Airworthiness Directives; Air Tractor, Inc., Models AT-402, AT-402A, and AT-402B Airplanes, 38933-38935 [E8-15456]

Download as PDF 38933 Proposed Rules Federal Register Vol. 73, No. 131 Tuesday, July 8, 2008 This section of the FEDERAL REGISTER contains notices to the public of the proposed issuance of rules and regulations. The purpose of these notices is to give interested persons an opportunity to participate in the rule making prior to the adoption of the final rules. DEPARTMENT OF TRANSPORTATION Federal Aviation Administration 14 CFR Part 39 [Docket No. FAA–2008–0749; Directorate Identifier 2008–CE–044–AD] RIN 2120–AA64 Airworthiness Directives; Air Tractor, Inc., Models AT–402, AT–402A, and AT–402B Airplanes Federal Aviation Administration (FAA), Department of Transportation (DOT). ACTION: Notice of proposed rulemaking (NPRM). ebenthall on PRODPC60 with PROPOSALS AGENCY: SUMMARY: We propose to adopt a new airworthiness directive (AD) for certain Air Tractor, Inc., (Air Tractor) Models AT–402, AT–402A, and AT–402B airplanes. This proposed AD would require you to repetitively visually inspect the rudder and vertical fin hinge attaching structure for loose fasteners and inspect the rudder or vertical fin skins, spars, hinges or brackets for cracks and/or corrosion. The AD would also require you to replace any damaged parts found as a result of the inspections and install an external doubler at the upper rudder hinge. Installation of the external doubler at the upper rudder hinge is terminating action for the repetitive inspection requirements. This proposed AD results from a report of a Model AT–402 airplane with a loose upper rudder hinge caused by fatigue. We are proposing this AD to detect and correct loose fasteners; any cracks in the rudder or vertical fin skins, spars, hinges or brackets; or corrosion of the rudder and vertical fin hinge attaching structure. Hinge failure adversely affects ability to control yaw and has led to the rudder folding over in flight. This condition could allow the rudder to contact the elevator and affect ability to control pitch with consequent loss of control. DATES: We must receive comments on this proposed AD by September 8, 2008. VerDate Aug<31>2005 14:18 Jul 07, 2008 Jkt 214001 Use one of the following addresses to comment on this proposed AD: • 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. For service information identified in this proposed AD, contact Air Tractor, Inc., P.O. Box 485, Olney, Texas 76374; telephone: (940) 564–5616; facsimile: (940) 564–5612. FOR FURTHER INFORMATION CONTACT: Andrew McAnaul, Aerospace Engineer, ASW–150 (c/o MIDO–43), 10100 Reunion Place, Suite 650, San Antonio, Texas 78216; telephone: (210) 308– 3365; facsimile: (210) 308–3370. SUPPLEMENTARY INFORMATION: ADDRESSES: Comments Invited We invite you to send any written relevant data, views, or arguments regarding this proposed AD. Send your comments to an address listed under the ADDRESSES section. Include the docket number, ‘‘FAA–2008–0749; Directorate Identifier 2008–CE–044–AD’’ at the beginning of your comments. We specifically invite comments on the overall regulatory, economic, environmental, and energy aspects of the proposed AD. We will consider all comments received by the closing date and may amend the proposed AD in light 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 concerning this proposed AD. Discussion We received two reports (one Air Tractor Model AT–602 airplane and one Model AT–802A airplane) of in-flight rudder separation at the upper attach hinge area and other reports of Models PO 00000 Frm 00001 Fmt 4702 Sfmt 4702 AT–502B, AT–602, and AT–802/802A airplanes with loose hinges, skin cracks, or signs of repairs to the affected area. Hinge failure adversely affects ability to control yaw and has led to the rudder folding over in flight. This condition could allow the rudder to contact the elevator and affect ability to control pitch with consequent loss of control. Consequently, we issued AD 2006– 23–14 (71 FR 66661, November 16, 2006). AD 2006–23–14 requires you to repetitively visually inspect the rudder and vertical fin hinge attaching structure (vertical fin skins, spars, hinges, and brackets) for loose fasteners, cracks, and/or corrosion. This AD also requires you to replace any damaged parts found as a result of the inspection and install an external doubler at the upper rudder hinge. Since issuing AD 2006–23–14, we have received a report of a Model AT– 402 airplane with a loose upper rudder hinge caused by fatigue. Therefore, we are proposing this AD to address the unsafe condition on the Model AT–402 airplanes. Relevant Service Information We have reviewed Snow Engineering Co. Service Letter #247, revised June 2, 2008; and Snow Engineering