Airworthiness Directive · Amendment 39-18861 · Landing gear
GROB Aircraft AG Gliders
This AD applies to GROB Aircraft AG Models GROB G 109 and GROB G 109B gliders, all serial numbers, certificated in any category.
We are adopting a new airworthiness directive (AD) for GROB Aircraft AG Models GROB G 109 and GROB G 109B gliders. 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 broken pivots of the tail wheel mounting bracket resulting from corrosion and damage due to wear. 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 the next 3 months after May 31, 2017 (the effective date of this AD) or 100 hours time-in-service (TIS) after May 31, 2017 (the effective date of this AD), whichever occurs first, and repetitively thereafter at intervals not to exceed every 100 hours TIS or 12 months, whichever occurs first, inspect the tail wheel mounting bracket following the Accomplishment Instructions in section 1.8 of GROB Aircraft AG Service Bulletin (SB) No. MSB817-70, dated September 28, 2016.
(2) If any damage is found during any inspection required in paragraph (f)(1) of this AD, before further flight, repair following GROB Aircraft AG Repair Instruction RI 817-015, dated September 16, 2016.
Note 1 to paragraph (f)(2) of this AD: The bolt in Figure 1, Pos. 10 of GROB Aircraft AG Repair Instruction RI 817-015, dated September 16, 2016, is welded into place onto the steel base plate. Therefore, in order to facilitate the removal of the bolt, the welding seams may be carefully ground off using caution to not damage the steel base plate, instead of completely cutting off the bolt head.
(3) Repairs made as required by paragraph (f)(2) of this AD do not qualify as terminating action for the repetitive inspections required in paragraph (f)(1) of this AD.
