TITLE: WINGS - INSPECTION OF FORWARD PYLON PICK UP FITTINGS AT RIB 10 1.Planning information A.Effectivity (1) Aircraft Aircraft affected by this inspection are defined below :- All BAe 146 100, 200, 300 Series All BAe 146-301 Series All AVRO 146-RJ70, RJ85, RJ100 Series Check the aircraft technical records for previous accomplishment of this inspection. B.Reason Stress corrosion cracking has been discovered in the forward pylon pick up fitting flanges at Rib 10. Failure of the Pylon Pick Up Fittings could affect the Continued Airworthiness of the Structure. C.Description (1) The existing Corrosion Prevention and Control Programme task C57-500-05-01 will be superseded by this Inspection Service Bulletin (ISB) when the service bulletin is subject to EASA Airworthiness Directive action. (2) It is necessary to carry out an inspection for stress corrosion cracking of the forward pylon pick up fittings (top and bottom) at Rib 10. (3) Due to the low accessibility of the area, the use of a videoscope is required (Ref: NTM Part 9, 20-09-01). Work comprises:

- Position ground equipment for access to both left and right outboard forward pylon pick up fittings.

- Display warning notices on flight deck prohibiting the use of flying controls or engine controls.

- Remove Panels 454AB, 454AT, 484AB and 484AT.

- Perform a Special Detailed Inspection of the forward pylon pick up fitting flanges at Rib 10. BAE SYSTEMS (Operations) Limited, Prestwick International Airport, Ayrshire, KA9 2RW, Scotland. INSPECTION SERVICE BULLETIN BAe 146 SERIES/AVRO 146-RJ SERIES AIRCRAFT

Date: 06-SEP-2010 ISB.57-073 Revision: 1 27-JAN-2012 Page 1 of 14 Printed in England- Re-fit Panels 454AB, 454AT, 484AB and 484AT.

- Remove ground equipment.

- Remove warning notices from flight deck.

- Complete and return Inspection Report Form (Appendix 1). D.Compliance The technical content of this ISB is the subject of EASA AIRWORTHINESS DIRECTIVE consultation. Compliance with this ISB is to be achieved as follows: (1) The initial fatigue and environmental inspection must be accomplished as shown below: (a) Aircraft more than 15 years since entry into service at receipt of this ISB: - Inspections should be carried out in accordance with para. 2 within 1 year of initial issue of this ISB. (b) Aircraft between 14 and 15 years since entry into service at receipt of this ISB: - Inspections should be carried out in accordance with para. 2 within 2 years of initial issue of this ISB, or prior to achieving 16 years since entry into service, whichever is the earlier. (c) Aircraft less than 14 years since entry into service at receipt of this ISB: - Inspections should be carried out in accordance with para. 2 within 2 years of initial issue of this ISB. (d) For aircraft that have had a replacement forward pylon pick up fitting installed inspections should be carried out in accordance with para. 2 within 2 years of Revision 1 of this ISB. (2) Thereafter, repeat inspections in accordance with para. 2 at an interval not to exceed 2 years. E.Approval The technical information contained in this document has been approved under the authority of EASA Part 21 Approval No. EASA.21J.047. INSPECTION SERVICE BULLETIN BAe 146 SERIES/AVRO 146-RJ SERIES AIRCRAFT

Date: 06-SEP-2010 ISB.57-073 Revision: 1 27-JAN-2012 Page 2 of 14 Printed in EnglandF.Manpower To inspect as defined in para.2-2 man-hours. This man-hourestimate does not include time forgaining access to, orcleaning the inspection area. G.Materials - cost and availability None. H.Tooling - cost and availability None. I.Weight and balance Not Affected. J.References Aircraft Maintenance Manual - Chapter 6 and Chapter 12 Non-Destructive Testing Manual - Part 9, 20-09-01 Structural Repair Manual - Chapter 51-00-00 K.Publications affected Maintenance Review Board Report. Maintenance Planning Document. Corrosion Prevention and Control Programme. NOTE: The MRBR, MPD and CPCP will be reviewed for inclusion of a scheduled task. When the inspection requirements and procedures of this service bulletin are published in the MRBR, MPD and CPCP this ISB will be cancelled orrevised to refer to the MRBR, MPD and CPCP as the EASA agreed published sources. L.Electrical load data Not applicable. M.Software accomplishment summary No effect. INSPECTION SERVICE BULLETIN BAe 146 SERIES/AVRO 146-RJ SERIES AIRCRAFT

