### [F ederal Register Volume 78 , Number 121 (Mo nday, June 24, 2013)1 [Rules and Regulations] [Pages 37701-37703) From the Federal Register Online via the Government Printing Office [www.gpo.gov] [FR Doc No: 20 13

- 14967]

DEPARTMENT OF TRANSPORTATION Federal Aviation Administration 14 CFR Part 39 (Docket No. 

### FAA-2013-0223; Directorate Identifier 2012-CE-049-AD; Amendment 39-17468; AD 2013-11-08] 

### RIN 2120-AA64 Airworthiness Directives; Pilatus Aircraft Ltd. Airplanes AGENCY: Federal Aviation Administration (FAA), Department of Transportation (DOT). ACTION: Final rule.

SUMMARY: We are superseding an existing airworthiness directive (AD) for Pilatus Aircraft Ltd. Models PC-6, PC

-6-H I, PC

- 6-H2 , PC-6/350, PC-6/350-H I, PC-6/350-H2 , PC-6/A, PC-6/A-H I , PC6/A-H2, PC

- 6/ B-H2, PC-6 /Bl-H2, PC-6 /B2-H2. PC-6 / B2-H4, PC

- 6/C

- H2, and PC-6/CI-H2 airplanes. This AD results from mandatory continuing airworthiness inf ormatio n (MCAI) issued by an aviation authority ofanother country to identify and correct an unsafe condition on an aviation product. The MCAI describes the unsafe condition as failure t o inspect and maintain stabilizer-trim attachment components and the flap actuator could result in loss of control. We are issuing this proposed AD to require actions to address the unsafe condition on these products. DATES: This AD is effective July 29,2013. The Director of the Federal Register approved the incorporation by reference of certain publications listed in the AD as of July 29, 2013. ADDRESSES: You may examine the AD docket on the Internet at http: // www.regulations.gov or in person at the Docket Management Facility, U.S. Department ofTransportation , Docket Operations. M-30, West Building Ground Floor, Room W 12-140 , 1200 New Jersey Avenue S E., Washington , DC 20590. For serv ice inf ormatio n identified in thi s AD , contact PILA TUS AIRCRAFT LTD., Customer Service Manager, CH-63 71 STANS , Switzerland ; telephone: +4 1 (0) 41 

### 619 65 01; fax: +41 (0) 41 619 65 76; Internet: http: // www .pilatus-aircraft.com /#32. You may review copies ofthe referenced serv ice inf ormation at the FAA, Small Airplane Directorate, 90 I Locust, Kansas City. Missouri 64 1 06. For information on the availab ility of this material at the FAA, call (816) 329-4148.

### FOR FURTHER INFORMATION CONTACT: Doug Rudolph, Aerospace Engineer, FAA, Small Airplane Directorate, 90 I Locust, Room 30 I, Kansas City, Missouri 641 06; telepho ne: (816) 3 29- 4059; fax: (816) 329-4090; email: doug.rudolph@faa.gov. 

### SUPPLEMENTARY INFORMATION: Discussion We issued a notice of proposed rulemaking (NPRM) to amend 14 CFR part 39 to include an AD that would apply to the specified products

. That NPRM was published in the Federal Register on March 7, 2013 (78 FR 14729), and proposed to supersede AD 2011-01-14 , Amendment 39-16571 76 FR 5467; February I, 20 II)

. That NPRM proposed to correct an unsafe condition for the specified products. The MCAI states that: The mandatory instructions and airworthiness limitations applicable to the Structure and Components of the PC-6 are specified in the Aircraft Maintenance Manual (AMM) under Chapter 4 or in the Airworthiness Limitations Document (ALS), depending on the aeroplane model. These documents include the maintenance instructions and/or airworthiness limitations develo ped by Pilatus Aircraft Ltd. and approved by EASA. Failure to comply with these instructions and limitations could potentially lead to an unsafe condition. To address this potentially unsafe condition EASA issued AD 20 I0

