Airworthiness Directives; Pilatus Aircraft Ltd. Model PC-6 Series Airplanes, 44145-44147 [E8-17331]

Download as PDF Federal Register / Vol. 73, No. 147 / Wednesday, July 30, 2008 / Rules and Regulations 44145 Actions Compliance Procedures (3) Replace or modify (upload software) the stall warning AOA transmitters by doing one of the following: (i) Upload new software Kit No. 123–3436 (Field Software Upload SLZ8060–3,–4) to the AOA transmitters; or (ii) Replace any part number (P/N) SLZ8060–3 and/or P/N SLZ8060–4 AOA transmitters with new P/N SLZ8060–5 AOA transmitters. (4) Remove Raytheon Aircraft Company Temporary Change to the FAA Approved Airplane Flight Manual P/N 390–590001–0003CTC7, issued: March 15, 2007, from the AFM. (5) Do not install any P/N SLZ8060–3 or P/N SLZ8060–4 AOA transmitter that does not have the new upgraded software required by paragraph (e)(3)(i) of this AD. Within 250 hours TIS after September 3, 2008 (the effective date of this AD) or within 12 months after September 3, 2008 (the effective date of this AD), whichever occurs first. Completion of either paragraph (e)(3)(i) or (e)(3)(ii) of this AD terminates the required repetitive post-flight check of this AD. Follow Hawker Beechcraft Mandatory Service Bulletin No. SB 27–3787, issued: May 2007. Before further flight after doing the actions required by paragraph (e)(3)(i) or paragraph (e)(3)(ii) of this AD. Follow Hawker Beechcraft Mandatory Service Bulletin No. SB 27–3787, issued: May 2007. As of September 3, 2008 (the effective date of this AD). Not Applicable. DEPARTMENT OF TRANSPORTATION Material Incorporated by Reference (g) You must use Raytheon Aircraft Company Temporary Change to the FAA Approved Airplane Flight Manual P/N 390– 590001–0003CTC7, issued: March 15, 2007, and Hawker Beechcraft Mandatory Service Bulletin No. SB 27–3787, issued: May 2007, to do the actions required by this AD, unless the AD specifies otherwise. (1) The Director of the Federal Register approved the incorporation by reference of this service information under 5 U.S.C. 552(a) and 1 CFR part 51. (2) For service information identified in this AD, contact Hawker Beechcraft Corporation, 9709 East Central, Wichita, Kansas 67291; telephone: (800) 429–5372 or (316) 676–3140. (3) You may review copies at the FAA, Central Region, Office of the Regional Counsel, 901 Locust, Kansas City, Missouri 64106; or at the National Archives and Records Administration (NARA). For information on the availability of this material at NARA, call 202–741–6030, or go to: http://www.archives.gov/federal_register/ code_of_federal_regulations/ ibr_locations.html. rwilkins on PROD1PC63 with RULES Alternative Methods of Compliance (AMOCs) (f) The Manager, Wichita Aircraft Certification Office (ACO), 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: Philip Petty, Aerospace Engineer, Wichita ACO, 1801 Airport Road, Room 100, Wichita, Kansas 67209; telephone: (316) 946–4139; fax: (316) 946–4107. 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. AGENCY: Issued in Kansas City, Missouri, on July 23, 2008. John Colomy, Acting Manager, Small Airplane Directorate, Aircraft Certification Service. [FR Doc. E8–17329 Filed 7–29–08; 8:45 am] BILLING CODE 4910–13–P VerDate Aug<31>2005 16:51 Jul 29, 2008 Jkt 214001 Federal Aviation Administration 14 CFR Part 39 [Docket No. FAA–2008–0822; Directorate Identifier 2008–CE–045–AD; Amendment 39–15621; AD 2008–16–03] RIN 2120–AA64 Airworthiness Directives; Pilatus Aircraft Ltd. Model PC–6 Series Airplanes Federal Aviation Administration (FAA), DOT. ACTION: Final rule; request for comments. SUMMARY: We are adopting a new airworthiness directive (AD) for the products listed above. This AD results from mandatory continuing airworthiness information (MCAI) issued by the aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI describes the unsafe condition as: This Airworthiness Directive (AD) is prompted due to the discovery of cracked or broken leaf springs P/N 6232.0175.01 installed in the overhead flap-operating mechanism of some PC–6 aircraft. A broken leaf spring could lead to an uncommanded flap retraction which could lead to hazardous situations and subsequent loss of control of the aircraft. This AD requires actions that are intended to address the unsafe condition described in the MCAI. DATES: This AD becomes effective August 11, 2008. On