# @A340-500/600 SERVICE BULLETIN SUMMARY AIRBUS CUSTOMER SERVICES DIRECTORATE 1 Rond Point Maurice Bellonte 31707 BLAGNAC CEDEX FRANCE Tel : (33) 5 61 93 33 33 Telex : AIRBU 530526F Fax : (33) 5 61 93 42 51 This summary is for information only and is not approved for modification of the aircraft. 

# MANDATORY MANDATORY MANDATORY
ATA SYSTEM: 32 

### TITLE: LANDING GEAR - NOSE G EAR - DRAG STAY LOWER ARM CORROSION PREVENTION **CONF ALL MODIFICATIONS MODIFICATION CLASSIFICATION MAJOR 200785H16415 MINOR None NOTE : As per EASA IR 21, a minor change is one that has no appreciable effect on the mass, balance, structural strength, reliability, operational characteristics affecting the airworthiness of the product. All other changes are major changes. REASON/DESCRIPTION/OPERATIONAL CONSEQUENCES Corrosion has been discovered on the lower drag stay arm when rust traces were noticed in the vicinity of both ends of the lower arm lug bores. The discovery of one case prompted visual inspection of all the other aircraft owned by the operator concerned. Post drag stay removal, sealant has been reported damaged between the lug bore and the bearing race, on disassembly pitting corrosion and rust traces have been reported on the internal surface of the lug bore. To date eleven lower drag stay arms on A340-500/-600 aircraft have exhibited corrosion in the upper and/or lower bores. This Service Bulletin is published to advise all operators of A340-500/-600 aircraft of the issue of Messier-Dowty Service Bulletin No. A34/56N-32-113. Due to the nature of the failure of the A340-500/-600 lower drag stay arm and the relatively widespread occurrence of the corrosion throughout the A340-500/-600 fleet, a modification is required to eliminate the root cause of the corrosion on Weight Variant (WV) 001, 002, 003 and 004 aircraft. This Service Bulletin introduces a modification to the lower drag stay arm in order to prevent corrosion. The 300M steel lower drag stay arm interface with the 17-4PH steel bearing race is modified in order to prevent corrosion from developing at this joint. Four key aspects to the modification exist:

DATE: Oct 20/10 SERVICE BULLETIN No.: A340-32-5101 REVISION No.: 00 - Oct 20/10 Page: 1 7

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# @A340-500/600 SERVICE BULLETIN SUMMARY - The thickness of the sealant bead applied externally is specified and increased in order to prevent the ingress of contaminants - The sealant applied between the lug and the race is changed from a fully polymerizing Nickel containing compound to Molykote DX with Zinc (a part curing compound), this reduces the friction in the joint helping to prevent cadmium damage caused by micro-displacements and removes the Nickel present that can react with and deplete Cadmium leading to damage. - The lug internal diameter tolerance is modified from 152H7 to 152G7. - The thickness of the Cadmium in the bore is modified in order to ensure that the sacrificial protection provided by the Cadmium is maximized. Accomplishment of this Service Bulletin cancels the inspection requirements of Service Bulletin A340-32-5099. GENERAL EVALUATION EVALUATION TABLE COMPLIANCE MANDATORY (1) CANCELS INSPECTION SB YES POTENTIAL AD YES A/C OPERATION AFFECTED NO RELIABILITY AFFECTED NO PAX COMFORT AFFECTED NO COST SAVING NO LROPS AFFECTED NO STRUCTURAL LIFE EXTN NO VENDOR SB INVOLVED YES AIRCRAFT NOSE JACKING YES NOTE (1) : Service Bulletin must be accomplished. MATERIAL PRICE INFORMATION No Material EFFECTIVITY This Service Bulletin is applicable to this (these) operator(s) :

CES CHH DLH ETD IBE QAF SAA SIA TAM THA UAE VIR CONCURRENT REQUIREMENTS None REFERENCES / REPERCUSSIONS TFU 32.21.16.001 OEB None AOT None SIL None LINE MAINTENANCE AFFECTED No LIFE LIMIT None OTHER None

