Airworthiness directives › 2020-06-02
AD 2020-06-02 Airworthiness Directives; International Aero Engines, LLC Turbofan Engines
Applicability*9
This AD applies to International Aero Engines, LLC (IAE) PW1122G-JM, PW1124G1-JM, PW1124G-JM, PW1127GA-JM, PW1127G1-JM, PW1127G-JM, PW1133G-JM, PW1133GA-JM, PW1130G-JM, and PW1129G-JM model turbofan engines with low-pressure turbine (LPT) 3rd-stage blade, part number (P/N) 5387343, 5387493, 5387473 or 5387503, installed.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
(1) Perform a borescope inspection (BSI) of the turbine piston seal shiplap in accordance with the Accomplishment Instructions, For Engines Installed On Aircraft, paragraph B of Pratt & Whitney (P&W) Service Bulletin (SB) PW1000G-C-72-00-0154-00A-930A-D, Issue No. 004, dated February 14, 2020 (“P&W SB PW1000G-C-72-00-0154-00A-930A-D”), or the Accomplishment Instructions, For Engines Not Installed on Aircraft, paragraph A of P&W SB PW1000G-C-72-00-0154-00A-930A-D, as applicable, as follows: (i) For engines operating on extended operations (ETOPS) flights, perform the BSI of the turbine piston seal shiplap within 15 days after the effective date of this AD. (ii) For engines that do not operate on ETOPS flights, perform the BSI of the turbine piston seal shiplap within 45 days after the effective date of this AD. (iii) Before further flight, remove from service any turbine piston seal found to exceed serviceable limits, as described in the Accomplishment Instructions, For Engines Installed On Aircraft, paragraph C.(1) and C.(2), of P&W SB PW1000G-C-72-00-0154-00A-930A-D. (iv) If any turbine piston seal shiplap is found fractured and missing, before further flight, BSI the LPT 3rd-stage blades, and remove any LPT 3rd-stage blade found to exceed serviceable limits. Note 1 to paragraph (g)(1)(iv): Guidance on determining LPT 3rd-stage blade serviceable limits can be found in Airbus Aircraft Maintenance Manual (AMM) TASK 72-53-00-200-801-A. (2) Thereafter, repeat the BSI required by paragraph (g)(1) of the turbine piston seal as follows: (i) For any turbine piston seal found intact (not fractured) during the last BSI, repeat the BSI within the intervals in Table 2, of P&W SB PW1000G-C-72-00-0154-00A-930A-D. (ii) For any turbine piston seal found fractured during the last BSI, repeat the BSI every 200 flight cycles from the previous BSI to ensure proper engagement per the Accomplishment Instructions, For Engines Installed On Aircraft, paragraph C.(1) of P&W SB PW1000G-C-72-00-0154-00A-930A-D.
Unsafe condition
This AD was prompted by reports of failure of turbine stator intermediate outer rear air seals (turbine piston seals) leading to fracture of the LPT 3rd-stage blades. The FAA is issuing this AD to prevent failure of the turbine piston seals and fracture of LPT 3rd-stage blades. The unsafe condition, if not addressed, could result in failure of one or more engines, loss of thrust control, and loss of the airplane.
Affected ADs
None.
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