Docket No: FAA-2015-0839 Directorate ID: 2015-CE-006 Disposition Comments

O ri g i nat i ng Office Tracking No .:

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## ~FRAN 0 SNPRM 0 These comments are in respon se to an SNPRM



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### Has the referenced service inf ormation been revised since the NPRM was issued? 

### If yes , list latest revision and attach a copy. Note that changes b eyo nd th e scope ofthe previously published N PRMwill require a n ew notice . Co ntact/he Directorat efoca l point for guidance. 

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. Instructions: Summarize all comments by issue (not by commenter) and provide your recommended resolution of each issue. All comments relating to the same is s ue should be discussed together. Do not list all of the issues from one commenter togeth er. If changes to the AD are required based on the comments received , explain why and describe in detail what change(s) you recommend. Reference FAA-IR-M-8040.1 C Chapter 9. ISSUE 1: Select one of the following: compliance time 

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other, explain: Commenter(s): William West What change to the AD action is r equested? Requests allowance in compliance time a " I 0% exte ns i on of time to wo rk the actions in with already scheduled maintenance ' '. Why is the change requested or how is it just ifi ed? This flexibility , as stated above , was given in AD 2000-01-16 tha t involves the exhaust sys tems on these same airplanes. An extra 20 hours of operation before compliance is not expected to cause additional risk. Do we agree? No If YES, we agree because Jnsertju "lilicntinn Make the following changes to t he AD: I**i~t** 

### , Illy changes to the .t \D If PARTIALLY AGREE , we agree with Insert ll...,l because 

### IIJ"crtju"ti1ic.lllllll We di sagree with Insert text because lnscnju"tilicatinn Make the following changes to the AD: I is! <111\ changes**t~) th~.:**  :\D I f NO , we don ' t agree because AD 2015-07-03 was an immediately adopted rul e (JAR). Thus , it was published prior to the Comment Peri o d. Such a n ex ten sio n can be r eq uested with a n alternate method of compliance (AMOC), as discuss e d in the AD. A supersedure AD wou l d not be con s idered as a resu l t of this comment.
ISSUE 2: Select one of thefollowing: cos ts 

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other , exp lain: and in spec tion s are excessive Commenter(s): C ape Air I Na nt ucket A irl ines What change to the AD action is requested ? Recurrent eddy c u rrent of forward engine beam area are unneces sa r y based on actual experience. They a r e recommending lighted borescope and X-ra y 

### Page 1 of3in s pect i ons , b y appropriately qualified inspectors , at r epeat ins pections of 500 fli ght hours for airplane s with 30 , 000 flight ho ur s o r more; 750 , for 25 , 000 t o 29 , 999 ; I 000 , for 20 , 000 to 24 , 999 ; 2500 for 15 , 000 to 19 , 999 until t he eng in e mount beam is replaced. In a s u bseq uent co mme nt lette r , they pr opose to address the excessive l y frequent ins pect i o ns , a nd r eques t an exte ns i on to t he Com m e nt P er i od unti l Jul y I 0. This w ill allow them time to comp l ete t hei r fatigue and damage tolerance analysis. They have cont r ac t ed a D es i gnated Engineering R ep r ese ntat ive (DER) fi rm wit h exper i e nc e in Cessna 402C/4 1 4A str u cture to do t he ana l ysis. They have co mmitted to providing aircraft , fina n c i

al , a nd ot her r e quire d r eso urces to val idate thi s analysis with direct comparison to actua l fatigue s tresses. T hey w ill s hare this i nfor m ati o n wit h Cessna a nd t he Wichita Aircraft Certifica ti on Office (ACO) to be u se d t o r evise Cessna MEL

- 54 -01 and AD 2 01 5- 07-0 3

. Why i s th e change requested o r how is it justified? They have found no defects using eddy cur r ent. The r epet i tive com pliance tim es do not positively co ntr ib ute to ove rall aircraft in s pect i o n p r ogram a nd their opera ti onal safety profi l e . Th ese i ns pecti on inte rvals may be a hind ra nce to safety. The 200 hour r e peat inspections w ill cost th em $593,670.00 an nua ll y p lus ot her operat iona l cos ts incl udin g flight c r ew , aircraft r e posi ti on , and aircraft o ut of se rv ic e time. I n addition , t hey es tima te $8 , 500 .00 in parts per beam a nd 55 ho u rs per beam in l abor. At $85. 0 0 pe r l abo r h ou r , each e ng in e m ou nt beam r e pl ace cost would be $ 13 , 175.00 or $ 52 , 7 00.00 per airplane. F o r t he m, t h is rep r esents $4 , 374 , I 00.00 for their fleet of ai rp lanes

. T hey s tat e d that Cessna says t ha t t hey have no repair ot her than beam r ep lac eme nt , a nd Cess na does not plan t o d eve l op a r epa ir . Because of Cessna inacti on in d evelo pin g r epair options that t he true cost to repl ace t he e ng in e m o unt s beams needs to be d isc u ssed t o u n d erstan d th e actual financial i mpa ct. Do we agree? No If YES, we agree because Insert**ju~tilicali~ll1** Make th e fo ll owing c ha nges to th e AD: Li·•l am changes to the A I) If PART I ALLY AGREE , we agree w ith Insert tc:-.l because Insert**juslilic<~liPn** We di sag r ee wi t h Insert lc'\l because Insert justitic·ltll)ll Make t he following c han ges to the AD: f j,t ;HI) chan**gc~** to th

... · 1\ L) If NO, we do n ' t agree beca us e AD 2015-07-03 was an imme diat e l y ado pted rule (JAR). Th u s , it was pu b lis hed prior to th e Co mmen t P e ri o d

. H owever, fwther s tud y, suc h as their pro posed ana l ys i s initiative, m ay r es u lt i n fu tu re action. T h e Comme nt P e ri o d ca nno t be c ha nged t o July I 0 si nc e the 30 day Commen t P e rio d is a r eq uireme nt per FAA Order FAA-IR-M-8040.1 C. Ho wever , we will pl ac e a n

y l ate comme nts i n F ederal Docket Management System (FDMS). We wi ll cons i der th ei r late com m e nts in the event that a s uper s e d ur e AD is considered.

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