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# @A340-500/600 SERVICE BULLETIN SUMMARY NATURE OF THE WORK AIRCRAFT YES EQUIPMENT YES HARD NO SOFT NO OBRM NO MANPOWER Task 325101-831-895-001: MODIFICATION TOTAL MANHOURS 7.00 ELAPSED TIME (HOURS) 3.00 Additional manhours related to Vendor SB; refer to: NLG DRAG STAY LOWER ARM MODIFICATION OR REPLACEMENT MESSIER-DOWTY Service Bulletin No. A34/56N-32-113 NLG REIDENTIFICATION MESSIER-DOWTY Service Bulletin No. A34/56N-32-113 APPENDICES None

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# @A340-500/600 SERVICE BULLETIN SUMMARY

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# @A340-500/600 SERVICE BULLETIN

AIRBUS CUSTOMER SERVICES DIRECTORATE 1 Rond Point Maurice Bellonte 31707 BLAGNAC CEDEX FRANCE Tel : (33) 5 61 93 33 33 Telex : AIRBU 530526F Fax : (33) 5 61 93 42 51



# MANDATORY MANDATORY MANDATORY
ATA SYSTEM: 32 

### TITLE: LANDING GEAR - NOSE G EAR - DRAG STAY LOWER ARM CORROSION PREVENTION MODIFICATION No.: 200785H16415 This document contains AIRBUS PROPRIETARY INFORMATION and shall at all times remain the property of AIRBUS; no intellectual property right or licence is granted by AIRBUS in connection with any information contained in it. It is delivered on the express condition that said document and the information contained in it shall be treated as confidential, shall not be used for any purpose other than that for which it is hereby delivered. It shall not be disclosed in whole or in part to third parties and shall not be duplicated in any manner (except for the purposes of performing the tasks described hereunder and provided that any recipient of such document shall comply with the conditions herein), without AIRBUS prior written consent. 1. PLANNING INFORMATION **CONF ALL A. EFFECTIVITY (1) Models 340-541 340-642 (2) Effectivity by MSN 0371 0376 0383 0391 0394 0410 0416-0417 0426 0431 0436 0440 0445 0449 0453 0457 0460 0464 0468 0471 0475 0478 0482 0485 0488 0492 0495 0499 0514 0517 0520 0523 0531 0534 0537 0540 0543 0547 0557 0560 0563 0566 0569 0572 0575 0577 0580 0583 0586 0601 0604 0606 0608 0611 0615 0617 0619 0622 0624 0626 0628 0630 0639 0672 0677 0681 0685 0689 0694 0698 0702 0706 0710 0719 0723 0727 0736 0744 0748 0753 0757 0761 0764-0765 0768 0783 0787 (3) Effectivity by Operator The Operator/MSN relationship is provided for information only and is correct at the time of issue in accordance with the information available to AIRBUS. Any future changes resulting from transfer of an aircraft from one operator to another will not be reflected in this list unless the Service Bulletin is revised for another reason.

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# @A340-500/600 SERVICE BULLETIN

OPERATOR MSN CES 0468 0488 0514 0577 0586 CHH 0436 0453 0475 DLH 0482 0517 0523 0537 0540 0543 0566 0569 0580 0583 ETD 0748 0757 0761 0783 IBE 0431 0440 0460 0601 0604 0606 0617 0619 0672 0702 0727 0744 QAF 0495 SAA 0410 0417 0426 0531 0534 0547 0557 0626 0630 SIA 0478 0492 0499 0560 0563 TAM 0445 0464 THA 0624 0628 0677 0681 0689 0698 0710 0719 UAE 0394 0457 0471 0485 0520 0572 0608 0611 0685 0694 VIR 0371 0376 0383 0391 0416 0449 0575 0615 0622 0639 0706 0723 0736 0753 0764 0765 0768 0787 (4) Configuration by MSN MSN CONFIGURATION 0371 0376 0383 0391 0394 0410 0416 0417 0426 0431 0436 0440 0445 0449 0453 0457 0460 0464 0468 0471 0475 0478 0482 0485 0488 0492 0495 0499 0514 0517 0520 0523 0531 0534 0537 0540 0543 0547 0557 0560 0563 0566 0569 0572 0575 0577 0580 0583 0586 0601 0604 0606 0608 0611 0615 0617 0619 0622 0624 0626 0628 0630 0639 0672 0677 0681 0685 0689 0694 0698 0702 0706 0710 0719 0723 0727 0736 0744 0748 0753 0757 0761 0764 0765 0768 0783 0787 001

