97-17-04: Fan Hubs

97-17-04 Pratt & Whitney: Amendment 39-10106. Docket 97-ANE-08. Supersedes AD 97-02-11, Amendment 39-9896. Applicability: Pratt & Whitney JT8D-209, -217, -217C, and -219 series turbofan engines with front compressor front hub (fan hub), Part Number (P/N) 5000501-01, installed. These engines are installed on but not limited to McDonnell Douglas MD-80 series aircraft. Note 1: This airworthiness directive (AD) applies to each engine identified in the preceding applicability provision, regardless of whether it has been modified, altered, or repaired in the area subject to the requirements of this AD. For engines that have been modified, altered, or repaired so that the performance of the requirements of this AD is affected, the owner/operator must request approval for an alternative method of compliance in accordance with paragraph (c) of this AD. The request should include an assessment of the effect of the modification, alteration, or repair on the unsafe condition addressed by this AD; and, if the unsafe condition has not been eliminated, the request should include specific proposed actions to address it. Compliance: Required as indicated, unless accomplished previously. To prevent fan hub failure due to tierod, counterweight, or bushed hole cracking, which could result in an uncontained engine failure and damage to the aircraft, accomplish the following: (a) Inspect fan hubs for cracks in accordance with the Accomplishment Instructions, Paragraph A, Part 1, and, if applicable, Paragraph B, of PW ASB No. A6272, dated September 24, 1996, as follows: (1) For fan hubs identified by Serial Numbers (S/Ns) in Table 2 of this AD, after the fan hub has accumulated more than 4,000 cycles since new (CSN), as follows: (i) Initially inspect within 315 cycles in service (CIS) from the effective date of this AD, or 4,315 CSN, whichever occurs later. (ii) Thereafter, reinspect after accumulating 2,500 CIS since last inspection, but not to exceed 10,000 CIS since last inspection. (2) For fan hubs identified by S/Ns in Appendix A of PW ASB No. A6272, dated September 24, 1996, after the fan hub has accumulated more than 4,000 CSN, as follows: (i) Select an initial inspection interval from Table 1 of this AD, and inspect accordingly. Table 1 Initial Inspection Reinspection 1. Within 1,050 cycles in service (CIS) after the effective date of AD 97-02-11, March 5, 1997, or prior to accumulating 5,050 CSN, whichever occurs later; After accumulating 2,500 CIS since last inspection, but not to exceed 6,000 CIS since last inspection. OR OR 2. Within 990 CIS after the effective date of AD 97-02-11, March 5, 1997, or prior to accumulating 4,990 CSN, whichever occurs later; After accumulating 2,500 CIS since last inspection, but not to exceed 8,000 CIS since last inspection. OR OR 3. Within 965 CIS after the effective date of AD 97-02-11, March 5, 1997, or prior to accumu- lating 4,965 CSN, whichever occurs later. After accumulating 2,500 CIS since last inspection, but not to exceed 10,000 CIS since last inspection. Table 2 Hubs with traveler notations Non CCD Non CCD Non CCD Non CCD CCD Hub CCD Hub CCD Hub M67663 M67802 P66880 S25545 P66747 R33099 S25292 M67671 M67812 P66885 S25558 P66756 R33107 S25299 M67675 M67826 R32732 S25564 P66800 R33113 S25301 M67681 M67829 R32733 S25598 P66814 R33124 S25302 M67685 M67830 R32735 S25618 P66819 R33131 S25308 M67686 M67831 R32740 S25621 P66831 R33132 S25312 M67687 M67832 R32741 S25637 R32767 R33133 S25316 M67697 M67834 R32810 S25640 R32787 R33136 S25323 M67700 M67843 R32849 T50693 R32792 R33152 S25334 M67706 M67849 R32850 T50752 R32795 R33157 S25335 M67710 M67858 S25222 T50785 R32796 R33163 S25337 M67712 M67866 S25464 T50791 R32800 R33165 S25344 M67713 M67868 S25481 T50792 R32807 R33168 S25369 M67714 M67869 S25483 T50819 R32856 R33171 S25377 M67715 M67872 S25484 T50823 R32860 R33173 S25378 M67716 M67888 S25486 T50827 R32870 R33180 S25381 M67717 N71771 S25488 T50874 R32883 R33181 S25394 