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B- N SERVICE
AIRCRAFT BULLETIN Britten-Norman Aircraft Limited.
BEMBRIDGE, Isle of Wight, United Kingdom PO35 5PR Models Affected Service Bulletin number All BN2A, BN2B and BN2T series Islander aircraft. BN-2/SB 313 Issue 3 - 24/02/2009 Elevator Tip Assemblies - Inspection Reason for Change This Service Bulletin has been revised to Issue 3 to clarify inspection procedures and to add a terminating action.
1 Compliance Statement Britten-Norman Aircraft Limited highly recommends that all operators and maintenance organizations comply with this Service Bulletin.
Do the inspection procedure of this Service Bulletin at the earliest opportunity after receipt of this Service Bulletin, or at the next daily check (check A).
2 Introduction An event has been reported to Britten-Norman Aircraft Limited where the profiles of the elevator tip assemblies (NB 31-235) have changed.
The outboard three inches of the elevator tip assembly profiles (top and bottom surfaces) have changed from being convex profiles to concave profiles.
WARNING The glass reinforced plastic (GRP) elevator tip assemblies may delaminate. This could have a serious effect on the aircraft handling.
3 Applicability This Service Bulletin is applicable to all BN 2A, BN 2B and BN 2T series Islander aircraft.
4 Weight and Balance None.
24/02/2009 BN-2/SB 313 Issue 3 Page 1 of 5
Service Bulletin 5 Effect on Publications The aircraft publications will be amended as necessary by normal revision action at the earliest opportunity.
6 Action Carry out an inspection of the left and right elevator tip assemblies (top and bottom surfaces) to ascertain whether the profile has changed.
6.1 Inspection 1 Refer to Fig 1 and Fig 2.
2 Examine the outboard three inches of the elevator tip assemblies (left and right).
Ensure that the profiles of the top and bottom surfaces of the elevator tip assemblies do not show signs of concavity (refer to section 9.2).
Figure 1 - Elevator Tip Assemblies BN-2/SB 313 24/02/2009 Page 2 of 5 Issue 3
Service Bulletin
6.2 Failures Please report the extent of any findings to the Head of Structural Engineering at Britten-Norman Aircraft Limited, who will then advise as to the acceptability of the aircraft continuing in service, by:
Post: Britten-Norman Aircraft Limited, Bembridge Airport, Isle of Wight. PO35 5PR United Kingdom Telephone: +44 (0) 20 3371 4000 Facsimile: +44 (0) 20 3371 4001 E-mail: structural@bnaircraft.com 7 Manpower This Service Bulletin can be completed in approximately one man-hour.
8 Provisioning For more information, contact the Customer Support Department at B-N Group Limited, by:
• Post: B-N Group Limited, Bembridge Airport, Isle of Wight. PO35 5PR United Kingdom Telephone: +44 (0) 20 3371 4000 Facsimile: +44 (0) 20 3371 4001 E-mail: into@britten-norman.com 9 Follow-on Action
9.1 No Concavity No further action required.
9.2 Concavity 1 Confirm the degree of concavity (depth of depression below straight line) to Head of Structural Engineering, refer 6.2.
2 The immediate action on finding concavity is to check for delamination. If ultrasonic test gear is available this may be used otherwise a simple coin 'tap' test will suffice.
In the event of any delamination being detected the aircraft should be grounded until the tip(s) are replaced.
4 Provided no delamination is detected then the aircraft is safe to return to service. The concavity and delamination checks should be repeated periodically - every 50 flying hours - until the tip(s) are replaced. However, the elevator tip(s) must be replaced within 6 months from the issue date of this Service Bulletin 313 at Issue 3.
Note. If delamination found during the 50 hour checks, the aircraft should be grounded until the elevator tip(s) are replaced.
24/02/2009 BN-2/SB 313 Issue 3 Page 3 of 5
Service Bulletin Check for Concavity Refer to Para 9.2 Concavity No Return to service. No further found? inspections required Yes Check for Delamination A/C returned to service with 50 hour checks until elevator Delamination No tip replaced. The elevator tip found? must be replaced within six months from date of Yes, Service Bulletin 313 (Issue 3).
A/C grounded until elevator tip replaced Return to service.
No further inspections required PC-A-573000-A-U0625-00008-A-01-1 Figure 2 - Inspection Flow Chart BN-2/SB 313 24/02/2009 Page 4 of 5 Issue 3
Service Bulletin 10 Approval The technical content of this document is approved under the authority of DOA number EASA.
21J. 138.
Signed. D. Shan D.Shon Date 24 fel 2009 24/02/2009 BN-2/SB 313 Issue 3 Page 5 of 5