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# ALERT SERVICE BULLETIN BAE SYSTEMS (OPERATIONS) LIMITED, PRESTWICK INTERNATIONAL AIRPORT, AYRSHIRE, KA9 2RW, SCOTLAND. J41-A57-029 TRANSMITTAL SHEET This page transmits revision 3 of Service Bulletin J41-A57-029, pages 1thru 14. TITLE: WINGS -INSPECTION OF REAR SPAR FOR CRACKING ALERT INSPECTION BULLETIN
ACTIONS: 1) Remove and discard Alert Inspection Bulletin at revision 2. 2) Insert Alert Inspection Bulletin at revision 3. REASON FOR REVISION: 1) To revise Repeat Inspection Interval (DVI) from 2000 flights to 1600 flights. INCORPORATION OFTHIS REVISION DOES NOT REQUIRE REWORK OF EARLIER REVISIONS OF THIS INSPECTION SERVICE BULLETIN.

ORIGINAL ISSUE: May 06/11 REVISION 3: Apr 08/14 J41-A57-029 PAGE 1 OF 1

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# ALERT SERVICE BULLETIN BAE SYSTEMS (OPERATIONS) LIMITED, PRESTWICK INTERNATIONAL AIRPORT, AYRSHIRE, KA9 2RW, SCOTLAND. J41-A57-029 TITLE: WINGS -INSPECTION OF REAR SPAR FOR CRACKING ALERT INSPECTION BULLETIN 1 . PLANNING INFORMATION A. Effectivity All Jetstream 41 00 aircraft. B. Reason A recent investigation found cracks on a rear spar. There is a risk that if cracking is not detected, the structural integrity of the wing could be compromised. Inspections of all J41 rear spars are required to ensure the continued airworthiness of the fleet. C. Description This Alert Service Bulletin affects the left and right wing rear spars. Detailed visual inspections of the entire rear face of the rear spars are required. NOTE: The operator is provided with the option to carry out the inspection either with the ailerons removed, or with the ailerons deflected, and using a torch and mirror. The tasks are as follows:

- The left and right ailerons are removed or deflected for access, option as required.

- The flaps are lowered to the maximum setting for access.

- Panel 183AB is removed for access.

- The rear spar is cleaned prior to inspection.

- Inspection of the rear spar is done (using a torch and mirror, if required). - A report is sent to BAE SYSTEMS Regional Aircraft.

- Panel 183AB that was removed for access is re-installed.

- The flaps are raised to 0 degree position.

- The left and right ailerons are re-installed (only required if ailerons were previously removed) .

- The aileron control system is adjusted as necessary and tested (only required if ailerons were previously removed). - A Duplicate Inspection is done (only required if ailerons were previously removed).

- The aircraft records are amended. ORIGINAL ISSUE: May 06/11 REVISION 3: Apr 08/14 J41-A57-029 PAGE1

### JIAeJETSTREAJII Ssritls4fiJIJ SERVICE BULLETIN D. Manpower 15 or 25 man hours, depending whether the ailerons are removed. E. Material - Cost and availability None. F. Tooling- Price and Availability None. G. Weight and Balance None. H. Aircraft Noise Levels Aircraft noise is not affected. I. Electrical Load Data Not affected. 

### J. Software Accomplishment Summary None. K. References Aircraft Maintenance Manual, Chapters 6 and 27. Structural Repair Manual. L. Publications Affected None. M. Family Tree of Modification Relationships Not applicable.

ORIGINAL ISSUE : May 06/11 REVISION 3:Apr 08/14 J41-A57-029 PAGE 2N. Approval 

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### JETSTREAIII Sedes4fl111 The technical content of this service bulletin is the subject of EASA Airworthiness Directive consultation. The compliance period for the initial inspection is within 300 flying hours after the effective date of EASA AD 2011-0096. In advance of the inspection, operators are advised that if there is any indication of a fuel leak in the vicinity of the rear spar, the inspection should be performed before further flight. Thereafter a repeat inspection is to be performed every 1600 flights. The compliance period for the repeat inspection is to be within 2000 flights since last inspection. The technical content of this service bulletin is approved under the authority of EASA PART 21 Approval No. EASA.21J.047.


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# ................_ ,/'r:.l!.Y.... ......................... EASA Part21 Approval No. EASA.21J.047.2.

