# A340 SERVICE BULLETIN REVISION TRANSMITTAL SHEET

**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 ATA SYSTEM : 27**  **TITLE : FLIGHT CONTROLS - THSA - INSPECTION OF THE BALL SCREW ASSY FOR INTEGRITY OF THE PRIMARY AND SECONDARY LOAD PATH**  **MODIFICATION No. :** INSPECTION This page transmits Revision No. 08 of Service Bulletin No. A340-27-4107 A D D I T I O N A L WO R K No additional work is required by this revision for aircraft modified by any previous issue. R E A S O N This Revision is issued to divide this Service Bulletin into : - Config. 01 valid for aircraft without Service Bulletin No. A340-27-4136 (THSA PN 47172-XXX) accomplished. - Config. 02 valid for aircraft with Service Bulletin No. A340-27-4136 accomplished and without Service Bulletin No. A340-92-4056 accomplished. C H A N G E S SUMMARY : - REASON/DESCRIPTION/OPERATIONAL CONSEQUENCES

. Sentence added. - MANPOWER

. Reference to Configs. 01 and Config. 02 added. - Figure

. Reference to Config. 01 added. - Figure

. Figure for Config. 02 added. PLANNING INFORMATION : DATE : May 30/02 SERVICE BULLETIN No. : A340-27-4107

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# A340 SERVICE BULLETIN REVISION TRANSMITTAL SHEET

- EFFECTIVITY

. 1.A. NOTES added. - History

. 1.C.(1) Sentence added. - DESCRIPTION

. 1.D. Reference to Config. 01 and Worksteps for Config. 02 added. . 1.D.(1)(d) Workstep added. - COMPLIANCE - Accomplishment Timescale

. 1.E.(2) Sentence added. - MANPOWER

. 1.G. Reference to Configs. 01 and 02 added. - REFERENCES

. 1.J. References to Service Bulletins added. ACCOMPLISHMENT INSTRUCTIONS : - Preparation

. 3.A.(1) Reference to Configs. 01 and 02 added. . 3.A.(1)(a)6 Text amended. - INSPECTION

. 3.B. Reference to Config. 01 and Worksteps for Config. 02 added. - CLOSE-UP

. 3.D. Reference to Configs. 01 and 02 added. - Figure 1

. detail updated. - Figure 2

. detail updated. - Figure 3 DATE : May 30/02 SERVICE BULLETIN No. : A340-27-4107

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# A340 SERVICE BULLETIN REVISION TRANSMITTAL SHEET
. New Figure for Config. 02 added. - Figure 4

. Figure for inspection of the Checkable Shear-Pins added. NOTE : Layout changes due to computerization of this revision are not identified. F I L I N G I N S T R U C T I O N S This Service Bulletin has been generated electronically and is reissued as a complete document. Replace the complete document. Put this Revision Transmittal Sheet in front of the Service Bulletin. H I S T O R Y O F P R E V I O U S R E V I S I O N S Refer to the previous issues of AOT 27A4107. - The AOT 27A4107 was issued on May 30/02 to inform the operators about a repetitive inspection to be performed on the ball screw assy for integrity of the primary and secondary load path. - The AOT 27A4107 was revised on Jul 25/02 to provide operators with a simpler Inspection procedure and clearer GO/NOGO criteria. Revision No. 02 was issued to supersede AOT 27A4107 Rev. 01 (dated Jul 25/02). Revision No. 03 was issued to add the inspection of the screw shaft and to correct the AMM references. Revision No. 04 was issued to extend the effectivity and to introduce minor changes. Revision No. 05 was issued to : - correct the AMM reference, - add inspection procedure for RH THS/THSA lower attachment, - change inspection procedure from THS/THSA lower attachment to LH THSA. Revision No. 06 was issued to : - extend the effectivity up to MSN 0668, - delete the aircraft MSN 0289 from the effectivity, - update the preparation para. Revision No. 07 was issued to update the Effectivity.

DATE : May 30/02 SERVICE BULLETIN No. : A340-27-4107

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# A340 SERVICE BULLETIN REVISION TRANSMITTAL SHEET

ORIGINAL : May 30/02 REVISION No. : 01 - Jul 25/02 REVISION No. : 02 - Sep 23/02 REVISION No. : 03 - Dec 04/02 REVISION No. : 04 - Jun 20/03 REVISION No. : 05 - Dec 08/03 REVISION No. : 06 - Dec 16/05 REVISION No. : 07 - Mar 16/07 REVISION No. : 08 - Dec 06/07

DATE : May 30/02 SERVICE BULLETIN No. : A340-27-4107

REVISION No. : 08 - Dec 06/07 Page : 4 Printed in France © AIRBUS 2007 All rights reserved