-0176 to require implementation of maintenance instructions and/or airworthiness limitations in accordance with Pilatus PC-6 ALS issue I, dated \4 May 2010 and Pilatus PC-6 AMM Chapter 4, issue 12, dated 14 May 20 I0. Since that AD was issued, Pi latus Aircraft Ltd published Pi latus PC-6 AMM (Number 01975) Chapter 4, issue 16 and PC-6 ALS (Number 02334) issue 3 to introduce a threshold for replacement of previously not listed Flap Actuator. For the reason described above, this AD retains the requirement of AD 20 I0-0176, which is superseded, and requi res the implementation of more restrictive maintenance requirements and/or airworthiness limitation as specified in issue 16 of Chapter 4 of AMM and issue 3 of ALS

. This AD also requires replacement ofany Flap Actuator whi c h, on the effective date ofthis AD, has accumulated or exceeded 7 years since new or since last overhaul. 

### Comments We gave the public the opportunity to participate in developing this AD. The following presents the comments received on the proposal and the FAA's response to each comment. 

### Use Latest Revision of the Airplane Maintenance Manual Pi latus Aircraft stated that the latest revision of the Aircraft Maintenance Manual (AMM) 01975 be quoted in the AD, which is Pilatus PC-6 B2

- H2 / B2-H4 Maintenance Manual, document No. 01975, Revision No. 17, dated December 31 , 2012. They stated this will prevent applications for an alternative method of compliance (AMOC) shortly after AD release and that the Airworth iness Limitations Section (ALS) section remained unchanged in this revision ofthe AMM. They stated the AMM update was released after the MCAI was submitted and the Aircraft Limitations document 02334 at Rev ision No.3, dated July 31 , 2012, is correct. 2
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### national government and the States , or on the distribution of power and responsibilities among the various levels ofgovernment. For the reasons discussed above, I certify this AD: (I) Is not a " s ignificant regulatory action" under Executive Order 

### 12866, (2) Is not a "significant rule" under the DOT Regulat o ry Po licies and Procedures (44 FR II 034, F

ebruary 26, 1979), (3 ) Will not affect intrastate aviation in Ala ska, and (4) Will not have a significant economic impact , positive or negative, on a substantial number of small entities under the criteria ofthe Regulatory Flexibility Act. 

### Examining the AD Docket You may examine the AD docket on the Internet at http: // www.regulations.gov ; or in person at the Docket Management Facility between 9 a.m. and 5 p.m. , Monday through Friday, except Federal holidays. The AD docket contains the NPRM, the regulatory evaluation, any comments received , and other information. The street address for the Do cket Office (telephone (800) 647-5527) is in the ADDRESS ES section. Comments will be available in the AD docket shortly after receipt. 

### List of Subjects in 14 CFR Part 39 Air transportation, Aircraft, Avia tion safety, Incorporation by reference, Safety. 

### Adoption of the Amendment Accordingly, under the authority delegated to me by the Administrator, the FAA amends 14 CFR part 39 as f ollows: 

### PART 39-AIRWORTHINESS DIRECTIVES I. The authority citation f or part 39 c ontinues to read as f o llo ws: Authority: 49 U .S

.C
. I06(g) , 40113, 44 70 I. 

### § 39. 13 [Amended] 2. The FAA amends§ 39.13 by remov ing Amendment 39-16571 (76 FR 5467, February I , 2011 ) and adding the f ollowing new AD:

