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- Airbus
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- Alert Operators Transmission
- Number
- A71L012-16
- Latest revision known
- A71L012-16, Revision 01, dated February 24, 2017
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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: A71L012-16 Rev 01 Page 1 of 6 Date: 24-FEB-2017 © AIRBUS S.A.S. 2017. ALL RIGHTS RESERVED. CONFIDENTIAL AND PROPRIETARY DOCUMENT SUBJECT: ATA 71 – A330-Trent 700-Green Hydraulic Damper limited Life AIRCRAFT TYPE: A330 OUR REF.: A71L012-16 Rev 01 dated 24-FEB-2017.
OUR PREVIOUS REF.: A71L012-16 Rev 00 dated 22-DEC-2016.
0. REASON FOR REVISION Following in-service damper failures below the limitation of 775FC, it has been decided to introduce an improved ripple damper PN AE711121-18 Rev A. This revision is to inform about this PN embodiment.
The limitation of 800FC (775FC plus 25FC of grace period which becomes included) remains valid for PN AE711121-18 Rev A.
1. AIRCRAFT AFFECTED Airbus A330 equipped with Trent 700 fitted with Post-Modification Rolls Royce Service Bulletin 73- AJ366 (Airbus MOD 205242 / MP S33321).
2. REFERENCED DOCUMENTATION Rolls Royce Non-Modification Service Bulletin (NMSB) 29-AJ472 Rev. 0 (released on Dec. 2016) and 29-AJ696 Rev. 0 (released on Feb 2017) and latest issues.
2.1 APPENDIX None
2.2 REFERENCES 01- Rolls Royce NMSB 29-AJ696 Rev. 0 released on Feb. 2017 and latest issues 02- Rolls Royce NMSB 29-AJ472 Rev. 0 released on Dec. 2016 and latest issues 03- Rolls Royce SB 73-AJ366 Rev. 0 released on May 2016 and latest issues 04- EASA Airworthiness Directive 2016-0120 05- TFU 73.11.00.059 A330 Trent 700 – Hydraulic Damper Limited Life 06- Airbus AOT A71L012-16 Rev 00 07- AMM task 71-00-00-720-828-A Dry Motoring Engine 08- AMM TASK 29-11-00-710-801 Operational test of the Green hydraulic system 09- Airbus Modification 205242 10- Airbus Modification 206979
ALERT OPERATORS TRANSMISSION - AOT AOT ref: A71L012-16 Rev 01 Page 2 of 6 Date: 24-FEB-2017 © AIRBUS S.A.S. 2017. ALL RIGHTS RESERVED. CONFIDENTIAL AND PROPRIETARY DOCUMENT
3. REASON Following implementation of Airbus Modification 205242 (Ref-09) (covering Rolls Royce SB 73-AJ366 (Ref-03) for Production aircrafts), mandated by EASA Airworthiness Directive 2016-0120 (Ref-04), a new integrated ripple damper was introduced within hydraulic pressure tube assembly (PN AE711121-
18).
AOT A71L012-16 Rev 00 (Ref-06) was issued due to cases of hydraulic ripple damper weld cracking on PN AE711121-18 which can lead to hydraulic leakage and may result in loss of the green hydraulic system. To mitigate against this failure mode, a limitation of 775 flight cycles was defined on the hydraulic pressure tube assembly PN AE711121-18 per Rolls Royce NMSB 29-AJ472 (Ref-02) and AOT A71L012-16 Rev 00 (Ref-06).
Following the issuance of the initial revision of the AOT, additional in-service damper failures on PN AE711121-18) were identified on parts not having reached the limit of 775FC. A new Hydraulic ripple damper assembly, PN AE711121-18 Rev A has been introduced [Airbus Mod 206979 (Ref-10)]. The difference being that the hydraulic ripple damper AE711121-18 is single welded at sphere joint area compared to the new one AE711121-18 Rev A which is double welded.
This solution has demonstrated significant additional margin against failure over the different tests performed.
The double weld damper PN AE711121-18 Rev A remains an interim fix for which the 800FC limitation (775FC plus 25FC of grace period included) remains applicable.
3.1 FACTS Only Post-Modification engines [Airbus Mod 205242 (Ref-09) for production aircraft and Rolls Royce SB 73-AJ366 (Ref-03)] are affected by this communication. The Pre-Modification engines are not concerned.
3.2 CONSEQUENCES The hydraulic ripple damper failure mode is a leakage through welding crack. Such leakage could result in the loss of Green hydraulic system.
3.3 AIM The aim of this AOT revision 01 is to instruct operators to replace PN AE711121-18 by PN AE711121- 18 Rev A as per Rolls Royce NMSB 29-AJ696 (Ref-01) and to implement the limitation of 800 Flight Cycles as per Rolls Royce NMSB 29-AJ472 (Ref-02).
Clearing the fleet of PN AE711121-18 has to be done before 5 months further AOT issuance.
3.4 INVESTIGATION Final fix is under development.
ALERT OPERATORS TRANSMISSION - AOT AOT ref: A71L012-16 Rev 01 Page 3 of 6 Date: 24-FEB-2017 © AIRBUS S.A.S. 2017. ALL RIGHTS RESERVED. CONFIDENTIAL AND PROPRIETARY DOCUMENT
4. SHORT TERM ACTION Replace the green hydraulic pressure tube PN AE711121-18 by PN AE711121-18 Rev. A and maintain a limit of 800FC.
