CUSTOMER SERVICES DIRECTO RATE

1 ROND POINT MAURICE BELLONTE 31707 BLAGNAC CEDEX FRANCE TELEPHONE + 33 (0)5 61 93 33 33 

# ALERT OPERATORS TRANSMISSION

- AOT

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© 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 rev ision 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 **BE G. 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 detail s:

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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© AIRBUS S.A.S. 2014 . ALL RIGHTS RESERVED. CONFIDENTIAL AND PROPRIETARY DOCUMENT 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 betwe en 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 genera tors 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 dispos al. 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 p roducing 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 1 5 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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© AIRBUS S.A.S. 2014 . ALL RIGHTS RESERVED. CONFIDENTIAL AND PROPRIETARY DOCUMENT 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 ge nerator 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 gene rators (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 capabi lity. 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 o n co ntainers A1, AA, AB, AH, AJ

series (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 generator s 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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© AIRBUS S.A.S. 2014 . ALL RIGHTS RESERVED. CONFIDENTIAL AND PROPRIETARY DOCUMENT 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 wi ll 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 m ust 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 don e 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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© AIRBUS S.A.S. 2014 . ALL RIGHTS RESERVED. CONFIDENTIAL AND PROPRIETARY DOCUMENT 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, asse mbly 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 A IRBUS 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 re sults 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 delive red 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 accor dingly.

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

Best Regards,

Jean

- Luc MOUYSSET VICE PRESIDENT ENGINEERING SUPPORT CUSTOMER SERVICES Sabine KLAUKE VICE PRESIDENT A330/A340 PROGRAMME CUSTOMER SERVICES