Since issuing AD 20071614, we received several comments concerning the AD. We reviewed all comments submitted to the docket. The following are significant comments that influenced our decision to propose superseding AD 20071614 with a new AD:
Comment FAA discussion We received several requests to use the We approved the radiograph radiograph inspection method as an inspection procedure as an alternative method of compliance AMOC for the repetitive (AMOC) for doing the repetitive strut inspections required in AD inspection. 20071614, and the manufacturer has added the procedures for the radiograph inspection to their revised service bulletin. We received several requests to Based on the inspection methods increase the compliance time between used and the requirement to repetitive inspections because the apply corrosion inhibitor to Taylorcraft service information the strut interior at each requires the application of corrosion inspection, we believe there inhibitor to the interior of the strut is not an increased safety at each inspection. The commenters risk to the public by also requested a longer compliance increasing the compliance time time between repetitive inspections between the repetitive for land planes compared to float inspections from 24 months to equipped planes. 48 months for all airplanes. We do not have sufficient information to determine if a different inspection interval for land and float equipped airplanes is valid. We received a request to use Univair We have approved using these part numbers (P/N) UAA815 and UA854 parts as an AMOC to AD 200716 as a terminating action for the 14.
repetitive inspection requirement on
Taylorcraft Models BC12D/D1 and BCS12
D/D1 airplanes.
We received several requests to install We did not intend to preclude used vented lift struts that have been owners from installing these inspected using the criteria specified parts. Vented lift struts that in paragraph (e)(2) of AD 20071614. are inspected using the ultrasound or radiograph inspection method, that meet the Acceptance/Rejection Criteria specified in Taylorcraft Aviation, LLC Service Bulletin No. 2007001, Revision B, dated October 15, 2007, and that are treated with internal corrosion protection are considered new struts.

In addition to the comments above, we also received several reports of the following:

The following is a significant comment that did not influence our decision to propose superseding AD 20071614 with a new AD:
Comment FAA discussion We received several requests to use the Testing of Taylorcraft strut Maule Fabric Tester as an AMOC for samples with the Maule Fabric doing the repetitive strut inspection. Tester shows that both 1025 steel material, and to a greater degree 4130 steel material, resist showing a positive dent indication until a major portion of the wall thickness is consumed. Taylorcraft used 4130 steel in a majority of their wing struts during production. We have not received any data substantiating that Taylorcraft wing struts can still carry required certification loads at the reduced strut wall material thickness indicated in the testing.

[[Page 69632]]

Cracks and corrosion in the right and left wing front and aft lift struts, if not detected and corrected, could result in failure of the wing lift strut and lead to inflight separation of the wing. Relevant Service Information

We reviewed Taylorcraft Aviation, LLC Service Bulletin (SB) No. 2007001, Revision B, dated October 15, 2007.

The service information describes procedures for wing lift strut assembly corrosion inspection and/or replacement.

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 supersede AD 20071614 with a new AD that would do the following:

We have determined that the Maule Fabric Tester is not a viable AMOC to this AD.

This proposed AD would require you to use the service information described previously to perform these actions.

Costs of Compliance

We estimate that this proposed AD would affect 3,119 airplanes in the U.S. registry.

We estimate the following costs to do the proposed visual inspection:
Total cost per Total cost on Labor cost Parts cost airplane U.S. operators 1 workhour x $80 per hour = $80.............. Not applicable.................. $80 $249,520

We estimate the following costs to do the proposed repetitive ultrasound or radiograph inspection:
Total cost per Labor cost Parts cost airplane 4 workhours x $80 per hour = $320 Not applicable...... $320

We estimate the following costs to do any necessary replacements that would be required based on the results of the proposed inspections. We have no way of determining the number of airplanes that may need this replacement:
Total cost per airplane to Labor cost Parts cost replace all 4 wing lift struts 4 workhours to replace all 4 Sealed front lift $1,670 + $1,276 + struts x $80 per hour = $320. strut: $835 per $320 = $3,266. strut. 2 per
airplane = $1,670.
Sealed aft lift
strut: $638 per
strut. 2 per

airplane = $1,276.

Original design vented lift struts are no longer manufactured. We have no way of determining the cost associated with obtaining a useable vented strut.

The estimated total cost on U.S. operators includes the cumulative costs associated with AD 20071614 and any actions being added in this proposed 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 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;

[[Page 69633]]

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) 6475527) 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 39AIRWORTHINESS DIRECTIVES

1. The authority citation for part 39 continues to read as follows:

Authority: 49 U.S.C. 106(g), 40113, 44701.

