[Federal Register Volume 69, Number 146 (Friday, July 30, 2004)]
[Rules and Regulations]
[Pages 45566-45570]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 04-17119]


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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. 2004-CE-05-AD; Amendment 39-13749; AD 2004-15-15]
RIN 2120-AA64


Airworthiness Directives; Air Tractor, Inc. Models AT-401, AT-
401B, AT-402, AT-402A, AT-402B, AT-501, AT-502, AT-502A, AT-502B, AT-
503A, AT-602, AT-802, and AT-802A Airplanes

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Final rule.

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

SUMMARY: The FAA supersedes Airworthiness Directive (AD) 2002-19-10, 
which applies to certain Air Tractor, Inc. (Air Tractor) Models AT-402, 
AT-402A, AT-402B, AT-602, AT-802, and AT-802A airplanes. AD 2002-19-10 
currently requires you to repetitively inspect the upper longeron and 
upper diagonal tube on the left hand side of the aft fuselage structure 
for cracks and contact the manufacturer for a repair scheme if cracks 
are found. This AD is the result of reports of the same cracks recently 
found on AT-500 series airplanes. The manufacturer has also issued new 
and revised service information that incorporates a modification to 
terminate the repetitive inspection requirements. Consequently, this AD 
retains the inspection actions required in AD 2002-19-10, adds certain 
AT-500 series airplanes to the applicability section, changes the 
compliance times, and incorporates new and revised manufacturer service 
information that contains a terminating action for the repetitive 
inspection requirement. We are issuing this AD to detect and correct 
cracks in the upper aft longeron, which could cause the fuselage to 
fail. Such failure could result in loss of control of the airplane.

DATES: This AD becomes effective on September 7, 2004.
    As of September 7, 2004, the Director of the Federal Register 
approved the incorporation by reference of certain publications listed 
in the regulation.

ADDRESSES: You may get the service information identified in this AD 
from Air Tractor, Incorporated, P.O. Box 485, Olney, Texas 76374.
    You may view the AD docket at FAA, Central Region, Office of the 
Regional Counsel, Attention: Rules Docket No. 2004-CE-05-AD, 901 
Locust, Room 506, Kansas City, Missouri 64106. Office hours are 8 a.m. 
to 4 p.m., Monday through Friday, except Federal holidays.

FOR FURTHER INFORMATION CONTACT: Andrew D. McAnaul, Aerospace Engineer, 
FAA, Fort Worth Airplane Certification Office (ACO), 2601 Meacham 
Boulevard, Fort Worth, Texas 76193-0150. Current duty station: San 
Antonio Manufacturing Inspection District Office (MIDO), 10100 Reunion 
Place, Suite 650, San Antonio, Texas 78216; telephone: (210) 308-3365; 
facsimile: (210) 308-3370.

SUPPLEMENTARY INFORMATION:

Discussion

    Has FAA taken any action to this point? We received reports of 
cracks found on the left hand upper longeron and upper diagonal support 
tubes where they intersect on the left hand side of the fuselage frame 
just forward of the vertical fin front spar attachment point on Air 
Tractor Model AT-602 airplanes. Additional cracking was later reported 
on AT-400, AT-602, and AT-802 series airplanes.
    Air Tractor started installing extended reinforcement gussets on 
AT-402 and AT-802 series airplanes at the factory to alleviate the 
crack condition from occurring. The extended reinforcement gussets were 
intended to transfer the loads away from the joint. However, an AT-802 
airplane with the extended reinforcement gusset installed during 
factory production was discovered cracked in service at the forward end 
of the gusset.
    These conditions caused us to issue AD 2002-19-10, Amendment 39-
12890 (67 FR 61481, October 1, 2002). AD 2002-19-10 currently requires 
you to do the following on certain Air Tractor Models AT-402, AT-402A, 
AT-402B, AT-602, AT-802, and AT-802A airplanes:


[[Page 45567]]


--Repetitively inspect the upper longeron and upper diagonal tube on 
the left hand side of the aft fuselage structure for cracks; and
--Contact the manufacturer for a repair scheme if cracks are found.

