U

.S

. Department of Transporta tion Federal Aviation Administration



## fEB 2 4 2015 C hri s tian Klix Pac i fie AeroSport. LL C I 7705 49th Drive NE Arlington, WA 98223 Small Airplane Directorate 901 Locust , Room 301 Kansas City. Missouri 64110

Subject: Global Alternat ive Method of Compliance (AMOC) request fo r A ir worthi ness Directi ve (AD) 20 12- 10-1 I , Docket No. F AA-20 I 2-0324; Directorate ldenti fier 20 12-CE-008- AD for the Burkhart GROB Luft- und Raumfahrt Gmb H Models GROB G I 09 and GROB G I 098 Powered Sailplanes. Dear Mr. Kl i x: Thi s is in respon se to yo ur letter, dated Febru ary I 9, 20 15 , to Mr. Jim Ruth e r ford, Aerospace Engineer , FAA Small Airp l a ne Directorate , requ es ting a new AMOC for u se of new ly relea sed service informat ion to accomplis h the requirem e nt s of parag raph 

### (f)( I )(i ii ) of AD 20 12

- 10- I I for Burkhart GROB Luft

- und Raumfahrt GmbH M o d e ls G ROB G 1 09 and GROB G I 098 powered sailplanes. Since the newly released serv ice information is applicable to all affected G I 09 and G I 09B powered sa ilplanes , this AMOC wou ld be allowed for use by all operato rs . Paragraph (f)(l)(iii) of A D 2012-10 -11 requires use of an access panel hole. installed per paragraph (f)(l )(ii) of the sa me AD, to accomplish an in spec tion , from below, of the ve rtical s tabilizer nose plate for co rro s ion and flak in g following Part B of the Acco mpli s hment In structions in Grob Aircraft Service Bu ll et in (SIB) No
. MSB8 I 7-58, dated Nove mber 24, 20 I I
. Thereafter, the in spec tion is to be repeate d at inte rv a ls not to exceed 12 month s. You state that some of th e affected sailplanes have th e no se plate e nc apsu lated in fiberglass laminates. When this occurs , it i s inferred that the Part B Accomplishment Instructions from the se rvice information are not a d equate in add r essing how to proceed. You th erefore
. request to perform the inspection defined in paragraph (f)(l)(i ii ) in accordance with Part B ofthe Accomplishment In stru ct io n s i n the newl y released Grob Aircraft S / 8 No. MSB817-58/l, dated February 17 , 2015. T hi s new service in fo r ma ti on replaces Grob A ircraft S/B No. MSB817- 58, date d Novembe r 24, 20 I I and pro vide s add itional information in Part B of the Accomplishment In s truction s . Th e new revis ion adds th e abil it y to u se other sui tab le means, such as a digital camera or a borescope. to accom p l is h the inte rn a l inspection of the nose plate, and it also provides instructions o n how to determine i f corrosio n is present on the nose plates covered by composite laminates. The FA A has reviewed your formal AMOC requ est a nd the late s t company serv ic e infom1ati on. Based on previou s conversations with you on thi s issue, the FAA had a lready sha r e d this concern w ith the E uropean A vi atio n Safety Agency (EASA), who is the state of des ign a uth o rity for theseaircraft. EASA had then coordinated th e req ues t w ith the TC H o lder. Grob A ircraft AG. S ub se quently , Grob Aircraft made the deci s ion to rev ise the service inf o rm ation to add more clarification and thi s was approved under their privil eges as an EASA D es ig n O rganization (DOA). The FAA note s that AD 20 12 -10-11 , also requir es th e use ofGrob A irc raft S / 8 No. MSB817- 58. d a t ed Nove mber 24
. 20 I I , to accomplish an ex t e rnal inspection of the nose plate in paragraph 

### ( f)( l )( i) and to s p ec if y th e part replace ment in s truction s in paragraph (!)(2)
. The new l y released S / 8 does not chang e th e in s tru ct io ns re lated to th ese ac ti o n s . After further consideration , the FAA appro ves the u se of Grob Aircraft S/ 8 No. MSB817-58 / I , dated February 17 , 2015 , in place of Grob Aircraft S / 8 No. MS8817-58 , dated Novembe r 24 , 20 I I , as an alternativ e m e th od of compliance to accomplish the requir e m e nt s of paragraphs (t)(l)(i) , (f)(l )( iii ), and (f)(2) of AD 2012-10-1 

### I. B efo re u s in g thi s AMOC, operators are to no tif y th e ir appropriate principal i n s p ecto r ( PI )
. o r lack ing a principa l in s p ec tor . the mana ge r o f th e l oca l fli g ht standard s di s tri c t of fic e/ certificate ho lding di s tri ct office
. Thi s a pprova l is s ubj ect to th e fo ll owing co nditi o n s : 1. Th e Small A irp l ane Directorate will r evo ke thi s AMOC, if we late r d ete rmine that thi s AMOC doe s n ot p rov id e an acceptab le leve l of safety
. 2
. All provision s of AD 2012 -10-11 that are not s pecifically ref e renced a b ove remain fully applicabl e and mu s t be complied with acco rdin g ly. 3
. A copy of thi s le tt e r is kept wi th the airc ra ft log b ook. If a ll th e above co nditi o n s a r e me t , this AMOC is g rant ed for all affect ed G R08 G 109 a nd GROB G I 09B power e d sa ilplane s. certificat e d in any category. This AMOC is tr ansfe rab le . If yo u have any qu est io n s o r require additional inf o nn ation , please contact Mr. Jim Rutherford b y tel e phone at 816- 329 -4165 , by fax at 81-329-4090 , o r b y email at jim.ruthcrf o rd r £/ faa
. u o \'. S i nce r e ly,



# ~?E: Mana ge r , Project Support Branch



### 2

### cc: Mr
. Ullr i ch Kopp Luftfahrt- Bundesamt T321 Segelflugzeuge und Moto rseg l er Hermann-Bienk-Strasse 26 D-381 08 Braunschweig Germany



### 3