August 11, 2008, the Director of the Federal Register approved the incorporation by reference of certain publications listed in this AD. PO 00000 Frm 00009 Fmt 4700 Sfmt 4700 We must receive comments on this AD by August 29, 2008. ADDRESSES: You may send comments by any of the following methods: • Federal eRulemaking Portal: Go to http://www.regulations.gov. Follow the instructions for submitting comments. • Fax: (202) 493–2251. • Mail: U.S. Department of Transportation, Docket Operations, M– 30, West Building Ground Floor, Room W12–140, 1200 New Jersey Avenue, SE., Washington, DC 20590. • Hand Delivery: U.S. Department of Transportation, Docket Operations, M– 30, West Building Ground Floor, Room W12–140, 1200 New Jersey Avenue, SE., Washington, DC 20590, between 9 a.m. and 5 p.m., Monday through Friday, except Federal holidays. 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 this AD, the regulatory evaluation, any comments received, and other information. The street address for the Docket Office (telephone (800) 647– 5527) is in the ADDRESSES section. Comments will be available in the AD docket shortly after receipt. FOR FURTHER INFORMATION CONTACT: Doug Rudolph, Aerospace Engineer, Small Airplane Directorate, 901 Locust, Room 301, Kansas City, Missouri 64106; telephone: (816) 329–4059; fax: (816) 329–4090. SUPPLEMENTARY INFORMATION: Discussion The Federal Office of Civil Aviation (FOCA), which is the aviation authority for Switzerland, has issued FOCA EMERGENCY AD HB–2008–242 E:\FR\FM\30JYR1.SGM 30JYR1 44146 Federal Register / Vol. 73, No. 147 / Wednesday, July 30, 2008 / Rules and Regulations (referred to after this as ‘‘the MCAI’’), to correct an unsafe condition for the specified products. The MCAI states: This Airworthiness Directive (AD) is prompted due to the discovery of cracked or broken leaf springs P/N 6232.0175.01 installed in the overhead flap-operating mechanism of some PC–6 aircraft. A broken leaf spring could lead to an uncommanded flap retraction which could lead to hazardous situations and subsequent loss of control of the aircraft. This AD is published by Federal Office of Civil Aviation (FOCA) Switzerland, as State of production and because it is possible that the leaf springs were not manufactured properly. In order to correct and control the situation, this AD requires the initial and repetitive inspections of the leaf springs in the flap operating mechanism and the replacement of broken parts. You may obtain further information by examining the MCAI in the AD docket. Relevant Service Information Pilatus Aircraft Limited has issued Pilatus PC–6 Service Bulletin No. 27– 002 and Pilatus PC–6 Service Bulletin 27–003, both dated July 2, 2008. The actions described in this service information are intended to correct the unsafe condition identified in the MCAI. rwilkins on PROD1PC63 with RULES FAA’s Determination and Requirements of the AD This product has been approved by the aviation authority of another country, and is approved for operation in the United States. Pursuant to our bilateral agreement with this State of Design Authority, they have notified us of the unsafe condition described in the MCAI and service information referenced above. We are issuing this AD because we evaluated all information provided by the State of Design Authority and determined the unsafe condition exists and is likely to exist or develop on other products of the same type design. 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. The MCAI allows for replacement parts with like parts that are prone to cracking. The reason for the 25-hour repetitive inspection is because the VerDate Aug<31>2005 16:51 Jul 29, 2008 Jkt 214001 cracks are occurring quickly. We believe that allowing replacement with the same part numbers that are cracking when improved design part numbers exist allows the unsafe condition to continue. Therefore we are requiring replacement with the new improved part numbers if cracks are found. 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. FAA’s Determination of the Effective Date An unsafe condition exists that requires the immediate adoption of this AD. The FAA has found that the risk to the flying public justifies waiving notice and comment prior to adoption of this rule because a broken leaf spring could lead to an uncommanded flap retraction and lead to loss of control during final approach. Therefore, we determined that notice and opportunity for public comment before issuing this AD are impracticable and that good cause exists for making this amendment effective in fewer than 30 days. 