# AD 76-21-07: Engine Mounting - Type: Airworthiness directive - Status: Current - Products: B-N Group BN-2A, BN-2A-2, BN-2A-20, BN-2A-21, BN-2A-26, BN-2A-27, BN-2A-3, BN-2A-6, BN-2A-8, BN-2A-9, BN2A MK. III, BN2A MK. III-2 and 1 more - Effective: November 5, 1976 - Superseded by: Nothing supersedes this AD - Product type: Aircraft, Small airplane - Amendment: 39-2752 - Registered aircraft: 51 may be affected, by airframe or engine model (OpenAirDocs) - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/C6E8744EDB6C0B2986256A34005C8AFC.0001 - DRS record last changed: May 30, 2024 - Page: https://openairdocs.org/ad/76-21-07 ## The airworthiness directive 76-21-07 BRITTEN-NORMAN LTD: Amendment 39-2752. Applies to Models BN-2A and BN-2A MK III airplanes, all series, certificated in all categories. Compliance is required within the next 25 hours time in service after the effective date of this AD or before 2 years since new, whichever occurs later, unless already accomplished. To detect corrosion and cracks on the forward face of the engine mounting brackets and prevent possible engine separation, accomplish the following: (a) Inspect the forward face of the engine mounting brackets, P/N NB-20-3463 (BN- 2A) and P/N NB-20-5781 (BN-2A MK III), for corrosion and cracks, in accordance with paragraphs 1 and 2 of the section entitled "Inspection" of Britten-Norman Service Bulletin BN-2/SB,91, issue 1, dated March 23, 1976, or an FAA-approved equivalent. (b) If, during the inspection required by paragraph (a) of this AD, no corrosion is found, re-assemble the engine mounting brackets in accordance with paragraphs 3 and 4of the section entitled "Inspection" of Britten-Norman Service Bulletin BN-2/SB, 91, issue 1, dated March 23, 1976, or an FAA-approved equivalent. (c) If, during the inspection required by paragraph (a) of this AD, minor surface corrosion is found and the bracket surface is free of any pitting, repair and re-assemble the engine mounting brackets in accordance with paragraph 1 of the section entitled "Rectification" of Britten-Norman Ltd. Service Bulletin BN-2/SB.91, issue 1, dated March 23, 1976, or an FAA- equivalent. (d) If, during the inspection required by paragraph (a) of this AD, severe corrosion which is evidenced by surface pitting or a crack is found, replace the engine mounting brackets with new parts of the same part number in accordance with paragraph 2 of the section entitled "Rectification" of Britten-Norman Ltd., Service Bulletin BN-2/SB.91, issue 1, dated March 23, 1976, or an FAA-approved equivalent. This amendment becomes effective November 5, 1976. ## Affected data sheets (2) (OpenAirDocs) The type certificate data sheets whose models the AD names. - [TCDS A17EU](https://openairdocs.org/tcds/A17EU): Britten-Norman Aerospace Ltd.; names 10 of 18 models: BN-2A-2, BN-2A-9, BN-2A-26, BN-2A-27, BN-2A-3, BN-2A-8, BN-2A-20, BN-2A-21… - [TCDS A29EU](https://openairdocs.org/tcds/A29EU): Britten-Norman Aerospace Ltd.; names 3 of 3 models: BN2A MK. III, BN2A MK. III-2, BN2A MK. III-3 ## Registered aircraft it may apply to (OpenAirDocs) Matched by airframe and engine model; the AD's applicability may narrow it by serial number, part number or equipment. - Aircraft: 51 (51 by airframe model, 0 by engine model) - Makers: Britten-Norman 46, Britten Norman 3, B-N Group 1, Pilatus Britten-Norman 1 Models with the most aircraft: - [Britten-Norman BN2A-26 ISLANDER](https://openairdocs.org/model/britten-norman-bn2a-26-islander): 14 aircraft (airframe model) - [Britten-Norman BN-2A](https://openairdocs.org/model/britten-norman-bn-2a): 8 aircraft (airframe model) - [Britten-Norman BN-2A-8](https://openairdocs.org/model/britten-norman-bn-2a-8): 8 aircraft (airframe model) - [Britten-Norman BN-2A-27](https://openairdocs.org/model/britten-norman-bn-2a-27): 5 aircraft (airframe model) - [Britten-Norman BN-2A-9](https://openairdocs.org/model/britten-norman-bn-2a-9): 4 aircraft (airframe model) - [Britten-Norman BN-2A-20](https://openairdocs.org/model/britten-norman-bn-2a-20): 3 aircraft (airframe model) - [Britten Norman BN-2A MK III](https://openairdocs.org/model/britten-norman-bn-2a-mk-iii): 2 aircraft (airframe model) - [Britten-Norman BN-2A-21](https://openairdocs.org/model/britten-norman-bn-2a-21): 2 aircraft (airframe model) - [Britten-Norman BN-2A-6](https://openairdocs.org/model/britten-norman-bn-2a-6): 1 aircraft (airframe model) - [Britten Norman BN 2A MKIII 2](https://openairdocs.org/model/britten-norman-bn-2a-mkiii-2): 1 aircraft (airframe model) - [B-N Group BN-2A-26](https://openairdocs.org/model/b-n-group-bn-2a-26): 1 aircraft (airframe model) - [Britten-Norman BN-2A-26](https://openairdocs.org/model/britten-norman-bn-2a-26): 1 aircraft (airframe model) - [Pilatus Britten-Norman BN-2A-26](https://openairdocs.org/model/pilatus-britten-norman-bn-2a-26): 1 aircraft (airframe model) All 13 models: https://openairdocs.org/ad/76-21-07/models.md Every aircraft: https://openairdocs.org/ad/76-21-07/aircraft.md Its text cites no advisory circulars or STCs. --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.