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Airworthiness directives › 2018-18-01

AD 2018-18-01 Airworthiness Directives; CFM International S.A. Turbofan Engines

Superseded. This directive was replaced by AD 2018-26-01. Work to the current one.
2018-10-16
2018-10-01
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Engine
2018-26-01

Applicability*9

This AD applies to CFM International S.A.(CFM) CFM56-7B20, CFM56-7B22, CFM56-7B22/B1, CFM56-7B24, CFM56-7B24/B1, CFM56-7B26, CFM56-7B26/B2, CFM56-7B27, CFM56-7B27A, CFM56-7B26/B1, CFM56-7B27/B1, CFM56-7B27/B3, CFM56-7B20/2, CFM56-7B22/2, CFM56-7B24/2, CFM56-7B26/2, CFM56-7B27/2, CFM56-7B20/3, CFM56-7B22/3, CFM56-7B22/3B1, CFM56-7B24/3, CFM56-7B24/3B1, CFM56-7B26/3, CFM56-7B26/3B1, CFM56-7B26/3B2, CFM56-7B27/3, CFM56-7B27/3B1, CFM56-7B27/3B3, CFM56-7B27A/3, CFM56-7B26/3F, CFM56-7B26/3B2F, CFM56-7B27/3F, CFM56-7B27/3B1F, CFM56-7B20E, CFM56-7B22E, CFM56-7B22E/B1, CFM56-7B24E, CFM56-7B24E/B1, CFM56-7B26E, CFM56-7B26E/B1, CFM56-7B26E/B2, CFM56-7B27AE, CFM56-7B27E, CFM56-7B27E/B1, CFM56-7B27E/B3, CFM56-7B26E/F, CFM56-7B26E/B2F, CFM56-7B27E/F, and CFM56-7B27E/B1F engine models.

Compliance

Comply with this AD within the compliance times specified, unless already done.

Required actions

(1) Perform an ultrasonic inspection (USI) or eddy current inspection (ECI) of the concave and convex sides of the fan blade dovetail as follows: (i) Before further flight, perform an initial inspection of the fan blade using the criteria in Planning Information, either paragraph 1.C.(2)(a), 1.C.(2)(b), or 1.C.(2)(c), of CFM Service Bulletin (SB) CFM56-7B S/B 72-1033, Revision 2, dated July 27, 2018. (ii) For all fan blades not inspected in accordance with (g)(1)(i) of this AD, perform an initial inspection prior to accumulating 20,000 flight cycles on the fan blade or before further flight, whichever occurs later. (iii) Thereafter, repeat this inspection no later than 1,600 cycles since the last inspection or within 450 cycles after the effective date of this AD, whichever occurs later. (iv) Use the Accomplishment Instructions, paragraphs 3.A.(3)(a) through (i), of CFM SB CFM56-7B S/B 72-1033, Revision 2, dated July 27, 2018, to perform a USI or use the instructions in subtask 72-21-01-220-091, of task 72-21-01-200-001, from CFM CFM56-7B Engine Shop Manual (ESM), Revision 57, dated January 15, 2018, to perform an ECI. (2) If any unserviceable indication, as specified in the applicable service information in paragraph (g)(1)(iv) of this AD, is found during the inspections required by paragraph (g) of this AD, replace the fan blade before further flight with a part eligible for installation.

Unsafe condition

This AD was prompted by further analysis by the manufacturer that indicated a need to reduce the repetitive fan blade inspection interval based on ongoing root cause investigation of an April 2018 engine failure that resulted in one fatality. The FAA is issuing this AD to reduce the repetitive fan blade inspection interval to prevent failure of the fan blade. The unsafe condition, if not addressed, could result in failure of the fan blade, the engine inlet cowl disintegrating and debris penetrating the fuselage, causing a loss of pressurization, and prompting an emergency descent.

Affected ADs

This AD replaces AD 2018-10-11, Amendment 39-19286 (83 FR 22836, May 17, 2018).

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