Airworthiness directives › 2020-06-01
AD 2020-06-01 Airworthiness Directives; CFM International, S.A., Turbofan Engines
Applicability*9
This AD applies to all CFM International S.A. (CFM) LEAP-1B21, -1B23, -1B25, -1B27, -1B28, -1B28B1, -1B28B2, -1B28B3, -1B28B2C, -1B28BBJ1, and -1B28BBJ2 model turbofan engines.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
Within 15 days after the effective date of this AD, revise the Airworthiness Limitations Section (ALS) of the applicable CFM LEAP-1B Engine Shop Manual and the operator's existing approved continuous airworthiness maintenance program by inserting the following changes: (1) Paragraph 6.B.(2) of the CFM Engine Shop Manual (ESM) Data Module LEAP-1B-05-21-03-01A-281B-C, Issue 002, dated January 9, 2020; and (2) Paragraphs 6.B.(1), 6.B.(2), and 6.C.(1) of the CFM ESM Data Module LEAP-1B-05-29-00-01A-281B-C, Issue 001, dated January 9, 2020.
Unsafe condition
(1) This AD was prompted by multiple reports of engine in-flight shutdowns (IFSDs) and defects in the related applicable systems and one report of a melt-related defect of the high-pressure turbine (HPT) stage 2 disk material. The FAA is issuing this AD to prevent: (i) Increased fuel flow through certain fuel nozzles leading to distress of the HPT static structures and IFSD of one or more engines; (ii) Undetected subsurface anomalies formed during the manufacturing process that could lead to uncontained HPT disk failure; (iii) Icing in the pressure sensor lines, inaccurate pressure sensor readings and loss of thrust control; and (iv) Inadequate oil flow to the radial drive shaft (RDS) bearing, failure of the bearing, and IFSD of one or more engines. (2) These unsafe conditions, if not addressed, could result in IFSD or failure of one or more engines, loss of thrust control and loss of the airplane.
Affected ADs
This AD replaces AD 2018-25-09, Amendment 39-19520 (83 FR 63559, December 11, 2018), and AD 2019-12-01, Amendment 39-19656 (84 FR 28202, June 18, 2019).
Read the original on the Federal Register →
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