(5) Configuration definition **CONF 001 Config. 01, is valid for all the aircraft given in the effectivity of this Service Bulletin as a standard configuration. (6) Material Effectivity MATERIAL QTY PER A/C SEE NOTES Reidentified part set REIDB01 1 Refer to MESSIER-DOWTY Service Bulletin A34/56N-32-113. B. CONCURRENT REQUIREMENTS None

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# @A340-500/600 SERVICE BULLETIN

C. REASON (1) History Corrosion has been discovered on the lower drag stay arm when rust traces were noticed in the vicinity of both ends of the lower arm lug bores. The discovery of one case prompted visual inspection of all the other aircraft owned by the operator concerned. Post drag stay removal, sealant has been reported damaged between the lug bore and the bearing race, on disassembly pitting corrosion and rust traces have been reported on the internal surface of the lug bore. To date eleven lower drag stay arms on A340-500/-600 aircraft have exhibited corrosion in the upper and/or lower bores. (2) Objective/Action This Service Bulletin is published to advise all operators of A340-500/-600 aircraft of the issue of Messier-Dowty Service Bulletin No. A34/56N-32-113. Due to the nature of the failure of the A340-500/-600 lower drag stay arm and the relatively widespread occurrence of the corrosion throughout the A340-500/-600 fleet, a modification is required to eliminate the root cause of the corrosion on Weight Variant (WV) 001, 002, 003 and 004 aircraft. (3) Advantages This Service Bulletin introduces a modification to the lower drag stay arm in order to prevent corrosion. The 300M steel lower drag stay arm interface with the 17-4PH steel bearing race is modified in order to prevent corrosion from developing at this joint. Four key aspects to the modification exist: - The thickness of the sealant bead applied externally is specified and increased in order to prevent the ingress of contaminants - The sealant applied between the lug and the race is changed from a fully polymerizing Nickel containing compound to Molykote DX with Zinc (a part curing compound), this reduces the friction in the joint helping to prevent cadmium damage caused by micro-displacements and removes the Nickel present that can react with and deplete Cadmium leading to damage. - The lug internal diameter tolerance is modified from 152H7 to 152G7. - The thickness of the Cadmium in the bore is modified in order to ensure that the sacrificial protection provided by the Cadmium is maximized. Accomplishment of this Service Bulletin cancels the inspection requirements of Service Bulletin A340-32-5099. (4) Operational/Maintenance Consequences None

DATE: Oct 20/10 SERVICE BULLETIN No.: A340-32-5101 REVISION No.: 00 - Oct 20/10 Page: 3 7

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# @A340-500/600 SERVICE BULLETIN

D. DESCRIPTION To accomplish this Service Bulletin it is necessary to : Task 325101-831-895-001: MODIFICATION (1) REMOVE DRAG STAY LOWER ARM (2) NLG DRAG STAY LOWER ARM MODIFICATION OR REPLACEMENT (3) INSTALL DRAG STAY LOWER ARM (4) NLG REIDENTIFICATION E. COMPLIANCE (1) Classification MANDATORY: Service Bulletin must be accomplished. (2) Accomplishment Timescale Accomplishment of this Service Bulletin has been rendered mandatory by the issue of an Airworthiness Directive (AD) published by the European Aviation Safety Agency ( EASA). The AD must be used as the reference document for the mandatory accomplishment timescale. F. APPROVAL Approved under EASA Design Organisation Approval No. EASA 21J.031. If an aircraft listed in the effectivity has a modification or repair embodied that is not of AIRBUS origin, and which affects the content of this Service Bulletin, the operator is responsible for obtaining approval by its airworthiness authority for any adaptation necessary before incorporation of the Service Bulletin. G. MANPOWER The manpower estimates given in this Service Bulletin are based on the direct labor cost to do the work. These estimates assume that the work will be done by experienced personnel, and may need to be revised upwards to suit operator’s circumstances. The estimates do not include the time to prepare, plan or inspect the work. Manufacture and procurement of parts and tools, drying times for paints, sealants, etc., and general administration work are also not included. Task 325101-831-895-001: MODIFICATION Get Access 1.00 On Aircraft REMOVE DRAG STAY LOWER ARM 2.00 INSTALL DRAG STAY LOWER ARM 2.00 Tests 1.00 Close-Up 1.00 TOTAL MANHOURS 7.00 DATE: Oct 20/10 SERVICE BULLETIN No.: A340-32-5101 REVISION No.: 00 - Oct 20/10 Page: 4 7