Co. Process Specification Number 145, dated December 6, 1991. The service information describes procedures for: • Inspecting (visually) the rudder and fin hinge attaching structure for loose fasteners, any cracks in the rudder or vertical fin skins, spars, hinges or brackets, or corrosion; • Replacing any damaged parts found as a result of the inspection; • Installing an external doubler at the upper rudder hinge; and • Balancing of the rudder. FAA’s Determination and Requirements of the Proposed AD We are proposing this AD because we evaluated all information and determined the unsafe condition described previously is likely to exist or develop on other products of the same type design. This proposed AD would require you to repetitively visually inspect the rudder and vertical fin hinge attaching structure for loose fasteners, any cracks in the rudder or vertical fin skins, spars, hinges or brackets, or corrosion. This proposed AD would also require you to replace any damaged parts found as a result of the inspection E:\FR\FM\08JYP1.SGM 08JYP1 38934 Federal Register / Vol. 73, No. 131 / Tuesday, July 8, 2008 / Proposed Rules and install an external doubler at the upper rudder hinge. Installation of the external doubler at the upper rudder hinge is terminating action for the repetitive inspection requirements. Costs of Compliance We estimate that this proposed AD would affect 220 airplanes in the U.S. registry. We estimate the following costs to do the proposed inspection: Labor cost Parts cost Total cost per airplane Total cost on U.S. operators 1 work-hour × $80 per hour = $80 ............................................................ Not applicable .................................. $80 $17,600 Any required repairs will vary depending upon the damage found, and any replacements required will vary based on the results of the inspection. Based on this, we have no way of determining the potential repair and/or replacement costs for each airplane or the number of airplanes that will need the repairs and/or replacements based on the result of the inspections. We estimate the following costs to do the proposed installation of the external doubler at the upper rudder hinge: Labor cost Parts cost Total cost per airplane 5 work-hours × $80 per hour = $400 ...................................................................................................................... $217 $617 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. ebenthall on PRODPC60 with PROPOSALS Regulatory Findings We have determined that this proposed AD would not have federalism implications under Executive Order 13132. This proposed AD would 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 the proposed regulation: 1. Is not a ‘‘significant regulatory action’’ under Executive Order 12866; VerDate Aug<31>2005 14:18 Jul 07, 2008 Jkt 214001 2. Is not a ‘‘significant rule’’ under the 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 proposed AD and placed it in the AD docket. Examining the AD Docket You may examine the AD docket that contains the proposed AD, the regulatory evaluation, any comments received, and other information 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 Docket Office (telephone (800) 647–5527) is located at the street address stated 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. The Proposed Amendment Accordingly, under the authority delegated to me by the Administrator, the FAA proposes to amend 14 CFR part 39 as follows: 1. The authority citation for part 39 continues to read as follows: Frm 00002 Fmt 4702 Sfmt 4702 § 39.13 [Amended] 2. The FAA amends § 39.13 by adding the following new AD: Air Tractor, Inc.: Docket No. FAA–2008– 0749; Directorate Identifier 2008–CE– 044–AD. Comments Due Date (a) We must receive comments on this airworthiness directive (AD) action by September 8, 2008. Affected ADs (b) None. Applicability (c) This AD applies to Models AT–402, AT–402A, and AT–402B airplanes, serial numbers 0694 through 1176, that are certificated in any category. Unsafe Condition (d) This AD results from a report of a Model AT–402 airplane with a loose upper rudder hinge caused by fatigue. We are issuing this AD to detect and correct loose fasteners; any cracks in the rudder or vertical fin skins, spars, hinges or brackets; or corrosion of the rudder and vertical fin hinge attaching structure. Hinge failure adversely affects ability to control yaw and has led to the rudder folding over in flight. This condition could allow the rudder to contact the elevator and affect ability to control pitch with consequent loss of control. Compliance PART 39—AIRWORTHINESS DIRECTIVES PO 00000 Authority: 49 U.S.C. 106(g), 40113, 44701. (e) To address this problem, you must do the following, unless