# A340 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 M A N DA T

O RY M A N DA T

O RY M A N DA TO RY M A N DA TO RY **ATA SYSTEM : 27 TITLE : FLIGHT CONTROLS - THSA - INSPECTION OF THE BALL SCREW ASSY FOR INTEGRITY OF**  **THE PRIMARY AND SECONDARY LOAD PATH MODIFICATION No. :**  INSPECTION R E A S O N /D E S C R I PT I O N /O P E RA T I O N A L C O N S E Q U E N C E S The THSA (Trimmable Horizontal Stabilizer Actuator) comprises a ball nut, which forms the primary load path and a threaded nut as a secondary load path. Both run on the screw shaft. In case of failure of the primary load path, loads are transferred to the secondary one. When the secondary nut is loaded, the friction increases between the titanium nut and steel screw due to material characteristics. Investigations of the THSA transfer tube have indicated that the THSA secondary nut does not lock the THSA after few movements as expected under certain cyclic load conditions but continues to operate with high friction which results in damage to the screw and the secondary nut. Operation of the secondary load path is detected by the Flight Control Primary Computers (FCPC) if the THSA efficiency decreases to such an extent that the position error monitoring threshold is exceeded. If this condition remains undetected, a primary load path failure may result in damage to the screw and secondary nut and, in extreme cases, in failure of the actuator. Accomplishment of this Service Bulletin is mandatory as per the latest issue of Consigne de Navigabilite (CN) (Airworthiness Directive (AD)) No. F-2002-415(B). This Service Bulletin is not applicable for aircraft with the CSP-System electrical connected to the FCPCs. It means that this Service Bulletin is not applicable for aircraft having accomplished Service Bulletin No. A340-92-4056 and Service Bulletin No. A340-27-4136 (for THSA PN 47172-XXX). This Service Bulletin which replaces AOT 27A4107 Rev. 01 (dated Jul 25/02) introduces a repetitive detailed visual inspection of the THSA ball screw assy and a check of the gap between the secondary tenons and the transfer plates with a feeler gage. The THSA must be replaced before next flight if cracks, distortion, dents or corrosion are found on the screw shaft, gimbal, fail safe plates, transfer plates, ball nut body, return tubes or collar, or if the feeler gage has failed at any 4 gaps. The inspection detailed in this Service Bulletin has to be repeated at intervals not exceeding 700 FH. The accomplishment of this Service Bulletin will ensure the reliable function of the THSA.

DATE : May 30/02 SERVICE BULLETIN No. : A340-27-4107

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# A340 SERVICE BULLETIN SUMMARY

EVALUATION TABLE COMPLIANCE Mandatory CANCELS INSPECTION SB No AD F-2002-415(B) A/C OPERATION AFFECTED No RELIABILITY AFFECTED Yes PAX COMFORT AFFECTED No COST SAVING No LROPS AFFECTED No STRUCTURAL LIFE EXTN No VENDOR SB INVOLVED No KIT PRICE (USD) No Kit **E F**  **F E**  **C T**  **I V**  **I T** **Y** This Service Bulletin is applicable to these operator(s) : 13W 86W AAW ACA AFR AJM ALK ARG AUA B3R BWA CAL CCA CES CPA D2F DGA DLH ETD FIN GFA IBE JAI KAC LAN M3R MAU MPD MSR NMB OAL PAL QAF R3L RJA S3R SAA SAS SWR TAP THT THY UAE VCV VIR C O N C U R R E N T R E Q U I R E M E N T S None R E F E R E N C E S/ R E P E R C U S S I O N S TFU : 27.44.51.008 OEB : None AOT : 27A4107 SIL : None LIFE LIMIT : None LINE MAINTENANCE AFFECTED : No OTHERS : None N A T U R E O F T H E WO R K AIRCRAFT : YES EQUIPMENT : NO HARD : NO SOFT : NO OBRM : NO
DATE : May 30/02 SERVICE BULLETIN No. : A340-27-4107

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# A340 SERVICE BULLETIN SUMMARY

M A N P OW E R Config. 01 thru Config. 02
**TOTAL MANHOURS 1.00 ELAPSED TIME (HOURS) 1.00**  M A T E R I A L I N F O R M A T I O N AIRCRAFT DATA None A P P E N D I C E S Refer to Appendix 1 - Report Sheet

DATE : May 30/02 SERVICE BULLETIN No. : A340-27-4107

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# A340 SERVICE BULLETIN SUMMARY

DATE : May 30/02 SERVICE BULLETIN No. : A340-27-4107

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# A340 SERVICE BULLETIN SUMMARY

DATE : May 30/02 SERVICE BULLETIN No. : A340-27-4107

REVISION No. : 08 - Dec 06/07 Page : 5 Printed in France © AIRBUS 2007 All rights reserved