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# @A340-500/600 SERVICE BULLETIN

Task 325101-831-895-001: MODIFICATION ELAPSED TIME (HOURS) 3.00 Additional manhours related to Vendor SB; refer to: NLG DRAG STAY LOWER ARM MODIFICATION OR REPLACEMENT MESSIER-DOWTY Service Bulletin No. A34/56N-32-113 NLG REIDENTIFICATION MESSIER-DOWTY Service Bulletin No. A34/56N-32-113 H. WEIGHT AND BALANCE None I. ELECTRICAL LOAD DATA None J. REFERENCES

Aircraft Maintenance Manual (AMM) 07-11-00 12-34-24 29-00-00 32-00-00 32-21-19 32-31-00 32-33-00 32-51-00 Elec. Std. Practices Manual (ESPM) 20-55-00 Vendor Service B ulletin (VSB) MESSIER-DOWTY Service Bulletin No. A34/56N-32-113 K. PUBLICATION AFFECTED Airworthiness Limitation Section (ALS) Part 1 Illustrated Parts Catalog (IPC) 32-21-11 L. INTERCHANGEABILITY/MIXABILITY Refer to MESSIER-DOWTY Service Bulletin A34/56N-32-113 for Interchangeability/Mixability. NOTE : The ICY code is 351 - Not interchangeable but one way interchangeable under the following conditions: 30-1018076-00 can replace 30-1018002-01 on A340-500/600 WV 00X aircraft, only if 30-1018076-00 is never removed and replaced with a 30-1018002-01. M. SPARES None

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# @A340-500/600 SERVICE BULLETIN

2. MATERIAL INFORMATION **CONF ALL A. MATERIAL - PRICE AND AVAILABILITY (1) Procurement Addresses Modification of removed equipment should be negotiated directly with MESSIER-DOWTY as per instructions given in Service Bulletin No. A34/56N-32-113. (2) Price and Availability Refer to MESSIER-DOWTY Service Bulletin A34/56N-32-113 for the equipment modification sales terms. B. INDUSTRY SUPPORT INFORMATION Refer to the MESSIER-DOWTY Service Bulletin (A34/56N-32-113) for the i ndustry support terms. C. LIST OF COMPONENTS Refer to MESSIER-DOWTY Service Bulletin A34/56N-32-113. D. LIST OF MATERIALS - OPERATOR SUPPLIED None E. PARTS TO BE RE-IDENTIFIED BY OPERATOR Refer to MESSIER-DOWTY Service Bulletin A34/56N-32-113. F. TOOLING (1) Tooling - Price and Availability None (2) Tools To accomplish this Service Bulletin it will be necessary to use the tools as specified in MESSIER-DOWTY Service Bulletin A34/56N-32-113. (3) Special Tools To accomplish this Service Bulletin it will be necessary to use the tools as specified in MESSIER-DOWTY Service Bulletin A34/56N-32-113.

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# @A340-500/600 SERVICE BULLETIN

3. ACCOMPLISHMENT INSTRUCTIONS Task 325101-831-895-001 - MODIFICATION WARNING : MAKE SURE THAT YOU OBEY ALL THE WARNINGS AND ALL THE CAUTIONS INCLUDED IN THE REFERENCED PROCEDURES. CAUTION : ALWAYS OBEY THE PRECAUTIONS THAT FOLLOW TO KEEP ELECTRICAL WIRING IN A SATISFACTORY CONDITION (ELECTRICALLY AND MECHANICALLY SERVICEABLE) . WHEN YOU DO MAINTENANCE WORK, REPAIRS OR MODIFICATIONS, ALWAYS KEEP ELECTRICAL WIRING, COMPONENTS AND THE WORK AREA AS CLEAN AS POSSIBLE. TO DO THIS: - PUT PROTECTION, SUCH AS PLASTIC SHEETING, CLOTHS, ETC; AS NECESSARY ON WIRING AND COMPONENTS - REGULARLY REMOVE ALL SHAVINGS, UNWANTED MATERIAL AND OTHER CONTAMINATION. THESE PRECAUTIONS WILL DECREASE THE RISK OF CONTAMINATION AND DAMAGE TO THE ELECTRICAL WIRING INSTALLATION. IF THERE IS CONTAMINATION, REFER TO ESPM 20-55-00, CLEANING. Task Associated Data Manpower TOTAL MANHOURS 7.00 ELAPSED TIME (HOURS) 3.00 Additional manhours related to Vendor SB; refer to: MESSIER-DOWTY Service Bulletin No. A34/56N-32-113 A. GENERAL (1) Subtask 325101-910-401-001 - STANDARD PRACTICES Manpower Resources Skills AIRFRAME (a) Put blanking caps on all disconnected line ends. (b) Put blanking caps on all disconnected connectors. (2) Subtask 325101-839-401-001 - ADMINISTRATIVE Manpower Resources Skills AIRFRAME Write in the applicable aircraft records that you have done all the work given in this Service Bulletin.

