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: A35L007-14 Rev 01 Page 1 of 6 Date: 17-JUN-2015

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

SUBJECT: ATA 35 – CHEMICAL OXYGEN GENERATORS EARLY REPLACEMENT

AIRCRAFT TYPE: A330,A340,A340-500,A340-600

OUR REF.: A35L007-14 Rev 01 dated 17-JUN-2015.

OUR PREV. REF.: A35L007-14 Rev 00 dated 18-DEC-2014 

0. REASON FOR REVISION

Sampling and activation tests on oxygen generators manufactured between 1999 and 2004 have been 

performed since the publication of the revision 0 of this AOT. Several generators failed to activate during 

this sampling campaign. Hence, the revision of this AOT is considered to remove any generator older 

than 10 years since date of manufacture.

The revised paragraphs are indicated between **BEG. REV** and **END REV**.

1. AIRCRAFT AFFECTED

**BEG. REV**

All A330, A340, A340-500, A340-600 equipped with 15 & 22 minutes chemical oxygen generators older 

than 10 years since date of manufacture (PN 117042-xx).

**END REV**

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

**BEG. REV**

EASA AD 2014-0277 (Revision 0 of this AOT was mandated by this AD)

B/E Aerospace SIL D1019-01

B/E Aerospace VSB 117042-35-001

RIL LR35M14028324 Rev01

**END REV**

2.1 APPENDIX

Appendix A: Emergency Oxygen Generators - Reporting sheet
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2.2 REFERENCES

**BEG. REV**

Ref. 1: MPD tasks 352001-08-1 & 352142-01-1 - Discard chemical oxygen generators

Ref. 2: MRBR task 35.20.01 - Discard chemical oxygen generators

Ref. 3: AMM task 35-21-42-920-802-A - Discard CRR Chemical Oxygen Generators

Ref. 4: AMM task 35-21-42-920-801-A - Discard Chemical Oxygen Generators

Ref. 5: AMM task 35-21-44 PB 401 - container - emergency oxygen, chemical (crew rest) -

removal/installation

Ref. 6: AMM task 35-21-41 PB 401 - container - emergency oxygen, chemical - removal/installation

**END REV**

3. REASON

**BEG. REV**

This AOT is issued to inform the affected operators of identified and still investigated premature ageing 

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

reported that some generators manufactured between 1999 and 2004 failed to activate during 

maintenance activity. Based on initial analysis, all the generators older than 10 years since date of 

manufacture shall be removed from the field.

 As required by MPD and MRBR tasks “Ref. 1 and Ref. 2”, the generators manufactured in 1999 

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

already covered by existing MPD/MRBR task and is not considered within this AOT.

 The management of generators manufactured in 2000 and 2001 is described in the revision 0 of 

this AOT and is restated in § 3.3.

 The management of generators manufactured after 2001 and older than 10 years since date of 

manufacture is described in this AOT revision 01 and is described in § 3.3.

**END REV**

3.1 FACTS

**BEG. REV**

The MPD and MRBR tasks “Ref. 1 and Ref. 2” 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 between 1999 and 2004 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). 

**END REV**

3.2 CONSEQUENCES

**BEG. REV**

Chemical generators older than 10 years since date of manufacture may fail to activate and may not 

deliver oxygen when needed. 

**END REV**
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3.3 AIM

Restatement of the requirements of AOT revision 0:

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

Airbus assume that these generators are installed on Aircraft delivered the same year or early 

2001. 

 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.

**BEG. REV**

New requirements of this AOT revision 01:

 This AOT requires that the generators older than 10 years since date of manufacture be 

replaced. The compliance time is given in the paragraph 4.1.1 – Accomplishment timescale.

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

oxygen container test lever sticker. 

Note: Regarding spare parts, each Operator must ensure that any spare generator older than 10 

years since date of manufacture, which has been installed on Aircraft, is removed in the same time 

constraints as mentioned in paragraph 4.1.1. 

