L , II p. - — Cobha m Avionic s Chelto n Avionic s Inc
. Db a Wulfsber g Electronic s 640 0 Wilkinso n Driv e Prescott , Az
. 8633 4 T : (928 ) 708-155 0 F : (928 ) 541-762 7 PAA.-2oVO-0\3 S Februar y05 , 201 0 Docke t Managemen t Facility U S Departmen t o fTransportatio n 120 0 NewJerse yAvenue , SE Wes t Buildin g Groun d Floo r Roo m W12-14 0 Washington , D

C 2059 0 Dea rSirs : 

### Subject : Exemptio

nPetitio nfo r 14CFR21.62 1 Reference : Simila rRecentl ySubmitte d Exemptio n - Trackin g Number : 80a6b7c 7 Chelto n Avionics , Inc
. db a Wulfsber g Electronic s Divisio n (hereafte rWulfsberg ) i n accordanc e wit h 14CFR11.8 1 hereb yrequest s a n exemptio n t o 14CFR21.62 1 Transferabilit yan d Duration , "ATS O authorizatio n o rlette ro fTS O desig n approva l issue d unde rthi s part i s no t transferabl e an d i s effectiv e unti l surrendered , withdrawn , o rotherwis e terminate d b yth e Administrator"
. Chelto n Avionics , Inc
. i s a Delawar e corporatio n an d i s doin g busines s a s Wulfsber g Electronic s Divisio n i n Prescott , Arizona
. Wulfsber g i s 100 % owne d b yCobha m pic
. Cobha m pi cals o own s Norther n Airborn e Technolog yLtd
. an d 99 % o fit s Intellectua l Properties
. Bot h Norther n Airborn e Technolog yLtd
. An d Chelto n Avionics , Inc
. operat e as a subdivisio n unde rth e Cobha m Avionic s an d Surveillanc e divisio n o f Cobha m pi c( a publicl yhel d compan yliste d i n th e Londo n Stoc k Exchange)
. Cobha m i s restructurin g th e entitie s owne d b yCobha m pic , whic h include s Wulfsber g Electronic s Divisio n an d Norther n Airborn e Technolog yLtd
. unde rChelto n Avionics , Inc
. db a Wulfsber g Electronic s Division
. Wulfsber g i s i n th e proces s o fconsolidatin g operation s i n Prescott , Arizon a t o provid e consisten t method s o fbusines s processing
. Norther n Airborn e Technolog yLtd
. wil l remai n a n entitiy , howeve rintellectua l propertie s an d asset s belon g t o Cobha m Pic
. Th e previousl yapprove d TSOA s wil l b e hel d b yWulfsber g wit h approval s bein g manage d byth e FA AL AAC O an d FA

APhoeni xMID O offices
. I t i s th e intentio n o f Wulfsber g t o continu e supportin g th e product s produce d byNorther n Airborn e Technolog yLtd
. wit h continue d ne wproduction , desig n support , repai rservicin g an d maintainin g responsibilit yfo ral l record s an d difficultie s o fpreviousl yproduce d products
. Wulfsber g desire s t o transfe rTS O approval s fro m Norther n Airborn e Technolog yLtd
. Cobha m Pi cowne d sit e t o allo wfo rth e continue d manufactur e o fth e TS O article s unde rth e existin g TS O approvals
. Th e TS O article s wil l b e manufacture d an d teste d t o th e origina l approve d specification s an d drawings
. FA A 8150-l B provide s th e followin g instruction s fo ra n applicant t o petitio n fo ra n exemptio n fo rth e transfer o fa TS O authorization
. 

### 8150.1 8 11
. a . (2 ) I n case s wher e a n applican t desire s approva l t o manufactur e a n articl e t o a n earlie r versio n o fa TS O (se e paragrap h 1 9 o fthi s order) , th e appropriat e mean s i s vi a a reques t fo ra n exemption , a s outline d i n 1 4 CFR Par t 11
.

Chelto n Avionics , Inc
. db a Wulfsber g Electronics Divisio n w.cobham.co m8150.1 B Pa r1 9 infer s tha t th e inten t i s t o permi t continue d productio n o folde rTS O articles
.

"I n eithe rcase , th e inten t i s t o permi t continue d production , i n mos t case s o folde rTS O article s use d o n existin g typ e certificate d aircraft. " I n a simila rsituation , th e FA Aexemptio n approva l #957 2 indicate d "th e rul e wa s no t intende d t o preven t on e compan yfro m buyin g another , o rfro m on e compan yassumin g majorit yownershi p o fanother. " Wulfsber g i s proposin g a chang e o fownershi p an d TS O approva l transfer s identifie d below , tha t i s believe d no t t o violat e th e inten t o f14CFR21.621
. Wulfsber g desire s t o transfe rTS O C50 can d C13 9 desig n an d productio n approval s fro m Norther n Airborn e Technolog yLtd
. ( a Cobha m pic
. owne d facilit yi n Kelowna , Canada ) t o Chelto n Avionics , Inc
. db a Wulfsber g Electronic s Divisio n i n Prescott , Arizona
. Eac h o fthes e TSO Awer e previousl yapprove d throug h th e NYAC

O t o TCC At o Norther n Airborn e Technolog yLtd
. Eac h o fthes e TS O Article s excep t fo rth e DACS a s note d i n th e tabl e below , ha s bee n approve d fo rre issuanc e wit h simultaneou s surrende ro fth e TSO Ab yNorther n Airborn e Technolog yLtd
. t o TCCA
. Wulfsber g has bee n manufacturin g thes e TSO' d article s throughou t 200 9 unde rth e approve d TSOA
. I t wa s no t unti l a recen t Decembe r200 9 teleco m betwee n th e LAACO , SACO , FA AH Q i n D