Sec. 39.13 [Amended]

2. The FAA amends Sec. 39.13 by removing Airworthiness Directive (AD) 20071614, Amendment 3915153 (72 FR 45153, August 13, 2007), and by adding a new AD to read as follows:
Taylorcraft Aviation, LLC: Docket No. FAA20070286; Directorate Identifier 2007CE086AD.
Comments Due Date
(a) We must receive comments on this airworthiness directive (AD) action by January 9, 2008.
Affected ADs
(b) This AD supersedes AD 20071614, Amendment 3915153.
Applicability
(c) This AD applies to all serial numbers of Taylorcraft Models A, BC, BCS, BC65, BCS65, BC1265 (Army L2H), BCS1265, BC12D, BCS12D, BC12D1, BCS12D1, BC12D85, BCS12D85, BC12D485, BCS12D 485, (Army L2G) BF, BFS, BF60, BFS60, BF65, (Army L2K) BF 12 65, BFS65, BL, BLS, (Army L2F) BL65, BLS65, (Army L2J) BL1265, BLS1265, 19, F19, F21, F21A, F21B, F22, F22A, F22B, and F22C airplanes that:
(1) Are certificated in any category; and
(2) Do not incorporate sealed wing front lift struts, part number (P/N) MAA815, Univair P/N UAA815 (for Models BC12D/D1 and BCS12D/D1 only), or FAAapproved equivalent P/N, and sealed aft lift struts, P/N MAA854, Univair P/N UA854 (for Models BC12D/D1 and BCS12D/D1 only), or FAAapproved equivalent P/N, for all struts.

Note 1: This AD applies to all Taylorcraft models listed above, including those models not listed in Taylorcraft Aviation, LLC Service Bulletin No. 2007001, Revision B, dated October 15, 2007. If there are any other differences between this AD and the above service bulletin, this AD takes precedence.