# A340 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** M A N DA T

O RY M A N DA T

O RY M A N DA TO RY M A N DA TO RY **ATA SYSTEM : 27 TITLE : FLIGHT CONTROLS - THSA - INSPECTION OF THE BALL SCREW ASSY FOR INTEGRITY OF**  **THE PRIMARY AND SECONDARY LOAD PATH MODIFICATION No. :**  INSPECTION 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 the 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. P L**  **A N**  **N I**  **N G**  **I N**  **F O**  **R M**  **A T**  **I O**  **N A. E**  **F F**  **E C** **T I**  **V I**  **T Y**  (1) Models 340-211 340-212 340-213 340-311 340-312 340-313 (2) Aircraft (a) Effectivity by MSN This Service Bulletin is applicable to aircraft MSN : 0002-0009 0011 0013-0016 0018-0029 0031-0035 0038-0041 0043 0044 0046-0049 0051-0053 0056-0058 0061 0063 0074-0076 0078-0081 0084 0085 0088-0091 0093 0094 0097 0101 0103 0104 0114 0115 0117 0123 0125 0126 0128 0129 0131 0133-0137 0139 0141 0142 0145-0147 0149-0152 0154 0156-0161 0163 0164 0166-0170 0173-0176 0178-0180 0182 0185-0187 0190 0192-0194 0196 0197 0199 0201 0202 0204 0207 0208 0210 0212-0218 0220 0221 0225 0227 0228 0233 0235-0237 0239 0242 0243 0245 0246 0252 0257 0260 0263 0264 0268 0270 0273 0274 0278 0280 0282 0292 0297 0302 0304 0307 0310 0318 0319 0321 0325 0327 0329 0331 0332 0335 0347 0352 0354 0355 0359 0363 0367 0373 0374 0377-0379 0381 0385 0387 0390 0395 0399 0402 0406 0411 0413-0415 0424 0429 0430 0433-0435 0438 0442 0446 0447 0450 0459 0467 0470 0474 0483 0528

DATE : May 30/02 SERVICE BULLETIN No. : A340-27-4107

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# A340 SERVICE BULLETIN

0538 0541 0544-0546 0554 0556 0559 0561 0562 0582 0585 0590 0598 0643 0646 0651 0668 0793 0800 (b) 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. OPERATOR MSN 13W 0009 86W 0007 AAW 0151 ACA 0048 0088 0154 0167 0170 0175 0179 0273 0278 AFR 0029 0049 0078 0084 0168 0174 0186 0207 0210 0237 0245 0246 0260 0307 0310 0319 0373 0377 0399 AJM 0216 0257 ALK 0032 0033 0034 0367 0374 ARG 0063 0074 0080 0085 AUA 0169 0263 B3R 0046 BWA 0093 CAL 0402 0406 0411 0415 0433 0528 0541 CCA 0192 0199 0201 0242 0243 0264 CES 0129 0131 0141 0161 0182 CPA 0123 0126 0128 0136 0137 0142 0147 0157 0160 0208 0218 0220 0227 0228 0381 D2F 0016 DGA 0075 0081 DLH 0020 0024 0027 0028 0035 0052 0053 0056 0135 0158 0213 0233 0252 0274 0297 0304 0321 0325 0327 0335 0347 0352 0354 0355 0379 0390 0434 0447 ETD 0117 DATE : May 30/02 SERVICE BULLETIN No. : A340-27-4107

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# A340 SERVICE BULLETIN

OPERATOR MSN FIN 0058 GFA 0039 0040 0097 0103 0133 0212 0215 0282 0554 IBE 0005 0125 0134 0145 0146 0193 0197 0217 0221 0302 0318 0329 0332 0378 0387 0414 0459 0474 0483 JAI 0651 KAC 0089 0090 0101 0104 LAN 0359 0363 0429 0442 M3R 0061 MAU 0076 0094 0152 0194 0268 0793 0800 MPD 0013 0015 MSR 0156 0159 0178 NMB 0047 0051 OAL 0235 0239 0280 0292 PAL 0173 0176 0187 0196 QAF 0026 R3L 0004 RJA 0014 0022 0038 0043 S3R 0204 SAA 0006 0008 0011 0018 0019 0021 0544 0582 0590 0643 0646 SAS 0413 0424 0430 0435 0450 0467 0470 SWR 0150 0538 0545 0546 0556 0559 0561 0562 0585 0598 TAP 0041 0044 0079 0091 THT 0385 0395 0438 0446 0668 THY 0023 0025 0057 0115 0180 0270 0331 UAE 0139 0149 0163 0166 0185 0190 0202 0236 VCV 0031 DATE : May 30/02 SERVICE BULLETIN No. : A340-27-4107