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 that 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. Comments Invited This AD is a final rule that involves requirements affecting flight safety, and we did not precede it by notice and opportunity for public comment. We invite you to send any written relevant data, views, or arguments about this AD. Send your comments to an address listed under the ADDRESSES section. Include ‘‘Docket No. FAA–2008–0822; Directorate Identifier 2008–CE–045– AD’’ at the beginning of your comments. We specifically invite comments on the overall regulatory, economic, environmental, and energy aspects of this AD. We will consider all comments received by the closing date and may amend this AD because of those comments. We will post all comments we receive, without change, to http:// www.regulations.gov, including any personal information you provide. We will also post a report summarizing each substantive verbal contact we receive about this AD. 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 PO 00000 Frm 00010 Fmt 4700 Sfmt 4700 List of Subjects in 14 CFR Part 39 Air transportation, Aircraft, Aviation 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 follows: I PART 39—AIRWORTHINESS DIRECTIVES 1. The authority citation for part 39 continues to read as follows: I Authority: 49 U.S.C. 106(g), 40113, 44701. § 39.13 [Amended] 2. The FAA amends § 39.13 by adding the following new AD: I 2008–16–03 Pilatus Aircraft Limited: Amendment 39–15621; Docket No. FAA–2008–0822; Directorate Identifier 2008–CE–045–AD. Effective Date (a) This airworthiness directive (AD) becomes effective August 11, 2008. Affected ADs (b) None. Applicability (c) This AD applies to Models PC–6, PC– 6–H1, PC–6–H2, PC–6/350, PC–6/350–H1, E:\FR\FM\30JYR1.SGM 30JYR1 Federal Register / Vol. 73, No. 147 / Wednesday, July 30, 2008 / Rules and Regulations PC–6/350–H2, PC–6/A, PC–6/A–H1, PC–6/ A–H2, PC–6/B–H2, PC–6/B1–H2, PC–6/B2– H2, PC–6/B2–H4, PC–6/C–H2, and PC–6/C1– H2 airplanes, manufacturer serial numbers (MSN) MSN 101 through MSN 999 and MSN 2001 through MSN 2092, certificated in any category, with mechanically operated flaps and leaf springs, part number (P/N) 6232.0175.01 installed in the overhead flapoperating mechanism. Note: These airplanes may also be identified as Fairchild Republic Company PC–6 airplanes, Fairchild Heli Porter PC–6 airplanes, or Fairchild-Hiller Corporation PC–6 airplanes. Subject (d) Air Transport Association of America (ATA) Code 27: Flight Controls. rwilkins on PROD1PC63 with RULES Reason (e) The mandatory continuing airworthiness information (MCAI) states: This Airworthiness Directive (AD) is prompted due to the discovery of cracked or broken leaf springs P/N 6232.0175.01 installed in the overhead flap-operating mechanism of some PC–6 aircraft. A broken leaf spring could lead to an uncommanded flap retraction which could lead to hazardous situations and subsequent loss of control of the aircraft. This AD is published by Federal Office of Civil Aviation (FOCA) Switzerland, as State of production and because it is possible that the leaf springs were not manufactured properly. In order to correct and control the situation, this AD requires the initial and repetitive inspections of the leaf springs in the flap operating mechanism and the replacement of broken parts. Actions and Compliance (f) Unless already done, do the following actions: (1) Before the next flight after the effective date of this AD, do a visual inspection of the leaf springs installed in the overhead flapoperating mechanism for cracks following Pilatus Aircraft Ltd. Pilatus PC–6 Service Bulletin No. 27–002, dated July 2, 2008. (2) If any cracks are found in the leaf springs installed in the overhead flapoperating mechanism, before further flight, remove the three leaf springs, P/N 6232.0175.01, installed in the overhead flapoperating mechanism, and replace with three new leaf springs, P/N 116.45.06.040, in the overhead flap-operating mechanism following Pilatus Aircraft Ltd. Pilatus PC–6 Service Bulletin No. 27–003, dated July 2, 2008. (3) Repetitively inspect thereafter at intervals not