4

I 0 ,.....,",,..._,, " ' .-... .._ .,. _. • • · - ·-- ·· ·-Manual. Revi s ion 16 and revision 17 of the Pi latus PC-6 Maintenance Manual both contain the Chapter 04 , Airworthiness Limitations , dated July 31 , 2012. (2) For all affected Models PC-6 other than the Mode ls PC-6/B2-H2 and PC-6 /B2-H4: Before further fl ight after July 29 , 2013 (the effective date ofthis AD), incorporate the maintenance requirements as specified in Pilatus PC-6 Airworthines s Limitations, Document No
. 02334, Revi s ion No.3 , da ted July 31,2012, into your FAA-accepted maintenance program. (3) For all Models PC-6 airplanes: 1fthe actuator has accumulated 3,500 hours TIS or more since new or las t overhauled o r 7 years or more since new or last o verhauled , wh i chever occurs first, replacement ofthe flap actuator (except part numbers 978.73. I4.10 I and 978.73.14.1 03 ) is required within 350 hours TIS after July 29, 2013 (the effective date of this AD) or 6 months after July 29. 2013 (the effective date of this AD), whichever occurs first. Actuators with less than 3,500 hours T1 S or 7 years s ince new or last overhauled are covered by the ALS requirement. 

### (g) Other FAA AD Provisions The fo llowing provisions also app ly to this AD: (1) A l ternative Methods of Compliance (AMOCs): The Manager, Standards Office, FAA, has the authority to approve AMOCs for this AD, if reque sted using the procedures found in 14 CFR 39.19. Send information to ATTN: Doug Rudolph, Aerospace Engineer, FAA , Small Airplane Directorat e , 90 I Locust, Room 30 I, Kansas City, Missouri 641 06; telephone: (816) 329-4059; fax: (816) 329-4090; email: doug.rudolph @ faa.gov. Before using any approved AMOC on any airplane to which the AMOC applies , notify your appropriate principal inspector (PI) in the FAA Flight Standards District Office (F SDO) , or la cking a PI , your local FSDO. (2) Airwo rthy Product: For any requirement in this AD to obtain corrective acti ons from a manufacturer or other source, use these actions if they are FAA-approved. Corrective actions are considered FAA-approved if they are appro ved by the State of Design Authority (or their delegated agent). Yo u are required to assure the product is airworthy before it is returned to service. 

### (h) Related Information Refer to MCAI EASA AD No.: 2 0 12-0268, dated December 19, 2012; and Pilatus PC-6 B2- H2/B2-H4 Airplane Maintenance Manual (AMM); Document No. 01975, revision 17; dated December 31 , 2012, for related information. For the Pi latus Aircraft Ltd. related inf ormation use the contact i nformation found in paragraph (i)(3) of this AD. 

### (i) Material Incorporated by 

### Reference (I) The Director ofthe Federal Register approved the incorporation by reference (IBR) of the service inf o rmation li sted in this paragraph under 5 U.S.C. 552(a) and I CFR part 51. (2) You must use this service information as applicable to do the actions required by thi s AD , unles s the AD specifies otherwise. (i) Chapter 04 , Airworthiness Limitations, dated July 31, 2012 , of the Pilatus PC-6 Maintenance Manual. ( ii) Pi latus PC-6 Airworthiness Limitations , Document No. 02334, Revision No. 3 , dated July 31 , 2012. (3) For Pilatus Aircraft Ltd. service information identi f ied in this AD , contact Pilatus Aircraft Ltd

. , Customer Service Ma nager, CH-6371 STANS, Switzerland; telephone: +4 1 (0) 41 619 65 0 I ; fax: +4 1 (0) 41 619 65 76; Internet: http : //www .pilatus-aircraft.com /#32. (4) You may view thi s service inf o rmation at f AA , Small Airplane Directorate, 9 01 Loc ust. Kansas City, Missouri 641 0 6. For information on the availability of this material at the fAA, call (816) 329-4148

. 

### 6

### (5) You may v iew th is service inf ormatio n that is incorporated by reference at the National Archives and Records Administration (NARA). For informatio n on the availability o f thi s mat e rial at NARA, call 202-741

- 6030, or go to: http:/ /www.archives.gov / federa l-reg ister /cfr/ibr-locations.html. Issued in Kansas City, Mi s souri , on May 2 2 , 2013. Earl Lawrence, Manager , Small Airplane Directorat e, A ircraft Certificati on Service.



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