CUSTOMER SERVICES DIRECTORATE

1 ROND POINT MAURICE BELLONTE

31707 BLAGNAC CEDEX FRANCE

TELEPHONE + 33 (0)5 61 93 33 33

ALERT OPERATORS TRANSMISSION - AOT

AOT ref: A35W008-14 Rev 00 Page 1 of 4 Date: 18-DEC-2014

© AIRBUS S.A.S. 2014. ALL RIGHTS RESERVED. CONFIDENTIAL AND PROPRIETARY DOCUMENT

SUBJECT: ATA 35 – CHEMICAL OXYGEN GENERATORS EARLY REPLACEMENT

AIRCRAFT TYPE: A300-600, A310, AST

OUR REF.: A35W008-14 Rev 00 dated 18-DEC-2014

1. AIRCRAFT AFFECTED

All A300-600, A300-600-ST, A310 equipped with 15 & 22 minutes chemical oxygen generators PN

117042-XX manufactured in 2000 and 2001 by B/E Aerospace.

Oxygen generators PN details:

117042-02 (15 min – 2 masks)

117042-03 (15 min – 3 masks)

117042-04 (15 min – 4 masks)

117042-22 (22 min – 2 masks)

117042-23 (22 min – 3 masks)

117042-24 (22 min – 4 masks)

2. REFERENCED DOCUMENTATION

B/E Aerospace SIL D1019-01

B/E Aerospace VSB 117042-35-001

2.1 APPENDIX

Appendix A: Generator activation template

2.2 REFERENCES

Ref. 1: MPD task 352101-03-1 - Discard and replace chemical oxygen generator in lavatory (for A300-

600)

Ref. 2: MRD task 35.20.00/03 – Lavatory oxygen system – Discard generators (for A300-600-ST)

Ref. 3: MPD task 352113-01-1 - Discard chemical oxygen generators (for A300-600 and A310)

Ref. 4: AMM task 35-21-13 PB 401 – Emergency oxygen generators-Removal/Installation

Ref. 5: AMM task 35-21-11 PB 401 - Emergency oxygen container - Removal/Installation

3. REASON

This AOT is issued to inform the affected operators of identified and still under investigation premature

ageing on chemical oxygen generator PN 117042-XX manufactured by B/E Aerospace. Some operators

reported that some generators manufactured in 1999, 2000 and 2001 failed to activate. Given the

number of failed units reported, all the generators dated 1999, 2000 and 2001 shall be removed from

the field.

 As required by MPD and MRD tasks “Ref. 1 to 3”, the generators manufactured in 1999 must be

discarded before end of 2014. Therefore, this population is considered as being already

covered by existing MPD and MRD tasks and is not considered within this AOT.

 The management of generators manufactured in 2000 and 2001 is described in paragraph 3.3

3.1 FACTS
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The MPD and MRD tasks “Ref. 1 to 3” require the replacement of chemical oxygen generators every 15

years.

During this replacement, it is normally required to initiate the chemical reaction of the removed

generators for proper disposal. B/E Aerospace SIL D1019-01 is the document which provides

instructions for the activation and the disposal of a removed generator.

On each chemical oxygen generator, there is an indicator which changes colour with heat, indicating

that the reaction producing oxygen took place. Some operators reported that when they tried to activate

generators manufactured in 1999, 2000 and 2001 after removal from the oxygen containers, some of

them failed to activate. The affected generators PN are 117042-XX (either 15 min or 22 min oxygen

duration).

3.2 CONSEQUENCES

Chemical generators manufactured in 1999, 2000 and 2001 may fail to activate and may not deliver

oxygen when needed in abnormal and unusual operational circumstances.

3.3 AIM

 This AOT requires the replacement of all oxygen generators manufactured in 2000, in priority.

 This AOT requires that the generators dated 2001 be replaced after generators dated 2000 are

replaced. However, to limit operational disturbance, when inspecting an aircraft suspected to

have generators dated 2000, it is requested to remove any generator dated 2001 that is found.

For information, the generator manufacturing date is written on the generator label and on the

oxygen container test lever sticker.

Note: Based on feedback on operators practices, spare parts manufactured in 2000 & 2001 may

have only been fitted on aircraft manufactured in 1988 or before. Nevertheless, operators must

ensure that any spare generator dated 2000 or 2001, potentially fitted on their fleet, is removed in

the same time constraints as mentioned in paragraph 4.1.1.

- For 15 min generators (PN 117042-0X), replacement generators manufactured in Lübeck,

Germany by B/E Aerospace will be delivered with a kit in order to adapt the generator inside the

container. Instructions for this replacement are given in the AMM task “Ref. 5” and in the B/E

Aerospace VSB 117042-35-001.