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# @A340-500/600 SERVICE BULLETIN

B. PREPARATION (1) Subtask 325101-940-401-001 - JOB SET-UP References Aircraft Maintenance Manual (AMM) Task 07-11-00-581-802 Task 12-34-24-860-802 Task 29-00-00-864-804 Task 29-00-00-864-804 Task 32-00-00-481-801 Task 32-51-00-040-801 Vendor Service B ulletin (VSB) MESSIER-DOWTY A34/56N-32-113 (a) If the following strike positions (on the Nose Landing Gear (NLG) leg nameplate) are marked: - - 31 (on the 10-100201 series NLG leg) (Refer to MESSIER-DOWTY Service Bulletin No. A34/56N-32-113). - - 17 (on the 10-100203 series NLG leg) (Refer to MESSIER-DOWTY Service Bulletin No. A34/56N-32-113). go to SUBTASK 325101-942-401 001 CLOSE-UP (b) If the following strike positions (on the Nose Landing Gear (NLG) leg nameplate) are NOT marked: - - 31 (on the 10-100201 series NLG leg) (Refer to MESSIER-DOWTY Service Bulletin No. A34/56N-32-113). - - 17 (on the 10-100203 series NLG leg) (Refer to MESSIER-DOWTY Service Bulletin No. A34/56N-32-113). complete all the worksteps that follow. (c) Make sure that the aircraft is electrically grounded for maintenance operations (Refer to AMM Task 12-34-24-860-802). (d) Make sure that the safety devices are installed on the NLG (Refer to AMM Task 32-00-00-481-801). (e) Do the deactivation of the Nose Wheel Steering (NWS) procedure (Refer to AMM Task 32-51-00-040-801). (f) Lift the forward end of the aircraft on jacks until the nose wheels are off the ground (Refer to AMM Task 07-11-00-581-802). (g) Make sure that the Green hydraulic system is depressu rised (Refer to AMM Task 29-00-00-864-804).

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# @A340-500/600 SERVICE BULLETIN

C. PROCEDURE (1) Subtask 325101-020-402-001 - REMOVE DRAG STAY LOWER ARM Manpower Resources Manhours 2.00 Minimum number of person 2 Subtask elapsed time 1.00 Skills AIRFRAME References Aircraft Maintenance Manual (AMM) Task 32-21-19-000-801 (a) Remove the NLG Drag Stay Lower Arm pn 30-1018002-01 (Refer to AMM Task 32-21-19-000-801). (2) Subtask 325101-831-401-001 - NLG DRAG STAY LOWER ARM MODIFICATION OR REPLACEMENT References Vendor Service B ulletin (VSB) MESSIER-DOWTY A34/56N-32-113 (a) Modify or replace the NLG Drag Stay Lower Arm (Refer to MESSIER-DOWTY Service Bulletin No. A34/56N-32-113). (3) Subtask 325101-420-401-001 - INSTALL DRAG STAY LOWER ARM Manpower Resources Manhours 2.00 Minimum number of person 2 Subtask elapsed time 1.00 Skills AIRFRAME References Aircraft Maintenance Manual (AMM) Task 32-21-19-400-801 (a) Install the NLG Drag Stay Lower Arm pn 30-1018076-00 (Refer to AMM Task 32-21-19-400-801). (4) Subtask 325101-930-401-001 - NLG REIDENTIFICATION References Vendor Service B ulletin (VSB) MESSIER-DOWTY A34/56N-32-113 (a) Reidentify the NLG refer to MESSIER-DOWTY Service Bulletin No. A34/56N-32-113.