already done: E:\FR\FM\08JYP1.SGM 08JYP1 Federal Register / Vol. 73, No. 131 / Tuesday, July 8, 2008 / Proposed Rules 38935 Actions Compliance Procedures (1) Inspect visually the rudder and vertical fin hinge attachment for loose fasteners; and inspect the rudder or vertical fin skins, spars, hinges or brackets for cracks and/or corrosion. Initially inspect when the airplane reaches a total of 3,500 hours time-in-service (TIS) or within the next 100 hours TIS after the effective date of this AD, whichever occurs later, unless already done. Thereafter, repetitively inspect at intervals not to exceed every 100 hours TIS. Installation of the external doubler at the upper rudder hinge required by paragraph (e)(2)(ii) or (e)(3) of this AD is terminating action for the repetitive inspections required by this AD. Before further flight after any inspection required by paragraph (e)(1) of this AD where you find any damaged parts. The installation of the external doubler at the upper rudder hinge required by paragraph (e)(2)(ii) or (e)(3) of this AD terminates the action for the repetitive inspections required by this AD. When the airplane reaches a total of 5,000 hours TIS after the effective date of this AD or within the next 100 hours TIS after the effective date of this AD, whichever occurs later, unless already done. The installation of the external doubler at the upper rudder hinge required by paragraph (e)(2)(ii) or (e)(3) of this AD terminates the action for the repetitive inspections required by this AD. As of the effective date of this AD ................... Follow Snow Engineering Co. Service Letter #247, revised June 2, 2008. Alternative Methods of Compliance (AMOCs) DEPARTMENT OF TRANSPORTATION (f) The Manager, Fort Worth Aircraft Certification 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: Andrew McAnaul, Aerospace Engineer, ASW–150 (c/o MIDO–43), 10100 Reunion Place, Suite 650, San Antonio, Texas 78216; telephone: (210) 308–3365; facsimile: (210) 308–3370. 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. Federal Aviation Administration This condition, if not corrected, causes mechanical interference which could result in a situation where, during emergency procedures, the landing gear cannot be extended. (2) If you find any damage as a result of any inspection required by paragraph (e)(1) of this AD, you must: (i) Replace any damaged parts with new parts and (ii) Do the installation of the external doubler at the upper rudder hinge. (3) Do the installation of the external doubler at the upper rudder hinge. (4) Do not install any rudder without the external doubler at the upper rudder hinge required by paragraph (e)(3) of this AD. Related Information ebenthall on PRODPC60 with PROPOSALS (g) To get copies of the service information referenced in this AD, contact Air Tractor, Inc., P.O. Box 485, Olney, Texas 76374; telephone: (940) 564–5616; facsimile: (940) 564–5612. To view the AD docket, go to U.S. Department of Transportation, Docket Operations, M–30, West Building Ground Floor, Room W12–140, 1200 New Jersey Avenue, SE., Washington, DC 20590, or on the Internet at http://www.regulations.gov. Issued in Kansas City, Missouri, on July 1, 2008. John Colomy, Acting Manager, Small Airplane Directorate, Aircraft Certification Service. [FR Doc. E8–15456 Filed 7–7–08; 8:45 am] BILLING CODE 4910–13–P VerDate Aug<31>2005 14:18 Jul 07, 2008 Jkt 214001 14 CFR Part 39 [Docket No. FAA–2008–0748; Directorate Identifier 2008–CE–041–AD] RIN 2120–AA64 Airworthiness Directives; EADS SOCATA Model TBM 700 Airplanes Federal Aviation Administration (FAA), Department of Transportation (DOT). ACTION: Notice of proposed rulemaking (NPRM). AGENCY: SUMMARY: We propose to adopt a new airworthiness directive (AD) for the products listed above. This proposed 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. The MCAI describes the unsafe condition as: It has been discovered that a risk of mechanical interference exists in the movement of the emergency landing gear bypass selector, due to an insufficient functional gap between a floor panel attachment lug and the landing gear control button. PO 00000 Frm 00003 Fmt 4702 Sfmt 4702 Follow Snow Engineering Co. Service Letter #247, revised June 2, 2008; and Snow Engineering Co. Process Specification Number 145, dated December 6, 1991. Follow Snow Engineering Co. Service Letter #247, revised June 2, 2008; and Snow Engineering Co. Process Specification Number 145, dated December 6, 1991. Not Applicable. The proposed AD would require actions that are intended to address the unsafe condition described in the MCAI. DATES: We must receive comments on this proposed AD by August 7, 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 E:\FR\FM\08JYP1.SGM 08JYP1

