70 FR 247 pgs. 76381-76385 - Airworthiness Directives; Pratt Whitney JT9D-7R4 Turbofan Engines
Type: RULEVolume: 70Number: 247Pages: 76381 - 76385
Docket number: [Docket No. FAA-2005-23072; Directorate Identifier 2005-NE-38-AD; Amendment 39-14430; AD 2005-26-09]
FR document: [FR Doc. 05-24448 Filed 12-23-05; 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 39-14430; AD 2005-26-09]
RIN 2120-AA64
Airworthiness Directives; Pratt Whitney JT9D-7R4 Turbofan Engines
AGENCY:
Federal Aviation Administration (FAA), Department of Transportation (DOT).
ACTION:
Final rule; request for comments.
SUMMARY:
The FAA is adopting a new airworthiness directive (AD) for Pratt Whitney (PW) JT9D-7R4 turbofan engines. This AD requires inspection of the blade root thickness of 1st stage fan blades identified by part number (P/N) and serial number (SN) in this AD, by a repair station approved by PW to perform the inspection. This AD results from a report that a repair station created their own repair and performed it on 520 1st stage fan blades, without approval from PW. 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 January 11, 2006.
We must receive any comments on this AD by February 27, 2006.
ADDRESSES:
Use one of the following addresses to comment on this AD:
• DOT Docket Web site: Go to http://dms.dot.gov and follow the instructions for sending your comments electronically.
• Government-wide rulemaking Web site: Go to http://www.regulations.gov and follow the instructions for sending your comments electronically.
• Mail: Docket Management Facility; U.S. Department of Transportation, 400 Seventh Street, SW., Nassif Building, Room PL-401, Washington, DC 20590-0001.
• Fax: (202) 493-2251.
• Hand Delivery: Room PL-401 on the plaza level of the Nassif Building, 400 Seventh Street, SW., Washington, DC, between 9 a.m. and 5 p.m., Monday through Friday, except Federal holidays.
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:
In May 2005, we received a report from Airfoil Technologies International (ATI), of the United Kingdom, that their repair station created their own repair and performed it on 520 1st stage fan blades, without approval from PW. The repairs were made to a critical area of the fan blade root. PW requires source demonstration by each repair station before they approve the repair station to perform blade repairs, including the repair that should have been performed to these 1st stage fan blades, known as Repair-23. This requirement exists due to PW's concern with proper blending in a critical area of the blade root. This condition, if not corrected, could result in 1st stage fan blade fracture and uncontained engine failure, resulting in possible damage to the airplane.
FAA's Determination and Requirements of this AD
The unsafe condition described previously is likely to exist or develop on other PW JT9D-7R4 turbofan engines of the same type design. For that reason, we are issuing this AD to prevent 1st stage fan blade fracture and uncontained engine failure, resulting in possible damage to the airplane. This AD requires, before installing the 1st stage fan blades that are listed by P/N and SN in Table 1 of this AD, or if already installed, at the next 1st stage fan blade exposure:
• Checking 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.
• Removing 1st stage fan blades without a circled, letter I, on the approved marking area of the outboard side of the blade platform if installed; and
• Sending 1st stage fan blades to a source-substantiation-approved repair station, approved by PW, for inspection of the blade root thickness; and
• Returning to service 1st stage fan blades that pass the inspection, after properly marking the blade.
FAA's Determination of the Effective Date
Since an unsafe condition exists that requires the immediate adoption of this AD, we have found that notice and opportunity for public comment before issuing this AD are impracticable, and that good cause exists for making this amendment effective in less than 30 days.
Comments Invited
This AD is a final rule that involves requirements affecting flight safety and was not preceded by notice and an opportunity for public comment; however, we invite you to send us any written relevant data, views, or arguments regarding this AD. Send your comments to an address listed under ADDRESSES. Include "AD Docket No. FAA-2005-23072; Directorate Identifier 2005-NE-38-AD" in the subject line of your comments. We specifically invite comments on the overall regulatory, economic, environmental, and energy aspects of the rule that might suggest a need to modify it.
We will post all comments we receive, without change, to http:// dms.dot.gov, including any personal information you provide. We will also post a report summarizing each substantive verbal contact with FAA personnel concerning this AD. Using the search function of the DMS Web site, anyone can find and read the comments in any of our dockets, including the name of the individual who sent the comment (or signed the comment on behalf of an association, business, labor union, etc.). You may review the DOT's complete Privacy Act Statement in the Federal Register published on April 11, 2000 (65 FR 19477-78) or you may visit http://dms.dot.gov.
Examining the AD Docket
You may examine the docket that contains the AD, any comments received, and any final disposition in person at the Docket Management Facility Docket Office between 9 a.m. and 5 p.m., Monday through Friday, except Federal holidays. The Docket Office (telephone (800) 647-5227) is located on the plaza level of the Department of Transportation Nassif Building at the street address stated in ADDRESSES. Comments will be available in the AD docket shortly after the DMS receives them.
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 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 the regulation:
1. Is not a "significant regulatory action" under Executive Order 12866;
2. Is not a "significant rule" under the DOT Regulatory Policies and Procedures (44 FR 11034, February 26, 1979); and
3. Will not have a significant economic impact, positive or negative, on a substantial number of small entities under the criteria of the Regulatory Flexibility Act.
We prepared a 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
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
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 adding the following new airworthiness directive:
2005-26-09Pratt Whitney: Amendment 39-14430. Docket No. FAA-2005-23072; Directorate Identifier 2005-NE-38-AD.
Effective Date
(a) This airworthiness directive (AD) becomes effective January 11, 2006.
Affected ADs
(b) None.
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 747and 767 airplanes.
Unsafe Condition
(d) This AD results from a report that a repair station created their own repair and performed it on 520 1st stage fan blades, without approval from PW. 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) Before installing the 1st stage fan blades that are listed by part number and serial number in Table 1 of this AD, or if already installed, at the next 1st stage fan blade exposure, do the following:
| Part number | Serial no. |
|---|---|
| 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 |
| 5001341-023 | JW2313 |
| 5001341-024 | JW2498 |
| 5001341-025 | JW2541 |
| 5001341-026 | JW2560 |
| 5001341-027 | JW2589 |
| 5001341-028 | JW2639 |
| 5001341-029 | JW2760 |
| 5001341-030 | JW2792 |
| 5001341-031 | M0579 |
| 5001341-032 | MG2825 |
| 5001341-033 | MG5477 |
| 5001341-034 | 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 |
(1) 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.
(2) 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.
(3) Send 1st stage fan blades to a source-substantiation-approved repair station, approved by PW, for inspection of the blade root thickness. You can find information on inspecting the blade root thickness in Engine Manual Section 72-31-02, Inspect-01, and Repair-23.
(g) For 1st stage fan blades that pass the inspection referenced in paragraph (f) of this AD:
(1) 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.
(2) Return the 1st stage fan blades to service.
Alternative Methods of Compliance
(h) 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
(i) None.
Issued in Burlington, Massachusetts, on December 16, 2005.
Peter A. White,
Acting Manager, Engine and Propeller Directorate, Aircraft Certification Service.
[FR Doc. 05-24448 Filed 12-23-05; 8:45 am]
BILLING CODE 4910-13-P