    What has happened since AD 2002-19-10 to initiate this AD? We have 
received additional reports of the same cracks found on an Air Tractor 
Model AT-401, AT-502 and AT-502A airplane.
    The manufacturer has also issued new and revised service 
information. The new service information contains procedures for 
replacing and modifying the upper aft longeron as a terminating action 
for the repetitive inspection requirement.
    What is the potential impact if FAA took no action? This condition, 
if not detected and corrected, could cause the fuselage to fail. Such 
failure could result in loss of control of the airplane.
    Has FAA taken any action to this point? We issued a proposal to 
amend part 39 of the Federal Aviation Regulations (14 CFR part 39) to 
include an AD that would apply to certain Air Tractor Models AT-401, 
AT-401B, AT-402, AT-402A, AT-402B, AT-501, AT-502, AT-502A, AT-502B, 
AT-503A, AT-602, AT-802, and AT-802A airplanes of the same type. This 
proposal was published in the Federal Register as a notice of proposed 
rulemaking (NPRM) on April 9, 2004 (69 FR 18848), as corrected on June 
4, 2004 (69 FR 31658). The NPRM proposed to supersede 2002-19-10 with a 
new AD that would require you to repetitively inspect the upper 
longeron and the upper diagonal tube (as applicable) on the left hand 
side of the aft fuselage structure for cracks. If cracks are found, the 
NPRM also proposed to require you to replace and modify the upper and 
diagonal aft longeron (as applicable). Replacing and modifying the 
upper aft longeron and the diagonal longeron (as applicable) would 
terminate the repetitive inspection requirement.

Comments

    Was the public invited to comment? The FAA encouraged interested 
persons to participate in the making of this amendment. The following 
presents the comments received on the proposal and FAA's responses to 
the comments:

Comment Issue No. 1: Remove the Requirement To Inspect, Replace, and 
Modify the Diagonal Longeron for Models AT-501, AT-502, AT-502A, AT-
502B, AT-503A, AT-602, AT-802, and AT-802A Airplanes

    What is the commenter's concern? The manufacturer states that we 
incorrectly proposed a requirement to inspect, replace, and modify the 
diagonal longeron on Models AT-501, AT-502, AT-502A, AT-502B, AT-503A, 
AT-602, AT-802, and AT-802A airplanes. The related service information 
referenced in the proposed AD does not require this action.
    We infer that the manufacturer wants us to remove this requirement 
for the above referenced model airplanes from the final rule AD.
    What is FAA's response to the concern? We concur with the 
commenter. We will change the final rule AD action based on this 
comment.

Comment Issue No. 2: Correct the Name of Snow Engineering Company in 
the Table in Paragraph (e) Under the Heading ``Procedures''

    What is the commenter's concern? The manufacturer states that the 
reference to Snow Engineer Co. Service Letter 195, reissued 
November 10, 2003, should be changed to Snow Engineering Co. Service 
Letter 195, reissued November 10, 2003.
    What is FAA's response to the concern? We concur with the 
commenter. We will change the final rule AD action accordingly.

Comment Issue No. 3: Correct the Federal Register Version of the Notice 
of Proposed Rulemaking (NPRM) Published on April 9, 2004 (69 FR 18848)

    What is the commenter's concern? The manufacturer wants the 
following corrections made in the final rule AD:

--In the table in paragraph (e)(2) under the heading ``Procedures'', 
reference to Service Letter 218A should be changed to Service 
Letter 195B;
--In the table in paragraph (e)(4) under the heading ``Procedures'', 
reference to Service Letter 218B, dated November 10, 2003, 
should be changed to Service Letter 213B, revised November 10, 
2003; and
--In the table in paragraph (e)(7) under the heading ``Procedures'', 
reference to Service Letter 217B, dated November 10, 2003, 
should be changed to Service Letter 217B, revised November 10, 
2003.

    What is FAA's response to the concern? We concur with the 
commenter. On June 4, 2004 (69 FR 31658), the Office of the Federal 
Register published a correction to the NPRM that incorporated all of 
the above comments. We are not changing the final rule AD based on this 
comment.

Conclusion

    What is FAA's final determination on this issue? We have carefully 
reviewed the available data and determined that air safety and the 
public interest require adopting the AD as proposed except for the 
changes discussed above and minor editorial corrections. We have 
determined that these changes and minor corrections:

--Are consistent with the intent that was proposed in the NPRM for 
correcting the unsafe condition; and
--Do not add any additional burden upon the public than was already 
proposed in the NPRM.

