Airworthiness directives › 2018-20-01
AD 2018-20-01 Airworthiness Directives; CFM International S.A. Turbofan Engines
Applicability*9
This AD applies to CFM International S.A. (CFM) LEAP-1B21, LEAP-1B23, LEAP-1B25, LEAP-1B27, LEAP-1B28, LEAP-1B28B1, LEAP-1B28B2, LEAP-1B28B2C, LEAP-1B28B3, LEAP-1B28BBJ1, and LEAP-1B28BBJ2 turbofan engines with a high-pressure turbine (HPT) stator case (HPT case), part number (P/N) 2541M81G01 installed, and with any HPT case serial number (S/N) listed in Table 1 or Table 2 of Planning Information, paragraph 3.A., of CFM Service Bulletin (SB) LEAP-1B-72-00-0193-01A-930A-D, Issue 003, dated November 5, 2018.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
(1) After the effective date of this AD, remove the affected HPT case from service no later than the number of cycles in service specified in Table 1 or Table 2 of Planning Information, paragraph 3.A., of CFM SB LEAP-1B-72-00-0193-01A-930A-D, Issue 003, dated November 5, 2018. (2) After removing the HPT case as required in paragraph (g)(1) of this AD, and before further flight, determine if the combustor diffuser nozzle (CDN) case, P/N 2548M30G01 to 2548M30G07, inclusive, and with any CDN case S/N listed in Table 1 or Table 2 of Planning Information, paragraph 3.A., of CFM SB LEAP-1B-72-00-0193-01A-930A-D, Issue 003, dated November 5, 2018, needs to be replaced as follows: (i) Inspect the HPT case forward flange outer diameter using the Accomplishment Instructions, paragraphs 5.B.(1), 5.B.(2), and 5.B.(4) of CFM SB LEAP-1B-72-00-0193-01A-930A-D, Issue 003, dated November 5, 2018. (ii) If, during the inspection required by paragraph (g)(2)(i) of this AD, you find an HPT case forward flange cracked across the full axial length of the outer diameter, remove the CDN case, P/N 2548M30G01 to 2548M30G07, inclusive, from service and, before further flight, replace with a part eligible for installation.
Unsafe condition
This AD was prompted by the discovery of a quality escape at a manufacturing facility involving unapproved welds on HPT cases. We are issuing this AD to prevent failure of the HPT case. The unsafe condition, if not addressed, could result in engine fire and damage to the airplane.
Affected ADs
None.
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