72 FR 169 pgs. 50204-50208 - Airworthiness Directives; Pratt Whitney JT9D-7R4 Turbofan Engines
Type: RULEVolume: 72Number: 169Pages: 50204 - 50208
Docket number: [Docket No. FAA-2005-23072; Directorate Identifier 2005-NE-38-AD; Amendment 39-15186; AD 2007-18-06]
FR document: [FR Doc. E7-17210 Filed 8-30-07; 8:45 am]
Agency: Transportation Department
Sub Agency: Federal Aviation Administration
Official PDF Version: PDF Version
DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA-2005-23072; Directorate Identifier 2005-NE-38-AD; Amendment 39-15186; AD 2007-18-06]
RIN 2120-AA64
Airworthiness Directives; Pratt Whitney JT9D-7R4 Turbofan Engines
AGENCY:
Federal Aviation Administration (FAA), Department of Transportation (DOT).
ACTION:
Final rule.
SUMMARY:
The FAA is superseding an existing airworthiness directive (AD) for Pratt Whitney (PW) JT9D-7R4 turbofan engines. That AD currently requires inspection of the blade root thickness of 1st stage fan blades identified by part number (P/N) and serial number (SN) in the AD. This AD requires the same actions but corrects 12 P/Ns, adds 10 part SNs, and adds the definition of next fan blade exposure to the compliance section. This AD results from the discovery of inaccurate part quantity, part numbers, and serial numbers used in AD 2005-26-09. We are issuing this AD to prevent 1st stage fan blade fracture and uncontained engine failure, resulting in possible damage to the airplane.
DATES:
This AD becomes effective October 5, 2007.
ADDRESSES:
The Docket Operations office is located at U.S. Department of Transportation, Docket Operations, M-30, West Building Ground Floor, Room W12-140, 1200 New Jersey Avenue, SE., Washington, DC 20590.
FOR FURTHER INFORMATION CONTACT:
Kevin Donovan, Aerospace Engineer, Engine Certification Office, FAA, Engine and Propeller Directorate, 12 New England Executive Park, Burlington, MA 01803-5299; telephone (781) 238-7743, fax (781) 238-7199.
SUPPLEMENTARY INFORMATION:
The FAA proposed to amend 14 CFR part 39 by superseding AD 2005-26-09, Amendment 39-14430 (70 FR 76381, December 27, 2005), with a proposed AD. The proposed AD applies to (PW) JT9D-7R4 turbofan engines. We published the proposed AD in the Federal Register on March 1, 2007 (72 FR 9276). That action proposed to require inspection of the blade root thickness of 1st stage fan blades identified by P/N and SN.
Examining the AD Docket
You may examine the AD docket on the Internet at http://dms.dot.gov; or in person at the Docket Operations office between 9 a.m. and 5 p.m., Monday through Friday, except Federal holidays. The AD docket contains this AD, the regulatory evaluation, any comments received, and other information. The street address for the Docket Operations office (telephone (800) 647-5527) is provided in the ADDRESSES section. Comments will be available in the AD docket shortly after receipt.
Comments
We provided the public the opportunity to participate in the development of this AD. We have considered the comment received.
Duplicate Serial Number
One commenter asks us to remove a duplicate serial number from Table 1. The commenter states that we listed two fan blades, P/N 831021, serial number NS8559 in Table 1. We agree. We deleted one of the duplicate SNs.
Corrections to the NPRM
We found one typographical error in a blade SN. We changed ND6924 to ND8924. Blade SN ND6924 is not included in the population of suspect blades. We also found the population is not 531, it is 538. We corrected these errors in the NPRM.
Conclusion
We have carefully reviewed the available data, including the comments received, and determined that air safety and the public interest require adopting the AD with the changes described previously. We have determined that these changes will cause only a minimal increase to the economic burden on any operator and will not increase the scope of the AD.
