 118023-12 1 FLOW INDICATOR NEW

2,3 4 SUPPLY TUBING 632080-12

820502-00

076112-00

(174080-XX)

(174085-XX)

(174098-XX)

(174095-XX)

REUSE