- For 22 min generators (PN 117042-2X), fully interchangeable containers manufactured in

Lübeck, Germany by B/E Aerospace will be delivered. Alternatively, replacement generators

manufactured in Lenexa, US can also be ordered. They will fit directly in the current

containers and will not need any adaptation such as the 15 min ones. The 22 min generator

PN remains the same. Instructions for this replacement are given in the AMM task “Ref. 4 and

5”.

If an operator has generators PN 117042-XX in stock, with a manufacturing date of 2005 or later, they

may be used as well (generators with manufacturing date before 2005 shall not be used).

After the replacement, this AOT requires to activate all the removed generators (as per instructions on

SIL D1019-01) and requires to record for each generator the PN, the date of manufacture, the lot code

and whether or not the chemical reaction worked properly (checking the colour indicator). The template

to record the activation results is provided in the appendix A of this AOT. This feedback from the
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© AIRBUS S.A.S. 2014. ALL RIGHTS RESERVED. CONFIDENTIAL AND PROPRIETARY DOCUMENT

operators is necessary for supporting the on-going investigation, will allow to determine the extent of this

issue and will help to define further continued airworthiness actions.

Please refer to paragraph “7. REPORTING” to submit your feedback.

4. SHORT TERM ACTION

4.1 PLANNING AND MANPOWER

4.1.1 ACCOMPLISHMENT TIMESCALE

Replacement of all oxygen generators PN 117042-XX manufactured in 2000 must be done as far as

possible in advance of the MPD requirements and in any case not later than June 2015, whichever

occurs first.

Replacement of all oxygen generators PN 117042-XX manufactured in 2001 must be done as far as

possible in advance of the MPD requirements and in any case not later than December 2015 whichever

occurs first.

4.2 DESCRIPTION

For 15 min generators (PN 117042-0X), please refer to AMM task “Ref. 5” and to B/E Aerospace VSB

117042-35-001 providing instructions for disassembly, assembly and testing.

For 22 min generators (PN 117042-2X), please refer to the AMM task “Ref. 4 and 5”.

If an operator has generators PN 117042-XX in stock, with a manufacturing date of 2005 or later, they

may be used as well (generators with manufacturing date before 2005 shall not be used).

This AOT is the subject of an AIRBUS monitored retrofit campaign, which will be detailed in a Retrofit

Information Letter (RIL).

For the organisation of this retrofit, you are kindly requested to contact AIRBUS retrofit management

department:

AIRBUS CUSTOMER SERVICES DIRECTORATE

1 Rond-Point Maurice Bellonte

31707 BLAGNAC CEDEX

France

Tel: (33) 5 67 19 06 22

E-mail: monitored.retrofit@airbus.com

Fax: (33) 5 61 93 27 45

5. FURTHER INFORMATION

5.1 FOLLOW-UP PLAN

Airbus have currently not received any failure report on generators manufactured in 2002 and after.

However, in order to investigate further this potential premature ageing, a sampling test on generators

manufactured in 2002 and 2003 will be performed. The results of this sampling will allow Airbus and B/E

Aerospace to adjust the retrofit and the sampling actions on these units if necessary.

5.2 IMPACTED DOCUMENTATION
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© AIRBUS S.A.S. 2014. ALL RIGHTS RESERVED. CONFIDENTIAL AND PROPRIETARY DOCUMENT

As explained in paragraph 3.3, the 15 min replacement generators will be delivered with a kit in order to

adapt the new generator inside the container as described in VSB 117042-35-001. This adaptation will

lead to a container PN change. The post-MOD container is two way interchangeable with the pre-MOD

one. The IPC will be updated accordingly.

6. AOT APPROVAL

The technical content of this document is approved under the authority of DOA nr. EASA.21J.031.

7. REPORTING

The results of generator activation and questions about this AOT and are to be sent to Airbus Customer

Services engineering as soon as possible, after the AOT application, to the attention of:

Mr. Florent FARBOS

Engineer

Emergency & Cabin Systems, Galleys & Lav’s

Customer Services Engineering - SEEC2

Phone: +33 (0)5 82 05 51 06

Fax: +33 (0)5 61 93 44 25

Mailto:florent.farbos@airbus.com

AIRBUS S.A.S.

1 rond-point Maurice Bellonte

31707 Blagnac Cedex

France

Best Regards,

Jean-Luc MOUYSSET

VICE PRESIDENT ENGINEERING SUPPORT

CUSTOMER SERVICES

Philippe BOUCHERAT

VICE PRESIDENT A300/A310 PROGRAMME

CUSTOMER SERVICES
AOT A35W008-14 - Appendix A

Airline:

Program:

MSN:

Activation ok? 

(colour indicator)

PN MFG Date Lot Number Yes or No

ATA35 - chemical oxygen generators activation results

How many generators activated correctly:

How many generators failed:

Generators info