M67722 N71804 S25489 T50875 R32905 R33189 S25399 M67723 N71806 S25490 T51058 R32926 R33194 S25402 M67725 N71810 S25491 T51104 R32930 R33198 S25406 M67726 N71811 S25492 R32952 R33201 S25411 M67730 N71875 S25494 R32964 R33202 S25413 M67731 N71876 S25495 R32966 R33207 S25414 M67746 N71921 S25497 R32971 S25193 S25415 M67751 N71965 S25498 R32976 S25195 S25418 M67753 N72062 S25499 R32981 S25207 S25419 M67764 N72126 S25500 R32990 S25208 S25421 M67765 N72152 S25501 R32994 S25221 S25422 M67784 N72162 S25502 R33000 S25229 S25430 M67791 N72207 S25505 R33004 S25238 S25437 M67792 N72216 S25506 R33040 S25246 S25439 M67793 N72219 S25507 R33055 S25248 S25449 M67794 N72242 S25508 R33059 S25250 R33186 M67795 P66693 S25509 R33077 S25256 S25528 M67796 P66695 S25514 R33080 S25262 M67797 P66696 S25529 R33082 S25268 M67798 P66698 S25532 R33086 S25278 M67799 P66699 S25541 R33087 S25287 M67800 P66737 S25543 R33089 S25288 M67801 P66753 S25544 R33090 (ii) Thereafter, reinspect at intervals that correspond to the selected inspection interval. (3) If a fan hub is identified in both Table 2 of this AD and Appendix A of PW ASB No. A6272, dated September 24, 1996, inspect in accordance with paragraph (a)(1) or (a)(2) of this AD, whichever occurs first. (4) For fan hubs with S/Ns not listed in Table 2 of this AD or in Appendix A of PW ASB No. A6272, dated September 24, 1996, after the fan hub has accumulated more than 4,000 CSN, inspect the next time the fan hub is in the shop at piece-part level, but not to exceed 10,000 CIS after March 5, 1997. (5) Prior to further flight, remove from service fan hubs found cracked or that exceed the bushed hole acceptance criteria described in PW ASB No. A6272, dated September 24, 1996. (b) Report the number of completed inspections on a monthly basis and report findings of cracked fan hubs in accordance with Accomplishment Instructions, Paragraph F, of Attachment 1 to PW ASB No. A6272, dated September 24, 1996, within 48 hours after inspection to Robert Guyotte, Manager, Engine Certification Branch, Engine Certification Office, FAA, Engine and Propeller Directorate, 12 New England Executive Park, Burlington, MA 01803-5299; telephone (617) 238-7142, fax (617) 238-7199; Internet: Robert.Guyotte@faa.dot.gov. Reporting requirements have been approved by the Office of Management and Budget and assigned OMB control number 2120-0056. (c) An alternative method of compliance or adjustment of the compliance time that provides an acceptable level of safety may be used if approved by the Manager, Engine Certification Office. Operators shall forward their requests through an appropriate FAA Principal Maintenance Inspector, who may add comments and then send it to the Manager, Engine Certification Office. Alternative methods of compliance approved for AD 97-02-11 are also considered approved for this AD. Note 2: Information concerning the existence of approved alternative methods of compliance with this AD, if any, may be obtained from the Engine Certification Office. (d) Special flight permits may be issued in accordance with sections 21.197 and 21.199 of the Federal Aviation Regulations (14 CFR 21.197 and 21.199) to operate the aircraft to a location where the requirements of this AD can be accomplished. (e) The actions required by this AD shall be done in accordance with the following PW ASB: Document No. Pages Date A6272 1-21 Original September 24, 1996 NDIP-892 1-30 A September 15, 1996 Attachment I AI-1- AI-4 A September 15, 1996 Total Pages: 55. This incorporation by reference was approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. Copies may be obtained from Pratt & Whitney, 400 Main St., East Hartford, CT 06108; telephone (860) 565-6600, fax (860) 565-4503. Copies may be inspected at the FAA, New England Region, Office of the Assistant Chief Counsel, 12 New England Executive Park, Burlington, MA; or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC. (f) This amendment becomes effective on September 30, 1997.