C wit h AIR-12 0 an d AIR-13 0 Representatives , Phoeni x(vjID O representative s an d bot h Seattl e an d Prescott compan y representative s tha t w e wer e tol d b yH Q tha t w e neede d t o submi t fo ra n exemption
. A t tha t tim e al l o f th e product s belo wexcep t fo rth e DACS Model s wer e bein g manufacture d i n Prescott unde rth e TSO A an d bein g shipped
. Thi s ha s continue d t o dat e an d workin g wit h th e LAACO , w e hop e t o resolv e thi s throug h th e approva l o fth e prio rsimila rexemptio n an d o fthi s exemptio n fo rth e product s liste d below
. Th e produc t lis t an d respectiv e existin g TS O follows : NATKelown a Mode l Descriptio n Applicabl e TSO(s ) Curren t LAAC O TSO AApproval s 25 0 25 1 24 0 80 2 80 6 80 7 3110-XX X AA34-3X X 24 5 24 6 24 7 27 0 N301A-XX X 43 7 63 1 Passenge rSpeal<e rAmplifie r Pagin g Amplifie r Pagin g Amplifie r Switc h Pane l controlle r Switc h Pane l controlle r Switc h Pane l controlle r Audi o Controlle rPane l Universa l Radi o Interfac e Speake rAmplifie r Isolatio n Amplifie r Audio Mixin g Amplifie r Universa l Interfac e Amplifie r Audi o controlle r Audi o Contro l Amplifie r Aura l Warnin g Generato r C50 c C50 c C50 c C50 c G50 c C50 c C50 c C50 c C50 c C50 c C50 c C50 c C50 c C50 c C50 c I n additio n w e wish t o transfe rth e TS O Desig n Approva l hel d byNA TLtd , Kelowna , CANAD At o Wulfsber g fo rth e followin g product : NA TKelown a Mode l Descriptio n Applicabl e TSO(s ] Curren t TS O Desig n Approval s hel d byNA TLtd. , Kelowna , CANADA) DACS (comprisin g ACP5(x-xxx) , AMU50-(xxx)
. RMOI-(xxx ) Digita l Audi o Communicatio n Syste m C I3 9
Th e Initia l (Manufacturin g fo rth e DACS Product s wi l FA APhoeni xMID O approve d Q ASystem
. b e i n th e Prescott , Arizon a facilit yunde rth e curren t
Chelto n Avionics , Inc
. db a Wulfsberg Electronics Divisio n w.cobham.comWulfsber g i s a curren t TSO Aholde rfo rth e followin g TSOs : 

### 1 . C41 c 2 . C66 c 3 . C11 3 4 . C34e , C35d , C36e , C40 c 5 . C146a , ClOb , C9c , C8d , C6d , C2 d 6 . C11 3 7 . C41c , C66b , C74c , C27c , C38c , C34c , C35d , C36c , C40 b 8
. C74c 9
. C37d , C38 d Wulfsber g has hel d TS O approval s fo rdesig n an d productio n fo r8 year s an d has shippe d ove r19,00 0 TS O an d PI^IAarticle s operate d byth e flyin g publi cwit h n o safet yviolations
. Man yo fth e article s are classifie d a s "essentia l equipment " fo raircraft
. Wulfsber g operate s unde ra Phoeni xFA AMID O approve d qualit ysyste m tha t woul d continu e t o b e use d an d improve d wit h FA AMID O approva l o fchange s an d operation
. Thi s wil l ensur e th e article s ar e buil t an d teste d t o equivalent aircraf t safet ylevel s a s provide d byth e previou s TS O holders
. Allowin g Wulfsber g t o procee d unde rth e requeste d exemptio n t o continu e t o mee t custome rneed s b y providin g TS O article s unde rthei rpreviousl yapprove d TSO s woul d resul t i n continue d flo wo fthes e TS O article s t o customers . Th e publi chas interes t I n th e custome rbas e bein g supporte d b ythes e TS O articles
. Th e custome rbas e consist s o fgovernmen t aircraf t i n th e militarytrainin g area , la w enforcemen t agencies , homelan d securit yefforts , activ e militaryunits , emergencyrespons e groups . We als o hav e a bas e o fcommute raircraf t manufacturers , busines s aircraf t manufacturers , genera l aviatio n manufacturers , modificatio n centers , an d othe rcivi l aviatio n customer s tha t w e support . I fWulfsber g i s require d t o pursu e a ne wTS O approva l fo rth e liste d TS O product s i t woul d als o requir e customer s t o updat e desig n approval s t o allo wth e article s t o b e installe d du e t o th e necessar ychang e i n part number
. Th e time/cos t require d t o develop , revie wan d proces s a ne wTS O approva l woul d interrup t th e flo wo fTS O article s t o customers . Suc h a delaywoul d b e unacceptabl e t o ou rcustomer s as the yd o no t have th e abilit yt o reschedul e thei rtim e critica l missions
. Misse d o rdelaye d mission s woul d resul t i n reduce d publi csafety
. Wulfsber g believe s goo d caus e exist s fo rno t publishin g a summaryo fth e petitio n i n th e Federa l Register , becaus e thi s woul d resul t i n a delayo fth e FA Aactin g o n thi s petitio n an d woul d b e detrimenta l t o Wulfsber g an d Wulfsber g customers . Sincerely , Ji m Buehrin g Certificatio n Manage r Chelto n Avionics , Inc
. db a Wulfsber g Electronic s Divisio n 640 0 Wilkinso n Drive , Prescot t Arizona , 8630 1 

### T : 92 8 708-152 7 j im . buehring@cobham . co m F ; 92 8 708-151 1 www.cobham . com/avionic s

Chelto n Avionics , Inc
. db a Wulfsber g Electronic

s Divisio n w.cobham.com