[Federal Register Volume 71, Number 150 (Friday, August 4, 2006)]
[Rules and Regulations]
[Pages 44185-44187]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: E6-12564]


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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. 97-ANE-44-AD; Amendment 39-14705; AD 2006-16-05]
RIN 2120-AA64


Airworthiness Directives; Pratt & Whitney PW4164, PW4168, and 
PW4168A Series Turbofan Engines

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Final rule.

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SUMMARY: The FAA is superseding an existing airworthiness directive 
(AD) for Pratt & Whitney PW4164, PW4168, and PW4168A series turbofan 
engines. That AD currently requires initial and repetitive torque 
checks for loose or broken front pylon mount bolts made from INCO 718 
material and MP159 material, and initial and repetitive visual 
inspections of the primary mount thrust load path. This AD requires the 
same actions, but at reduced intervals for front pylon mount bolts made 
from MP159 material. This AD results from analysis by the manufacturer 
that the MP159 material pylon bolts do not meet the full life cycle 
torque check interval requirement, in a bolt-out condition. We are 
issuing this AD to prevent front pylon mount bolt and primary mount 
thrust load path failure, which could result in an engine separating 
from the airplane.

DATES: This AD becomes effective September 8, 2006. The Director of the 
Federal Register approved the incorporation by reference of certain 
publications listed in the regulations as of September 8, 2006. The 
Director of the Federal Register previously approved the incorporation 
by reference of certain publications listed in the regulations as of 
February 6, 2003 (68 FR 28, January 2, 2003).

ADDRESSES: Contact Pratt & Whitney, 400 Main St., East Hartford, CT 
06108; telephone (860) 565-7700, fax (860) 565-1605 for the service 
information identified in this AD.
    You may examine the AD docket at the FAA, New England Region, 
Office of the Regional Counsel, 12 New England Executive Park, 
Burlington, MA. You may examine the service information, at the FAA, 
New England Region, Office of the Regional Counsel, 12 New England 
Executive Park, Burlington, MA.

FOR FURTHER INFORMATION CONTACT: Barbara Caufield, Aerospace Engineer, 
Engine Certification Office, FAA, Engine and Propeller Directorate, 12 
New England Executive Park, Burlington, MA 01803; telephone (781) 238-
7146, fax (781) 238-7199.

SUPPLEMENTARY INFORMATION: The FAA proposed to amend 14 CFR part 39 
with a proposed AD. The proposed AD applies to Pratt & Whitney PW4164, 
PW4168, and PW4168A series turbofan engines. We published the proposed 
AD in the Federal Register on December 29, 2005 (70 FR 77075). That 
action proposed to require initial and repetitive torque checks for 
loose or broken front pylon mount bolts made from INCO 718 material and 
MP159 material. That action also proposed to require initial and 
repetitive visual inspections of the primary mount thrust load path, 
but at reduced intervals from AD 2000-16-02R1 for front pylon mount 
bolts made from MP159 material.

Examining the AD Docket

    You may examine the AD Docket (including any comments and service 
information), by appointment, between 8 a.m. and 4:30 p.m., Monday 
through

[[Page 44186]]

Friday, except Federal holidays. See ADDRESSES for the location.

Comments

    We provided the public the opportunity to participate in the 
development of this AD. We received no comments on the proposal or on 
the determination of the cost to the public.

Bolt Life Limit Clarification

    For clarification, we removed three bolt life limit references from 
paragraphs (f)(1), (f)(2), and (f)(3) and added paragraph (f)(4). The 
added paragraph states to remove from service front pylon mount bolts 
P/N 54T670, at or before reaching the life limit of 11,000 CSN.

Conclusion

    We have carefully reviewed the available data and determined that 
air safety and the public interest require adopting the AD with the 
changes described previously.

Costs of Compliance

    About 60 engines installed on airplanes of U.S. registry are 
affected by this AD. We estimate that it will take about four work-
hours per engine to perform the actions, and that the average labor 
rate is $65 per work-hour. Required parts will cost about $26,500 per 
engine. Based on these figures, we estimate the total cost of the AD to 
U.S. operators to be $1,605,600.

