Comments

We gave the public the opportunity to participate in developing this AD. We considered the comments received.

Comment Issue No. 1: Unable To Comply With AD

Scott R. Lania of Alpha Flying Inc./Atlas Aircraft Center, Inc. and Tim Kitzmann state that incorporating limitations and making pen and ink changes to the airworthiness limitations section of the FAA approved maintenance manual are impractical and impossible.

The commenters state that each affected airplane does not have its own maintenance manual, which makes compliance with paragraph (f) of the NPRM implausible. They state that most maintenance manuals for Pilatus PC12 airplanes are now on compact disk (CD), which makes the pen and ink changes required in paragraph (f)(2) of the NPRM impossible.

The commenters believe it would be easier to state the part numbers of the affected pitch trim actuators and their new TBO interval into the AD to address the unsafe condition.

We partially agree with the commenters. We agree that making the pen and ink changes to the CD version of the FAAapproved maintenance manual would be impossible. However, we do not agree that incorporating just the part numbers of the affected pitch trim actuators and their new TBO interval into the AD addresses the unsafe condition. That approach could cause confusion with the latest version of the airworthiness limitations section of the FAAapproved maintenance manual and would not follow the State of Design Authority's actions.

To address this issue, we will allow using the CD version of the FAAapproved maintenance manual that incorporates the November 20, 2007, version of chapter 4 and the corresponding version of chapter 5 as an option for complying with the AD.

In accordance with 14 CFR 21.50 and 23.1529, the holder of a design approval for which application was made after January 28, 1981, is required to include an Airworthiness Limitations section in their FAA approved maintenance manual or maintenance program (Instructions for Continued Airworthiness). In this case, the manufacturer issued chapter 4 to Pilatus PC12 AMM 12A/AMP04, which is the Airworthiness Limitations section, and it must be incorporated into the airplane maintenance manual or maintenance program. This AD incorporates the November 20, 2007, version of these limitations.

The only way for us to mandate a version of the airworthiness limitations section, other than what was in place at delivery of the airplane, is through rulemaking, e.g., AD.

We will change the final rule AD action to incorporate the changes mentioned above.

Comment Issue No. 2: Change Compliance Time for TBO

Scott R. Lania of Alpha Flying Inc./Atlas Aircraft Center, Inc. believes that the calendar time for the TBO interval is too early for lowtime users. He suggests 8 to 10 years as a more realistic time for the 400 to 500hourayear users. He believes this would be more in line with the hightime users.

We do not agree. We have no data that allows us to deviate from the compliance time decision of both the type certificate (TC) holder and the State of Design Authority. The TC holder did not provide a conversion for the lowtime users; therefore, we are relying on the compliance time decision of the TC holder and State of Design Authority. Owners/operators may request an alternative method of compliance (AMOC) following the procedures in 14 CFR 39.19, and the AD. We will coordinate all requests with the TC holder and State of Design Authority.

We are not changing the final rule AD action based on this comment. Comment Issue No. 3: Request for Test Result Data

Dan P. Johnson states that the reduction of the hourly limit for the TBO may be acceptable provided there is evidence supporting it. The proposed AD states: ``based on fullscale fatigue test, the life limit has been extended, but the TBO reduced.''

The commenter requests to see the actual test results that prove a 5year calendar limit is warranted.

The commenter notes that the current chapter 4 component entry for this actuator has no calendar limitation. These actuators are overhauled in the United States by Derco Repair Services, Inc. in Milwaukee, Wisconsin. The commenter states that he contacted this repair station last year for a quote to overhaul one of these and was quoted a price of around $4,500. The commenter states that he was also told that, due to a proprietary agreement with Pilatus, they would not accept direct requests for overhaul and only Pilatus could provide service. The commenter states that this is a common practice of Pilatus to control U.S. parts distribution.

The commenter states that he understands the FAA does not get involved with costs incurred by operators. He also states that he understands the purpose of an AD is to detect and correct unsafe conditions and prevent them from happening in the future. The commenter believes that the FAA is assisting the TC holder in the ``gouging of American operators by agreeing to an unsubstantiated calendar limit.''

The commenter believes that the hourly TBO reduction is sufficient for 14 CFR part 91 operators.

We issued the NPRM based on fullscale fatigue tests conducted by the TC holder. The actual data is held by Pilatus, the European Aviation Safety Agency (EASA), and the Federal Office of Civil Aviation (FOCA). We have no data to show that the State of Design Authority's determination of the life limits specified in the NPRM is not valid.

