Airworthiness Directive · Amendment 39-14339 · Pratt & Whitney JT8D-200 Series Turbofan Engines
Pratt & Whitney JT8D-200 Series Turbofan Engines
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.
This amendment supersedes an existing airworthiness directive (AD) that applies to Pratt & Whitney (PW) JT8D-200 series turbofan engines. That AD currently requires installing and periodically inspecting individual or sets of certain part number (P/N) temperature indicators on the No. 4 and 5 bearing compartment scavenge oil tube and performance of any necessary corrective action. This AD requires installing and periodically inspecting two temperature indicators on all PW JT8D-200 series turbofan engines, including those incorporating high pressure turbine (HPT) containment hardware. This AD results from five uncontained HPT shaft failures. We are issuing this AD to prevent oil fires and the resulting fracture of the HPT shaft which can result in uncontained release of engine fragments; engine fire; in-flight engine shutdown; and possible airplane damage.
You are responsible for having the actions required by this AD performed within the compliance times specified unless the actions have already been done.
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.
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.
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.
The requirements for thermocouple installation are listed in Appendix B of PW ASB No. JT8D A5944, Revision 5, dated October 3, 2005.
To perform the on-wing diagnostics test, use Appendix C of PW ASB No. JT8D A5944, Revision 5, dated October 3, 2005.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
