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.