Airworthiness directives › 2013-08-04
AD 2013-08-04 Airworthiness Directives; Grob-Werke Airplanes
Applicability*9
This AD applies to GROB-WERKE G115EG airplanes, all serial numbers, certificated in any category.
Compliance
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.
Required actions
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.
Unsafe condition
This AD was prompted by the discovery of 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. The Model G115EG airplane is the only airplane type-certificated in the United States with the same part numbers and similar configuration as the airplane model described in the MCAI. We are issuing this proposed AD to detect cracks and prevent the part from failing.
Affected ADs
None.
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