Costs of Compliance
We estimate that this AD will affect 538 1st stage fan blades installed on JT9D-7R4 turbofan engines installed on airplanes of U.S. registry. We also estimate that it will take about 0.5 work-hour per 1st stage fan blade to perform the proposed actions, and that the average labor rate is $80 per work-hour. Based on these figures, we estimate the total cost of this AD to U.S. operators to be $21,520.
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 at the address listed under ADDRESSES .
List of Subjects in 14 CFR Part 39
Air transportation, Aircraft, Aviation safety, Safety.
Adoption of the Amendment
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
1. The authority citation for part 39 continues to read as follows:
Authority:
49 U.S.C. 106(g), 40113, 44701.
§ 39.13 [Amended]
2. The FAA amends § 39.13 by removing Amendment 39-14430 70 FR 76381, December 27, 2005, and by adding a new airworthiness directive, Amendment 39-15196, to read as follows:
2007-18-06Pratt Whitney: Amendment 39-15196. Docket No. FAA-2005-23072; Directorate Identifier 2005-NE-38-AD.
Effective Date
(a) This airworthiness directive (AD) becomes effective October 5, 2007.
Affected ADs
(b) This AD supersedes AD 2005-26-09.
Applicability
(c) This AD applies to Pratt Whitney (PW) JT9D-7R4 turbofan engines. These engines are installed on, but not limited to, Airbus A300 and A310, and Boeing 747 and 767 airplanes.
Unsafe Condition
(d) This AD results from the discovery of inaccurate part quantity, part numbers (P/Ns), and serial numbers (SNs) used in AD 2005-26-09. We are issuing this AD to prevent 1st stage fan blade fracture and uncontained engine failure, resulting in possible damage to 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.
(f) For 1st stage fan blades that are listed by P/N and SN in Table 1 of this AD, do the following:
| P/Ns | SNs |
|---|---|
| 5001341-022 | JW2804 |
| 5001341-022 | JW0354 |
| 5001341-022 | ND5746 |
| 5001341-022 | ND5770 |
| 5001341-022 | JW3992 |
| 5001341-022 | ND8615 |
| 5001341-022 | JW0442 |
| 5001341-022 | JW2317 |
| 5001341-022 | ND8631 |
| 5001341-022 | ND8635 |
| 5001341-022 | JW4624 |
| 5001341-022 | NE0394 |
| 5001341-022 | NE0153 |
| 5001341-022 | NN8054 |
| 5001341-022 | JW4693 |
| 5001341-022 | ND7304 |
| 5001341-022 | MG6108 |
| 5001341-022 | MG5862 |
| 5001341-022 | MG5619 |
| 5001341-022 | NE0308 |
| 5001341-022 | NE0200 |
| 5001341-022 | MG6797 |
| 5001341-022 | JW0230 |
| 5001341-022 | ND5652 |
| 5001341-022 | ND5775 |
| 5001341-022 | JW0251 |
| 5001341-022 | ND5719 |
| 5001341-022 | JW0248 |
| 5001341-022 | ND5785 |
| 5001341-022 | ND5676 |
| 5001341-022 | ND5661 |
| 5001341-022 | JW0265 |
| 5001341-022 | ND5699 |
| 5001341-022 | ND5767 |
| 5001341-022 | JW0259 |
| 5001341-022 | ND5680 |
| 5001341-022 | ND5749 |