Date: 06-SEP-2010 ISB.57-073 Revision: 1 27-JAN-2012 Page 3 of 14 Printed in EnglandN.Aircraft noise levels No effect. INSPECTION SERVICE BULLETIN BAe 146 SERIES/AVRO 146-RJ SERIES AIRCRAFT

Date: 06-SEP-2010 ISB.57-073 Revision: 1 27-JAN-2012 Page 4 of 14 Printed in England2.Accomplishment instructions A.General (1) The following abbreviations are used within this document :- AMM - Aircraft Maintenance Manual. SRM - Structural Repair Manual. MRBR - Maintenance Review Board Report. NTM - Non Destructive Testing Manual. CPCP - Corrosion Prevention and Control Manual. (2) Observe all WARNINGS and CAUTIONS appearing in the Aircraft Maintenance Manual. B.Preparation

WARNING: WHENEVER ANY PART OF THE MAIN OR ASSOCIATED CONTROL SYSTEM IS DISMANTLED, ADJUSTED, REPAIRED OR RENEWED, THAT PART OF THE SYSTEM WHICH HAS BEEN DISTURBED SHALL BE SUBJECTED TO A SECOND INDEPENDENT INSPECTION FOR SECURITY OF LOCKING DEVICES, FULL AND FREE MOVEMENT, DIRECTION AND TENSION CHECKS. THIS WORK MUST BE DONE IN ACCORDANCE WITH THE ACCEPTABLE MEANS OF COMPLIANCE M.A. 402 (a) TO EASA PART M, OR TO AN EQUIVALENT NATIONAL STANDARD. WARNING: WHENEVER ANY PART OF THE MAIN OR ASSOCIATED CONTROL SYSTEM IS DISMANTLED, ADJUSTED, REPAIRED OR RENEWED, THAT PART OF THE SYSTEM WHICH HAS BEEN DISTURBED SHALL BE SUBJECTED TO A DUPLICATED INSPECTION FOR SECURITY OF LOCKING DEVICES, FULL AND FREE MOVEMENT, DIRECTION AND TENSION CHECKS, THE COMPLETION OF THIS WORK SHALL BE CERTIFIED IN ACCORDANCE WITH EASA Part 21 Approval No. EASA.21J.047. (1) Display warning notices on flight deck prohibiting the use of flying controls or engine controls. (2) Referto AMM Chapter12 and position ground equipment for access to both left and right outboard forward pylon pick up fittings. (3) Referto AMM Chapter06-40-00 and remove Panels 454AB, 454AT, 484AB and 484AT. INSPECTION SERVICE BULLETIN BAe 146 SERIES/AVRO 146-RJ SERIES AIRCRAFT

Date: 06-SEP-2010 ISB.57-073 Revision: 1 27-JAN-2012 Page 5 of 14 Printed in EnglandC.Inspection (1) Using a videoscope, perform a Special Detailed Inspection in accordance with NTM Part 9, 20-09-01, for cracking, corrosion and other defects of the Rib 10 forward pylon pick up fitting flanges, especially the top and bottom flanges (see Drawing 1). (2) Also check fittings for indicated signs of moisture ingress between the mating surfaces. (3) Rectify any defects found before further flight to an approved BAE SYSTEMS repair scheme. Refer to SRM 51-00-00. Re-protect the structure as required. (4) Installation of replacement fittings will need to be performed with guidance from BAE SYSTEMS Repair Design Office on a case by case basis. Replacing a fitting may also involve a skin repair. (5) Make certain area is clean and clear of tools and miscellaneous equipment. D.Close up (1) Re-fit Panels 454AB, 454AT, 484AB and 484AT. (2) Remove ground equipment from inspection area. (3) Remove warning notices on flight deck prohibiting the use of flying controls or engine controls. (4) Make certain work area is clean, and clear of tools and miscellaneous equipment. E.Test None. F.Documentation (1) Record accomplishment of this inspection in the Aircraft technical records. G.Terminating action None. INSPECTION SERVICE BULLETIN BAe 146 SERIES/AVRO 146-RJ SERIES AIRCRAFT