This action is only considered as mitigation. A final solution is still under review through Modification process to fix the issue.
4.1 PLANNING AND MANPOWER
4.1.1 ACCOMPLISHMENT TIMESCALE At next opportunity, within 15 days after issuance of this AOT, identify the hydraulic ripple damper that is installed on both engines.
- If PN AE711121-18 is installed, plan the replacement by PN AE711121-18 Rev A before reaching the limit of 800FC or before 5 months after AOT issuance whichever occurs first.
- If PN AE711121-18 Rev A is installed, plan the replacement by PN AE711121-18 Rev A before reaching the limit of 800FC.
Repeat this check of configuration at each damper replacement or engine change.
The 800FC limitation is repetitive and valid until implementation of a final fix to be defined by RR.
Removed parts have to be tagged as unserviceable and scrapped.
ALERT OPERATORS TRANSMISSION - AOT AOT ref: A71L012-16 Rev 01 Page 4 of 6 Date: 24-FEB-2017 © AIRBUS S.A.S. 2017. ALL RIGHTS RESERVED. CONFIDENTIAL AND PROPRIETARY DOCUMENT WITHIN 15 days
AFTER AOT ISSUANCE
Check P/N Damper P/N AE711121-18 (single weld) Schedule replacement of damper with PN AE711121-18 REV A (double weld) as per RR NMSB 29-AJ696:
By 5 months after AOT issuance OR before damper reaches 800 FC since first installation on an engine whichever occurs first Damper P/N AE711121-18 REV A (double weld) Repeat action at each damper or Engine replacement
CHECK DAMPER
CONFIGURATON
Schedule replacement of damper with P/N AE711121-18 REV A (double weld):
Before damper reaches 800 FC since first installation on an engine For specific cases of damper PN AE711121-18 failure would occur within 5 months after AOT issuance (below of 800FC limit) and considering that no spares PN AE711121-18 Rev A could be provided on time (due to industrial constraints), it is accepted to install exceptionally PN AE711121-18 for supporting aircraft operations. The 5 months after AOT issuance compliance limit and the 800FC repetitive limit remains valid.
4.1.2 MANPOWER The estimated time to replace the hydraulic pressure tube assembly PN AE711121-18 (or AE711121-18 Rev A) on-wing is 3.5 hours.
4.2 DESCRIPTION
ALERT OPERATORS TRANSMISSION - AOT AOT ref: A71L012-16 Rev 01 Page 5 of 6 Date: 24-FEB-2017 © AIRBUS S.A.S. 2017. ALL RIGHTS RESERVED. CONFIDENTIAL AND PROPRIETARY DOCUMENT Refer to Rolls Royce NMSB 29-AJ696 & 29-AJ472 latest issues.
4.2.1 ACCESS Refer to Rolls Royce NMSB 29-AJ696 & 29-AJ472 latest issues.
4.2.2 REPLACEMENT REQUIREMENTS Comply with Rolls Royce NMSB 29-AJ696 & 29-AJ472 for damper replacement instructions and life limitation.
Do the operational test of the Green hydraulic system (Ref. AMM TASK 29-11-00-710-801) (Ref-08).
During the dry motoring (Ref-07), make sure that there are no leaks from the hydraulic connections.
After test completion, check if that the Green reservoir level is correct, add fluid if necessary (Ref. AMM TASK 12-12-29-611-801 or 12-12-29-611-802)
4.2.3 FINDINGS In case of findings, please inform Airbus.
4.3 SPARES AND TOOLING Please refer to Rolls Royce NMSB 29-AJ696 & 29-AJ472 latest issues and address any spare concern with your Rolls Royce AST.
5. FURTHER INFORMATION
5.1 FOLLOW-UP PLAN Definition of terminating action to this repetitive action is on-going.
Updates will be provided through TFU reference 73.51.00.059 – A330 Trent 700 Hydraulic damper limited life (Ref-05) and during Rolls Royce Customer Focus Group Calls.
5.2 IMPACTED DOCUMENTATION None
6. AOT APPROVAL The technical content of this document is approved under the authority of DOA nr. EASA.21J.031.
Rolls Royce NMSB 29-AJ696 (Ref-01) & 29-AJ472 (Ref-02) and/or this Airbus AOT are expected to be mandated by EASA.
7. REPORTING
ALERT OPERATORS TRANSMISSION - AOT AOT ref: A71L012-16 Rev 01 Page 6 of 6 Date: 24-FEB-2017 © AIRBUS S.A.S. 2017. ALL RIGHTS RESERVED. CONFIDENTIAL AND PROPRIETARY DOCUMENT Questions about this AOT are to be addressed to Airbus Customer Services through TechRequest on Airbus World, selecting Engineering Domain, Engineering Support Section and ATA 71-00 /Topic A330-T700 Hydraulic Damper limited life.
As per latest reporting policy (Ref to OIT 999.0018/16), inspection results (with or without findings) are to be addressed to Airbus Customer Services through the generic e-mail address:
inspection.results@airbus.com.
Best Regards, Jean-Luc MOUYSSET
VICE PRESIDENT ENGINEERING SUPPORT
CUSTOMER SERVICES Sabine KLAUKE VICE PRESIDENT A330 PROGRAMME