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@A340-500/600
SERVICE BULLETIN
SUMMARY AIRBUS
CUSTOMER SERVICES DIRECTORATE 1 Rond Point Maurice Bellonte 31707 BLAGNAC CEDEX FRANCE T e l:( 3 3 )56 19 33 33 3 Telex : AIRBU 530526F F a x:( 3 3 )56 19 34 25 1 This summary is for information only and is not approved for modification of the aircraft.
MANDATORY
MANDATORY
MANDATORY ATA SYSTEM: 27 TITLE: FLIGHT CONTROLS - TRIMMABLE HORIZONTAL STABILIZER
ACTUATOR - CHECK P/N AND SCHEDULE NEXT NBB DISKS
REPLACEMENT **CONF ALL
MODIFICATIONS None
REASON/DESCRIPTION/OPERATIONAL CONSEQUENCES During endurance qualification tests on other AIRBUS program Trimmable Horizontal Stabiliser Actuator (THSA), a partial loss of No-Back Brake (NBB) efficiency was identified. Due to similarity of design, same tests were done on THSA fitted on LR AIRBUS aircraft (A330 and A340).
During these tests, the partial loss of NBB efficiency was confirmed on THSA 47175 family. The partial loss of the NBB efficiency could lead, in case the hydraulic motors cannot keep the ball screw in its last commanded position, to an uncommanded movement of the Trimmable Horizontal Stabiliser (THS) under specific aerodynamic loads.
The partial loss of NBB efficiency was identified to be due to auto-contamination of the NBB carbon disks (polishing effect that reduces the friction coefficient).
The phenomenon of polishing and auto-contamination of the carbon friction disks is confirmed to be an ageing/endurance issue. A new hard limit of the NBB carbon disks leading to THSA periodic maintenance is set to 3500 flight cycles.
Today the THSA’s installed on aircraft are fitte d with their original NB B disks, consequently, the cumulated FC of the NBB disks corresponds to the cumulated FC of the THSA. THSA NBB disks have to be replaced before 3500 FC, however some THSA have already accumulated more than 3500 FC.
This Inspection Service Bulletin requires to check the P/N of THSA, and depending on the P/N installed:
- For aircraft with P/N 47175-530, to apply ALS part 4,
- For aircraft with P/N 47175-200/300/500/520, to schedule the next replacement of the NBB disks on THSA that have more than 3500 FC with associated grace periods.
DATE: Jul 15/14 SERVICE BULLETIN No.: A340-27-5062 REVISION No.: 00 - Jul 15/14 Page: 1 5 Printed in FRANCE © AIRBUS S.A.S. 2007. All rights reserved.
@A340-500/600
SERVICE BULLETIN
SUMMARY After installation of serviceable THSA, operator must repeat the inspection.
Accomplishment of this Service Bulletin permits scheduling the next THSA maintenance for NBB disks replacement.
GENERAL EVALUATION
EVALUATION TABLE
COMPLIANCE MANDATORY (1)
CANCELS INSPECTION SB NO
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 NO NOTE
(1) : Service Bulletin must be accomplished.
MATERIAL PRICE INFORMATION No Material
EFFECTIVITY This Service Bulletin is applicable to this (these) operator(s) :
06U 25R 36V 70U 72W AHY AIB CES CHH DLH ETD HFM HFY I2L IBE QAF QTR SAA TAM THA UAE VIR
CONCURRENT REQUIREMENTS None
REFERENCES / REPERCUSSIONS TFU
27.44.00.013 OEB None AOT A27L004-13 SIL None
LINE MAINTENANCE AFFECTED No
LIFE LIMIT None OTHER None
NATURE OF THE WORK
AIRCRAFT YES
EQUIPMENT YES HARD NO SOFT NO OBRM NO DATE: Jul 15/14 SERVICE BULLETIN No.: A340-27-5062 REVISION No.: 00 - Jul 15/14 Page: 2 5 Printed in FRANCE © AIRBUS S.A.S. 2007. All rights reserved.
