Airworthiness Directive · Amendment 39-17421 · Stabilizers
Grob-Werke Airplanes
This AD applies to GROB-WERKE G115EG airplanes, all serial numbers, certificated in any category.
We are adopting a new airworthiness directive (AD) for Grob- Werke Model G115EG airplanes. 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 cracks in the elevator trim tab arms on several Grob G 115 airplanes, which could result in failure of the part and consequent loss of control. We are issuing this AD to require actions to address the unsafe condition on these products.
Unless already done, do the following actions following Grob Aircraft Service Bulletin No. MSB1078-186/3, dated August 3, 2012.
(1) Within the next 50 hours time-in-service (TIS) after May 23, 2013 (the effective date of this AD) and repetitively thereafter at intervals not to exceed 200 hours TIS, inspect both left hand (L/H) and right hand (R/H) elevator trim tab arms, part number (P/N) 115E-3758, using a nondestructive testing (NDT) method such as a dye-penetrant or eddy-current that is beyond just a visual inspection.
(2) If during any inspection required in paragraph (f)(1) of this AD a crack is found, before further flight, replace the affected elevator trim tab arm with P/N 115E-3758/1. The replacement of an elevator trim tab arm with P/N 115E-3758/1 will terminate the repetitive inspection requirement for that trim tab arm. Replacement of both R/H and L/H trim tab arms with P/N 115E-3758/1 will terminate the repetitive requirement in paragraph (f)(1) of this AD.
(3) Replacement at any time of an elevator trim tab arm with P/N 115E-3758/1 will terminate the repetitive requirement in paragraph (f)(1) of this AD for that elevator trim tab arm. Replacement of both R/H and L/H trim tab arms with P/N 115E-3758/1 will terminate the repetitive requirement in paragraph (f)(1) of this AD.
This AD provides credit for the actions required in this AD if already done before the effective date of this AD following Grob Aircraft Service Bulletin No. MSB1078-186/2, dated March 28, 2012; Grob Aircraft Service Bulletin No. MSB1078-186/1, dated March 8, 2012; or Grob Aircraft Service Bulletin No. MSB1078-186, dated February 15, 2012.