| 5001341-022 | JW0235 |
| 5001341-022 | ND5776 |
| 5001341-022 | ND8580 |
| 5001341-022 | MG6039 |
| 5001341-022 | ND9127 |
| 5001341-022 | JW4287 |
| 5001341-022 | JW0262 |
| 5001341-022 | JW0445 |
| 5001341-022 | JW4665 |
| 5001341-022 | MG5901 |
| 5001341-022 | NE0303 |
| 5001341-022 | ND8703 |
| 5001341-022 | JW4574 |
| 5001341-022 | JW4286 |
| 5001341-022 | JW4491 |
| 5001341-022 | JW4630 |
| 5001341-022 | JW4391 |
| 5001341-022 | MG6550 |
| 5001341-022 | MG6776 |
| 5001341-022 | JW4586 |
| 5001341-022 | JW0352 |
| 5001341-022 | JW4261 |
| 5001341-022 | MG6135 |
| 5001341-022 | JW4685 |
| 5001341-022 | MG6772 |
| 5001341-022 | MG6793 |
| 5001341-022 | MG7111 |
| 5001341-022 | ND8618 |
| 5001341-022 | JW0644 |
| 5001341-022 | JW4631 |
| 5001341-022 | JW4651 |
| 5001341-022 | JW0234 |
| 5001341-022 | JW4646 |
| 804121 | NN9016 |
| 804121 | VJ3393 |
| 804121 | PX3694 |
| 804121 | RK9168 |
| 804121 | PX5023 |
| 804121 | VJ3324 |
| 804121 | VJ3504 |
| 804121 | NN9115 |
| 804121 | NN8936 |
| 804121 | PX3816 |
| 804121 | VJ3412 |
| 804121 | RK9163 |
| 804121 | VJ3447 |
| 804121 | RK9230 |
| 804121 | RK9109 |
| 804121 | PX4627 |
| 804121 | RK8990 |
| 804121 | SP9459 |
| 804121 | RK8656 |
| 804121 | NN8933 |
| 804121 | VJ3444 |
| 804121 | ND5864 |
| 804121 | NN9020 |
| 804121 | RK8905 |
| 804121 | SR1733 |
| 804121 | NN9047 |
| 804121 | PX3692 |
| 804121 | PX3786 |
| 804121 | NN9025 |
| 804121 | NN9007 |
| 804121 | RK9100 |
| 804121 | VJ3399 |
| 804121 | PX4970 |
| 804121 | PX5013 |
| 804121 | RK8904 |
| 804121 | NN8986 |
| 804121 | NN8829 |
| 804121 | VJ3459 |
| 804121 | RK9143 |
| 804121 | VJ3414 |
| 804121 | NN9028 |
| 804121 | SP1557 |
| 804121 | PX5003 |
| 804121 | PX5042 |
| 804121 | VJ3475 |
| 804121 | ND7330 |
| 804121 | PX3714 |
| 831021-003 | NS8913 |
| 831021-003 | ND6512 |
| 831021-003 | ND6941 |
| 831021-003 | ND9576 |
| 831021-003 | NS7555 |
| 831021-003 | NS8286 |
| 831021-003 | NS7447 |
| 831021-003 | ND6488 |
| 831021-003 | ND8296 |
| 831021-003 | ND6956 |
| 831021-003 | ND7879 |
| 831021-003 | ND6509 |
| 831021-003 | ND9814 |
| 831021-003 | NN7331 |
| 831021-003 | ND6991 |
| 831021-003 | ND6894 |
| 831021-003 | NS6413 |
| 831021-003 | ND7344 |
| 831021-003 | ND6947 |
| 831021-003 | NN8732 |
| 831021-003 | ND8536 |
| 831021-003 | ND6946 |
| 831021-003 | ND6723 |
| 831021-003 | ND9294 |
| 831021-003 | ND9290 |
| 831021-003 | ND6013 |
| 831021-003 | ND8937 |
| 831021-003 | NS7160 |
| 831021-003 | NS6435 |
| 831021-003 | NS6591 |
| 831021-003 | ND9558 |
| 831021-003 | NS8479 |
| 831021-003 | NS9382 |
| 831021-003 | ND8965 |
| 831021-003 | ND9837 |
| 831021-003 | ND5959 |
| 831021-003 | NS6491 |
| 831021-003 | NS9072 |
| 831021-003 | ND9625 |
| 831021-003 | ND6714 |
| 831021-003 | ND6820 |
| 831021-003 | ND8972 |
| 831021-003 | NE0286 |
