Airworthiness directives › 2018-25-09
AD 2018-25-09 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, -1B28B2C, -1B28B3, -1B28BBJ1, and -1B28BBJ2 turbofan engines.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
(1) Within 60 days after the effective date of this AD, remove electronic engine control (EEC) system operation (OPS) software, P/N 2628M86P10 or earlier; and engine health monitoring (EHM) software, P/N 2628M87P10 or earlier, from the engine and from service. (2) Before further flight after the removal of the EEC OPS and EHM software required by paragraph (g)(1) of this AD, install EEC OPS and EHM software that is eligible for installation.
Unsafe condition
This AD was prompted by aborted takeoffs on the similarly designed CFM LEAP-1A model turbofan engine after those engines did not advance to the desired takeoff fan speed due to icing in the pressure sensor line. While we have not received any reports of aborted takeoffs with the CFM LEAP-1B model engine, the unsafe condition is likely to exist because of similarities in design and instances of ice and moisture found in the pressure sense subsystem lines. We are issuing this AD to prevent icing in the pressure sensor lines and inaccurate pressure sensor readings. 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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