Agencies

[Federal Register Volume 73, Number 131 (Tuesday, July 8, 2008)]
[Proposed Rules]
[Pages 38933-38935]
From the Federal Register Online via the Government Printing Office [www.gpo.gov]
[FR Doc No: E8-15456]


========================================================================
Proposed Rules
                                                Federal Register
________________________________________________________________________

This section of the FEDERAL REGISTER contains notices to the public of 
the proposed issuance of rules and regulations. The purpose of these 
notices is to give interested persons an opportunity to participate in 
the rule making prior to the adoption of the final rules.

========================================================================


Federal Register / Vol. 73, No. 131 / Tuesday, July 8, 2008 / 
Proposed Rules

[[Page 38933]]



DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2008-0749; Directorate Identifier 2008-CE-044-AD]
RIN 2120-AA64


Airworthiness Directives; Air Tractor, Inc., Models AT-402, AT-
402A, and AT-402B Airplanes

AGENCY: Federal Aviation Administration (FAA), Department of 
Transportation (DOT).

ACTION: Notice of proposed rulemaking (NPRM).

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

SUMMARY: We propose to adopt a new airworthiness directive (AD) for 
certain Air Tractor, Inc., (Air Tractor) Models AT-402, AT-402A, and 
AT-402B airplanes. This proposed AD would require you to repetitively 
visually inspect the rudder and vertical fin hinge attaching structure 
for loose fasteners and inspect the rudder or vertical fin skins, 
spars, hinges or brackets for cracks and/or corrosion. The AD would 
also require you to replace any damaged parts found as a result of the 
inspections and install an external doubler at the upper rudder hinge. 
Installation of the external doubler at the upper rudder hinge is 
terminating action for the repetitive inspection requirements. This 
proposed AD results from a report of a Model AT-402 airplane with a 
loose upper rudder hinge caused by fatigue. We are proposing this AD to 
detect and correct loose fasteners; any cracks in the rudder or 
vertical fin skins, spars, hinges or brackets; or corrosion of the 
rudder and vertical fin hinge attaching structure. Hinge failure 
adversely affects ability to control yaw and has led to the rudder 
folding over in flight. This condition could allow the rudder to 
contact the elevator and affect ability to control pitch with 
consequent loss of control.

DATES: We must receive comments on this proposed AD by September 8, 
2008.

ADDRESSES: Use one of the following addresses to comment on this 
proposed AD:
     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.
    For service information identified in this proposed AD, contact Air 
Tractor, Inc., P.O. Box 485, Olney, Texas 76374; telephone: (940) 564-
5616; facsimile: (940) 564-5612.

FOR FURTHER INFORMATION CONTACT: Andrew McAnaul, Aerospace Engineer, 
ASW-150 (c/o MIDO-43), 10100 Reunion Place, Suite 650, San Antonio, 
Texas 78216; telephone: (210) 308-3365; facsimile: (210) 308-3370.

SUPPLEMENTARY INFORMATION:

Comments Invited

    We invite you to send any written relevant data, views, or 
arguments regarding this proposed AD. Send your comments to an address 
listed under the ADDRESSES section. Include the docket number, ``FAA-
2008-0749; Directorate Identifier 2008-CE-044-AD'' at the beginning of 
your comments. We specifically invite comments on the overall 
regulatory, economic, environmental, and energy aspects of the proposed 
AD. We will consider all comments received by the closing date and may 
amend the proposed AD in light 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 concerning this proposed AD.

Discussion

    We received two reports (one Air Tractor Model AT-602 airplane and 
one Model AT-802A airplane) of in-flight rudder separation at the upper 
attach hinge area and other reports of Models AT-502B, AT-602, and AT-
802/802A airplanes with loose hinges, skin cracks, or signs of repairs 
to the affected area.
    Hinge failure adversely affects ability to control yaw and has led 
to the rudder folding over in flight. This condition could allow the 
rudder to contact the elevator and affect ability to control pitch with 
consequent loss of control.
    Consequently, we issued AD 2006-23-14 (71 FR 66661, November 16, 
2006). AD 2006-23-14 requires you to repetitively visually inspect the 
rudder and vertical fin hinge attaching structure (vertical fin skins, 
spars, hinges, and brackets) for loose fasteners, cracks, and/or 
corrosion. This AD also requires you to replace any damaged parts found 
as a result of the inspection and install an external doubler at the 
upper rudder hinge.
    Since issuing AD 2006-23-14, we have received a report of a Model 
AT-402 airplane with a loose upper rudder hinge caused by fatigue. 
Therefore, we are proposing this AD to address the unsafe condition on 
the Model AT-402 airplanes.