Changes to 14 CFR Part 39--Effect on the AD

    How does the revision to 14 CFR part 39 affect this AD? On July 10, 
2002, the FAA published a new version of 14 CFR part 39 (67 FR 47997, 
July 22, 2002), which governs the FAA's AD system. This regulation now 
includes material that relates to altered products, special flight 
permits, and alternative methods of compliance. This material 
previously was included in each individual AD. Since this material is 
included in 14 CFR part 39, we will not include it in future AD 
actions.

Costs of Compliance

    How many airplanes does this AD impact? We estimate that this AD 
affects 1,194 airplanes in the U.S. registry.
    What is the cost impact of this AD on owners/operators of the 
affected airplanes? We estimate the following costs to accomplish the 
inspection(s):

----------------------------------------------------------------------------------------------------------------
                                                              Total cost per
             Labor cost                    Parts cost            airplane        Total cost on U.S. operators
----------------------------------------------------------------------------------------------------------------
1 workhour x $65 per hour = $65....  No parts required.....             $65   $65 x 1,194 = $77,610
----------------------------------------------------------------------------------------------------------------

    We estimate the following costs to accomplish any necessary 
replacements that will be required based on the results of the 
inspection(s). We have no way of determining the number of

[[Page 45568]]

airplanes that may need this replacement:

------------------------------------------------------------------------
                                                        Total cost per
           Labor cost                 Parts cost           airplane
------------------------------------------------------------------------
27 workhours x $65 per hour =     For AT-400, AT-     For AT-400, AT-
 $1,755.                           500, and AT-600     500, and AT-600
                                   series airplanes:   series airplanes:
                                   $35.                $1,755 + $35 =
                                                       $1,790
                                  For AT-800 series   For AT-800 series
                                   airplanes: $45.     airplanes: $1,755
                                                       + $45 = $1,800.
------------------------------------------------------------------------

    What is the difference between the cost impact of this AD and the 
cost impact of AD 2002-19-10? The difference is the addition of certain 
Model AT-401, AT-401B, AT-501, AT-502, AT-502A, AT-502B, and AT-503A 
airplanes to the applicability section of this AD and the cost of 
replacing any cracked upper aft longeron. We are also removing certain 
Model AT-402 airplanes from the applicability section of this AD. There 
is no difference in cost to perform the inspection(s).

Regulatory Findings

    Will this AD impact various entities? We have 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.
    Will this AD involve a significant rule or regulatory action? 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 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 summary of the costs to comply with this AD and 
placed it in the AD Docket. You may get a copy of this summary by 
sending a request to us at the address listed under ADDRESSES. Include 
``AD Docket No. 2004-CE-05-AD'' in your request.

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 Federal Aviation Administration amends part 39 of the Federal 
Aviation Regulations (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. FAA amends Sec.  39.13 by removing Airworthiness Directive (AD) 
2002-19-10, Amendment 39-12890 (67 FR 61481, October 1, 2002), and by 
adding a new AD to read as follows:

2004-15-15 Air Tractor, Inc.: Amendment 39-13749; Docket No. 2004-
CE-05-AD; Supersedes AD 2002-19-10; Amendment 39-12890.

When Does This AD Become Effective?

    (a) This AD becomes effective on September 7, 2004.

What Other ADs Are Affected by This Action?

    (b) This AD supersedes AD 2002-19-10.

What Airplanes Are Affected by This AD?

    (c) This AD affects the following airplane models and serial 
numbers that are certificated in any category:

------------------------------------------------------------------------
                 Model                             Serial Nos.
------------------------------------------------------------------------
AT-401, AT-401B, AT-402, AT-402A, and   0716 through 1144
 AT-402B.
AT-501, AT-502, AT-502A, AT-502B, and   0037 through 0658
 AT-503A.
AT-602................................  0337 through 0664
AT-802 and AT-802A....................  0001 through 0139
------------------------------------------------------------------------

What Is the Unsafe Condition Presented in This AD?

