Airworthiness directives › 2017-12-03
AD 2017-12-03 Airworthiness Directives; Pratt & Whitney Division Turbofan Engines
Applicability*9
This AD applies to 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.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
(1) For an engine with 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 at the next engine shop visit, or before December 1, 2018, whichever occurs first, or, replace the EEC with a part eligible for installation. (2) For an engine with an S/N not listed in Figure 1 to paragraph (g) of this AD, upgrade any EEC software standards earlier than SCN 5B/I at the next engine shop visit, or before July 1, 2024, whichever occurs first, or replace the EEC with a part eligible for installation. Figure 1 to Paragraph ( g )—Engine S/Ns 716402 727272 728741 727103 727280 728743 727134 727281 728748 727152 727282 728779 727158 727286 728785 727189 727287 728795 727202 727288 728806 727204 728709 728811 727231 728715 728812 727239 728716 728820 727240 728719 728824 727251 728720 728826 727252 728725 728827 727253 728726 728840 727257 728729 728864 727269 728730 728870
Unsafe condition
This AD was prompted by an unrecoverable engine in-flight shutdown (IFSD) after an ice crystal icing event. We are issuing this AD to prevent failure of the high-pressure turbine (HPT), rotor seizure, failure of one or more engines, loss of thrust control, and loss of the airplane.
Affected ADs
None.
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