| 831021-003 | NE0347 |
| 831021-003 | ND8010 |
| 831021-003 | ND8956 |
| 831021-003 | ND9535 |
| 831021-003 | ND9831 |
| 831021-003 | NE0227 |
| 831021-003 | ND8283 |
| 831021-003 | ND9730 |
| 831021-003 | NN7656 |
| 831021-003 | NS7775 |
| 831021-003 | ND9815 |
| 831021-003 | ND6135 |
| 831021-003 | NS8491 |
| 831021-003 | NS6395 |
| 831021-003 | NS8584 |
| 831021-003 | NN7272 |
| 831021-003 | MG7159 |
| 831021-003 | NS6592 |
| 831021-003 | ND7862 |
| 831021-003 | ND6684 |
| 831021-003 | NN7744 |
| 831021-003 | ND7480 |
| 831021-003 | ND7873 |
| 831021-003 | ND6827 |
| 831021-003 | ND6576 |
| 831021-003 | ND9261 |
| 831021-003 | NS8686 |
| 831021-003 | ND9052 |
| 831021-003 | ND6897 |
| 831021-003 | ND6565 |
| 831021-003 | NN8966 |
| 831021-003 | PX3707 |
| 831021-003 | NS7031 |
| 831021-003 | ND6584 |
| 831021-003 | ND9883 |
| 831021-003 | NS6535 |
| 831021-003 | ND7852 |
| 831021-003 | ND9662 |
| 831021-003 | ND7871 |
| 831021-003 | JW0106 |
| 831021-003 | ND8305 |
| 831021-003 | NS6409 |
| 831021-003 | NE0442 |
| 831021-003 | ND9095 |
| 831021-003 | ND9302 |
| 831021-003 | ND9023 |
| 831021-003 | ND8009 |
| 831021-003 | ND8477 |
| 831021-003 | ND7492 |
| 831021-003 | ND8776 |
| 831021-003 | ND6524 |
| 831021-003 | ND6704 |
| 831021-003 | ND8911 |
| 831021-003 | ND8789 |
| 831021-003 | ND8798 |
| 831021-003 | ND6407 |
| 831021-003 | ND7668 |
| 831021-003 | ND9179 |
| 831021-003 | NE0421 |
| 831021-003 | ND6513 |
| 831021-003 | ND6744 |
| 831021-003 | ND7654 |
| 831021-003 | ND7870 |
| 831021-003 | ND9759 |
| 831021-003 | ND6561 |
| 831021-003 | ND5826 |
| 831021-003 | ND6031 |
| 831021-003 | ND8714 |
| 831021-003 | ND8872 |
| 831021-003 | ND6678 |
| 831021-003 | ND6629 |
| 831021-003 | ND8995 |
| 831021-003 | NE0302 |
| 831021-003 | ND6405 |
| 831021-003 | NS8300 |
| 831021-003 | NS8769 |
| 831021-003 | NS7147 |
| 831021-003 | ND6649 |
| 831021-003 | ND7766 |
| 831021-003 | NS7864 |
| 831021-003 | NS8734 |
| 831021-003 | ND6677 |
| 831021-003 | NS7911 |
| 831021-003 | ND8205 |
| 831021-003 | ND8804 |
| 831021-003 | ND6639 |
| 831021-003 | ND8994 |
| 831021-003 | ND7275 |
| 831021-003 | ND9195 |
| 831021-003 | ND6178 |
| 831021-003 | ND8639 |
| 831021-003 | ND9760 |
| 831021-003 | ND9108X |
| 831021-003 | ND6427 |
| 831021-003 | ND6590 |
| 831021-003 | NS6551 |
| 831021-003 | JW1158 |
| 831021-003 | ND6412 |
| 831021-003 | ND7922 |
| 831021-003 | NS8678 |
| 831021-003 | ND8930 |
| 831021-003 | ND6596 |
| 831021-003 | ND9570 |
| 831021-003 | NN9027 |
| 831021-003 | ND6446 |
| 831021-003 | NE0275 |
| 831021-003 | ND9917 |
| 831021-003 | NS7919 |
| 831021-003 | NS7907 |
| 831021-003 | ND6583 |
| 831021-003 | NN7420 |
| 831021-003 | ND7746 |
| 831021-003 | ND8187 |
| 831021-003 | NN8999 |
| 831021-003 | ND6043 |
| 831021-003 | ND7880 |
| 831021-003 | NN7175 |
| 831021-003 | ND9816 |