We evaluated the State of Design Authority's information and determined that AD action was necessary in the United States to address an unsafe condition that is likely to exist or develop on airplanes of the same type design that are type certificated for operation in the United States. The life limit of the component is being added to the Airworthiness Limitations section along with the TBO interval in order to
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maintain the safe operation of this component.

We are not changing the final rule AD action based on this comment. Comment Issue No. 4: AD Unnecessary

Tim Kitzmann questions why the AD is necessary if these new limitations are FAAapproved. The commenter points out that 14 CFR 91.403(c) requires compliance with airworthiness limitations issued by the TC holder.

The commenter believes that the AD is unnecessary since the new limitations are part of chapter 4.

We do not agree with the commenter. While 14 CFR 91.403(c) requires compliance with FAAapproved limitations issued by the TC holder, the FAA's regulations do not require future incorporations of limitation section revisions, unless additional rulemaking action is taken, e.g., AD action. By taking AD action, we can mandate change to the airworthiness limitations section of an FAAapproved maintenance program for airplanes operating in both 14 CFR part 91 and part 135 operations. If these new limitations are not mandated, the pitch trim actuator and the pitch trim actuator components could fail.

We are not changing the final rule AD action based on these comments.

Comment Issue No. 5: Update Reference to the AMM

Pilatus Aircraft Ltd. states that the reference to Pilatus PC12 AMM, Chapter 4 is not correct. Due to the implementation of a new software publication system, Pilatus requests for the AMM reference to be changed to Report No. 02049, issue 1, revision 0, dated November 20, 2007.

We partially agree with the commenter. In order to avoid confusion, we will incorporate the date of the new document. Based on the documents we have, we cannot change the way Pilatus PC12 AMM, Chapter 4 is referenced in this AD. However, to accommodate Pilatus' new software publication system, we will add a parenthetical to the Pilatus PC12 AMM, Chapter 4 reference to include Report No. 02049, issue 1, revision 0.

We will change the final rule AD action based on this comment. Conclusion

We reviewed the available data, including the comments received, and determined that air safety and the public interest require adopting the AD with the changes described previously. We determined that these changes will not increase the economic burden on any operator or increase the scope of the AD.
Differences Between This AD and the MCAI or Service Information

We have reviewed the MCAI and related service information and, in general, agree with their substance. But we might have found it necessary to use different words from those in the MCAI to ensure the AD is clear for U.S. operators and is enforceable. In making these changes, we do not intend to differ substantively from the information provided in the MCAI and related service information.

We might also have required different actions in this AD from those in the MCAI in order to follow FAA policies. Any such differences are highlighted in a NOTE within the AD.

Costs of Compliance

We estimate that this AD will affect about 500 products of U.S. registry. We also estimate that it will take about .5 workhour per product to comply with the basic requirements of this AD. The average labor rate is $80 per workhour.

Based on these figures, we estimate the cost of this AD on U.S. operators to be $20,000, or $40 per product.

In addition, we estimate that any necessary followon actions (the replacements required by the limitations changes) will take about 3.5 workhours and require parts costing $11,960, for a cost of $12,240 per product.

Authority for This Rulemaking

Title 49 of the United States Code specifies the FAA's authority to issue rules on aviation safety. Subtitle I, section 106, describes the authority of the FAA Administrator. ``Subtitle VII: Aviation Programs,'' describes in more detail the scope of the Agency's authority.

We are issuing this rulemaking under the authority described in ``Subtitle VII, Part A, Subpart III, Section 44701: General requirements.'' Under that section, Congress charges the FAA with promoting safe flight of civil aircraft in air commerce by prescribing regulations for practices, methods, and procedures the Administrator finds necessary for safety in air commerce. This regulation is within the scope of that authority because it addresses an unsafe condition that is likely to exist or develop on products identified in this rulemaking action.

Regulatory Findings

We determined that this AD will not have federalism implications under Executive Order 13132. This AD will not have a substantial direct effect on the States, on the relationship between the national government and the States, or on the distribution of power and responsibilities among the various levels of government.

For the reasons discussed above, I certify this AD: (1) Is not a ``significant regulatory action'' under Executive Order 12866;
(2) Is not a ``significant rule'' under DOT Regulatory Policies and Procedures (44 FR 11034, February 26, 1979); and
(3) Will not have a significant economic impact, positive or negative, on a substantial number of small entities under the criteria of the Regulatory Flexibility Act.

We prepared a regulatory evaluation of the estimated costs to comply with this AD and placed it in the AD Docket.

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 Docket Office (telephone (800) 6475527) is in the ADDRESSES section. Comments will be available in the AD docket shortly after receipt.