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# A340 SERVICE BULLETIN

OPERATOR MSN VIR 0002 0003 0114 0164 0214 0225 (c) Effectivity by MSN and Kit/Configuration The Kits and configurations applicable to these MSNs are given at the end of this list 0002-0009 0011 0013-0016 0018-0029 0031-0035 0038-0041 0043-0044 0046-0049 0051-0053 0056-0058 0061 0063 0074-0076 0078-0081 0084-0085 0088-0091 0093-0094 0097 0101 0103-0104 0114-0115 0117 0123 0125-0126 0128-0129 0131 0133-0137 0139 0141-0142 0145-0147 0149-0152 0154 0156-0161 0163-0164 0166-0170 0173-0176 0178-0180 0182 0185-0187 0190 0192-0194 0196-0197 0199 0201-0202 0204 0207-0208 0210 0212-0218 0220-0221 0225 0227-0228 0233 0235-0237 0239 0242-0243 0245-0246 0252 0257 0260 0263-0264 0268 0270 0273-0274 0278 0280 0282 0292 0297 0302 0304 0307 0310 0318-0319 0321 0325 0327 0329 0331-0332 0335 0347 0352 0354-0355 0359 0363 0367 0373-0374 0377-0379 0381 0385 0387 0390 0395 0399 0402 0406 0411 0413-0415 0424 0429-0430 0433-0435 0438 0442 0446-0447 0450 0459 0467 0470 0474 0483 0528 0538 0541 0544-0546 0554 0556 0559 0561-0562 0582 0585 0590 0598 0643 0646 0651 0668 0793 0800 KIT No. QTY PER A/C CONFIGURATION None 01 None 02 NOTE : Config. 01 is valid for aircraft without Service Bulletin No. A340-27-4136 (THSA PN 47172-XXX) accomplished. NOTE : Config. 02 is valid for aircraft with Service Bulletin No. A340-27-4136 accomplished and without Service Bulletin No. A340-92-4056 accomplished. (3) Spares None **B. C O**  **N C**  **U R**  **R E**  **N T**  **R E**  **Q U**  **I R**  **E M**  **E N**  **T S**  None **C. R E** **A S**  **O N**  (1) History The THSA (Trimmable Horizontal Stabilizer Actuator) comprises a ball nut, which forms the primary load path and a threaded nut as a secondary load path. Both run on the screw shaft. In case of failure of the primary load path, loads are transferred to the secondary one. When the secondary nut is loaded, the friction increases between the titanium nut and steel screw due to material characteristics. Investigations of the THSA transfer tube have indicated that the THSA secondary nut does not lock the THSA after few movements as DATE : May 30/02 SERVICE BULLETIN No. : A340-27-4107

REVISION No. : 08 - Dec 06/07 Page : 4 Printed in France © AIRBUS 2007 All rights reserved

# A340 SERVICE BULLETIN

expected under certain cyclic load conditions but continues to operate with high friction which results in damage to the screw and the secondary nut. Operation of the secondary load path is detected by the Flight Control Primary Computers (FCPC) if the THSA efficiency decreases to such an extent that the position error monitoring threshold is exceeded. If this condition remains undetected, a primary load path failure may result in damage to the screw and secondary nut and, in extreme cases, in failure of the actuator. Accomplishment of this Service Bulletin is mandatory as per the latest issue of Consigne de Navigabilite (CN) (Airworthiness Directive (AD)) No. F-2002-415(B). This Service Bulletin is not applicable for aircraft with the CSP-System electrical connected to the FCPCs. It means that this Service Bulletin is not applicable for aircraft having accomplished Service Bulletin No. A340-92-4056 and Service Bulletin No. A340-27-4136 (for THSA PN 47172-XXX). (2) Objective/Action This Service Bulletin which replaces AOT 27A4107 Rev. 01 (dated Jul 25/02) introduces a repetitive detailed visual inspection of the THSA ball screw assy and a check of the gap between the secondary tenons and the transfer plates with a feeler gage. The THSA must be replaced before next flight if cracks, distortion, dents or corrosion are found on the screw shaft, gimbal, fail safe plates, transfer plates, ball nut body, return tubes or collar, or if the feeler gage has failed at any 4 gaps. The inspection detailed in this Service Bulletin has to be repeated at intervals not exceeding 700 FH. (3) Advantages The accomplishment of this Service Bulletin will ensure the reliable function of the THSA. (4) Operational/Maintenance Consequences None **D. D E**  **S C**  **R I**  **P T**  **I O**  **N** To accomplish this Service Bulletin it is necessary to : (1) Config. 01 (a) Do a detailed visual inspection. (b) Check the gap between the secondary nut tenons and the transfer plates with a feeler gage. (c) Assessment criteria. (d) Repeat the check at intervals not exceeding 700 FH. (2) Config. 02 (a) Do a detailed visual inspection. DATE : May 30/02 SERVICE BULLETIN No. : A340-27-4107