| 831021-003 | ND8174 |
| 831021-003 | ND6045 |
| 831021-003 | NS7562 |
| 831021-003 | JW0075 |
| 831021-003 | ND6848 |
| 831021-003 | ND8531 |
| 831021-003 | ND6311 |
| 831021-003 | ND8144 |
| 831021-003 | ND5798 |
| 831021-003 | ND8113 |
| 831021-003 | ND9642 |
| 831021-003 | ND7436 |
| 831021-003 | ND9054 |
| 831021-003 | ND9683 |
| 831021-003 | ND5991 |
| 831021-003 | ND6026 |
| 831021-003 | ND6616 |
| 831021-003 | ND6530 |
| 831021-003 | NE0374 |
| 831021-003 | ND6364 |
| 831021-003 | ND7718 |
| 831021-003 | ND6473 |
| 831021-003 | ND6436 |
| 831021-003 | ND6887 |
| 831021-003 | ND6518 |
| 831021-003 | ND6479 |
| 831021-003 | NS6330 |
| 831021-003 | ND7264 |
| 831021-003 | ND8151 |
| 831021-003 | ND6562 |
| 831021-003 | NS8776 |
| 831021-003 | ND6519 |
| 831021-003 | ND7659 |
| 831021-003 | NS9049 |
| 831021-003 | NS6861 |
| 831021-003 | ND9571 |
| 831021-003 | ND9346 |
| 831021-003 | ND6501 |
| 831021-003 | NS8505 |
| 831021-003 | ND9338 |
| 831021-003 | ND9775 |
| 831021-003 | ND6485 |
| 831021-003 | ND7165 |
| 831021-003 | ND9371 |
| 831021-003 | ND9537 |
| 831021-003 | NS7889 |
| 831021-003 | ND7877 |
| 831021-003 | ND8670 |
| 831021-003 | ND9032 |
| 831021-003 | ND8781 |
| 831021-003 | ND8604 |
| 831021-003 | ND9329 |
| 831021-003 | ND9110 |
| 831021-003 | ND5997 |
| 831021-003 | ND6027 |
| 831021-003 | ND9589 |
| 831021-003 | ND6575 |
| 831021-003 | ND6592 |
| 831021-003 | ND6463 |
| 831021-003 | NS8583 |
| 831021-003 | NS8590 |
| 831021-003 | NS8567 |
| 831021-003 | NS6795 |
| 831021-003 | NS7110 |
| 831021-003 | NS6587 |
| 831021-003 | NS6404 |
| 831021-003 | ND6486 |
| 5001341-022 | JW0942 |
| 5001341-022 | ND9231 |
| 5001341-022 | JW4812 |
| 5001341-022 | ND6555 |
| 5001341-022 | M1375 |
| 5001341-022 | MG6627 |
| 5001341-022 | MG6794 |
| 5001341-022 | ND9399 |
| 5001341-022 | NE0084 |
| 5001341-022 | MG6252 |
| 5001341-022 | ND7422 |
| 5001341-022 | ND7043 |
| 5001341-022 | MG5722 |
| 5001341-022 | MG5918 |
| 5001341-022 | ND6984 |
| 5001341-022 | M0839 |
| 5001341-022 | M0922 |
| 5001341-022 | M0938 |
| 5001341-022 | M1117 |
| 5001341-022 | M0307 |
| 5001341-022 | JW3871 |
| 5001341-022 | M1125 |
| 5001341-022 | M1149 |
| 5001341-022 | JW2681 |
| 5001341-022 | M0270 |
| 5001341-022 | M1120 |
| 5001341-022 | M0205 |
| 5001341-022 | AE9352 |
| 5001341-022 | JW3492 |
| 5001341-022 | ND6148 |
| 5001341-022 | ND8907 |
| 5001341-022 | M1235 |
| 5001341-022 | MG5585 |
| 5001341-022 | ND8436 |
| 5001341-022 | MG5696 |
| 5001341-022 | ND8704 |
| 5001341-022 | JW2284 |
| 5001341-022 | JW2313 |
| 5001341-022 | JW2498 |
| 5001341-022 | JW2541 |
| 5001341-022 | JW2560 |
| 5001341-022 | JW2589 |
| 5001341-022 | JW2639 |
| 5001341-022 | JW2760 |
| 5001341-022 | JW2792 |
| 5001341-022 | M0579 |
| 5001341-022 | MG2825 |
| 5001341-022 | MG5477 |