List of Subjects in 14 CFR Part 39

Air transportation, Aircraft, Aviation safety, Safety. Adoption of the Amendment
Accordingly, under the authority delegated to me by the Administrator, the FAA amends 14 CFR part 39 as follows:
PART 39AIRWORTHINESS DIRECTIVES
1. The authority citation for part 39 continues to read as follows:

Authority: 49 U.S.C. 106(g), 40113, 44701.
Sec. 39.13 [Amended]
2. The FAA amends Sec. 39.13 by adding the following new AD: 20080711 Pilatus Aircraft Ltd.: Amendment 3915452; Docket No. FAA20080070; Directorate Identifier 2007CE098AD.
Effective Date
(a) This airworthiness directive (AD) becomes effective May 9, 2008.
Affected ADs
(b) None.
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Applicability
(c) This AD applies to Models PC12, PC12/45, and PC12/47 airplanes, all serial numbers, certificated in any category. Subject
(d) Air Transport Association of America (ATA) Code 27: Flight Controls.
Reason
(e) This AD results from mandatory continuing airworthiness information (MCAI) originated by an aviation authority of another country to identify and correct an unsafe condition on an aviation product. We are issuing this AD to mandate new life limits for the pitch trim actuator and pitch trim actuator attachment parts. If these new limitations are not mandated, the pitch trim actuator and the pitch trim actuator components could fail. This failure could lead to an unsafe flying configuration.

Actions and Compliance

Note 1: Pilatus has implemented a new software publication system. During the implementation of this new system, the airplane maintenance manual revision number was reset to 0. For the purposes of this AD, the date of issue takes prescedence over the revision level.
(f) Unless already done, do the following within the next 30 days after May 9, 2008 (the effective date of this AD).
(1) Insert unclassified document 12A/AMP04, Structural, Component and MiscellaneousAirworthiness Limitations, 12A0400 0000A000AA, dated October 26, 2007 (Pilatus PC12 Airplane
Maintenance Manual, Chapter 4, Report No. 02049, Issue 1, Revision 0, dated November 20, 2007), into the airworthiness limitations section of the FAAapproved maintenance program (e.g., maintenance manual) or use the CD version that incorporates the November 20, 2007, version of chapter 4 and the corresponding version of chapter 5. You may use any future amendment to this Airworthiness
Limitations section provided it does not change the inspection intervals, requirements, or the life limits for the pitch trim actuator and pitch trim actuator attachment parts of the document referenced above. The owner/operator holding at least a private pilot certificate as authorized by 14 CFR 43.7 may do this action. Make an entry in the aircraft records showing compliance with this portion of the AD following 14 CFR 43.9.
(2) In order to avoid confusion with the new pitch trim actuator limitations now contained in chapter 4 (previously contained in chapter 5), make pen and ink changes in chapter 5 and line through references to limitations for the pitch trim actuator. You do not have to make these pen and ink changes if you are using the CD version that incorporates the November 20, 2007, version of chapter 4 and the corresponding version of chapter 5.

FAA AD Differences

Note 2: This AD differs from the MCAI and/or service information as follows: No differences.
Other FAA AD Provisions
(g) The following provisions also apply to this AD:
(1) Alternative Methods of Compliance (AMOCs): The Manager, Standards Office, FAA, has the authority to approve AMOCs for this AD, if requested using the procedures found in 14 CFR 39.19. Send information to ATTN: Doug Rudolph, Aerospace Engineer, FAA, Small Airplane Directorate, 901 Locust, Room 301, Kansas City, Missouri 64106; telephone: (816) 3294059; fax: (816) 3294090. 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 (FSDO), or lacking a PI, your local FSDO. (2) Airworthy Product: For any requirement in this AD to obtain corrective actions from a manufacturer or other source, use these actions if they are FAAapproved. Corrective actions are considered FAAapproved if they are approved by the State of Design Authority (or their delegated agent). You are required to assure the product is airworthy before it is returned to service.
(3) Reporting Requirements: For any reporting requirement in this AD, under the provisions of the Paperwork Reduction Act (44 U.S.C. 3501 et seq.), the Office of Management and Budget (OMB) has approved the information collection requirements and has assigned OMB Control Number 21200056.

Issued in Kansas City, Missouri, on March 27, 2008. John Colomy,
Acting Manager, Small Airplane Directorate, Aircraft Certification Service.
[FR Doc. E86958 Filed 4308; 8:45 am]
BILLING CODE 491013P

FOR FURTHER INFORMATION CONTACT Doug Rudolph, Aerospace Engineer, FAA, Small Airplane Directorate, 901 Locust, Room 301, Kansas City, Missouri 64106; telephone: (816) 3294059; fax: (816) 3294090.
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