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# A340 SERVICE BULLETIN

(b) Do a detailed inspection of the checkable shear-pins. (c) Assessment criteria. (d) Repeat the check at intervals not exceeding 700 FH. **E. C O**  **M P**  **L I**  **A N**  **C E**  (1) Classification Mandatory (2) Accomplishment Timescale Accomplishment of this Service Bulletin is mandatory as per the latest issue of Consigne de Navigabilite (CN) (Airworthiness Directive (AD)) No. F-2002-415(B). Accomplishment of this revision is expected to be rendered mandatory by the issue of an Airworthiness Directive (AD) published by the European Aviation Safety Agency (EASA). It is anticipated that the applicable AD will confirm the existing threshold and interval, but reference should be made to the applicable AD for confirmation of the mandated accomplishment timescale. **F. A P**  **P R**  **O V**  **A L**  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. M A**  **N P**  **O W**  **E R**  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 operators’ circumstances. The estimates do not include the time to prepare, plan or inspect the work. Manufacture and procurement of parts and tools, drying time for paints, sealants, etc. and general administration work are also not included. Config. 01 thru Config. 02 Get Access 0.25 Inspection 0.50 Close-up 0.25 **TOTAL MANHOURS 1.00 ELAPSED TIME (HOURS) 1.00** 
DATE : May 30/02 SERVICE BULLETIN No. : A340-27-4107

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# A340 SERVICE BULLETIN

**H. W E**  **I G**  **H T**  **A N**  **D B** **A L** **A N**  **C E**  Not changed **I. E L**  **E C** **T R**  **I C**  **A L**  **L O** **A D**  **D A** 

**T**

**A** Not changed **J. R E**  **F E**  **R E**  **N C**  **E S**  Aircraft Maintenance Manual (AMM) : 12-34-24 24-42-00 27-40-00 27-44-00 27-44-51 29-00-00 29-14-00 Elec. Std. Practices Manual (ESPM) : 20-55-00 Appendix 1 Airworthiness Directive (AD) F-2002-415(B) Service Bulletin No. A340-27-4136 Service Bulletin No. A340-92-4056 **K. P U**  **B L**  **I C**  **A T**  **I O**  **N S**  **A F**  **F E**  **C T**  **E D**  Aircraft Maintenance Manual (AMM) : 27-44-51 **L. I N**  **T E**  **R C**  **H A**  **N G**  **E A**  **B I**  **L I**  **T Y**  **/ M**  **I X** **A B**  **I L**  **I T** **Y** Not applicable

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# A340 SERVICE BULLETIN

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# A340 SERVICE BULLETIN

**2. M A**  **T E**  **R I**  **A L**  **I N**  **F O**  **R M**  **A T**  **I O**  **N A. M**  **A T**  **E R**  **I A**  **L -**  **P R**  **I C**  **E A**  **N D**  **A V** 

**A I**  **L A**  **B I**  **L I**  **T Y**  None **B. I N**  **D U**  **S T**  **R Y**  **S U**  **P P**  **O R** **T I**  **N F**  **O R**  **M A**  **T I**  **O N**  AIRBUS will not provide industrial support for accomplishment of this Service Bulletin. **C. L I**  **S T**  **O F**  **C O**  **M P**  **O N**  **E N**  **T S**  None **D. L I**  **S T**  **O F**  **M A**  **T E**  **R I**  **A L**  **S -**  **O P**  **E R**  **A T** **O R**  **S U**  **P P**  **L I**  **E D**  None **E. P A**  **R T** **S T** **O B**  **E R**  **E -**  **I D**  **E N**  **T I**  **F I**  **E D**  **B Y**  **T H**  **E O**  **P E**  **R A**  **T O**  **R** None **F. T O**  **O L**  **I N**  **G -**  **P R**  **I C**  **E A**  **N D**  **A V** 

**A I**  **L A**  **B I**  **L I**  **T Y**  None **G. S P**  **E C**  **I A**  **L T** **O O**  **L S**  None

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# A340 SERVICE BULLETIN

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# A340 SERVICE BULLETIN

**3. A C**  **C O**  **M P**  **L I**  **S H**  **M E**  **N T**  **I N**  **S T**  **R U**  **C T**  **I O**  **N S**  **A. G E**  **N E**  **R A**  **L** WARNING : MAKE SURE THAT YOU OBEY ALL THE WARNINGS AND ALL THE CAUTIONS INCLUDED IN THE REFERENCED PROCEDURES. WARNING : MAKE SURE THAT THE TRAVEL RANGES OF THE FLIGHT CONTROLS ARE CLEAR. MOVEMENT OF FLIGHT CONTROLS CAN CAUSE INJURY TO PERSONS AND/OR DAMAGE. WARNING : MAKE SURE THAT SAFETY DEVICES AND THE WARNING NOTICES ARE IN POSITION BEFORE YOU START A TASK ON OR NEAR : - THE FLIGHT CONTROLS, - THE FLIGHT CONTROL SURFACES, - THE LANDING GEAR AND THE RELATED DOORS, - COMPONENTS THAT MOVE. MOVEMENT OF COMPONENTS CAN KILL OR INJURE PERSONS. 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 ELECTRICAL 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. (1) Preparation (a) Config. 01 thru Config. 02 1 Make sure that the aircraft is electrically grounded, refer to AMM 12-34-24, Page block 201. 2 Energize the aircraft electrical circuits, refer to AMM 24-42-00, Page block 201. 3 Move the THS actuator in the 0 deg. position, refer to AMM 27-40-00, Page block 201. 4 Depressurize the Blue, Green and Yellow hydraulic systems, refer to AMM 29-00-00, Page block 201. DATE : May 30/02 SERVICE BULLETIN No. : A340-27-4107