to exceed 25 hours time-inservice following Pilatus Aircraft Ltd. Pilatus PC–6 Service Bulletin No. 27–002, dated July 2, 2008, until the modification required in paragraph (f)(2) of this AD is done. If any cracks are found in the leaf springs installed in the overhead flap-operating mechanism, before further flight, remove the three leaf springs, P/N 6232.0175.01, and replace with three new leaf springs, P/N 116.45.06.040, following Pilatus Aircraft Ltd. Pilatus PC–6 Service Bulletin No. 27–003, dated July 2, 2008. VerDate Aug<31>2005 16:51 Jul 29, 2008 Jkt 214001 (4) As of the effective date of this AD, do not install any P/N 6232.0175.01 leaf spring in the overhead flap-operating mechanism. 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) 329–4059; fax: (816) 329– 4090. 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 FAA-approved. 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 2120–0056. Special Flight Permit (h) If cracks are detected during the inspection required in (f)(1) or (f)(3) of this AD, no further flight is permitted until the modification required in paragraph (f)(2) or (f)(3) of this AD is done. Related Information (i) Refer to MCAI FOCA EMERGENCY AD HB–2008–242, dated July 4, 2008, and Pilatus Aircraft Ltd. Pilatus PC–6 Service Bulletin No. 27–002 and Pilatus Aircraft Ltd. Pilatus PC–6 Service Bulletin 27–003, both dated July 2, 2008, for related information. Material Incorporated by Reference (j) You must use Pilatus Aircraft Ltd. Pilatus PC–6 Service Bulletin No. 27–002 and Pilatus Aircraft Ltd. Pilatus PC–6 Service Bulletin 27–003, both dated July 2, 2008 to do the actions required by this AD, unless the AD specifies otherwise. (1) The Director of the Federal Register approved the incorporation by reference of this service information under 5 U.S.C. 552(a) and 1 CFR part 51. (2) For service information identified in this AD, contact Pilatus Aircraft Ltd., Customer Liaison Manager, CH 6371 STANS, Switzerland; telephone: + 41 (0)41 619 6580; fax: + 41 (0)41 619 6576; e-mail: fodermatt@pilatus aircaft.com. (3) You may review copies at the FAA, Central Region, Office of the Regional Counsel, 901 Locust, Room 506, Kansas City, Missouri 64106; or at the National Archives and Records Administration (NARA). For PO 00000 Frm 00011 Fmt 4700 Sfmt 4700 44147 information on the availability of this material at NARA, call 202–741–6030, or go to: http://www.archives.gov/federal-register/ cfr/ibr-locations.html. Issued in Kansas City, Missouri, on July 23, 2008. John Colomy, Acting Manager, Small Airplane Directorate, Aircraft Certification Service. [FR Doc. E8–17331 Filed 7–29–08; 8:45 am] BILLING CODE 4910–13–P DEPARTMENT OF TRANSPORTATION Federal Aviation Administration 14 CFR Part 71 [Docket No. FAA–2008–0187; Airspace Docket No. 07–ASO–27] Modification of Area Navigation Route Q–110 and Jet Route J–73; Florida Federal Aviation Administration (FAA), DOT. ACTION: Final rule. AGENCY: SUMMARY: This action extends the length of Area Navigation (RNAV) route Q–110 and makes a minor realignment of jet route J–73 in Florida. These modifications support the Florida West Coast Airspace Redesign project. The extension of Q–110 provides an RNAV route for use by aircraft transitioning between Miami Air Route Traffic Control Center (ARTCC) and Jacksonville ARTCC airspace. The extension also assists aircraft in circumnavigating military airspace associated with the Avon Park Air Force Range. The realignment of J–73 provides space for the Q–110 extension. The FAA is taking this action to enhance the safe and the efficient use of the navigable airspace in the western Florida area. DATES: Effective Date: 0901 UTC, September 25, 2008. The Director of the Federal Register approves this incorporation by reference action under 1 CFR part 51, subject to the annual revision of FAA Order 7400.9 and publication of conforming amendments. FOR FURTHER INFORMATION CONTACT: Paul Gallant, Airspace and Rules Group, Office of System Operations Airspace and AIM, Federal Aviation Administration, 800 Independence Avenue, SW., Washington, DC 20591; telephone: (202) 267–8783. SUPPLEMENTARY INFORMATION: History On April 17, 2008, the FAA published in the Federal Register a notice of proposed rulemaking (NPRM) to modify Q–110 and J–73 in western Florida (73 FR 20844) Airspace Docket No. FAA– E:\FR\FM\30JYR1.SGM 30JYR1

