Airworthiness directives › 2005-21-01
AD 2005-21-01 Airworthiness Directives; Pratt & Whitney JT8D-200 Series Turbofan Engines
Applicability*9
This AD applies to Pratt & Whitney (PW) JT8D-200 series turbofan engines. These engines are installed on, but not limited to, McDonnell Douglas MD-80 series and Boeing 727 series airplanes.
Compliance
You are responsible for having the actions required by this AD performed within the compliance times specified unless the actions have already been done. Installation of the Dual-Window Temperature Indicators (f) Install two dual-window temperature indicators on the No. 4 bearing compartment scavenge oil tubes of PW JT8D-200 series turbofan engines within 90 days after the effective date of this AD. (1) Use paragraph 1.A. of the Accomplishment Instructions of PW Alert Service Bulletin (ASB) No. JT8D A5944, Revision 5, dated October 3, 2005, to install the temperature indicators. (2) The use of part manufacturer approval (PMA)-equivalent temperature indicators, P/N 3641, made by Telatemp Corporation, is acceptable. Initial Visual Inspection of the Dual-Window Temperature Indicators (g) Perform initial visual inspection of the dual-window temperature indicators installed in paragraph (f) of this AD within 65 hours time-in-service (TIS) since installation. (h) If the color of any temperature indicator window has turned black, perform troubleshooting, diagnostic testing, and corrective action as required, using paragraph 1.B. of the Accomplishment Instructions of PW ASB No. JT8D A5944, Revision 5, dated October 3, 2005. (i) If any temperature indicators are missing: (1) If one temperature indicator is missing, inspect the remaining temperature indicator and perform troubleshooting, diagnostic testing, and corrective action as required, using Paragraph B.2. of the Accomplishment Instructions of PW ASB No. JT8D A5944, Revision 5, dated October 3, 2005. (2) If both temperature indicators are missing: (i) Perform troubleshooting, diagnostic testing, and corrective action as required, using Figure 2 of the Accomplishment Instructions of PW ASB No. JT8D A5944, Revision 5, dated October 3, 2005. (ii) Perform both engine diagnostic tests as specified in Figure 3 and Figure 4 of the Accomplishment Instructions of PW ASB No. JT8D 5944, Revision 5, dated October 3, 2005. (iii) If the engine fails the diagnostic tests for red indicators, do not perform the test for yellow indicators. Remove the engine from service. (3) If the test results show an oil overtemperature condition, remove the engine from service. (4) If the test results show no oil overtemperature condition: (i) Replace any temperature indicator that has turned black as specified in paragraph (h) of this AD; and (ii) Replace any temperature indicator that is missing as specified in paragraph (i) of this AD; and (iii) Return the engine to service, and inspect as specified in paragraph (g) of this AD. Repetitive Visual Inspection of the Dual-Window Temperature Indicators (j) Perform repetitive visual inspections of the dual-window temperature indicators installed in paragraph (f) of this AD within 65 hours TIS since-last-inspection. Use paragraph (h) of this AD to inspect the temperature indicators. Requirements for Thermocouple Installation for On-Wing Diagnostic Test (k) The requirements for thermocouple installation are listed in Appendix B of PW ASB No. JT8D A5944, Revision 5, dated October 3, 2005. On-Wing Diagnostic Test Information (l) To perform the on-wing diagnostics test, use Appendix C of PW ASB No. JT8D A5944, Revision 5, dated October 3, 2005. Material Incorporated by Reference (m) You must use Pratt & Whitney Alert Service Bulletin No. JT8D A5944, Revision 5, dated October 3, 2005, to perform the inspections and tests required by this AD. The Director of the Federal Register approved the incorporation by reference of this service bulletin in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. You can get a copy from Pratt & Whitney, 400 Main St., East Hartford, CT 06108; telephone (860) 565-7700, fax (860) 565-1605. You can review copies at the FAA, New England Region, Office of the Regional Counsel, 12 New England Executive Park, Burlington, MA; or at the National Archives and Records Administration (NARA). For information on the availability of this material at NARA, call 202-741-6030, or go to: http://www.archives.gov/federal-register/cfr/ibr-locations.html. Related Information (n) None. Issued in Burlington, Massachusetts, on October 3, 2005. Francis A. Favara, Acting Manager, Engine and Propeller Directorate, Aircraft Certification Service. [FR Doc. 05-20501 Filed 10-14-05; 8:45 am] BILLING CODE 4910-13-P
Unsafe condition
This AD results from five uncontained high pressure turbine (HPT) shaft failures out of thirteen HPT shaft fractures due to oil fires in the No. 4 and 5 bearing compartments. We are issuing this AD to prevent oil fires; fracture of the HPT shaft which can result in uncontained release of engine fragments; engine fire; in-flight engine shutdown; and possible airplane damage.
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