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# A340 SERVICE BULLETIN

5 Depressurize the reservoirs of the Blue, Green and Yellow hydraulic systems, refer to AMM 29-14-00, Page block 201. 6 Put the warning notices in the cockpit to tell persons : - Not to pressurize the Blue, Green and Yellow hydraulic systems, - Not to pressurize the reservoirs of the Blue, Green and Yellow hydraulic systems, - Not to operate the THS actuator. 7 Put the warning notices in position : - On the panel 215VU, to tell persons not to start the APU, - On the panel 990VU, to tell persons not to refuel the aircraft. 8 Put the access platform in position below the access door 312AR. 9 Open the access door 312AR and set the LIGHT switch 4LJ to the ON position. 1 0 Open, safety and tag this (these) circuit breaker(s) : - refer to AMM 27-44-00, Page block 601. (2) Standard Practices None (3) Work Breakdown None **B. I N**  **S P**  **E C** **T I**  **O N**  (1) Config. 01 (a) Do a detailed visual inspection. Refer to Figure 1 Refer to Figure 2 1 Visually inspect the ball screw assy. Refer to Figure 1
a Clean the THSA screw shaft, ball nut assy and its connection to the THSA arms, refer to AMM 27-44-51, Page block 401, Figure "THS Arms Assemblies". b Inspect these items for absence of cracks, dents, corrosion, metallic debris, loose nut, damaged or missing lock washers and pins : Refer to Figure 1, Sheet 1, Detail B DATE : May 30/02 SERVICE BULLETIN No. : A340-27-4107

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# A340 SERVICE BULLETIN

1 screw shaft Item (6) Refer to Figure 1, Sheet 2, Detail C 2 fail safe plate Item (1) 1 ball nut body Item (2) 1 gimbal Item (3) 2 transfer plate Item (4) Refer to Figure 1, Sheet 2, Detail D 1 collar Item (7) 3 return tube Item (8) 2 Visually inspect the THS/THSA lower attachment LH. Refer to Figure 2, Sheet 1 and 2, Section D-D
a Inspect these items for presence of : 1 THS arm bush LH Item (15)

b Inspect these items of the ball screw assy for presence and correct installation of ball screw assy to the THS arms. 1 cotter pin Item (17) 1 nut Item (18) 1 cap washer Item (19) 1 key washer Item (20) 1 bolt Item (21) 3 Visually inspect the THS/THSA lower attachment RH. Refer to Figure 2, Sheet 1 and 2, Section E-E
a Inspect these items for presence of : 1 THS arm bush RH Item (16)

b Inspect these items of the ball screw assy for presence and correct installation of ball screw assy to the THS arms. 1 cap washer Item (19) 1 key washer Item (20) 1 bolt Item (21) 4 Visually inspect the ball nut to secondary nut interface. Refer to Figure 1, Sheet 2, Detail D
a Inspect the interface for presence of : 2 blind rivet Item (10) 4 drive pin Item (11)

b Inspect this item for integrity : DATE : May 30/02 SERVICE BULLETIN No. : A340-27-4107

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# A340 SERVICE BULLETIN

1 locking bush Item (9) NOTE : The linkage plate may be deformed (static condition). This fact does not impact THSA serviceability. (b) Check the gap between the secondary nut tenons and the transfer plates with a feeler gage. Refer to Figure 1, Sheet 2, Detail C 1 Make sure that the fixture strut PN 98A27407514004 is not installed. NOTE : There is no specific requirement as for the position of the horizontal stabilizer. 2 Check the gap at the secondary nut tenon.
a Use a feeler gage 0.4 mm (0.016 in.) and check along the upper and lower gap at the interface of : 2 secondary tenon Item (5) to : 2 transfer plate Item (4) The gage should move along freely between both surfaces. (c) Assessment criteria. 1 In case of findings by visual inspection.
a Replace the THSA before next flight in case cracks, dents corrosion are found on the parts inspected in Para. (1) (a) 1