@A340-500/600
SERVICE BULLETIN
SUMMARY
MANPOWER Task 275062-832-801-001: Inspection
TOTAL MANHOURS
2.50
ELAPSED TIME (HOURS)
2.50 Task 275062-833-801-001: Repair
TOTAL MANHOURS
22.50
ELAPSED TIME (HOURS)
11.50
APPENDICES None DATE: Jul 15/14 SERVICE BULLETIN No.: A340-27-5062 REVISION No.: 00 - Jul 15/14 Page: 3 5 Printed in FRANCE © AIRBUS S.A.S. 2007. All rights reserved.
@A340-500/600
SERVICE BULLETIN
SUMMARY **CONF ALL FR87 FR80 B B 312AR A
THSA TO BE INSPECTED − Z311 Z312 A 1CS F_SB_275062_5_SAAA_01_01 Figure A-F SAAA - S heet 01 DATE: Jul 15/14 SERVICE BULLETIN No.: A340-27-5062 REVISION No.: 00 - Jul 15/14 Page: 4 5 Printed in FRANCE © AIRBUS S.A.S. 2007. All rights reserved.
@A340-500/600
SERVICE BULLETIN AIRBUS
CUSTOMER SERVICES DIRECTORATE 1 Rond Point Maurice Bellonte 31707 BLAGNAC CEDEX FRANCE T e l:( 3 3 )56 19 33 33 3 Telex : AIRBU 530526F F a x:( 3 3 )56 19 34 25 1
MANDATORY
MANDATORY
MANDATORY ATA SYSTEM: 27 TITLE: FLIGHT CONTROLS - TRIMMABLE HORIZONTAL STABILIZER
ACTUATOR - CHECK P/N AND SCHEDULE NEXT NBB DISKS
REPLACEMENT MODIFICATION No.: None 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 NOTE : This Service Bulletin is only applicable to THSA P/N 47175-200, P/N 47175-300, P/N 47175-500 and P/N 47175-520.
(1) Models 340-541 340-542 340-642
(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 0715 0719 0723 0727 0736 0740 0744 0748 0753 0757 0761-0768 0771 0775 0779 0783 0787 0790 0794 0798 0804 0812 0829 0837 0846 0848 0870 0886 0894 0897 0902 0910 0912 0917 0924 0929 0933 0953 0960 0972 0981 0987 0993 1005 1017 1030 1040 1079 1091 1102 1122 DATE: Jul 15/14 SERVICE BULLETIN No.: A340-27-5062 REVISION No.: 00 - Jul 15/14 Page: 1 5 Printed in FRANCE © AIRBUS S.A.S. 2007. All rights reserved.
@A340-500/600
SERVICE BULLETIN
(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.
OPERATOR MSN 06U 1091 1102 25R 0924 36V 0391 0416 70U 0902 72W 0917 AHY 0779 0886 0894 AIB 0371 0376 0478 0492 0499 0560 0563 CES 0468 0488 0514 0577 0586 CHH 0436 0453 DLH 0482 0517 0523 0537 0540 0543 0566 0569 0580 0583 0762 0763 0767 0771 0790 0794 0812 0846 0848 0897 0972 0981 0987 1005 ETD 0748 0757 0761 0783 0829 0837 0870 0929 0933 1030 1040 HFM 0383 HFY 0910 0912 I2L 0475 IBE 0431 0440 0460 0601 0604 0606 0617 0619 0672 0702 0727 0744 0960 0993 1017 1079 1122 QAF 0495 QTR 0715 0740 0766 0798 SAA 0410 0417 0426 0531 0534 0547 0557 0626 0630 TAM 0445 0464 THA 0624 0628 0677 0681 0689 0698 0710 0719 0775 0953 UAE 0394 0457 0471 0485 0520 0572 0608 0611 0685 0694 VIR 0449 0575 0615 0622 0639 0706 0723 0736 0753 0764 0765 0768 0787 0804
(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 0715 0719 0723 0727 0736 0740 0744 0748 0753 0757 0761 0762 0763 0764 0765 0766 0767 0768 0771 0775 0779 0783 0787 0790 0794 0798 0804 0812 0829 0837 0846 0848 0870 0886 0894 0897 0902 0910 0912 0917 0924 0929 0933 0953 0960 0972 0981 0987 0993 1005 1017 1030 1040 1079 1091 1102 1122 001 DATE: Jul 15/14 SERVICE BULLETIN No.: A340-27-5062 REVISION No.: 00 - Jul 15/14 Page: 2 5 Printed in FRANCE © AIRBUS S.A.S. 2007. All rights reserved.
