Airworthiness directives › 2018-14-10
AD 2018-14-10 Airworthiness Directives; Pratt & Whitney Division Turbofan
Applicability*9
This AD applies to: (1) All Pratt & Whitney Division (PW) PW2037, PW2037M, and PW2040 turbofan engines with electronic engine control (EEC), model number EEC104-40 or EEC104-60, installed, with an EEC software standard earlier than SCN 5B/I; and (2) All PW PW2037, PW2037M, and PW2040 turbofan engines with EEC, model number EEC104-1, with part numbers (P/Ns) 1B7484, 1B7486, 1B7984, or 1B7985, installed, with an EEC software standard earlier than SCN 27A.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
(1) For an engine with an EEC model number EEC104-40 or EEC104-60 and a serial number (S/N) listed in Figure 1 to paragraph (g) of this AD, upgrade any EEC software standards earlier than SCN 5B/I or replace the EEC with a part eligible for installation at the next engine shop visit, or before December 1, 2018, whichever occurs first. (2) For an engine with an EEC model number EEC104-40 or EEC104-60 and an S/N not listed in Figure 1 to paragraph (g) of this AD, upgrade any EEC software standards earlier than SCN 5B/I or replace the EEC with a part eligible for installation at the next engine shop visit, or before July 1, 2024, whichever occurs first. (3) For an engine with an EEC model number EEC104-1 with P/N 1B7484, 1B7486, 1B7984, or 1B7985, upgrade any EEC software standards earlier than SCN 27A or replace the EEC with a part eligible for installation at the next engine shop visit, or before July 1, 2024, whichever occurs first. ER24AU18.400
Unsafe condition
This AD was prompted by an unrecoverable engine in-flight shutdown after an ice crystal icing event. We are issuing this AD to prevent failure of the high-pressure turbine and rotor seizure. The unsafe condition, if not corrected, could result in failure of one or more engines, loss of thrust control, and loss of the airplane.
Affected ADs
This AD replaces AD 2017-12-03, Amendment 39-18918 (82 FR 27411, June 15, 2017).
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