Relevant Service Information

    We have reviewed Snow Engineering Co. Service Letter 247, 
revised June 2, 2008; and Snow Engineering Co. Process Specification 
Number 145, dated December 6, 1991. The service information describes 
procedures for:
     Inspecting (visually) the rudder and fin hinge attaching 
structure for loose fasteners, any cracks in the rudder or vertical fin 
skins, spars, hinges or brackets, or corrosion;
     Replacing any damaged parts found as a result of the 
inspection;
     Installing an external doubler at the upper rudder hinge; 
and
     Balancing of the rudder.

FAA's Determination and Requirements of the Proposed AD

    We are proposing this AD because we evaluated all information and 
determined the unsafe condition described previously is likely to exist 
or develop on other products of the same type design. This proposed AD 
would require you to repetitively visually inspect the rudder and 
vertical fin hinge attaching structure for loose fasteners, any cracks 
in the rudder or vertical fin skins, spars, hinges or brackets, or 
corrosion. This proposed AD would also require you to replace any 
damaged parts found as a result of the inspection

[[Page 38934]]

and install an external doubler at the upper rudder hinge. Installation 
of the external doubler at the upper rudder hinge is terminating action 
for the repetitive inspection requirements.

Costs of Compliance

    We estimate that this proposed AD would affect 220 airplanes in the 
U.S. registry.
    We estimate the following costs to do the proposed inspection:

----------------------------------------------------------------------------------------------------------------
                                                                                 Total cost per   Total cost on
                  Labor cost                              Parts cost                airplane      U.S. operators
----------------------------------------------------------------------------------------------------------------
1 work-hour x $80 per hour = $80.............  Not applicable.................             $80          $17,600
----------------------------------------------------------------------------------------------------------------

    Any required repairs will vary depending upon the damage found, and 
any replacements required will vary based on the results of the 
inspection. Based on this, we have no way of determining the potential 
repair and/or replacement costs for each airplane or the number of 
airplanes that will need the repairs and/or replacements based on the 
result of the inspections.
    We estimate the following costs to do the proposed installation of 
the external doubler at the upper rudder hinge:

------------------------------------------------------------------------
                                                          Total cost per
              Labor cost                   Parts cost        airplane
------------------------------------------------------------------------
5 work-hours x $80 per hour = $400....            $217             $617
------------------------------------------------------------------------

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 have determined that this proposed AD would not have federalism 
implications under Executive Order 13132. This proposed AD would 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 the proposed 
regulation:
    1. Is not a ``significant regulatory action'' under Executive Order 
12866;
    2. Is not a ``significant rule'' under the 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 proposed AD and placed it in the AD docket.

Examining the AD Docket

    You may examine the AD docket that contains the proposed AD, the 
regulatory evaluation, any comments received, and other information 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 Docket Office (telephone (800) 647-5527) 
is located at the street address stated 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.

The Proposed Amendment

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

PART 39--AIRWORTHINESS 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:

Air Tractor, Inc.: Docket No. FAA-2008-0749; Directorate Identifier 
2008-CE-044-AD.

Comments Due Date

    (a) We must receive comments on this airworthiness directive 
(AD) action by September 8, 2008.

Affected ADs

    (b) None.

Applicability

    (c) This AD applies to Models AT-402, AT-402A, and AT-402B 
airplanes, serial numbers 0694 through 1176, that are certificated 
in any category.

Unsafe Condition

    (d) This AD results from a report of a Model AT-402 airplane 
with a loose upper rudder hinge caused by fatigue. We are issuing 
this AD to detect and correct loose fasteners; any cracks in the 
rudder or vertical fin skins, spars, hinges or brackets; or 
corrosion of the rudder and vertical fin hinge attaching structure. 
Hinge failure adversely affects ability to control yaw and has led 
to the rudder folding over in flight. This condition could allow the 
rudder to contact the elevator and affect ability to control pitch 
with consequent loss of control.