Special Flight Permits Paragraph Removed

    Paragraph (g) of the AD we are superseding, AD 2000-16-02R1, 
contains a paragraph pertaining to special flight permits. Even though 
this final rule does not contain a similar paragraph, we have made no 
changes with regard to the use of special flight permits to operate the 
airplane to a repair facility to do the work required by this AD. In 
July 2002, we published a new Part 39 that contains a general authority 
regarding special flight permits and airworthiness directives. See 
Docket No. FAA-2004-8460, Amendment 39-9474 (69 FR 47998, July 22, 
2002). Thus, when we now supersede ADs we will not include a specific 
paragraph on special flight permits unless we want to limit the use of 
that general authority granted in section 39.23.

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 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 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. 97-ANE-44-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 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 removing Amendment 39-12989 (68 FR 28, 
January 2, 2003) and by adding a new airworthiness directive, Amendment 
39-14705, to read as follows:

2006-16-05 Pratt & Whitney: Amendment 39-14705. Docket No. 97-ANE-
44-AD.

Effective Date

    (a) This AD becomes effective September 8, 2006.

Affected ADs

    (b) This AD supersedes AD 2000-16-02R1.

Applicability

    (c) This AD applies to Pratt & Whitney (PW) PW4164, PW4168, and 
PW4168A series turbofan engines, with front pylon mount bolts, part 
number (P/N) 54T670 or 51U615, installed. These engines are 
installed on, but not limited to, Airbus A330 series airplanes.

Unsafe Condition

    (d) This AD results from analysis by the manufacturer that MP159 
material pylon bolts do not meet the full life cycle torque check 
interval requirement, in a bolt-out condition. We are issuing this 
AD to prevent front pylon mount bolt and primary mount thrust load 
path failure, which could result in an engine separating from the 
airplane.

Compliance

    (e) You are responsible for having the actions required by this 
AD performed within the compliance times specified unless the 
actions have already been done.

INCO 718 Material Bolts Torque Checks

    (f) Perform initial and repetitive torque checks of INCO 718 
material front pylon mount bolts, P/N 54T670, and replace, if 
necessary, with new bolts, using the Accomplishment Instructions of 
PW Alert Service Bulletin (ASB) PW4G-100-A71-9, Revision 1, dated 
November 24, 1997, as follows:
    (1) For front pylon mount bolts, P/N 54T670, with fewer than 
1,000 cycles-since-new (CSN) on the effective date of this AD, do 
the following using Part (A) of the Accomplishment Instructions of 
the ASB:
    (i) Perform an initial torque check before accumulating 1,250 
CSN or at the next engine removal for cause, whichever occurs 
sooner.
    (ii) Thereafter, perform torque checks at intervals of no fewer 
than 750 or no more than 1,250 cycles-in-service (CIS) since last 
torque check.
    (2) For front pylon mount bolts, P/N 54T670, with 1,000 CSN or 
more but fewer than 5,750 CSN on the effective date of this AD, do 
the following using Part (A) of the Accomplishment Instructions of 
the ASB:
    (i) Perform an initial torque check within 250 CIS after the 
effective date of this AD, or at the next engine removal for any 
cause, whichever occurs sooner.
    (ii) Thereafter, perform torque checks at intervals of no fewer 
than 750 or no more than 1,250 CIS since last torque check.
    (3) For front pylon mount bolts, P/N 54T670, with 5,750 CSN or 
more on the effective date of this AD, do the following using Part 
(B) of the Accomplishment Instructions of the ASB:

[[Page 44187]]

    (i) Perform an initial torque check within 250 CIS after the 
effective date of this AD, or before the next engine removal for any 
cause, whichever occurs sooner.
    (ii) Thereafter, perform torque checks at intervals of no fewer 
than 750 or no more than 1,250 CIS since last torque check.
    (4) Remove from service front pylon mount bolts P/N 54T670, at 
or before reaching the life limit of 11,000 CSN.
    (5) Before further flight, replace all four bolts using Part 
(A), Paragraph 1(D) of the Accomplishment Instructions of the ASB, 
if any of the bolts are loose or broken.

MP159 Material Bolts Inspections

    (g) Perform initial and repetitive torque checks of front pylon 
mount bolts, P/N 51U615, using the Accomplishment Instructions of PW 
ASB PW4G-100-A71-32, dated April 15, 2005, as follows:
    (1) For front pylon mount bolts with fewer than 2,200 CSN on the 
effective date of this AD, perform the initial torque inspection 
before accumulating 2,700 CSN, or at the next engine removal for any 
cause, whichever occurs sooner.
    (2) For front pylon mount bolts with 2,200 CSN or more on the 
effective date of this AD, perform the initial torque check within 
the next 500 CIS, or at the next engine removal for any cause, 
whichever occurs sooner.
    (3) Thereafter, perform torque inspections at intervals not to 
exceed 2,700 CIS since last torque inspection.
    (4) Before further flight, replace all four bolts using 
Paragraph 1.E. of the Accomplishment Instructions of the ASB, if any 
are loose or broken.

