Airworthiness Directive · Amendment 39-17060 · Stabilizer
Burkhart GROB Luft- und Raumfahrt GmbH Powered Sailplanes
This AD applies to Burkhart GROB Luft- und Raumfahrt GmbH Models GROB G 109 and GROB G 109B powered sailplanes, all serial numbers, certificated in any category.
We are adopting a new airworthiness directive (AD) for all Burkhart GROB Luft- und Raumfahrt GmbH Models GROB G 109 and GROB G 109B powered sailplanes. This AD results from mandatory continuing airworthiness information (MCAI) issued 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 excessive corrosion on the nose plate in the vertical stabilizer, which could cause the vertical stabilizer nose plate to fail. We are issuing this AD to require actions to address the unsafe condition on these products.
Unless already done, do the following actions:
(1) Within 3 months after July 9, 2012 (the effective date of this AD):
(i) Inspect, from the top, the front and rear side of the nose plate, part number (P/N) 109-2160.01, in the vertical stabilizer for corrosion and flaking following Part A of the Accomplishment Instructions in Grob Aircraft Service Bulletin No. MSB817-58, dated November 24, 2011. Repetitively thereafter inspect at intervals not to exceed 12 months.
(ii) Install an access panel on the left side of the vertical stabilizer following Grob Aircraft Repair Instruction Doc. No. RI 817-010/1, issue date December 20, 2011, as specified in Grob Aircraft Service Bulletin No. MSB 817-060, dated November 24, 2011.
(iii) Through the access panel installed as required in paragraph (f)(1)(ii) of this AD, inspect, from below, the nose plate, P/N 109-2160.01, for corrosion and flaking following Part B of the Accomplishment Instructions in Grob Aircraft Service Bulletin No. MSB817-58, dated November 24, 2011. Repetitively thereafter inspect at intervals not to exceed 12 months.
(2) If any corrosion or flaking is found on the nose plate, P/N 109-2160.01, during any inspection required in paragraphs (f)(1)(i) or (f)(1)(iii) of this AD, replace P/N 109-2160.01 with a serviceable part. Do the replacement following Grob Aircraft Repair Instruction Doc. No. RI 817-009, issue date November 17, 2011, as specified in Grob Aircraft Service Bulletin No. MSB817-58, dated November 24, 2011. After replacement, continue with the repetitive inspections required in paragraphs (f)(1)(i) and (f)(1)(iii) of this AD.