Compliance

    (e) To address this problem, you must do the following, unless 
already done:

[[Page 38935]]



------------------------------------------------------------------------
             Actions                  Compliance          Procedures
------------------------------------------------------------------------
(1) Inspect visually the rudder   Initially inspect   Follow Snow
 and vertical fin hinge            when the airplane   Engineering Co.
 attachment for loose fasteners;   reaches a total     Service Letter
 and inspect the rudder or         of 3,500 hours      247,
 vertical fin skins, spars,        time-in-service     revised June 2,
 hinges or brackets for cracks     (TIS) or within     2008.
 and/or corrosion.                 the next 100
                                   hours TIS after
                                   the effective
                                   date of this AD,
                                   whichever occurs
                                   later, unless
                                   already done.
                                   Thereafter,
                                   repetitively
                                   inspect at
                                   intervals not to
                                   exceed every 100
                                   hours TIS.
                                   Installation of
                                   the external
                                   doubler at the
                                   upper rudder
                                   hinge required by
                                   paragraph
                                   (e)(2)(ii) or
                                   (e)(3) of this AD
                                   is terminating
                                   action for the
                                   repetitive
                                   inspections
                                   required by this
                                   AD.
(2) If you find any damage as a   Before further      Follow Snow
 result of any inspection          flight after any    Engineering Co.
 required by paragraph (e)(1) of   inspection          Service Letter
 this AD, you must:                required by         247,
(i) Replace any damaged parts      paragraph (e)(1)    revised June 2,
 with new parts and.               of this AD where    2008; and Snow
(ii) Do the installation of the    you find any        Engineering Co.
 external doubler at the upper     damaged parts.      Process
 rudder hinge..                    The installation    Specification
                                   of the external     Number 145, dated
                                   doubler at the      December 6, 1991.
                                   upper rudder
                                   hinge required by
                                   paragraph
                                   (e)(2)(ii) or
                                   (e)(3) of this AD
                                   terminates the
                                   action for the
                                   repetitive
                                   inspections
                                   required by this
                                   AD.
(3) Do the installation of the    When the airplane   Follow Snow
 external doubler at the upper     reaches a total     Engineering Co.
 rudder hinge.                     of 5,000 hours      Service Letter
                                   TIS after the       247,
                                   effective date of   revised June 2,
                                   this AD or within   2008; and Snow
                                   the next 100        Engineering Co.
                                   hours TIS after     Process
                                   the effective       Specification
                                   date of this AD,    Number 145, dated
                                   whichever occurs    December 6, 1991.
                                   later, unless
                                   already done. The
                                   installation of
                                   the external
                                   doubler at the
                                   upper rudder
                                   hinge required by
                                   paragraph
                                   (e)(2)(ii) or
                                   (e)(3) of this AD
                                   terminates the
                                   action for the
                                   repetitive
                                   inspections
                                   required by this
                                   AD.
(4) Do not install any rudder     As of the           Not Applicable.
 without the external doubler at   effective date of
 the upper rudder hinge required   this AD.
 by paragraph (e)(3) of this AD.
------------------------------------------------------------------------

Alternative Methods of Compliance (AMOCs)

    (f) The Manager, Fort Worth Aircraft Certification 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: 
Andrew McAnaul, Aerospace Engineer, ASW-150 (c/o MIDO-43), 10100 
Reunion Place, Suite 650, San Antonio, Texas 78216; telephone: (210) 
308-3365; facsimile: (210) 308-3370. 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.

Related Information

    (g) To get copies of the service information referenced in this 
AD, contact Air Tractor, Inc., P.O. Box 485, Olney, Texas 76374; 
telephone: (940) 564-5616; facsimile: (940) 564-5612. To view the AD 
docket, go to U.S. Department of Transportation, Docket Operations, 
M-30, West Building Ground Floor, Room W12-140, 1200 New Jersey 
Avenue, SE., Washington, DC 20590, or on the Internet at http://
www.regulations.gov.

    Issued in Kansas City, Missouri, on July 1, 2008.
John Colomy,
Acting Manager, Small Airplane Directorate, Aircraft Certification 
Service.
[FR Doc. E8-15456 Filed 7-7-08; 8:45 am]
BILLING CODE 4910-13-P