. b Contact AIRBUS CUSTOMER SERVICES, ENGINEERING SERVICES, FLIGHT CONTROL SYSTEMS, for damage assessment before next flight in case of : - metallic debris, - loose nut, - damaged or missing lock washers, pins and parts or - incorrect installation of items, found during the inspection of the parts mentioned in Para. (1) (a).
c Record the findings on the Report Sheet ref. Appendix 1. 2 In case of findings by checking the gap at the secondary nut tenons.
DATE : May 30/02 SERVICE BULLETIN No. : A340-27-4107

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# A340 SERVICE BULLETIN

a Replace the THSA before next flight if the feeler gage has failed at any of the 4 gaps. 3 In case of no findings by visual inspection and gap checking at the secondary nut tenons.
a No further action is required. (d) Repeat the check at intervals not exceeding 700 FH. (2) Config. 02 (a) Do a detailed visual inspection. Refer to Figure 2 Refer to Figure 3 Refer to Figure 4 1 Visually inspect the ball screw assy. Refer to Figure 3
a Clean the THSA screw shaft, ball nut assy and its connection to the THSA arms, refer to AMM 27-44-51, Page block 401, Figure "THS Arms Assemblies". b Inspect these items for absence of cracks, dents, corrosion, metallic debris, loose nut, damaged or missing lock washers and pins : Refer to Figure 3, Sheet 1, Detail B 1 screw shaft Item (6) Refer to Figure 3, Sheet 2, Detail C 2 fail safe plate Item (1) 1 ball nut body Item (2) 1 gimbal Item (3) 2 transfer plate Item (4) Refer to Figure 3, Sheet 2, Detail D 1 collar Item (7) 3 return tube Item (8) 2 Visually inspect the THS/THSA lower attachment LH. Refer to Figure 2, Sheet 1 and 2, Section D-D
a Inspect these items for presence of : 1 THS arm bush LH Item (15)

b Inspect these items of the ball screw assy for presence and correct installation of ball screw assy to the THS arms. DATE : May 30/02 SERVICE BULLETIN No. : A340-27-4107

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# A340 SERVICE BULLETIN

1 cotter pin Item (17) 1 nut Item (18) 1 cap washer Item (19) 1 key washer Item (20) 1 bolt Item (21) 3 Visually inspect the THS/THSA lower attachment RH. Refer to Figure 2, Sheet 1 and 2, Section E-E
a Inspect these items for presence of : 1 THS arm bush RH Item (16)

b Inspect these items of the ball screw assy for presence and correct installation of ball screw assy to the THS arms. 1 cap washer Item (19) 1 key washer Item (20) 1 bolt Item (21) (b) Do a detailed inspection of the checkable shear-pins. Refer to Figure 4, Sheet 2, Section A-A Refer to AMM 27-44-51, Page block 601 1 If the dimension of both check buttons is 10 mm (0.394 in.) or less : - no further action is required. 2 If the dimension of one or two check buttons is more than 10 mm (0.394 in.) : - Replace the THSA before next flight. (c) Assessment criteria. 1 In case of findings by visual inspection.
a Replace the THSA before next flight in case cracks, dents corrosion are found on the parts inspected in Para. (2) (a) 1

. b Contact AIRBUS CUSTOMER SERVICES, ENGINEERING SERVICES, FLIGHT CONTROL SYSTEMS, for damage assessment before next flight in case of : - metallic debris, - loose nut, - damaged or missing lock washers, pins and parts or - incorrect installation of items, found during the inspection of the parts mentioned in Para. (2) (a). DATE : May 30/02 SERVICE BULLETIN No. : A340-27-4107

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# A340 SERVICE BULLETIN

c Record the findings on the Report Sheet ref. Appendix 1. (d) Repeat the check at intervals not exceeding 700 FH. **C. T E**  **S T**  None **D. C L**  **O S**  **E U**  **P** (1) Config. 01 thru Config. 02 (a) Make sure that the work areas are clean and clear of tools and other items of equipment. (b) Set the LIGHT switch 4LJ to the OFF position and close the access door 312AR (c) Remove the safety clip(s) and tag(s) and close this (these) circuit breaker(s) : - refer to AMM 27-44-00, Page block 601. (d) Remove the warning notices. (e) Remove the access platform(s). **E. D O**  **C U**  **M E**  **N T**  **A**

**T I**  **O N**  Write in the applicable aircraft records that you have done all the work given in this Service Bulletin.