    (d) This AD is the result of reports of cracks in the aft 
fuselage upper longeron, originally detected as excessive movement 
in the empennage due to the loss of fuselage torsional rigidity. The 
actions specified in this AD are intended to detect and correct 
cracks in the upper aft longeron, which could cause the fuselage to 
fail. Such failure could result in loss of control of the airplane.

What Must I Do To Address This Problem?

    (e) To address this problem, you must inspect the upper longeron 
and upper diagonal tube (as applicable) on the left hand side of the 
fuselage frame just forward of the vertical fin front spar 
attachment for cracks at the times specified below. You must also 
replace and modify any cracked upper and diagonal longerons (as 
applicable) found during any inspection required by this AD before 
further flight after the inspection in which cracks are found.

------------------------------------------------------------------------
                                      Inspection
 Affected models and serial nos.   compliance times       Procedures
------------------------------------------------------------------------
(1) AT-401, AT-401B, serial       Initially inspect   Inspect following
 numbers (S/Ns) 0716 through       upon the            Snow Engineering
 1144.                             accumulation of     Co. Service
                                   1,250 total hours   Letter 218A, dated
                                   (TIS) or within     November 10,
                                   the next 100        2003, as
                                   hours TIS after     specified in Snow
                                   September 7, 2004   Engineering Co.
                                   (the effective      Service Letter
                                   date of this AD),   195,
                                   whichever occurs    reissued November
                                   later.              10, 2003. Replace
                                   Repetitively        and modify
                                   inspect             following Snow
                                   thereafter at       Engineering Co.
                                   intervals not to    Service Letter
                                   exceed 100 hours    218B,
                                   TIS until the       dated November
                                   upper and           10, 2003.
                                   diagonal
                                   longerons are
                                   replaced and
                                   modified.
                                   Replacing and
                                   modifying the
                                   upper and
                                   diagonal
                                   longerons is the
                                   terminating
                                   action for the
                                   repetitive
                                   inspection
                                   requirement in
                                   this AD.

[[Page 45569]]