Primary Mount Thrust Load Path Inspections

    (h) Perform initial and repetitive visual inspections of the 
primary mount thrust load path using the Accomplishment Instructions 
of PW ASB PW4G-100-A71-18, Revision 2, dated January 15, 2002, as 
follows:
    (1) For forward engine mount assemblies with fewer than 1,000 
CSN on the effective date of this AD, perform the initial visual 
inspection at the earlier of the following:
    (i) Before accumulating 1,250 CSN; or
    (ii) The next engine removal for any cause.
    (2) For forward engine mount assemblies with 1,000 CSN or more 
on the effective date of this AD, perform the initial visual 
inspection within 250 CIS after the effective date of this AD, or 
the next engine removal for any cause, whichever occurs sooner.
    (3) Thereafter, perform visual inspections at intervals of no 
fewer than 750 or no more than 1,250 CIS since-last-visual-
inspection.
    (4) Before further flight, replace all cracked parts with 
serviceable parts and inspect the primary thrust load path 
components using Paragraph 4 of the Accomplishment Instructions of 
the ASB.

Terminating Action

    (i) Replacement of the forward engine mount bearing housing, P/N 
59T794 or P/N 54T659 with P/N 52U420, using SB PW4G-100-71-22, dated 
January 15, 2002, constitutes terminating action to the inspection 
requirements of paragraph (h) of this AD.

Alternative Methods of Compliance

    (j) The Manager, Engine Certification Office, has the authority 
to approve alternative methods of compliance for this AD if 
requested using the procedures found in 14 CFR 39.19.

Related Information

    (k) None.

Material Incorporated by Reference

    (l) You must use the Pratt & Whitney service information 
specified in Table 1 of this AD to perform the actions required by 
this AD. The Director of the Federal Register approved the 
incorporation by reference of Pratt & Whitney Alert Service Bulletin 
(ASB) PW4G-100-A71-32, dated April 15, 2005, in accordance with 5 
U.S.C. 552(a) and 1 CFR part 51. The Director of the Federal 
Register previously approved the incorporation by reference of Pratt 
& Whitney ASB PW4G-100-A71-9, Revision 1, dated November 24, 1997, 
as of October 16, 2000, and, ASB PW4G-100-A71-18, Revision 2, dated 
January 15, 2002, and ASB PW4G-100-71-22, dated January 15, 2002, as 
of February 6, 2003. Contact Pratt & Whitney, 400 Main St., East 
Hartford, CT 06108; telephone (860) 565-7700, fax (860) 565-1605 for 
the service information identified in this AD. You may review copies 
at the Docket Management Facility; U.S. Department of 
Transportation, 400 Seventh Street, SW., Nassif Building, Room PL-
401, Washington, DC 20590-0001, on the Internet at http://dms.dot.gov, 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.

                                      Table 1.--Incorporation by Reference
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 Alert Service Bulletin (ASB) or
    Service Bulletin (SB) No.               Page                 Revision                      Date
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ASB PW4G-100-A71-9...............  1....................  1....................  November 24, 1997.
                                   2....................  Original.............  July 31, 1997.
                                   3....................  1....................  November 24, 1997.
                                   4-7..................  Original.............  July 31, 1997.
                                   8-9..................  1....................  November 24, 1997.
    Total Pages: 11..............  10-11................  Original.............  July 31, 1997.
ASB PW4G-100-A71-18..............  1-2..................  2....................  January 15, 2002.
                                   3....................  1....................  December 9, 1999.
                                   4....................  2....................  January 15, 2002.
                                   5-6..................  Original.............  September 15, 1999.
                                   7....................  2....................  January 15, 2002.
    Total Pages: 12..............  8-12.................  Original.............  September 15, 1999.
SB PW4G-100-71-22................  ALL..................  Original.............  January 15, 2002.
    Total Pages: 8
ASB PW4G-100-A71-32..............  ALL..................  Original.............  April 15, 2005.
    Total Pages: 9
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    Issued in Burlington, Massachusetts, on July 27, 2006.
Francis A. Favara,
Manager, Engine and Propeller Directorate, Aircraft Certification 
Service.
 [FR Doc. E6-12564 Filed 8-3-06; 8:45 am]
BILLING CODE 4910-13-P