DATE : May 30/02 SERVICE BULLETIN No. : A340-27-4107

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# A340 SERVICE BULLETIN

Figure 1, Sheet 1 Config. 01: Inspection of THS-Actuator Attachments, Screw Shaft, Primary and Secondary Nut
DATE : May 30/02 SERVICE BULLETIN No. : A340-27-4107

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# A340 SERVICE BULLETIN

Figure 1, Sheet 2 Config. 01: Inspection of THS-Actuator Attachments, Screw Shaft, Primary and Secondary Nut
DATE : May 30/02 SERVICE BULLETIN No. : A340-27-4107

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# A340 SERVICE BULLETIN

Figure 2, Sheet 1 Config. 01 thru 02: THS-Arm Assemblies
DATE : May 30/02 SERVICE BULLETIN No. : A340-27-4107

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# A340 SERVICE BULLETIN

Figure 2, Sheet 2 Config. 01 thru 02: THS-Arm Assemblies
DATE : May 30/02 SERVICE BULLETIN No. : A340-27-4107

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# A340 SERVICE BULLETIN

Figure 3, Sheet 1 Config. 02: Inspection of THS-Actuator Attachments, Screw Shaft, Primary and Secondary Nut
DATE : May 30/02 SERVICE BULLETIN No. : A340-27-4107

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# A340 SERVICE BULLETIN

Figure 3, Sheet 2 Config. 02: Inspection of THS-Actuator Attachments, Screw Shaft, Primary and Secondary Nut
DATE : May 30/02 SERVICE BULLETIN No. : A340-27-4107

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# A340 SERVICE BULLETIN

Figure 4, Sheet 1 Config. 02: Inspection of the Checkable Shear-Pins
DATE : May 30/02 SERVICE BULLETIN No. : A340-27-4107

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# A340 SERVICE BULLETIN

Figure 4, Sheet 2 Config. 02: Inspection of the Checkable Shear-Pins
DATE : May 30/02 SERVICE BULLETIN No. : A340-27-4107

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# A340 SERVICE BULLETIN

This Page Intentionally Left Blank

DATE : May 30/02 SERVICE BULLETIN No. : A340-27-4107

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# A340 SERVICE BULLETIN APPENDIX 1

**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 ATA SYSTEM : 27**  **TITLE : FLIGHT CONTROLS - THSA - INSPECTION OF THE BALL SCREW ASSY FOR INTEGRITY OF THE PRIMARY AND SECONDARY LOAD PATH**  **MODIFICATION No. :** INSPECTION FLIGHT CONTROLS - THSA - INSPECTION OF THE BALL SCREW OF THE PRIMARY AND SECONDARY LOAD PATH

DATE : May 30/02 SERVICE BULLETIN No. : A340-27-4107

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# A340 SERVICE BULLETIN APPENDIX 1

Figure 1, Sheet 1

Report Sheet
DATE : May 30/02 SERVICE BULLETIN No. : A340-27-4107

REVISION No. : 08 - Dec 06/07 Page : 2 Printed in France © AIRBUS 2007 All rights reserved

# A340 SERVICE BULLETIN REPORTING SHEET

**TITLE : FLIGHT CONTROLS - THSA - INSPECTION OF THE BALL SCREW ASSY FOR INTEGRITY OF THE PRIMARY AND SECONDARY LOAD PATH**  **MODIFICATION No. :** INSPECTION P l e a s e c o m p l ete t h e a p p ro p r i ate i te m (A o r B ) : A - SB W I L L B E embodied .................................................................. YES/NO (if NO please comment) If YES, aircraft concerned (as per SB effectivity by default) and planned dates (month/year) of embodiement:

............................................................................................................................... ..............................................

............................................................................................................................... .............................................. B - SB H AS B E E N embodied on aircraft: ............................................................................................................

............................................................................................................................... ..............................................

............................................................................................................................... .............................................. Operator comments:..............................................................................................................

..............................

............................................................................................................................... ..............................................

............................................................................................................................... .............................................. From Airline: ...................................................................................................................

..................................... Name/Title: ....................................................................................................................

...................................... Signature:..................... Date: ..................................................... I f o p e rat i o n a l d o c u m e n t at i o n i s affe cte d ( s e e Pa ra g ra p h 1

. K of t h i s S B ) : If information is needed prior to next normal revision or prior to SB embodiment, please indicate required service(s): Either : Advance data................................................................................... YES/NO Or : Intermediate/Temporary revision ..................................................... YES/NO I m p o rt a n t I n fo r m at i o n : 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. P l e a s e re t u r n t h i s c o m p l ete d s h e et 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.

DATE : May 30/02 SERVICE BULLETIN No. : A340-27-4107

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# A340 SERVICE BULLETIN REPORTING QUALITY

**TITLE : FLIGHT CONTROLS - THSA - INSPECTION OF THE BALL SCREW ASSY FOR INTEGRITY OF THE PRIMARY AND SECONDARY LOAD PATH**  **MODIFICATION No. :** INSPECTION 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 futher 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 X Mod/Inspection X Manpower Operator Supplied X Test X References X Re-identification X Close-up X Publication X Tooling X Illustrations C o m m e n ts :

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. DATE : May 30/02 SERVICE BULLETIN No. : A340-27-4107

REVISION No. : 08 - Dec 06/07 Page : 1 of 1 Printed in France © AIRBUS 2007 All rights reserved