Airworthiness Directive · Amendment 39-18918 · Fuel control turbine engines
Pratt & Whitney Division Turbofan Engines
Superseded. A later AD replaced this one: AD 2018-14-10. Comply with the one in force.
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.
We are adopting a new airworthiness directive (AD) for certain Pratt & Whitney Division (PW) PW2037, PW2037M, and PW2040 turbofan engines. This AD was prompted by an unrecoverable engine in-flight shutdown (IFSD) after an ice crystal icing event. This AD requires installing a software standard eligible for installation and precludes the use of electronic engine control (EEC) software standards earlier than SCN 5B/I. We are issuing this AD to correct the unsafe condition on these products.
(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.
| 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 |
After the effective date of this AD, do not install any software standard earlier than SCN 5B/I into any EEC model number EEC104-40 or EEC104-60.
For the purpose of this AD, an “engine shop visit” is the induction of an engine into the shop for maintenance involving the separation of pairs of major mating engine flanges, except that the separation of engine flanges solely for the purposes of transportation without subsequent engine maintenance does not constitute an engine shop visit.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