Note 2: For the purposes of this AD, a used strut that has been inspected using the ultrasound or radiograph inspection method, meets the Acceptance/Rejection Criteria specified in Taylorcraft Aviation, LLC Service Bulletin No. 2007001, Revision B, dated October 15, 2007, and is treated with internal corrosion protection, is considered a new strut.
Unsafe Condition
(d) This AD results from our determination that the radiograph inspection method should be used in place of the eddy current inspection method currently required in AD 20071614. We are issuing this AD to detect and correct corrosion or cracks in the right and left wing front and aft lift struts, which could result in failure of the lift strut and lead to inflight separation of the wing with consequent loss of control.
Compliance
(e) To address this problem, you must do the following, unless already done:
Actions Compliance Procedures (1) Visually inspect the right Within the next 5 Follow Part 1 of and left wing front and aft hours TIS after the Instructions lift struts, (P/N AA815 and P/ August 20, 2007 in Taylorcraft N AA854, or FAAapproved (the effective Aviation, LLC equivalent P/Ns), along the date of AD 2007 Service Bulletin entire bottom 12 inches of each 1614), unless No. 2007001, strut for cracks and corrosion. one of the Revision A, dated following August 1, 2007; conditions is or Taylorcraft met: Aviation, LLC (i) The struts Service Bulletin have been No. 2007001, replaced with Revision B, dated parts specified October 15, 2007. in paragraph
(e)(2)(i) of this
AD. No further
action is
required on those
struts.
(ii) The struts
have been
replaced with
parts specified
in paragraph
(e)(2)(ii) of
this AD and have
been installed
for less than 48
months. No visual
inspection is
required. These
parts are now
subject to the
repetitive
inspection
requirement
specified in
paragraph (e)(4)
of this AD.
(2) If any cracks are found Before further Following the during the visual inspection flight after the Instructions in required in paragraph (e)(1) of visual inspection Taylorcraft this AD, replace the cracked required in Aviation, LLC strut with the following paragraph (e)(1) Service Bulletin applicable strut: of this AD. No. 2007001, Revision B, dated October 15, 2007. (i) A sealed front lift
strut, P/N MAA815, Univair
P/N UAA815 (for Models
BC12D/D1 and BCS12D/D1
only), or FAAapproved
equivalent P/N, a sealed
aft lift strut, P/N MA
A854, Univair P/N UA854
(for Models BC12D/D1 and
BCS12D/D1 only), or FAA
approved equivalent P/N.
Installing these lift
struts terminates the
repetitive inspections
required by this AD for
that strut and no further
action is required.
[[Page 69634]]
(ii) A new vented front lift
strut, P/N AA815, a new
vented aft lift strut, P/N
AA854, or FAAapproved
equivalent P/Ns, that is
treated with internal
corrosion protection
specified in Taylorcraft
Aviation, LLC Service
Bulletin No. 2007001,
Revision B, dated October
15, 2007. Installing one of
these lift struts is
subject to the repetitive
inspections required in
paragraph (e)(4) of this AD.
(3) If corrosion is found during Before further Follow Part 2 of the inspection required in flight after the the Instructions paragraph (e)(1) of this AD, do visual inspection in Taylorcraft an ultrasound or radiograph required in Aviation, LLC inspection to determine if the paragraph (e)(1) Service Bulletin corrosion exceeds the of this AD. No. 2007001, Acceptance/Rejection Criteria Revision B, dated specified in Taylorcraft October 15, 2007. Aviation, LLC Service Bulletin All ultrasound or No. 2007001, Revision B, dated radiograph October 15, 2007. inspections required by this AD must be done by one of the following: (i) A Level II or III inspector certified in the applicable ultrasound or radiograph inspection method using the guidelines established by the American Society of Nondestructive Testing or NAS 410 (formerly MIL STD410); (ii) An inspector certified to specific FAA or other acceptable government or industry standards, such as Air Transport Association (ATA) Specifications 105Guidelines for Training and Qualifying Personnel in Nondestructive Testing Methods; or
(iii) An FAA Repair Station or a Testing/ Inspection Laboratory qualified to do ultrasound or radiograph inspections. (4) If no corrosion or cracks (i) Initially Follow Part 2 of are found during the visual inspect within the Instructions inspection required in the next 3 months in Taylorcraft paragraph (e)(1) of this AD, or after August 20, Aviation, LLC if the inspection required in 2007 (the Service Bulletin paragraph (e)(3) reveals that effective date of No. 2007001, the corrosion does not exceed AD 20071614) or Revision B, dated the Acceptance/Rejection within 48 months October 15, 2007, Criteria specified in after installing using the Taylorcraft Aviation, LLC a lift strut ultrasound or Service Bulletin No. 2007001, specified in radiograph Revision B, dated October 15, paragraph inspection 2007, repetitively inspect (e)(2)(ii) of method. thereafter using the ultrasound this AD,
or radiograph inspection method whichever occurs
and treat with internal later.
corrosion protection until all (ii) Repetitively
struts are replaced with the inspect
sealed struts specified in thereafter at
paragraph (e)(2)(i) of this AD. intervals not to
If any cracks are found or exceed 48 months,
corrosion is found that exceeds except as
the Acceptance/Rejection required by
Criteria specified in paragraph
Taylorcraft Aviation, LLC (e)(4)(iii) of
Service Bulletin No. 2007001, this AD.
Revision B, dated October 15, (iii) If the
2007, during any of the initial
repetitive inspections required inspection was
by this AD, take the necessary done using the
corrective actions as eddy current
applicable in paragraph (e)(5) method as
of this AD. specified in AD
20071614, the
first ultrasound
or radiograph
repetitive
inspection must
be done within
the next 24
months after
doing the eddy
current
inspection.
Repetitively
inspect
thereafter at
intervals not to
exceed 48 months
using the
ultrasound or
radiograph
inspection method.
(5) If, during any inspection Before further Following the required in paragraphs (e)(3) flight after the Instructions in or (e)(4) of this AD, any inspection Taylorcraft cracks are found or it is required in Aviation, LLC determined that the corrosion paragraph (e)(3) Service Bulletin exceeds the Acceptance/ or (e)(4) of this No. 2007001, Rejection Criteria specified in AD. Revision B, dated Taylorcraft Aviation, LLC October 15, 2007. Service Bulletin No. 2007001,
Revision B, dated October 15,
2007, replace the lift strut
with the applicable lift strut
specified in paragraph
(e)(2)(i) or (e)(2)(ii) of this
AD.
(6) Do not install P/N AA815, P/ As of 5 hours TIS Not applicable. N AA854, or FAAapproved after the
equivalent P/N, unless: effective date of
this AD.
(i) within the last 48
months it has been
inspected using the
ultrasound or radiograph
method;
(ii) meets the Acceptance/
Rejection Criteria; and
(iii) is treated with
internal corrosion
protection as specified in
Taylorcraft Aviation, LLC
Service Bulletin No. 2007
001, Revision B, dated
October 15, 2007.
[[Page 69635]]
(7) As a terminating action for At any time after Not applicable. the repetitive inspections the effective
required by this AD, all vented date of this AD.
lift struts (P/Ns AA815, A
A854, and FAAapproved
equivalent P/Ns) may be
replaced with sealed lift
struts (P/Ns MAA815, UAA815
(for Models BC12D/D1 and BCS12
D/D1 only), MAA854, UA854
(for Models BC12D/D1 and BCS12
D/D1 only), or FAAapproved
equivalent P/Ns).
Alternative Methods of Compliance (AMOCs)
(f) The Manager, Fort Worth Airplane 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, ASW150 (c/o MIDO43), 10100 Reunion Place, Suite 650, San Antonio, Texas 78216; telephone: (210) 3083365; fax: (210) 3083370. 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.
(g) AMOCs approved for AD 20071614 are approved for this AD. Related Information
(h) To get copies of the service information referenced in this AD, contact Taylorcraft Aviation, LLC, 2124 North Central Avenue, Brownsville, Texas 78521; telephone: 9569860700. To view the AD docket, go to U.S. Department of Transportation, Docket Operations, M30, West Building Ground Floor, Room W12140, 1200 New Jersey Avenue, SE., Washington, DC 20590, or on the Internet at http://www.regulations.gov .

Issued in Kansas City, Missouri, on December 3, 2007. John R. Colomy,
Acting Manager, Small Airplane Directorate, Aircraft Certification Service.
[FR Doc. E723860 Filed 12707; 8:45 am]
BILLING CODE 491013P

FOR FURTHER INFORMATION CONTACT Andrew McAnaul, Aerospace Engineer, ASW150 (c/o MIDO43), 10100 Reunion Place, Suite 650, San Antonio, Texas 78216; telephone: (210) 3083365; fax: (210) 3083370.