- For 15 min generators (PN 117042-0X), replacement generators PN E633X0-00 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 AMM tasks “Ref. 3, 

4, 5 and 6” 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. Unlike the previous AOT version, 

replacement generators (same PN) manufactured in Lenexa cannot be ordered due to 

limited production capability. Instructions for this replacement are given in AMM task “Ref.5 

and 6”.

If an operator has generators PN 117042-XX in stock, and less than 10 years old, they may be used 

as well.

Note: The oxygen generator P/N 117042-XX is installed on the following containers: 

Type I container P/Ns: G1L/RXXX-XX; W1L/RXXX-XX; E1L/RXXX-XX 

Type II container P/Ns: G2F/NXXX-XX; E2F/NXXX-XX 

Type III container P/Ns: G3NXXX-XX; W3NXXX-XX; E3NXXX-XX 

In addition, the oxygen generator PN 117042-XX can also be fitted on containers A1, AA, AB, AH, AJseries (initially fitted with generator PN 117019-XX) and on containers AE, AF-series (initially fitted with 

generator PN 117028-XX). If a generator PN 117042-XX is found installed on one of these container 

series, new generators PN 117019-XX and PN 117028-XX can be delivered by B/E Aerospace.

Airbus highly recommend Operators not to wait until the due date before ordering the new generators.

This recommendation is especially valid when ordering full containers due to the longer manufacturing 

time.

**END REV**

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

vendor SIL D1019-01) and requires to record for each generator the PN, the date of manufacture, the lot 
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code and whether or not the chemical reaction worked properly. The template to report the activation 

results is provided in the appendix A of this AOT. This feedback from the operators is necessary for 

supporting the on-going investigation, it will allow to determine the extent of this issue and it will help to 

define if further actions for continued airworthiness are necessary.

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/MRBR 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/MRBR requirements and in any case not later than December 2015 

whichever occurs first.

**BEG. REV**

New requirements of this AOT revision 01:

Replacement of all oxygen generators PN 117042-XX must be done before exceeding 10 years since 

date of manufacture or within the compliance time specified in Table 1, whichever occurs later.

Table 1 - Replacement of Passenger Oxygen Generators

Year of manufacture

Compliance Time

(starting from the publication date of 

this AOT)

2002 Within 12 months

2003 Within 16 months

2004 Within 20 months

2005 Within 24 months

2006 Within 28 months

2007 Within 32 months

2008 Within 36 months

For generators manufactured after 2008, they will have to be replaced before being older than 10 years 

since date of manufacture.

**END REV**
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4.2 DESCRIPTION

For 15 min generators (PN 117042-0X), please refer to AMM tasks “Ref. 3, 4, 5 and 6” and to B/E 

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

**BEG. REV**

For 22 min generators (PN 117042-2X), please refer to the AMM task “Ref. 5 and 6”.

If an operator has generators PN 117042-XX in stock, and less than 10 years old, they may be used 

as well.

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

Information Letter (RIL LR35M14028324 Rev01).

**END REV**

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

**BEG. REV**

Airbus have currently not received any failure report on generators less than 10 years old. However, in 

order to investigate further this potential premature ageing, a sampling test on these generators 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.

**END REV**

5.2 IMPACTED DOCUMENTATION

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 

leads 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.

It is anticipated that this AOT will be mandated by the issuance of an EASA Airworthiness Directive.
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7. REPORTING

**BEG. REV**

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

Services engineering as soon as possible, after the AOT application, through TechRequest on Airbus 

World, selecting Engineering Domain and ATA 35-20.

**END REV**

Best Regards,

Jean-Luc MOUYSSET

VICE PRESIDENT ENGINEERING SUPPORT

CUSTOMER SERVICES

Sabine KLAUKE 

VICE PRESIDENT A330/A340 PROGRAMME

CUSTOMER SERVICES