Airworthiness directives › 2020-07-02
AD 2020-07-02 Airworthiness Directives; Pratt & Whitney Turbofan Engines
Applicability*9
This AD applies to all Pratt & Whitney PW1519G, PW1521G, PW1521G-3, PW1521GA, PW1524G, PW1524G-3, PW1525G, and PW1525G-3 model turbofan engines.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
(1) Remove the electronic engine control (EEC) software if the version is earlier than full authority digital electronic control (FADEC) software version V2.11.9.2 and install EEC FADEC software that is eligible for installation, as follows: (i) For engines that have accumulated less than 300 flight cycles (FCs) since new or since the last engine shop visit, within 15 FCs after the effective date of this AD. (ii) For all other engines, within 90 days after the effective date of this AD. (2) After the effective date of this AD, do not install an engine listed in paragraph (c) of this AD on any aircraft unless you have replaced the EEC software required by paragraph (g)(1) of this AD. Note to paragraph (g) of this AD: The engines identified in paragraphs (g)(1)(i) and (2) of this AD include engines originally delivered to operators as spare engines that have been subsequently installed on an airplane.
Unsafe condition
This AD was prompted by reports of in-flight shutdowns due to failure of the low-pressure compressor (LPC) rotor 1 (R1) and by subsequent findings of cracked LPC R1s during inspections. The FAA is issuing this AD to prevent failure of the LPC R1. The unsafe condition, if not addressed, could result in uncontained release of the LPC R1, damage to the engine, damage to the airplane, and loss of control of the airplane.
Affected ADs
None.
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