| 5001341-022 | ND5917 |
| 5001341-022 | JW1976 |
| 5001341-022 | JW2653 |
| 5001341-022 | JW2608 |
| 5001341-022 | JW2727 |
| 5001341-022 | JW2764 |
| 5001341-022 | JW2265 |
| 5001341-022 | JW2474 |
| 5001341-022 | JW2396 |
| 5001341-022 | JW3554 |
| 5001341-022 | JW2667 |
| 5001341-022 | MG2302 |
| 5001341-022 | MG3972 |
| 5001341-022 | JW3930 |
| 5001341-022 | ND6749 |
| 5001341-022 | M1172 |
| 5001341-022 | JW2104 |
| 5001341-022 | JW2519 |
| 5001341-022 | JW2640 |
| 5001341-022 | JW2517 |
| 5001341-022 | JW2663 |
| 5001341-022 | JW2823 |
| 5001341-022 | M0536 |
| 5001341-022 | JW2725 |
| 5001341-022 | MG5917 |
| 5001341-022 | JW0681 |
| 5001341-022 | JW0711 |
| 5001341-022 | JW0740 |
| 5001341-022 | JW0807 |
| 5001341-022 | JW1089 |
| 5001341-022 | JW1362 |
| 5001341-022 | JW2065 |
| 5001341-022 | MG2434 |
| 5001341-022 | MG2846 |
| 5001341-022 | JW0806 |
| 804121 | NN9854 |
| 804121 | NN9024 |
| 804121 | NN9032 |
| 804121 | PX5029 |
| 804121 | NN9050 |
| 804121 | NS8242 |
| 804121 | NS8260 |
| 804121 | PX4273 |
| 804121 | PX4378 |
| 804121 | RL0857 |
| 804121 | RX8763 |
| 804121 | NS8331 |
| 804121 | NN9824 |
| 804121 | MG6979 |
| 804121 | MG7023 |
| 804121 | MG7055 |
| 804121 | RK8914 |
| 804121 | RL0023 |
| 804121 | PX4328 |
| 804121 | RK9008 |
| 804121 | TG1506 |
| 804121 | KK8226 |
| 804121 | MG2604 |
| 804121 | NS6691 |
| 804121 | RK8968 |
| 804121 | NN9917 |
| 804121 | RK7824 |
| 804121 | M1343 |
| 804121 | NS6559 |
| 804121 | NS7767 |
| 804121 | NE0363 |
| 804121 | PX3771 |
| 804121 | NN9972 |
| 804121 | RL0460 |
| 804121 | RK8310 |
| 804121 | SR2115 |
| 804121 | TG2826 |
| 804121 | PX5018 |
| 804121 | PX5002 |
| 831021-003 | ND7627 |
| 831021-003 | ND6890 |
| 831021-003 | ND7461 |
| 831021-003 | ND9616 |
| 831021-003 | NE0413 |
| 831021-003 | NS8825 |
| 831021-003 | NS6350 |
| 831021-003 | NS7168 |
| 831021-003 | NS7705 |
| 831021-003 | NS7848 |
| 831021-003 | ND9128 |
| 831021-003 | ND9541 |
| 831021-003 | ND9671 |
| 831021-003 | ND9684 |
| 831021-003 | NE0277 |
| 831021-003 | NE0384 |
| 831021-003 | NE0396 |
| 831021-003 | ND6421 |
| 831021-003 | ND6599 |
| 831021-003 | ND6614 |
| 831021-003 | ND7847 |
| 831021-003 | ND8346 |
| 831021-003 | ND8853 |
| 831021-003 | ND8915 |
| 831021-003 | NS8719 |
| 831021-003 | NS8838 |
| 831021-003 | NT0169 |
| 831021-003 | NS9584 |
| 831021-003 | ND6445 |
| 831021-003 | ND6834 |
| 831021-003 | ND7467 |
| 831021-003 | ND8887 |
| 831021-003 | ND6520 |
| 831021-003 | NS8611 |
| 831021-003 | NS7640 |
| 831021-003 | NN7037 |
| 831021-003 | NN7590 |
| 831021-003 | NN8120 |
| 831021-003 | NN8573 |
| 831021-003 | NN9719 |
| 831021-003 | NS8784 |
| 831021-003 | TB6B367 |
| 831021-003 | NN9557 |
| 831021-003 | NN9710 |
| 831021-003 | NS8374 |
| 831021-003 | NS8770 |
| 831021-003 | NS9022 |
| 831021-003 | NS8416 |
| 831021-003 | NS6474 |