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### 8AeJETSTREAM S.dtls4ffJO SERVICE BULLETIN 2. ACCOMPLISHMENT INSTRUCTIONS DUPLICATE INSPECTION WHENEVER ANY PART OF THIS SYSTEM IS DISMANTLED, ADJUSTED, REPAIRED OR RENEWED, DETAILED INVESTIGATION MUST BE MADE ON COMPLETION TO ENSURE THAT DISTORTION, TOOLS, RAGS OR ANY OTHER LOOSE ARTICLES OR FOREIGN MATTER SUCH AS COULD IMPEDE THE FREE MOVEMENT AND SAFE OPERATION OF THE SYSTEM ARE NOT PRESENT AND THAT THE SYSTEMS AND INSTALLATIONS IN THE WORK AREA ARE CLEAN. WHENEVER ANY PART OF EITHER THE MAIN OR ANY OTHER ASSOCIATED SYSTEM IS DISMANTLED, ADJUSTED, REPAIRED OR RENEWED, THAT PART OF THE SYSTEM THAT HAS BEEN DISTURBED SHALL BE SUBJECTED TO A DUPLICATE INSPECTION FOR SECURITY OF LOCKING DEVICES, FULL AND FREE MOVEMENT, DIRECTION AND TENSION CHECKS AND, FOR AIRCRAFT ON THE BRITISH REGISTER, THE COMPLETION OFTHIS WORK SHALL BE CERTIFIED IN ACCORDANCE WITH THE BRITISH CIVIL AIRWORTHINESS REQUIREMENTS, SECTION A, CHAPTER A6-2 OR THE EQUIVALENT NATIONAL STANDARD. WARNING: MAKE SURE THE AIRCRAFT AND THE AIRCRAFT SYSTEMS ARE MADE SAFE AS DETAILED IN THE APPLICABLE CHAPTERS OF THE AIRCRAFT MAINTENANCE MANUAL. WARNING: THE MINIMUM CLEARANCE BETWEEN MOVING AND STRUCTURAL PARTS MUST BE 0.20 IN (5.10 MM) UNLESS OTHERWISE STATED. CAUTION: DURING CUTTING OR DRILLING OPERATIONS, MAKE SURE STRUCTURE WILL NOT BE DAMAGED AND MAKE SURE THAT ALL UNWANTED MATERIAL IS REMOVED FROM THE WORK AREA. NOTE: Statements 'AMM' refer to the Jetstream Series 4100 Aircraft Maintenance Manual. A. Accomplishment NOTE: The operator is provided with the option to carry out the inspection either with the ailerons removed, or with the ailerons deflected, and using a torch and mirror. (1) Position a DO NOTAPPLY POWER TO THE AIRCRAFT warning sign on the flight deck. (2) Refer to the AMM, Chapter 27-10-35. Remove or deflect the left and right ailerons, option as required. (3) Refer to the AMM, Chapter 27-51-00. Lower flaps to the maximum setting. (4) Refer to the AMM, Chapter 06-40-00. Remove panel 183AB. (5) Clean rear spar using cleaning agent (Material No.11-002) or an approved alternative.

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### (6) Carry out a detailed visual inspection of the rear face of the rear spars, inspecting for cracks,corrosion or other defects (Ref. Figure 1). If the ailerons have not been removed use a torch and mirror to inspect the rear spar in the vicinity of the ailerons. (7) Report all findings (including nil defects) to Customer Technical Support at BAE SYSTEMS, Regional Aircraft, Prestwick International Airport, Ayrshire, KA9 2RW, SCOTLAND (raengliaison@baesystems.com). Any damage must be repaired before further flight. If the damage is outside the limits defined in the Structural Repair Manual (SRM), repair in accordance with an approved BAE SYSTEMS repair scheme and report to Customer Technical Support at the above address. (8) If no cracks are found, or following corrective action, refer to the AMM , Chapter 27-51-00. Raise flaps to the 0 degrees setting. (9) Refer to the AMM , Chapter 27-10-35. Install the left and right ailerons (only required if ailerons were previously removed). (10) Refer to the AMM, Chapter 27-10-00. Carry out test of aileron control system (only required if ailerons were previously removed). (11) Do aduplicate inspection of the aileron system (only required if ailerons were previously removed). (12) Refer to the AMM, Chapter 06-40-00. Install panel 183AB. (13) Remove warning notice from flight deck. (14) Aircraft records: (a) Add Service Bulletin number 'J41-A57-029' to the aircraft records.

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### PAGE6REPORTING DATA Operator 

# ITotal flying hours Total landlnga

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Reglatretlon Bullc:l number Inspection dote

WING REAR SPARS - INSPECTION FIGURE 1 RIB 1 I

57 50 10069 Inspection method



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### J41-A57-029 PAGE83. MATERIAL INFORMATION None.

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### 4. CONTINUED AIRWORTHINESS 

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### JETSTREAIII S.des41'1111 A. Continued Airworthiness Instructions There are no continued airworthiness instructions applicable to this service bulletin. 

### B. Scheduled Maintenance (1) Not applicable. 

## c. Removal Procedures (1) Not applicable. D. Installation Procedures (1) Not applicable. E. Test Procedures (1) Not applicable. F. Trouble Shooting (1) Not applicable.

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# 4"'" OPERATOR REPORT FORM This Operator Report Form is required to be completed and returned to: BAE SYSTEMS Regional Aircraft, Customer Engineering Liaison, Building 37, Prestwick International Airport, Ayrshire, KA9 2RW, SCOTLAND. Tel No. +44 (0) 1292 67 5276. Fax No. 01292 675432. Title 

# IWings- Inspection of Rear Spar for Cracking. Service Bulletin Operator Aircraft No. Registration No. J41-A57-029 

### Revision 3. Aircraft Constructors No. Flying Hours No. of landings
Description of inspection results, include all marked up figures and sketches:

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