# Proposed AD FAA-2010-1255: B-N Group Ltd. Model BN-2, BN-2A, BN- 2A-2, BN-2A-3, BN-2A-6, BN-2A-8, BN-2A-9, BN-2A-20, BN-2A-21, BN-2A-26, BN-2A-27, BN-2B-20, BN-2B-21, BN-2B-26, BN-2B-27, BN-2T, and BN-2T-4R Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Comment period closed
- Products: B-N Group
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: December 21, 2010, 75 FR 79990
- Comments due: February 4, 2011
- Docket: FAA-2010-1255 (https://www.regulations.gov/docket/FAA-2010-1255, where comments are filed)
- Project: 2010-CE-059-AD
- FR document: 2010-31983
- Official PDF: https://openairdocs.org/files/sha256/9d/7b/9d7b3a65b69376131c8b5810ff768224343cba7ae574e76e054bb06b55a49cf0 (from https://www.govinfo.gov/content/pkg/FR-2010-12-21/pdf/2010-31983.pdf)
- Federal Register: https://www.federalregister.gov/documents/2010/12/21/2010-31983/airworthiness-directives-b-n-group-ltd-model-bn-2-bn-2a-bn-2a-2-bn-2a-3-bn-2a-6-bn-2a-8-bn-2a-9
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/2B01B540783545358625780000510916.0001
- Page: https://openairdocs.org/proposed/FAA-2010-1255

## Summary

We propose to adopt a new airworthiness directive (AD) for the products listed above. This proposed AD results from mandatory continuing airworthiness information (MCAI) originated by an aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI describes the unsafe condition as:

An event has been reported where Glass Fibre Reinforced Plastic (GFRP) elevator tips have been found deformed on in-service aircraft. The outboard three inches of the elevator tip assembly profiles (top and bottom surfaces) had changed from being convex profiles to concave profiles. There is concern that this could potentially result in, or be caused by, internal structural delamination and/or failure. Such a failure could have a serious effect on the aircraft handling and could potentially result in loss of control of the aircraft.

The proposed AD would require actions that are intended to address the unsafe condition described in the MCAI.

## Notices in this docket

- Dec 21, 2010: Notice of proposed rulemaking (NPRM). (first notice), FR document 2010-31983, comments due Feb 4, 2011 (https://www.federalregister.gov/documents/2010/12/21/2010-31983/airworthiness-directives-b-n-group-ltd-model-bn-2-bn-2a-bn-2a-2-bn-2a-3-bn-2a-6-bn-2a-8-bn-2a-9)

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