| 831021-003 | ND8912 |
| 831021-003 | NT0108 |
| 831021-003 | NS8836 |
| 831021-003 | NN8310 |
| 831021-003 | NS8559 |
| 5001341-022 | JW2313 |
| 5001341-022 | JW2498 |
| 5001341-022 | JW2541 |
| 5001341-022 | JW2560 |
| 5001341-022 | JW2589 |
| 5001341-022 | JW2639 |
| 5001341-022 | JW2760 |
| 5001341-022 | JW2792 |
| 5001341-022 | JW4713 |
| 5001341-022 | MG6743 |
| 5001341-022 | ND8924 |
| 831021-003 | ND9177 |
| 831021-003 | ND9496 |
| 831021-003 | NS7894 |
| 831021-003 | NS9072 |
| 804121 | PX3805 |
| 804121 | PX4266 |
For Engines Installed on an Airplane
(1) For engines installed on an airplane with affected 1st stage fan blades installed, perform the actions in paragraphs (f)(3) through (f)(6)(ii) of this AD at the next 1st stage fan blade exposure.
For Engines Not Installed on an Airplane, or, for Affected 1st Stage Fan Blades Not Installed in an Engine
(2) For engines not installed on an airplane with affected 1st stage fan blades installed, or, for affected 1st stage fan blades not installed in an engine, paragraph (h) of this AD applies.
1st Stage Fan Blade Check
(3) Check the 1st stage fan blade for a circled, letter I, on the approved marking area of the outboard side of the blade platform. If the blade has this marking, no further action is required.
(4) Remove 1st stage fan blades without a circled, letter I, on the approved marking area of the outboard side of the blade platform, if installed.
(5) Inspect the 1st stage fan blade root thickness. You can find information on inspecting the blade root thickness in PW Engine Manual Section 72-31-02, Inspect-01, and Repair-23.
(6) For 1st stage fan blades that pass the inspection referenced in paragraph (f)(5) of this AD:
(i) Vibropeen the letter I and a circle around that letter, on the approved marking area of the outboard side of the blade platform. You can find information on approved blade marking in the JT9D-7R4 Engine Manual, Section 72-31-02, Typical Repair-13, Mark Repair Codes.
(ii) Return the 1st stage fan blades to service.
Definition
(g) For the purposes of paragraph (f)(1) of this AD, next 1st stage fan blade exposure is:
(1) When any 1st stage fan blade is removed from the engine; or
(2) When the 1st stage fan hub is removed from the engine.
Prohibited Installation
(h) After the effective date of this AD, do not install any 1st stage fan blades listed in Table 1 of this AD on any airplane, unless the actions of this AD have been done to the 1st stage fan blades.
Alternative Methods of Compliance
(i) 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
(j) None.
Issued in Burlington, Massachusetts, on August 24, 2007.
Mark A. Rumizen,
Acting Manager, Engine and Propeller Directorate, Aircraft Certification Service.
[FR Doc. E7-17210 Filed 8-30-07; 8:45 am]
BILLING CODE 4910-13-P