@A340-500/600
SERVICE BULLETIN
(5) Configuration definition **CONF 001 Config. 001 is valid for all the aircraft given in the effectivity of this Service Bulletin as a standard configuration.
(6) Material Effectivity No Material Set B. CONCURRENT REQUIREMENTS None C. REASON
(1) History During endurance qualification tests on other AIRBUS program Trimmable Horizontal Stabiliser Actuator (THSA), a partial loss of No-Back Brake (NBB) efficiency was identified. Due to similarity of design, same tests were done on THSA fitted on LR AIRBUS aircraft (A330 and A340).
During these tests, the partial loss of NBB efficiency was confirmed on THSA 47175 family. The partial loss of the NBB efficiency could lead, in case the hydraulic motors cannot keep the ball screw in its last commanded position, to an uncommanded movement of the Trimmable Horizontal Stabiliser (THS) under specific aerodynamic loads.
The partial loss of NBB efficiency was identified to be due to auto-contamination of the NBB carbon disks (polishing effect that reduces the friction coefficient).
The phenomenon of polishing and auto-contamination of the carbon friction disks is confirmed to be an ageing/endurance issue. A new hard limit of the NBB carbon disks leading to THSA periodic maint enance is set to 3500 flight cycles.
Today the THSA’s installed on aircraft are fitted with their original NBB disks, consequently, the cumulated FC of the NBB disks corresponds to the cumulated FC of the THSA. THSA NBB disks have to be replaced before 3500 FC, however some THSA have already accumulated more than 3500 FC.
(2) Objective/Action This Inspection Service Bulletin requires to check the P/N of THSA, and depending on the P/N installed:
- For aircraft with P/N 47175-530, to apply ALS part 4,
- For aircraft with P/N 47175-200/300/500/520, to schedule the next replacement of the NBB disks on THSA that have more than 3500 FC with associated grace periods.
After installation of serviceable THSA, operator must repeat the inspection.
DATE: Jul 15/14 SERVICE BULLETIN No.: A340-27-5062 REVISION No.: 00 - Jul 15/14 Page: 3 5 Printed in FRANCE © AIRBUS S.A.S. 2007. All rights reserved.
@A340-500/600
SERVICE BULLETIN
(3) Advantages Accomplishment of this Service Bulletin permits scheduling the next THSA maintenance for NBB disks replacement.
(4) Operational/Maintenance Consequences None D. DESCRIPTION To accomplish this Service Bulletin it is necessary to :
Task 275062-832-801-001: Inspection
(1) Schedule THSA Maintenance (FIN 1CS) Task 275062-833-801-001: Repair
(1) Install a Serviceable THSA E. COMPLIANCE
(1) Classification MANDATORY: Service Bulletin must be accomplished.
(2) Accomplishment Timescale This Service Bulletin has been classified Mandatory. It is expected that an Airworthiness Directive (AD) published by the European Av iation Safety Agenc y (EASA) will be issued to confirm this classification. It is anticipated that the AD will confirm the thresholds given but reference should be made to the AD for confirmation of the mandated accomplishment timescale.