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# @A340-500/600 SERVICE BULLETIN

D. TEST (1) Subtask 325101-710-401-001 - NLG TEST Manpower Resources Skills AIRFRAME References Aircraft Maintenance Manual (AMM) Task 32-31-00-710-807 Task 32-33-00-710-808 Task 32-51-00-440-801 (a) Do the Reactivation of the Nose Wheel Steering (NWS) procedure (Refer to AMM Task 32-51-00-440-801). (b) Do an operational test of the NLG normal extension and retraction (Refer to AMM Task 32-31-00-710-807). (c) Do an operational test of the NLG free-fall extension (Refer to AMM Task 32-33-00-710-808). E. CLOSE-UP (1) Subtask 325101-942-401-001 - CLOSE-UP Manpower Resources Skills AIRFRAME References Aircraft Maintenance Manual (AMM) Task 07-11-00-586-802 (a) Make sure that the work area is clean and clear of tools and other items of equipment. (b) Lower the aircraft and remove the jacks (Refer to AMM Task 07-11-00-586-802).

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# @A340-500/600 SERVICE BULLETIN REPORTING SHEET 

### TITLE: LANDING GEAR - NOSE G EAR - DRAG STAY LOWER ARM CORROSION PREVENTION MODIFICATION No.: 200785H16415 Please complete the appropriate item (A or B): A - SB WILL BE embodied YES/NO (if NO please comment) If YES, aircraft concerned (as per SB effectivity by default) and planned dates (month/year) of embodiment:

B - SB HAS BEEN embodied on aircraft: Operator comments:

From Airline: Name/Title: Signature: Date: If operational documentation is affected (see Paragraph 1.K of this SB): If information is needed prior to next normal revision or prior to SB embodiment, please indicate required service(s): Either: Modification Operational Impact (MOI), if available YES/NO Or : Intermediate revision YES/NO Important Information: This SB will only be incorporated in your maintenance and operational documentation if this sheet is returned to Airbus and signed by a duly authorised representative. With the next feasible revision, this will result in - Updating of maintenance documentation to show pre and post SB data. - Updating of maintenance and operational documentation to show post SB data after embodiment. If this SB requires previous or simultaneous accomplishment of other SBs, Airbus shall automatically include them in the manual revisions. Refer to SIL 00-037 for detailed information. Please return this completed sheet to: AIRBUS CUSTOMER SERVICES DIRECTORATE 1 Rond Point Maurice Bellonte 31707 BLAGNAC CEDEX FRANCE Attn: SDC32 Technical Data and Documentation Services FAX: (+33) 5 61 93 28 06 e-mail: sb.reporting@airbus.com or via your Resident Customer Support Office. Alternatively, SB lists via letters or fax are also accepted.

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# @A340-500/600 SERVICE BULLETIN QUALITY PERCEPTION FORM Use this form to tell us what is your perception of the quality of this Service Bulletin. The reported data that you provide us will be used to analyse areas of difficulties and to take corrective action to further improve the quality of our Service Bulletins. We thank you for the time you have taken in completing this form. (Please rate on a scale of 1 to 4, with 4 being the highest score) - Quality rating of this SB 4 3 2 1 - Quality rating of the Accomplishment Instructions 4 3 2 1 - Quality rating of the Illustrations 4 3 2 1 - Is this SB easy to understand ? Y / N If you have had difficulties in the accomplishment of this SB please quote below the area(s) and give a short description of the issue. Planning Material Instructions X Effectivity X Kit content X Preparation X Reason X List of Materials Operator Supplied X Mod/Inspection X Manpower X Industry support X Test X References X Re-identification X Close-Up X Publication X Tooling X Illustrations Comments:

Operator: Date: Name/Title: Please return this form to: AIRBUS CUSTOMER SERVICES DIRECTORATE 1 Rond Point Maurice Bellonte 31707 BLAGNAC CEDEX FRANCE Attn : SEM4 Service Bulletins Management FAX : (33) 5 61 93 42 51 Or via your Resident Customer Support Office.

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