Agencies

[Federal Register Volume 73, Number 147 (Wednesday, July 30, 2008)]
[Rules and Regulations]
[Pages 44145-44147]
From the Federal Register Online via the Government Printing Office [www.gpo.gov]
[FR Doc No: E8-17331]


-----------------------------------------------------------------------

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2008-0822; Directorate Identifier 2008-CE-045-AD; 
Amendment 39-15621; AD 2008-16-03]
RIN 2120-AA64


Airworthiness Directives; Pilatus Aircraft Ltd. Model PC-6 Series 
Airplanes

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Final rule; request for comments.

-----------------------------------------------------------------------

SUMMARY: We are adopting a new airworthiness directive (AD) for the 
products listed above. This AD results from mandatory continuing 
airworthiness information (MCAI) issued by the aviation authority of 
another country to identify and correct an unsafe condition on an 
aviation product. The MCAI describes the unsafe condition as:

    This Airworthiness Directive (AD) is prompted due to the 
discovery of cracked or broken leaf springs P/N 6232.0175.01 
installed in the overhead flap-operating mechanism of some PC-6 
aircraft. A broken leaf spring could lead to an uncommanded flap 
retraction which could lead to hazardous situations and subsequent 
loss of control of the aircraft.

This AD requires actions that are intended to address the unsafe 
condition described in the MCAI.

DATES: This AD becomes effective August 11, 2008.
    On August 11, 2008, the Director of the Federal Register approved 
the incorporation by reference of certain publications listed in this 
AD.
    We must receive comments on this AD by August 29, 2008.

ADDRESSES: You may send comments by any of the following methods:
     Federal eRulemaking Portal: Go to http://
www.regulations.gov. Follow the instructions for submitting comments.
     Fax: (202) 493-2251.
     Mail: U.S. Department of Transportation, Docket 
Operations, M-30, West Building Ground Floor, Room W12-140, 1200 New 
Jersey Avenue, SE., Washington, DC 20590.
     Hand Delivery: U.S. Department of Transportation, Docket 
Operations, M-30, West Building Ground Floor, Room W12-140, 1200 New 
Jersey Avenue, SE., Washington, DC 20590, between 9 a.m. and 5 p.m., 
Monday through Friday, except Federal holidays.

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 this AD, the regulatory evaluation, 
any comments received, and other information. The street address for 
the Docket Office (telephone (800) 647-5527) is in the ADDRESSES 
section. Comments will be available in the AD docket shortly after 
receipt.

FOR FURTHER INFORMATION CONTACT: Doug Rudolph, Aerospace Engineer, 
Small Airplane Directorate, 901 Locust, Room 301, Kansas City, Missouri 
64106; telephone: (816) 329-4059; fax: (816) 329-4090.

SUPPLEMENTARY INFORMATION:

Discussion

    The Federal Office of Civil Aviation (FOCA), which is the aviation 
authority for Switzerland, has issued FOCA EMERGENCY AD HB-2008-242

[[Page 44146]]

(referred to after this as ``the MCAI''), to correct an unsafe 
condition for the specified products. The MCAI states:

    This Airworthiness Directive (AD) is prompted due to the 
discovery of cracked or broken leaf springs P/N 6232.0175.01 
installed in the overhead flap-operating mechanism of some PC-6 
aircraft. A broken leaf spring could lead to an uncommanded flap 
retraction which could lead to hazardous situations and subsequent 
loss of control of the aircraft.
    This AD is published by Federal Office of Civil Aviation (FOCA) 
Switzerland, as State of production and because it is possible that 
the leaf springs were not manufactured properly.
    In order to correct and control the situation, this AD requires 
the initial and repetitive inspections of the leaf springs in the 
flap operating mechanism and the replacement of broken parts.

You may obtain further information by examining the MCAI in the AD 
docket.

