CCOC Rupture

Category - Engine
Effective Date - 01/02/1997
Recurring - No
Supersedes - 87-11-07 R1, 87-11-07 and 95-08-15
Superseded by - N/A
Amendment 39-9820. Docket 93-ANE-79.
Supersedes AD 87-11-07 R1, Amendment 39-6360, AD 87-11-07, Amendment 39-5619, and AD 95-08-15, Amendment 39-9204.

Applicability: Pratt & Whitney (PW) Models JT8D-1,-1A,-1B, -7, -7A, -7B, -9, -9A, -11, -15, -15A, -17, -17A, -17R, and -17AR turbofan engines, with combustion chamber outer case (CCOC) part numbers (P/Ns) 490547, 542155, 616315, 728829, 728829-001, 730413, 730413-001, 730414, 730414-001, 767197, 767279, 767279-001 installed. These engines are installed on but not limited to Boeing 737 and 727 series, and McDonnell Douglas DC-9 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 CCOC flange cracks that could result in uncontained engine failure, inflight engine shutdown, engine cowl release, and airframe damage, accomplish the following:

(a) Inspect, disposition, and report CCOC distress, in accordance with the intervals and procedures described in Paragraphs 2.A and 2.C of PW Alert Service Bulletin (ASB) No. A6202, Revision 1, dated January 4, 1996. Reporting requirements have been approved by the Office of Management and Budget and assigned OMB control number 2120-0056.

(1) For the purposes of this AD, the accomplishment effective date to be used for determination of inspection intervals, as required by Section 2.A of PW ASB A6202, Revision 1, dated January 4, 1996, is defined as May 9, 1995, which is the effective date of AD 95-08-15.

(b) Inspect, disposition ,and report CCOC distress in accordance with the intervals and procedures described in Paragraphs 2.A. (Part I), 2.B. (Part II), and 2.D of PW ASB No. A6228, dated November 7, 1995. 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. 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 2: Information concerning the existence of approved alternative method 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 Secs. 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 ASBs:

Document No.        Pages     Revision       Date

A6202               1-10      1              Jan. 4, 1996.
                     11         Original       Feb. 20, 1995.
NDIP-835            1-17      A              Oct. 7, 1995.
Total pages: 28.
A6228               1-31      Original       Nov. 7, 1995.
NDIP-620            1-15      A              Oct. 7 1995.
NDIP-691            1-20      B              Oct. 7, 1995.
NDIP-781            1-21      Original       Oct. 7, 1995.
NDIP-795            1-20      Original       Oct. 7, 1995.
NDIP-829            1-14      Original       Oct. 7, 1995.
NDIP-834            1-19      A              Oct. 7, 1995.
NDIP-856            1-42      Original       Oct. 7, 1993.
    Total pages: 182.

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 January 2, 1997.

FOR FURTHER INFORMATION CONTACT:

Robert E. 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.