Enter Heading

Category - Engine
Effective Date - 03/30/1995
Recurring - Yes
Supersedes - T89-05-52
 Superseded by - N/A
Amendment 39-9091
Docket 93-ANE-81.
Supersedes telegraphic airworthiness directive (AD) T89-05-52

Applicability: Pratt & Whitney (PW) Models JT8D1-1A,-1B,-7, -7A, -7B, -9, -9A, -11, -15, -15A, -17, -17A, -17R and-17AR turbofan engines, with combustion chamber outer case (CCOC), Part Number (P/N) 796761 or 806675. These engines are installed on but not limited to Boeing 727 and 737 series, and McDonnell Douglas DC-9 series aircraft.

Compliance: Required as indicated, unless accomplished previously.

To prevent rupture of the CCOC, which could result in fire, engine cowl release, or aircraft damage, accomplish the following:

(a) Except for CCOC's cited in paragraph (c) of this airworthiness directive (AD), ultrasonically inspected CCOC's installed in engines that have not previously been ultrasonically inspected in accordance with telegraphic AD T89-05-52 for cracks within 10 days or 75 cycles in service (CIS) after the effective date of this AD, whichever occurs later, in accordance with paragraph 2.A.(3) and Appendix B of PW Alert Service Bulletin (ASB) No. 5842, Revision 3, dated October 10, 1990.

(b) For CCOC's not installed in engines and not cited in paragraph (c) of this AD, and that have not been previously been ultrasonically inspected in accordance with telegraphic AD T89-05-52, ultrasonically inspect for cracks prior to returning the CCOC's to service in accordance with paragraph 2.A.(5) and Appendix C of PW ASB No. 5842, Revision 3, dated October 10, 1990.

(c) For CCOC's P/N 806675, listed by serial number in Table 1 and paragraph 2.A.(10) of PW ASB No. 5842, Revision 3, dated October 10, 1990, accomplish the following:

(1) At the next removal of the CCOC from the engine after the effective date of this AD, ultrasonically inspect CCOC's for cracks in accordance with paragraph 2.A.(5) and Appendix C of PW ASB No. 5842, Revision 3, dated October 10, 1990.

(2) Remove from service or reinspect CCOC's in accordance with paragraphs (d) and (e), respectively, of this AD.

(3) Mark CCOC's with new part numbers in accordance with paragraphs 2.A.(5)(c) and 2.A.(11) of PW ASB No. 5842, Revision 3, dated October 10, 1990, that;

(i) have accumulated at least 2,500 CIS since new and

(ii) exhibit a maximum ultrasonic signal amplitude of less than 40% during the inspection conducted subsequent to 2,500 CIS since new.

(d) Remove from service and replace with a serviceable part CCOC's with maximum ultrasonic signal amplitude determined as follows:

(1) CCOC's with greater than or equal to 360%, prior to further flight, with no ferry flight permitted in accordance with paragraph (i) of this AD below.

(2) CCOC's with less than 360%, but greater than or equal to 240%, prior to further flight, with ferry flight permitted, in accordance with paragraph (i) of this AD below.

(e) Thereafter, ultrasonically inspect CCOC's, P/N's 796761 and 806675, for cracks at intervals determined by maximum ultrasonic signal amplitude, in accordance with paragraph 2.A.(3) and Appendix B of PW ASB No. 5842, Revision 3, dated October 10, 1990, for installed CCOC's; or paragraph 2.A.(5) and Appendix C of PW ASB No. 5842, Revision 3, dated October 10, 1990, for uninstalled CCOC's; as applicable, as follows:

(1) For those CCOC's that meet the criteria described in paragraph (d) of this AD, remove from service and replace with a serviceable part.

(2) For those CCOC's with less than 240%, but greater than or equal to 100%, at intervals of 1,000 CIS since last inspection.

(3) For those CCOC's with less than 100%, but greater than or equal to 40%, at intervals of 2,500 CIS since last inspection.

(4) For those CCOC's with less than 40%, inspect at the next removal of the CCOC from the engine since last inspection.

(f) Mark CCOC's with new P/N's, in accordance with paragraphs 2.A(5)(c) and 2.A(11) of PW ASB No. 5842, Revision 3, dated October 10, 1990, that meet the following criteria:

(1) At least two consecutive ultrasonic inspections have been performed on th CCOC; and

(2) The second inspection was performed in accordance with paragraph (b) of this AD; and

(3) Have accumulated at least 2,500 CIS since the first ultrasonic inspection; and

(4) That exhibit a maximum ultrasonic signal amplitude of less than 40% in both inspections.

(g) Remarking of CCOC's with a new P/N in accordance with paragraph (f) of this AD constitutes terminating action to the inspection requirements of this AD.

(h) 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. The request should be forwarded through an appropriate FAA Principal Maintenance Inspector, who may add comments and then send it to the Manager, Engine Certification Office.

Note: Information concerning the existence of approved alternative method of compliance with this AD, if any, may be obtained from the Engine Certification Office.

(i) 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.

(j) The actions required by this AD shall be done in accordance with the following alert service bulletins:

Document No.            Pages             Revision            Date

PW ASB No. 5842         1-17              3                   Oct. 10, 1990

Appendix A              1-2               Original            May  26, 1989

Appendix B              1-23              3                   Oct. 10, 1990

Appendix C              1-7               Original            May  26, 1989

Total pages: 49.

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. 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 Stree, NW., suite 700, Washington, DC.

(k) This amendment becomes effective on March 30, 1995.

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. Copies may be inspected at the FAA, New England Region, Office of the Assistant Chief Council, 12 New England Executive Park, Burlington, MA; or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC.

(l) This amendment becomes effective on March 30, 1995.

FOR FURTHUR INFORMATION CONTACT:

Mark A. Rumizen, Aerospace Engineer, Engine Certification Office, FAA, Engine and Propeller Directorate, 12 New England Executive Park, Burlington, MA 01803-5299; telephone (617) 238-7137, fax (617) 238-7199.