Relevant Service Information

    Pilatus Aircraft Limited has issued Pilatus PC-6 Service Bulletin 
No. 27-002 and Pilatus PC-6 Service Bulletin 27-003, both dated July 2, 
2008. The actions described in this service information are intended to 
correct the unsafe condition identified in the MCAI.

FAA's Determination and Requirements of the AD

    This product has been approved by the aviation authority of another 
country, and is approved for operation in the United States. Pursuant 
to our bilateral agreement with this State of Design Authority, they 
have notified us of the unsafe condition described in the MCAI and 
service information referenced above. We are issuing this AD because we 
evaluated all information provided by the State of Design Authority and 
determined the unsafe condition exists and is likely to exist or 
develop on other products of the same type design.

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.
    The MCAI allows for replacement parts with like parts that are 
prone to cracking. The reason for the 25-hour repetitive inspection is 
because the cracks are occurring quickly. We believe that allowing 
replacement with the same part numbers that are cracking when improved 
design part numbers exist allows the unsafe condition to continue. 
Therefore we are requiring replacement with the new improved part 
numbers if cracks are found.

FAA's Determination of the Effective Date

    An unsafe condition exists that requires the immediate adoption of 
this AD. The FAA has found that the risk to the flying public justifies 
waiving notice and comment prior to adoption of this rule because a 
broken leaf spring could lead to an uncommanded flap retraction and 
lead to loss of control during final approach. Therefore, we determined 
that notice and opportunity for public comment before issuing this AD 
are impracticable and that good cause exists for making this amendment 
effective in fewer than 30 days.

Comments Invited

    This AD is a final rule that involves requirements affecting flight 
safety, and we did not precede it by notice and opportunity for public 
comment. We invite you to send any written relevant data, views, or 
arguments about this AD. Send your comments to an address listed under 
the ADDRESSES section. Include ``Docket No. FAA-2008-0822; Directorate 
Identifier 2008-CE-045-AD'' at the beginning of your comments. We 
specifically invite comments on the overall regulatory, economic, 
environmental, and energy aspects of this AD. We will consider all 
comments received by the closing date and may amend this AD because of 
those comments.
    We will post all comments we receive, without change, to http://
www.regulations.gov, including any personal information you provide. We 
will also post a report summarizing each substantive verbal contact we 
receive about this AD.

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 that 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.

List of Subjects in 14 CFR Part 39

    Air transportation, Aircraft, Aviation safety, Incorporation by 
reference, Safety.

Adoption of the Amendment

0
Accordingly, under the authority delegated to me by the Administrator, 
the FAA amends 14 CFR part 39 as follows:

PART 39--AIRWORTHINESS DIRECTIVES

0
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]

0
2. The FAA amends Sec.  39.13 by adding the following new AD:

2008-16-03 Pilatus Aircraft Limited: Amendment 39-15621; Docket No. 
FAA-2008-0822; Directorate Identifier 2008-CE-045-AD.

Effective Date

    (a) This airworthiness directive (AD) becomes effective August 
11, 2008.

Affected ADs

    (b) None.

Applicability

    (c) This AD applies to Models PC-6, PC-6-H1, PC-6-H2, PC-6/350, 
PC-6/350-H1,

[[Page 44147]]

PC-6/350-H2, PC-6/A, PC-6/A-H1, PC-6/A-H2, PC-6/B-H2, PC-6/B1-H2, 
PC-6/B2-H2, PC-6/B2-H4, PC-6/C-H2, and PC-6/C1-H2 airplanes, 
manufacturer serial numbers (MSN) MSN 101 through MSN 999 and MSN 
2001 through MSN 2092, certificated in any category, with 
mechanically operated flaps and leaf springs, part number (P/N) 
6232.0175.01 installed in the overhead flap-operating mechanism.

    Note: These airplanes may also be identified as Fairchild 
Republic Company PC-6 airplanes, Fairchild Heli Porter PC-6 
airplanes, or Fairchild-Hiller Corporation PC-6 airplanes.

Subject

    (d) Air Transport Association of America (ATA) Code 27: Flight 
Controls.