 
(2) AT-402, AT-402A, and AT-      Initially inspect   Inspect following
 402B, S/Ns 0716 through 1144.     upon the            Snow Engineering
                                   accumulation of     Co. Service
                                   1,250 total hours   Letter 218A, dated
                                   next 100 hours      November 10,
                                   TIS after the       2003, as
                                   last inspection     specified in Snow
                                   required by AD      Engineering Co.
                                   2002-19-10,         Service Letter
                                   whichever occurs    195,
                                   later.              reissued November
                                   Repetitively        10, 2003. Replace
                                   inspect             and modify
                                   thereafter at       following Snow
                                   intervals not to    Engineering Co.
                                   exceed 100 hours    Service Letter
                                   TIS until the       218B,
                                   upper and           dated November
                                   diagonal            10, 2003.
                                   longerons are
                                   replaced and
                                   modified.
                                   Replacing and
                                   modifying the
                                   upper and
                                   diagonal
                                   longerons is the
                                   terminating
                                   action for the
                                   repetitive
                                   inspection
                                   requirement in
                                   this AD.
(3) AT-501, AT-502, AT-502B, and  Initially inspect   Inspect following
 AT-503A, S/Ns 0037 through 0658.  upon the            Snow Engineering
                                   accumulation of     Co. Service
                                   4,800 total hours   Letter 195B, dated
                                   next 100 hours      November 10,
                                   TIS after           2003, as
                                   September 7, 2004   specified in Snow
                                   (the effective      Engineering Co.
                                   date of this AD),   Service Letter
                                   whichever occurs    195,
                                   later.              reissued November
                                   Repetitively        10, 2003. Replace
                                   inspect             and modify
                                   thereafter at       following Snow
                                   intervals not to    Engineering Co.
                                   exceed 100 hours    Service Letter
                                   TIS until the       195A,
                                   upper longeron is   revised November
                                   replaced and        10, 2003.
                                   modified.
                                   Replacing and
                                   modifying the
                                   upper longeron is
                                   the terminating
                                   action for the
                                   repetitive
                                   inspection
                                   requirement in
                                   this AD.
(4)AT-502A, S/Ns 0037 through     Initially inspect   Inspect following
 0658.                             upon the            Snow Engineering
                                   accumulation of     Co. Service
                                   2,800 total hours   Letter 195B, dated
                                   next 100 hours      November 10,
                                   TIS after           2003, as
                                   September 7, 2004   specified in Snow
                                   (the effective      Engineering Co.
                                   date of this AD),   Service Letter
                                   whichever occurs    195,
                                   later.              reissued November
                                   Repetitively        10, 2003. Replace
                                   inspect             and modify
                                   thereafter at       following Snow
                                   intervals not to    Engineering Co.
                                   exceed 100 hours    Service Letter
                                   TIS until the       195A,
                                   upper longeron is   revised November
                                   replaced and        10, 2003.
                                   modified.
                                   Replacing and
                                   modifying the
                                   upper longeron is
                                   the terminating
                                   action for the
                                   repetitive
                                   inspection
                                   requirement in
                                   this AD.
(5) AT-602, S/Ns 0337 through     Initially inspect   Inspect following
 0661.                             upon the            Snow Engineering
                                   accumulation of     Co. Service
                                   700 total hours     Letter 213A, dated
                                   next 100 hours      November 10,
                                   TIS after the       2003, as
                                   last inspection     specified in Snow
                                   required by AD      Engineering Co.
                                   2002-19-10,         Service Letter
                                   whichever occurs    195,
                                   later.              reissued November
                                   Repetitively        10, 2003. Replace
                                   inspect             and modify
                                   thereafter at       following Snow
                                   intervals not to    Engineering Co.
                                   exceed 100 hours    Service Letter
                                   TIS until the       213B,
                                   upper longeron is   revised November
                                   replaced and        10, 2003.
                                   modified.
                                   Replacing and
                                   modifying the
                                   upper longeron is
                                   the terminating
                                   action for the
                                   repetitive
                                   inspection
                                   requirement in
                                   this AD.
(6) AT-602, S/Ns 0662 through     Initially inspect   Inspect following
 0664.                             upon the            Snow Engineering
                                   accumulation of     Co. Service
                                   1,750 total hours   Letter 213A, dated
                                   next 100 hours      November 10,
                                   TIS after the       2003, as
                                   last inspection     specified in Snow
                                   required by AD      Engineering Co.
                                   2002-19-10,         Service Letter
                                   whichever occurs    195,
                                   later.              reissued November
                                   Repetitively        10, 2003. Replace
                                   inspect             and modify
                                   thereafter at       following Snow
                                   intervals not to    Engineering Co.
                                   exceed 100 hours    Service Letter
                                   TIS until the       213B,
                                   upper longeron is   revised November
                                   replaced and        10, 2003.
                                   modified.
                                   Replacing and
                                   modifying the
                                   upper longeron is
                                   the terminating
                                   action for the
                                   repetitive
                                   inspection
                                   requirement in
                                   this AD.
(7) AT-802 and AT-802A, S/Ns      Initially inspect   Inspect following
 0001 through 0004 and 0012        upon the            Snow Engineering
 through 0118.                     accumulation of     Co. Service
                                   250 total hours     Letter 217A, dated
                                   next 100 hours      November 10,
                                   TIS after the       2003, as
                                   last inspection     specified in Snow
                                   required by AD      Engineering Co.
                                   2002-19-10,         Service Letter
                                   whichever occurs    195,
                                   later.              reissued November
                                   Repetitively        10, 2003. Replace
                                   inspect             and modify
                                   thereafter at       following Snow
                                   intervals not to    Engineering Co.
                                   exceed 100 hours    Service Letter
                                   TIS until the       217B,
                                   upper longeron is   revised November
                                   replaced and        10, 2003.
                                   modified.
                                   Replacing and
                                   modifying the
                                   upper longeron is
                                   the terminating
                                   action for the
                                   repetitive
                                   inspection
                                   requirement in
                                   this AD.
(8) AT-802 and AT-802A, S/Ns      Initially inspect   Inspect following
 0005 through 0011.                upon the            Snow Engineering
                                   accumulation of     Co. Service
                                   900 total hours     Letter 217A, dated
                                   next 100 hours      November 10,
                                   TIS after the       2003, as
                                   last inspection     specified in Snow
                                   required by AD      Engineering Co.
                                   2002-19-10,         Service Letter
                                   whichever occurs    195,
                                   later.              reissued November
                                   Repetitively        10, 2003. Replace
                                   inspect             and modify
                                   thereafter at       following Snow
                                   intervals not to    Engineering Co.
                                   exceed 100 hours    Service Letter
                                   TIS until the       217B,
                                   upper longeron is   revised November
                                   replaced and        10, 2003.
                                   modified.
                                   Replacing and
                                   modifying the
                                   upper longeron is
                                   the terminating
                                   action for the
                                   repetitive
                                   inspection
                                   requirement in
                                   this AD.