Date: 06-SEP-2010 ISB.57-073 Revision: 1 27-JAN-2012 Page 6 of 14 Printed in EnglandFORWARD PYLON PICK UP FITTINGS AT RIB 10 DRAWING 1. INSPECTION SERVICE BULLETIN BAe 146 SERIES/AVRO 146-RJ SERIES AIRCRAFT

Date: 06-SEP-2010 ISB.57-073 Revision: 1 27-JAN-2012 Page 7 of 14 Printed in EnglandThis Page Is Intentionally Left Blank. INSPECTION SERVICE BULLETIN BAe 146 SERIES/AVRO 146-RJ SERIES AIRCRAFT

Date: 06-SEP-2010 ISB.57-073 Revision: 1 27-JAN-2012 Page 8 of 14 Printed in England3.Material information A.Replacement Parts (if required) Table 1. Modification Status Assembly (Replacement Part

to be Ordered)* Description

Aircraft Pre Modification HCM0851A HC574H0001-002** Bracket AB Assembly Port - Pre Mod HCM0851A HC574H0001-004** Bracket CD Assembly Port - Pre Mod HCM0851A HC574H0001-003** Bracket AB Assembly Stbd - Pre Mod HCM0851A HC574H0001-005** Bracket CD Assembly Stbd - Pre Mod HCM0851A Aircraft Post Modification HCM0851A HC574H0053-002** Bracket AB Assembly Port - Mod HCM0851A HC574H0053-004** Bracket CD Assembly Port - Mod HCM0851A HC574H0053-003** Bracket AB Assembly Stbd - Mod HCM0851A HC574H0053-005** Bracket CD Assembly Stbd - Mod HCM0851A NOTE: * Replacement Parts should be ordered as matched pairs (ie AB orCD). ** Mod HCM0851A brackets (HC574H0053-00X) can be fitted in lieu of the Pre Mod HCM0851A brackets provided additional actions are carried out as part of the installation. Referto BAE Systems RepairDesign Office. If replacement brackets are installed, their life must be tracked in the aircraft records. INSPECTION SERVICE BULLETIN BAe 146 SERIES/AVRO 146-RJ SERIES AIRCRAFT

Date: 06-SEP-2010 ISB.57-073 Revision: 1 27-JAN-2012 Page 9 of 14 Printed in EnglandThis Page Is Intentionally Left Blank. INSPECTION SERVICE BULLETIN BAe 146 SERIES/AVRO 146-RJ SERIES AIRCRAFT

Date: 06-SEP-2010 ISB.57-073 Revision: 1 27-JAN-2012 Page 10 of 14 Printed in England

### APPENDIX 1 1.INSPECTION REPORT A.Complete and return this form as detailed

OPERATOR: AIRCRAFT REGISTRATION: CONSTRUCTORS NUMBER: FLIGHT HOURS: LANDINGS: DATE INSPECTION PERFORMED: FINDINGS:

To: CustomerLiaison, CustomerSupport (Building 37), BAE SYSTEMS (Operations) Limited, Prestwick International Airport, Ayr, KA9 2RW, Scotland. Fax + 44 (0) 1292 675432 e-mail raengliaison@baesystems.com INSPECTION SERVICE BULLETIN BAe 146 SERIES/AVRO 146-RJ SERIES AIRCRAFT

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Date: 06-SEP-2010 ISB.57-073 Revision: 1 27-JAN-2012 Page 12 of 14 Printed in England

### APPENDIX 2 1.CONTINUED AIRWORTHINESS INSTRUCTIONS (1) There are no continued airworthiness instructions applicable to this service bulletin. A.Scheduled Maintenance (1) None. B.Removal Procedures (1) None. C.Installation Procedures (1) None. D.Test Procedures (1) None. E.Troubleshooting (1) None. INSPECTION SERVICE BULLETIN BAe 146 SERIES/AVRO 146-RJ SERIES AIRCRAFT

Date: 06-SEP-2010 ISB.57-073 Revision: 1 27-JAN-2012 Page 13 of 14 Printed in EnglandThis Page Is Intentionally Left Blank. INSPECTION SERVICE BULLETIN BAe 146 SERIES/AVRO 146-RJ SERIES AIRCRAFT

Date: 06-SEP-2010 ISB.57-073 Revision: 1 27-JAN-2012 Page 14 of 14 Printed in England