Reason

    (e) The mandatory continuing airworthiness information (MCAI) 
states:
    This Airworthiness Directive (AD) is prompted due to the 
discovery of cracked or broken leaf springs P/N 6232.0175.01 
installed in the overhead flap-operating mechanism of some PC-6 
aircraft. A broken leaf spring could lead to an uncommanded flap 
retraction which could lead to hazardous situations and subsequent 
loss of control of the aircraft.
    This AD is published by Federal Office of Civil Aviation (FOCA) 
Switzerland, as State of production and because it is possible that 
the leaf springs were not manufactured properly.
    In order to correct and control the situation, this AD requires 
the initial and repetitive inspections of the leaf springs in the 
flap operating mechanism and the replacement of broken parts.

Actions and Compliance

    (f) Unless already done, do the following actions:
    (1) Before the next flight after the effective date of this AD, 
do a visual inspection of the leaf springs installed in the overhead 
flap-operating mechanism for cracks following Pilatus Aircraft Ltd. 
Pilatus PC-6 Service Bulletin No. 27-002, dated July 2, 2008.
    (2) If any cracks are found in the leaf springs installed in the 
overhead flap-operating mechanism, before further flight, remove the 
three leaf springs, P/N 6232.0175.01, installed in the overhead 
flap-operating mechanism, and replace with three new leaf springs, 
P/N 116.45.06.040, in the overhead flap-operating mechanism 
following Pilatus Aircraft Ltd. Pilatus PC-6 Service Bulletin No. 
27-003, dated July 2, 2008.
    (3) Repetitively inspect thereafter at intervals not to exceed 
25 hours time-in-service following Pilatus Aircraft Ltd. Pilatus PC-
6 Service Bulletin No. 27-002, dated July 2, 2008, until the 
modification required in paragraph (f)(2) of this AD is done. If any 
cracks are found in the leaf springs installed in the overhead flap-
operating mechanism, before further flight, remove the three leaf 
springs, P/N 6232.0175.01, and replace with three new leaf springs, 
P/N 116.45.06.040, following Pilatus Aircraft Ltd. Pilatus PC-6 
Service Bulletin No. 27-003, dated July 2, 2008.
    (4) As of the effective date of this AD, do not install any P/N 
6232.0175.01 leaf spring in the overhead flap-operating mechanism.

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) 329-4059; fax: (816) 329-4090. 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 FAA-approved. Corrective actions are considered 
FAA-approved 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 2120-0056.

Special Flight Permit

    (h) If cracks are detected during the inspection required in 
(f)(1) or (f)(3) of this AD, no further flight is permitted until 
the modification required in paragraph (f)(2) or (f)(3) of this AD 
is done.

Related Information

    (i) Refer to MCAI FOCA EMERGENCY AD HB-2008-242, dated July 4, 
2008, and Pilatus Aircraft Ltd. Pilatus PC-6 Service Bulletin No. 
27-002 and Pilatus Aircraft Ltd. Pilatus PC-6 Service Bulletin 27-
003, both dated July 2, 2008, for related information.

Material Incorporated by Reference

    (j) You must use Pilatus Aircraft Ltd. Pilatus PC-6 Service 
Bulletin No. 27-002 and Pilatus Aircraft Ltd. Pilatus PC-6 Service 
Bulletin 27-003, both dated July 2, 2008 to do the actions required 
by this AD, unless the AD specifies otherwise.
    (1) The Director of the Federal Register approved the 
incorporation by reference of this service information under 5 
U.S.C. 552(a) and 1 CFR part 51.
    (2) For service information identified in this AD, contact 
Pilatus Aircraft Ltd., Customer Liaison Manager, CH 6371 STANS, 
Switzerland; telephone: + 41 (0)41 619 6580; fax: + 41 (0)41 619 
6576; e-mail: fodermatt@pilatusaircaft.com.
    (3) You may review copies at the FAA, Central Region, Office of 
the Regional Counsel, 901 Locust, Room 506, Kansas City, Missouri 
64106; or at the National Archives and Records Administration 
(NARA). For information on the availability of this material at 
NARA, call 202-741-6030, or go to: http://www.archives.gov/federal-
register/cfr/ibr-locations.html.

    Issued in Kansas City, Missouri, on July 23, 2008.
John Colomy,
Acting Manager, Small Airplane Directorate, Aircraft Certification 
Service.
 [FR Doc. E8-17331 Filed 7-29-08; 8:45 am]
BILLING CODE 4910-13-P