[[Page 45570]]

 
(9) AT-802 and AT-802A, S/Ns      Initially inspect   Inspect following
 0119 through 0139.                upon the            Snow Engineering
                                   accumulation of     Co. Service
                                   1,750 total hours   Letter 217A, dated
                                   next 100 hours      November 10,
                                   TIS after the       2003, as
                                   last inspection     specified in Snow
                                   required by AD      Engineering Co.
                                   2002-19-10,         Service Letter
                                   whichever occurs    195,
                                   later.              reissued November
                                   Repetitively        10, 2003. Replace
                                   inspect             and modify
                                   thereafter at       following Snow
                                   intervals not to    Engineering Co.
                                   exceed 100 hours    Service Letter
                                   TIS until the       217B,
                                   upper longeron is   revised November
                                   replaced and        10, 2003.
                                   modified.
                                   Replacing and
                                   modifying the
                                   upper longeron is
                                   the terminating
                                   action for the
                                   repetitive
                                   inspection
                                   requirement in
                                   this AD.
------------------------------------------------------------------------

    (f) You may replace and modify the upper and diagonal longeron 
(as applicable) at any time as a terminating action for the 
repetitive inspection requirement in this AD. However, you must 
replace and modify the upper and diagonal longeron (as applicable) 
before further flight after any inspection in which cracks are 
found.

May I Request an Alternative Method of Compliance?

    (g) You may request a different method of compliance or a 
different compliance time for this AD by following the procedures in 
14 CFR 39.19. Unless FAA authorizes otherwise, send your request to 
your principal inspector. The principal inspector may add comments 
and will send your request to the Manager, Fort Worth Aircraft 
Certification Office (ACO), FAA. For information on any already 
approved alternative methods of compliance, contact Andrew D. 
McAnaul, Aerospace Engineer, FAA, Fort Worth ACO, 2601 Meacham 
Boulevard, Fort Worth, Texas 76193-0150. Current duty station: San 
Antonio Manufacturing Inspection District Office (MIDO), 10100 
Reunion Place, Suite 650, San Antonio, Texas 78216; telephone: (210) 
308-3365; facsimile: (210) 308-3370.

Does This AD Incorporate Any Material by Reference?

    (h) You must do the actions required by this AD following the 
instructions in Snow Engineering Co. Service Letter 195, 
reissued November 10, 2003; Snow Engineering Co. Service Letter 
195A, revised November 10, 2003; Snow Engineering Co. 
Service Letter 195B, dated November 10, 2003; Snow 
Engineering Co. Service Letter 213A, dated November 10, 
2003; Snow Engineering Co. Service Letter 213B, revised 
November 10, 2003; Snow Engineering Co. Service Letter 
217A, dated November 10, 2003; Snow Engineering Co. Service 
Letter 217B, revised November 10, 2003; Snow Engineering 
Co. Service Letter 218A, dated November 10, 2003; and Snow 
Engineering Co. Service Letter 218B, dated November 10, 
2003. The Director of the Federal Register approved the 
incorporation by reference of this service bulletin in accordance 
with 5 U.S.C. 552(a) and 1 CFR part 51. You may get a copy from Air 
Tractor, Incorporated, P.O. Box 485, Olney, Texas 76374. You may 
review copies at 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/code_of_federal_regulations/ibr_locations.html.

    Issued in Kansas City, Missouri, on July 20, 2004.
Dorenda D. Baker,
Manager, Small Airplane Directorate, Aircraft Certification Service.
[FR Doc. 04-17119 Filed 7-29-04; 8:45 am]
BILLING CODE 4910-13-P