Airworthiness directives › 2018-26-01
AD 2018-26-01 Airworthiness Directives; CFM International S.A. Turbofan Engines
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 turbofan 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) For a fan blade with less than or equal to 16,000 cycles since new (CSN), inspect prior to accumulating 17,000 CSN. (ii) For a fan blade with more than 16,000 and less than 20,000 CSN, inspect within 1,000 cycles but no later than 20,000 CSN. (iii) For a fan blade with 20,000 or more CSN, inspect before further flight. (iv) Thereafter, repeat this inspection no later than 1,600 cycles since the last inspection, or within 450 cycles after October 16, 2018, the effective date of AD 2018-18-01, whichever occurs later. (v) Use the Accomplishment Instructions, paragraphs 3.A.(3)(a) through (i), of CFM International Service Bulletin (SB) CFM56-7B S/B 72-1033, Revision 3, dated November 6, 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, 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)(v) 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 initial fan blade inspection requirement based on its ongoing root cause investigation of an April 2018 engine failure that resulted in one fatality. We are issuing this AD 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 2018-18-01, Amendment 39-19380 (83 FR 49272, October 1, 2018).
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