Table 1, Config. 001 - Inspection of the THSA P/N (FIN 1CS) Compliance Time Condition Action Threshold Grace Period Repetitive interval All Aircraft Do an inspection of THSA P/N (FIN 1CS), in accordance with TASK 275062-832-801 001 Inspection From Inspection Service Bulletin issuance 90 days None P/N of the THSA is 47175-530 Apply ALS Part 4 None None None DATE: Jul 15/14 SERVICE BULLETIN No.: A340-27-5062 REVISION No.: 00 - Jul 15/14 Page: 4 5 Printed in FRANCE © AIRBUS S.A.S. 2007. All rights reserved.
@A340-500/600
SERVICE BULLETIN Table 1, Config. 001 - Inspection of the THSA P/N (FIN 1CS) Compliance Time Condition Action Threshold Grace Period Repetitive interval Schedule the next THSA maintenance for NBB disks replacement, in accordance with
SUBTASK 275062-200-001 001 Schedule THSA Maintenance (FIN 1CS) And Replace the THSA by a Serviceable One, in accordance with TASK 275062-833-801 001 Repair 3500 FC accumulated by THSA from last NBB disks replacement
- From Oct 31/15, operation of THSA with NBB disks having accumulated more than 6000 FC is not allowed.
- From Apr 30/17, operation of THSA with NBB disks having accumulated more than 5200 FC is not allowed.
- From Apr 30/18, operation of THSA with NBB disks having accumulated more than 4400 FC is not allowed.
- From Apr 30/19, operation of THSA with NBB disks having accumulated more than 3500 FC is not allowed.
None P/N of THSA is 47175-200 or 47175-300 or 47175-500 or 47175-520 Repeat the inspection of the THSA P/N, in accordance with TASK 275062-832-801 001 Inspection None None At each THSA installation F. APPROVAL The technical content of this document is approved under the authority of Design Organisation Approv al 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.
DATE: Jul 15/14 SERVICE BULLETIN No.: A340-27-5062 REVISION No.: 00 - Jul 15/14 Page: 5 5 Printed in FRANCE © AIRBUS S.A.S. 2007. All rights reserved.
@A340-500/600
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 275062-832-801-001: Inspection Get Access
1.00 On Aircraft Schedule THSA Maintenance (FIN 1CS)
0.50 Close-Up
1.00
TOTAL MANHOURS
2.50
ELAPSED TIME (HOURS)
2.50 Task 275062-833-801-001: Repair Get Access
2.00 On Aircraft Install a Serviceable THSA
18.00 Tests
0.50 Close-Up
2.00
TOTAL MANHOURS
22.50
ELAPSED TIME (HOURS)
11.50 NOTE : The minimum manhours necessary to accomplish this Service Bulletin are those for the Inspection. Depending on the inspection result, additional manhours can apply.
H. WEIGHT AND BALANCE Not Changed I. ELECTRICAL LOAD DATA Not Changed J. REFERENCES Airworthiness Limitation Section (ALS) Airworthiness Limitation Section (ALS) Part 4 Aircraft Maintenance Manual (AMM) 06-20-00 06-31-53 06-41-53 12-34-24 27-44-51 52-10-00 Elec. Std. Practices Manual (ESPM) 20-55-00 K. PUBLICATION AFFECTED None DATE: Jul 15/14 SERVICE BULLETIN No.: A340-27-5062 REVISION No.: 00 - Jul 15/14 Page: 6 5 Printed in FRANCE © AIRBUS S.A.S. 2007. All rights reserved.
@A340-500/600
SERVICE BULLETIN L. INTERCHANGEABILITY/MIXABILITY Not Applicable M. SPARES None DATE: Jul 15/14 SERVICE BULLETIN No.: A340-27-5062 REVISION No.: 00 - Jul 15/14 Page: 7 5 Printed in FRANCE © AIRBUS S.A.S. 2007. All rights reserved.
@A340-500/600
SERVICE BULLETIN This Page Intentionally Left Blank DATE: Jul 15/14 SERVICE BULLETIN No.: A340-27-5062 REVISION No.: 00 - Jul 15/14 Page: 8 5 Printed in FRANCE © AIRBUS S.A.S. 2007. All rights reserved.